Merge pull request #2072 from mholt/acmev2

tls: Use ACMEv2 and support automatic wildcard certificates

caddy/caddymain/run.go

@@ -27,7 +27,7 @@ import (
 
 	"gopkg.in/natefinch/lumberjack.v2"
 
-	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/acmev2"
 
 	"github.com/mholt/caddy"
 	// plug in the HTTP server type
@@ -42,7 +42,7 @@ func init() {
 	setVersion()
 
 	flag.BoolVar(&caddytls.Agreed, "agree", false, "Agree to the CA's Subscriber Agreement")
-	flag.StringVar(&caddytls.DefaultCAUrl, "ca", "https://acme-v01.api.letsencrypt.org/directory", "URL to certificate authority's ACME server directory")
+	flag.StringVar(&caddytls.DefaultCAUrl, "ca", "https://acme-v02.api.letsencrypt.org/directory", "URL to certificate authority's ACME server directory")
 	flag.BoolVar(&caddytls.DisableHTTPChallenge, "disable-http-challenge", caddytls.DisableHTTPChallenge, "Disable the ACME HTTP challenge")
 	flag.BoolVar(&caddytls.DisableTLSSNIChallenge, "disable-tls-sni-challenge", caddytls.DisableTLSSNIChallenge, "Disable the ACME TLS-SNI challenge")
 	flag.StringVar(&conf, "conf", "", "Caddyfile to load (default \""+caddy.DefaultConfigFile+"\")")

caddyhttp/httpserver/https.go

@@ -100,8 +100,8 @@ func enableAutoHTTPS(configs []*SiteConfig, loadCertificates bool) error {
 		}
 		cfg.TLS.Enabled = true
 		cfg.Addr.Scheme = "https"
-		if loadCertificates && caddytls.HostQualifies(cfg.Addr.Host) {
-			_, err := cfg.TLS.CacheManagedCertificate(cfg.Addr.Host)
+		if loadCertificates && caddytls.HostQualifies(cfg.TLS.Hostname) {
+			_, err := cfg.TLS.CacheManagedCertificate(cfg.TLS.Hostname)
 			if err != nil {
 				return err
 			}

caddyhttp/httpserver/replacer.go

@@ -431,12 +431,26 @@ func (r *replacer) getSubstitution(key string) string {
 			return "UNKNOWN" // this should never happen, but guard in case
 		}
 		return r.emptyValue
+	default:
+		// {labelN}
+		if strings.HasPrefix(key, "{label") {
+			nStr := key[6 : len(key)-1] // get the integer N in "{labelN}"
+			n, err := strconv.Atoi(nStr)
+			if err != nil || n < 1 {
+				return r.emptyValue
+			}
+			labels := strings.Split(r.request.Host, ".")
+			if n > len(labels) {
+				return r.emptyValue
+			}
+			return labels[n-1]
+		}
 	}
 
 	return r.emptyValue
 }
 
-//convertToMilliseconds returns the number of milliseconds in the given duration
+// convertToMilliseconds returns the number of milliseconds in the given duration
 func convertToMilliseconds(d time.Duration) int64 {
 	return d.Nanoseconds() / 1e6
 }

caddyhttp/httpserver/replacer_test.go

@@ -53,7 +53,7 @@ func TestReplace(t *testing.T) {
 	recordRequest := NewResponseRecorder(w)
 	reader := strings.NewReader(`{"username": "dennis"}`)
 
-	request, err := http.NewRequest("POST", "http://localhost/?foo=bar", reader)
+	request, err := http.NewRequest("POST", "http://localhost.local/?foo=bar", reader)
 	if err != nil {
 		t.Fatalf("Failed to make request: %v", err)
 	}
@@ -87,7 +87,7 @@ func TestReplace(t *testing.T) {
 		expect   string
 	}{
 		{"This hostname is {hostname}", "This hostname is " + hostname},
-		{"This host is {host}.", "This host is localhost."},
+		{"This host is {host}.", "This host is localhost.local."},
 		{"This request method is {method}.", "This request method is POST."},
 		{"The response status is {status}.", "The response status is 200."},
 		{"{when}", "02/Jan/2006:15:04:05 +0000"},
@@ -97,7 +97,7 @@ func TestReplace(t *testing.T) {
 		{"The CustomAdd header is {>CustomAdd}.", "The CustomAdd header is caddy."},
 		{"The Custom response header is {<Custom}.", "The Custom response header is CustomResponseHeader."},
 		{"Bad {>Custom placeholder", "Bad {>Custom placeholder"},
-		{"The request is {request}.", "The request is POST /?foo=bar HTTP/1.1\\r\\nHost: localhost\\r\\n" +
+		{"The request is {request}.", "The request is POST /?foo=bar HTTP/1.1\\r\\nHost: localhost.local\\r\\n" +
 			"Cookie: foo=bar; taste=delicious\\r\\nCustom: foobarbaz\\r\\nCustomadd: caddy\\r\\n" +
 			"Shorterval: 1\\r\\n\\r\\n."},
 		{"The cUsToM header is {>cUsToM}...", "The cUsToM header is foobarbaz..."},
@@ -112,6 +112,8 @@ func TestReplace(t *testing.T) {
 		{"Query string is {query}", "Query string is foo=bar"},
 		{"Query string value for foo is {?foo}", "Query string value for foo is bar"},
 		{"Missing query string argument is {?missing}", "Missing query string argument is "},
+		{"{label1} {label2} {label3} {label4}", "localhost local - -"},
+		{"Label with missing number is {label} or {labelQQ}", "Label with missing number is - or -"},
 		{"\\{ 'hostname': '{hostname}' \\}", "{ 'hostname': '" + hostname + "' }"},
 	}
 

caddytls/client.go

@@ -26,7 +26,7 @@ import (
 	"time"
 
 	"github.com/mholt/caddy"
-	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/acmev2"
 )
 
 // acmeMu ensures that only one ACME challenge occurs at a time.
@@ -89,26 +89,21 @@ var newACMEClient = func(config *Config, allowPrompts bool) (*ACMEClient, error)
 	// If not registered, the user must register an account with the CA
 	// and agree to terms
 	if leUser.Registration == nil {
-		reg, err := client.Register()
-		if err != nil {
-			return nil, errors.New("registration error: " + err.Error())
-		}
-		leUser.Registration = reg
-
 		if allowPrompts { // can't prompt a user who isn't there
-			if !Agreed && reg.TosURL == "" {
-				Agreed = promptUserAgreement(saURL, false) // TODO - latest URL
+			termsURL := client.GetToSURL()
+			if !Agreed && termsURL != "" {
+				Agreed = askUserAgreement(client.GetToSURL())
 			}
-			if !Agreed && reg.TosURL == "" {
-				return nil, errors.New("user must agree to terms")
+			if !Agreed && termsURL != "" {
+				return nil, errors.New("user must agree to CA terms (use -agree flag)")
 			}
 		}
 
-		err = client.AgreeToTOS()
+		reg, err := client.Register(Agreed)
 		if err != nil {
-			saveUser(storage, leUser) // Might as well try, right?
-			return nil, errors.New("error agreeing to terms: " + err.Error())
+			return nil, errors.New("registration error: " + err.Error())
 		}
+		leUser.Registration = reg
 
 		// save user to the file system
 		err = saveUser(storage, leUser)
@@ -136,38 +131,57 @@ var newACMEClient = func(config *Config, allowPrompts bool) (*ACMEClient, error)
 			useHTTPPort = DefaultHTTPAlternatePort
 		}
 
+		// TODO: tls-sni challenge was removed in January 2018, but a variant of it might return
 		// See which port TLS-SNI challenges will be accomplished on
-		useTLSSNIPort := TLSSNIChallengePort
-		if config.AltTLSSNIPort != "" {
-			useTLSSNIPort = config.AltTLSSNIPort
-		}
-
+		// useTLSSNIPort := TLSSNIChallengePort
+		// if config.AltTLSSNIPort != "" {
+		// 	useTLSSNIPort = config.AltTLSSNIPort
+		// }
+		// err := c.acmeClient.SetTLSAddress(net.JoinHostPort(config.ListenHost, useTLSSNIPort))
+		// if err != nil {
+		// 	return nil, err
+		// }
+
+		// if using file storage, we can distribute the HTTP challenge across
+		// all instances sharing the acme folder; either way, we must still set
+		// the address for the default HTTP provider server
+		var useDistributedHTTPSolver bool
+		if storage, err := c.config.StorageFor(c.config.CAUrl); err == nil {
+			if _, ok := storage.(*FileStorage); ok {
+				useDistributedHTTPSolver = true
+			}
+		}
+		if useDistributedHTTPSolver {
+			c.acmeClient.SetChallengeProvider(acme.HTTP01, distributedHTTPSolver{
+				// being careful to respect user's listener bind preferences
+				httpProviderServer: acme.NewHTTPProviderServer(config.ListenHost, useHTTPPort),
+			})
+		} else {
 			// Always respect user's bind preferences by using config.ListenHost.
 			// NOTE(Sep'16): At time of writing, SetHTTPAddress() and SetTLSAddress()
-		// must be called before SetChallengeProvider(), since they reset the
-		// challenge provider back to the default one!
+			// must be called before SetChallengeProvider() (see above), since they reset
+			// the challenge provider back to the default one! (still true in March 2018)
 			err := c.acmeClient.SetHTTPAddress(net.JoinHostPort(config.ListenHost, useHTTPPort))
 			if err != nil {
 				return nil, err
 			}
-		err = c.acmeClient.SetTLSAddress(net.JoinHostPort(config.ListenHost, useTLSSNIPort))
-		if err != nil {
-			return nil, err
 		}
 
+		// TODO: tls-sni challenge was removed in January 2018, but a variant of it might return
 		// See if TLS challenge needs to be handled by our own facilities
-		if caddy.HasListenerWithAddress(net.JoinHostPort(config.ListenHost, useTLSSNIPort)) {
-			c.acmeClient.SetChallengeProvider(acme.TLSSNI01, tlsSNISolver{certCache: config.certCache})
-		}
+		// if caddy.HasListenerWithAddress(net.JoinHostPort(config.ListenHost, useTLSSNIPort)) {
+		// 	c.acmeClient.SetChallengeProvider(acme.TLSSNI01, tlsSNISolver{certCache: config.certCache})
+		// }
 
 		// Disable any challenges that should not be used
 		var disabledChallenges []acme.Challenge
 		if DisableHTTPChallenge {
 			disabledChallenges = append(disabledChallenges, acme.HTTP01)
 		}
-		if DisableTLSSNIChallenge {
-			disabledChallenges = append(disabledChallenges, acme.TLSSNI01)
-		}
+		// TODO: tls-sni challenge was removed in January 2018, but a variant of it might return
+		// if DisableTLSSNIChallenge {
+		// 	disabledChallenges = append(disabledChallenges, acme.TLSSNI01)
+		// }
 		if len(disabledChallenges) > 0 {
 			c.acmeClient.ExcludeChallenges(disabledChallenges)
 		}
@@ -188,7 +202,9 @@ var newACMEClient = func(config *Config, allowPrompts bool) (*ACMEClient, error)
 		}
 
 		// Use the DNS challenge exclusively
-		c.acmeClient.ExcludeChallenges([]acme.Challenge{acme.HTTP01, acme.TLSSNI01})
+		// TODO: tls-sni challenge was removed in January 2018, but a variant of it might return
+		// c.acmeClient.ExcludeChallenges([]acme.Challenge{acme.HTTP01, acme.TLSSNI01})
+		c.acmeClient.ExcludeChallenges([]acme.Challenge{acme.HTTP01})
 		c.acmeClient.SetChallengeProvider(acme.DNS01, prov)
 	}
 
@@ -221,7 +237,6 @@ func (c *ACMEClient) Obtain(name string) error {
 		}
 	}()
 
-Attempts:
 	for attempts := 0; attempts < 2; attempts++ {
 		namesObtaining.Add([]string{name})
 		acmeMu.Lock()
@@ -230,31 +245,15 @@ Attempts:
 		namesObtaining.Remove([]string{name})
 		if len(failures) > 0 {
 			// Error - try to fix it or report it to the user and abort
-			var errMsg string             // we'll combine all the failures into a single error message
-			var promptedForAgreement bool // only prompt user for agreement at most once
 
+			var errMsg string // combine all the failures into a single error message
 			for errDomain, obtainErr := range failures {
 				if obtainErr == nil {
 					continue
 				}
-				if tosErr, ok := obtainErr.(acme.TOSError); ok {
-					// Terms of Service agreement error; we can probably deal with this
-					if !Agreed && !promptedForAgreement && c.AllowPrompts {
-						Agreed = promptUserAgreement(tosErr.Detail, true) // TODO: Use latest URL
-						promptedForAgreement = true
-					}
-					if Agreed || !c.AllowPrompts {
-						err := c.acmeClient.AgreeToTOS()
-						if err != nil {
-							return errors.New("error agreeing to updated terms: " + err.Error())
-						}
-						continue Attempts
-					}
+				errMsg += fmt.Sprintf("[%s] failed to get certificate: %v\n", errDomain, obtainErr)
 			}
 
-				// If user did not agree or it was any other kind of error, just append to the list of errors
-				errMsg += "[" + errDomain + "] failed to get certificate: " + obtainErr.Error() + "\n"
-			}
 			return errors.New(errMsg)
 		}
 
@@ -316,19 +315,9 @@ func (c *ACMEClient) Renew(name string) error {
 			break
 		}
 
-		// If the legal terms were updated and need to be
-		// agreed to again, we can handle that.
-		if _, ok := err.(acme.TOSError); ok {
-			err := c.acmeClient.AgreeToTOS()
-			if err != nil {
-				return err
-			}
-			continue
-		}
-
-		// For any other kind of error, wait 10s and try again.
+		// wait a little bit and try again
 		wait := 10 * time.Second
-		log.Printf("[ERROR] Renewing: %v; trying again in %s", err, wait)
+		log.Printf("[ERROR] Renewing [%v]: %v; trying again in %s", name, err, wait)
 		time.Sleep(wait)
 	}
 

caddytls/config.go

@@ -25,7 +25,7 @@ import (
 
 	"github.com/codahale/aesnicheck"
 	"github.com/mholt/caddy"
-	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/acmev2"
 )
 
 // Config describes how TLS should be configured and used.
@@ -190,10 +190,15 @@ func NewConfig(inst *caddy.Instance) *Config {
 // it does not load them into memory. If allowPrompts is true,
 // the user may be shown a prompt.
 func (c *Config) ObtainCert(name string, allowPrompts bool) error {
-	if !c.Managed || !HostQualifies(name) {
+	skip, err := c.preObtainOrRenewChecks(name, allowPrompts)
+	if err != nil {
+		return err
+	}
+	if skip {
 		return nil
 	}
 
+	// we expect this to be a new (non-existent) site
 	storage, err := c.StorageFor(c.CAUrl)
 	if err != nil {
 		return err
@@ -205,9 +210,6 @@ func (c *Config) ObtainCert(name string, allowPrompts bool) error {
 	if siteExists {
 		return nil
 	}
-	if c.ACMEEmail == "" {
-		c.ACMEEmail = getEmail(storage, allowPrompts)
-	}
 
 	client, err := newACMEClient(c, allowPrompts)
 	if err != nil {
@@ -219,6 +221,14 @@ func (c *Config) ObtainCert(name string, allowPrompts bool) error {
 // RenewCert renews the certificate for name using c. It stows the
 // renewed certificate and its assets in storage if successful.
 func (c *Config) RenewCert(name string, allowPrompts bool) error {
+	skip, err := c.preObtainOrRenewChecks(name, allowPrompts)
+	if err != nil {
+		return err
+	}
+	if skip {
+		return nil
+	}
+
 	client, err := newACMEClient(c, allowPrompts)
 	if err != nil {
 		return err
@@ -226,6 +236,33 @@ func (c *Config) RenewCert(name string, allowPrompts bool) error {
 	return client.Renew(name)
 }
 
+// preObtainOrRenewChecks perform a few simple checks before
+// obtaining or renewing a certificate with ACME, and returns
+// whether this name should be skipped (like if it's not
+// managed TLS) as well as any error. It ensures that the
+// config is Managed, that the name qualifies for a certificate,
+// and that an email address is available.
+func (c *Config) preObtainOrRenewChecks(name string, allowPrompts bool) (bool, error) {
+	if !c.Managed || !HostQualifies(name) {
+		return true, nil
+	}
+
+	// wildcard certificates require DNS challenge (as of March 2018)
+	if strings.Contains(name, "*") && c.DNSProvider == "" {
+		return false, fmt.Errorf("wildcard domain name (%s) requires DNS challenge; use dns subdirective to configure it", name)
+	}
+
+	if c.ACMEEmail == "" {
+		var err error
+		c.ACMEEmail, err = getEmail(c, allowPrompts)
+		if err != nil {
+			return false, err
+		}
+	}
+
+	return false, nil
+}
+
 // StorageFor obtains a TLS Storage instance for the given CA URL which should
 // be unique for every different ACME CA. If a StorageCreator is set on this
 // Config, it will be used. Otherwise the default file storage implementation

caddytls/crypto.go

@@ -42,7 +42,7 @@ import (
 	"golang.org/x/crypto/ocsp"
 
 	"github.com/mholt/caddy"
-	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/acmev2"
 )
 
 // loadPrivateKey loads a PEM-encoded ECC/RSA private key from an array of bytes.
@@ -107,7 +107,8 @@ func stapleOCSP(cert *Certificate, pemBundle []byte) error {
 	// TODO: Use Storage interface instead of disk directly
 	var ocspFileNamePrefix string
 	if len(cert.Names) > 0 {
-		ocspFileNamePrefix = cert.Names[0] + "-"
+		firstName := strings.Replace(cert.Names[0], "*", "wildcard_", -1)
+		ocspFileNamePrefix = firstName + "-"
 	}
 	ocspFileName := ocspFileNamePrefix + fastHash(pemBundle)
 	ocspCachePath := filepath.Join(ocspFolder, ocspFileName)

caddytls/filestorage.go

@@ -30,14 +30,14 @@ func init() {
 	RegisterStorageProvider("file", NewFileStorage)
 }
 
-// storageBasePath is the root path in which all TLS/ACME assets are
-// stored. Do not change this value during the lifetime of the program.
-var storageBasePath = filepath.Join(caddy.AssetsPath(), "acme")
-
 // NewFileStorage is a StorageConstructor function that creates a new
 // Storage instance backed by the local disk. The resulting Storage
 // instance is guaranteed to be non-nil if there is no error.
 func NewFileStorage(caURL *url.URL) (Storage, error) {
+	// storageBasePath is the root path in which all TLS/ACME assets are
+	// stored. Do not change this value during the lifetime of the program.
+	storageBasePath := filepath.Join(caddy.AssetsPath(), "acme")
+
 	storage := &FileStorage{Path: filepath.Join(storageBasePath, caURL.Host)}
 	storage.Locker = &fileStorageLock{caURL: caURL.Host, storage: storage}
 	return storage, nil
@@ -58,24 +58,29 @@ func (s *FileStorage) sites() string {
 
 // site returns the path to the folder containing assets for domain.
 func (s *FileStorage) site(domain string) string {
+	// Windows doesn't allow * in filenames, sigh...
+	domain = strings.Replace(domain, "*", "wildcard_", -1)
 	domain = strings.ToLower(domain)
 	return filepath.Join(s.sites(), domain)
 }
 
 // siteCertFile returns the path to the certificate file for domain.
 func (s *FileStorage) siteCertFile(domain string) string {
+	domain = strings.Replace(domain, "*", "wildcard_", -1)
 	domain = strings.ToLower(domain)
 	return filepath.Join(s.site(domain), domain+".crt")
 }
 
 // siteKeyFile returns the path to domain's private key file.
 func (s *FileStorage) siteKeyFile(domain string) string {
+	domain = strings.Replace(domain, "*", "wildcard_", -1)
 	domain = strings.ToLower(domain)
 	return filepath.Join(s.site(domain), domain+".key")
 }
 
 // siteMetaFile returns the path to the domain's asset metadata file.
 func (s *FileStorage) siteMetaFile(domain string) string {
+	domain = strings.Replace(domain, "*", "wildcard_", -1)
 	domain = strings.ToLower(domain)
 	return filepath.Join(s.site(domain), domain+".json")
 }

caddytls/httphandler.go

@@ -16,12 +16,16 @@ package caddytls
 
 import (
 	"crypto/tls"
+	"encoding/json"
 	"fmt"
 	"log"
 	"net/http"
 	"net/http/httputil"
 	"net/url"
+	"os"
 	"strings"
+
+	"github.com/xenolf/lego/acmev2"
 )
 
 const challengeBasePath = "/.well-known/acme-challenge"
@@ -38,6 +42,13 @@ func HTTPChallengeHandler(w http.ResponseWriter, r *http.Request, listenHost str
 	if DisableHTTPChallenge {
 		return false
 	}
+
+	// see if another instance started the HTTP challenge for this name
+	if tryDistributedChallengeSolver(w, r) {
+		return true
+	}
+
+	// otherwise, if we aren't getting the name, then ignore this challenge
 	if !namesObtaining.Has(r.Host) {
 		return false
 	}
@@ -70,3 +81,40 @@ func HTTPChallengeHandler(w http.ResponseWriter, r *http.Request, listenHost str
 
 	return true
 }
+
+// tryDistributedChallengeSolver checks to see if this challenge
+// request was initiated by another instance that shares file
+// storage, and attempts to complete the challenge for it. It
+// returns true if the challenge was handled; false otherwise.
+func tryDistributedChallengeSolver(w http.ResponseWriter, r *http.Request) bool {
+	filePath := distributedHTTPSolver{}.challengeTokensPath(r.Host)
+	f, err := os.Open(filePath)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			log.Printf("[ERROR][%s] Opening distributed challenge token file: %v", r.Host, err)
+		}
+		return false
+	}
+	defer f.Close()
+
+	var chalInfo challengeInfo
+	err = json.NewDecoder(f).Decode(&chalInfo)
+	if err != nil {
+		log.Printf("[ERROR][%s] Decoding challenge token file %s (corrupted?): %v", r.Host, filePath, err)
+		return false
+	}
+
+	// this part borrowed from xenolf/lego's built-in HTTP-01 challenge solver (March 2018)
+	challengeReqPath := acme.HTTP01ChallengePath(chalInfo.Token)
+	if r.URL.Path == challengeReqPath &&
+		strings.HasPrefix(r.Host, chalInfo.Domain) &&
+		r.Method == "GET" {
+		w.Header().Add("Content-Type", "text/plain")
+		w.Write([]byte(chalInfo.KeyAuth))
+		r.Close = true
+		log.Printf("[INFO][%s] Served key authentication", chalInfo.Domain)
+		return true
+	}
+
+	return false
+}

caddytls/setup.go

@@ -207,8 +207,21 @@ func setupTLS(c *caddy.Controller) error {
 				}
 			case "must_staple":
 				config.MustStaple = true
+			case "wildcard":
+				if !HostQualifies(config.Hostname) {
+					return c.Errf("Hostname '%s' does not qualify for managed TLS, so cannot manage wildcard certificate for it", config.Hostname)
+				}
+				if strings.Contains(config.Hostname, "*") {
+					return c.Errf("Cannot convert domain name '%s' to a valid wildcard: already has a wildcard label", config.Hostname)
+				}
+				parts := strings.Split(config.Hostname, ".")
+				if len(parts) < 3 {
+					return c.Errf("Cannot convert domain name '%s' to a valid wildcard: too few labels", config.Hostname)
+				}
+				parts[0] = "*"
+				config.Hostname = strings.Join(parts, ".")
 			default:
-				return c.Errf("Unknown keyword '%s'", c.Val())
+				return c.Errf("Unknown subdirective '%s'", c.Val())
 			}
 		}
 

caddytls/setup_test.go

@@ -22,7 +22,7 @@ import (
 	"testing"
 
 	"github.com/mholt/caddy"
-	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/acmev2"
 )
 
 func TestMain(m *testing.M) {

caddytls/tls.go

@@ -30,26 +30,35 @@ package caddytls
 
 import (
 	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
 	"net"
+	"os"
+	"path/filepath"
 	"strings"
 
 	"github.com/mholt/caddy"
-	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/acmev2"
 )
 
 // HostQualifies returns true if the hostname alone
-// appears eligible for automatic HTTPS. For example,
+// appears eligible for automatic HTTPS. For example:
 // localhost, empty hostname, and IP addresses are
 // not eligible because we cannot obtain certificates
-// for those names.
+// for those names. Wildcard names are allowed, as long
+// as they conform to CABF requirements (only one wildcard
+// label, and it must be the left-most label).
 func HostQualifies(hostname string) bool {
 	return hostname != "localhost" && // localhost is ineligible
 
 		// hostname must not be empty
 		strings.TrimSpace(hostname) != "" &&
 
-		// must not contain wildcard (*) characters (until CA supports it)
-		!strings.Contains(hostname, "*") &&
+		// only one wildcard label allowed, and it must be left-most
+		(!strings.Contains(hostname, "*") ||
+			(strings.Count(hostname, "*") == 1 &&
+				strings.HasPrefix(hostname, "*."))) &&
 
 		// must not start or end with a dot
 		!strings.HasPrefix(hostname, ".") &&
@@ -88,39 +97,125 @@ func Revoke(host string) error {
 	return client.Revoke(host)
 }
 
-// tlsSNISolver is a type that can solve TLS-SNI challenges using
-// an existing listener and our custom, in-memory certificate cache.
-type tlsSNISolver struct {
-	certCache *certificateCache
+// TODO: tls-sni challenge was removed in January 2018, but a variant of it might return
+// // tlsSNISolver is a type that can solve TLS-SNI challenges using
+// // an existing listener and our custom, in-memory certificate cache.
+// type tlsSNISolver struct {
+// 	certCache *certificateCache
+// }
+
+// // Present adds the challenge certificate to the cache.
+// func (s tlsSNISolver) Present(domain, token, keyAuth string) error {
+// 	cert, acmeDomain, err := acme.TLSSNI01ChallengeCert(keyAuth)
+// 	if err != nil {
+// 		return err
+// 	}
+// 	certHash := hashCertificateChain(cert.Certificate)
+// 	s.certCache.Lock()
+// 	s.certCache.cache[acmeDomain] = Certificate{
+// 		Certificate: cert,
+// 		Names:       []string{acmeDomain},
+// 		Hash:        certHash, // perhaps not necesssary
+// 	}
+// 	s.certCache.Unlock()
+// 	return nil
+// }
+
+// // CleanUp removes the challenge certificate from the cache.
+// func (s tlsSNISolver) CleanUp(domain, token, keyAuth string) error {
+// 	_, acmeDomain, err := acme.TLSSNI01ChallengeCert(keyAuth)
+// 	if err != nil {
+// 		return err
+// 	}
+// 	s.certCache.Lock()
+// 	delete(s.certCache.cache, acmeDomain)
+// 	s.certCache.Unlock()
+// 	return nil
+// }
+
+// distributedHTTPSolver allows the HTTP-01 challenge to be solved by
+// an instance other than the one which initiated it. This is useful
+// behind load balancers or in other cluster/fleet configurations.
+// The only requirement is that this (the initiating) instance share
+// the $CADDYPATH/acme folder with the instance that will complete
+// the challenge. Mounting the folder locally should be sufficient.
+//
+// Obviously, the instance which completes the challenge must be
+// serving on the HTTPChallengePort to receive and handle the request.
+// The HTTP server which receives it must check if a file exists, e.g.:
+// $CADDYPATH/acme/challenge_tokens/example.com.json, and if so,
+// decode it and use it to serve up the correct response. Caddy's HTTP
+// server does this by default.
+//
+// So as long as the folder is shared, this will just work. There are
+// no other requirements. The instances may be on other machines or
+// even other networks, as long as they share the folder as part of
+// the local file system.
+//
+// This solver works by persisting the token and keyauth information
+// to disk in the shared folder when the authorization is presented,
+// and then deletes it when it is cleaned up.
+type distributedHTTPSolver struct {
+	// The distributed HTTPS solver only works if an instance (either
+	// this one or another one) is already listening and serving on the
+	// HTTPChallengePort. If not -- for example: if this is the only
+	// instance, and it is just starting up and hasn't started serving
+	// yet -- then we still need a listener open with an HTTP server
+	// to handle the challenge request. Set this field to have the
+	// standard HTTPProviderServer open its listener for the duration
+	// of the challenge. Make sure to configure its listen address
+	// correctly.
+	httpProviderServer *acme.HTTPProviderServer
+}
+
+type challengeInfo struct {
+	Domain, Token, KeyAuth string
 }
 
 // Present adds the challenge certificate to the cache.
-func (s tlsSNISolver) Present(domain, token, keyAuth string) error {
-	cert, acmeDomain, err := acme.TLSSNI01ChallengeCert(keyAuth)
+func (dhs distributedHTTPSolver) Present(domain, token, keyAuth string) error {
+	if dhs.httpProviderServer != nil {
+		err := dhs.httpProviderServer.Present(domain, token, keyAuth)
+		if err != nil {
+			return fmt.Errorf("presenting with standard HTTP provider server: %v", err)
+		}
+	}
+
+	err := os.MkdirAll(dhs.challengeTokensBasePath(), 0755)
 	if err != nil {
 		return err
 	}
-	certHash := hashCertificateChain(cert.Certificate)
-	s.certCache.Lock()
-	s.certCache.cache[acmeDomain] = Certificate{
-		Certificate: cert,
-		Names:       []string{acmeDomain},
-		Hash:        certHash, // perhaps not necesssary
+
+	infoBytes, err := json.Marshal(challengeInfo{
+		Domain:  domain,
+		Token:   token,
+		KeyAuth: keyAuth,
+	})
+	if err != nil {
+		return err
 	}
-	s.certCache.Unlock()
-	return nil
+
+	return ioutil.WriteFile(dhs.challengeTokensPath(domain), infoBytes, 0644)
 }
 
 // CleanUp removes the challenge certificate from the cache.
-func (s tlsSNISolver) CleanUp(domain, token, keyAuth string) error {
-	_, acmeDomain, err := acme.TLSSNI01ChallengeCert(keyAuth)
+func (dhs distributedHTTPSolver) CleanUp(domain, token, keyAuth string) error {
+	if dhs.httpProviderServer != nil {
+		err := dhs.httpProviderServer.CleanUp(domain, token, keyAuth)
 		if err != nil {
-		return err
+			log.Printf("[ERROR] Cleaning up standard HTTP provider server: %v", err)
 		}
-	s.certCache.Lock()
-	delete(s.certCache.cache, acmeDomain)
-	s.certCache.Unlock()
-	return nil
+	}
+	return os.Remove(dhs.challengeTokensPath(domain))
+}
+
+func (dhs distributedHTTPSolver) challengeTokensPath(domain string) string {
+	domainFile := strings.Replace(strings.ToLower(domain), "*", "wildcard_", -1)
+	return filepath.Join(dhs.challengeTokensBasePath(), domainFile+".json")
+}
+
+func (dhs distributedHTTPSolver) challengeTokensBasePath() string {
+	return filepath.Join(caddy.AssetsPath(), "acme", "challenge_tokens")
 }
 
 // ConfigHolder is any type that has a Config; it presumably is

caddytls/tls_test.go

@@ -18,7 +18,7 @@ import (
 	"os"
 	"testing"
 
-	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/acmev2"
 )
 
 func TestHostQualifies(t *testing.T) {
@@ -37,7 +37,10 @@ func TestHostQualifies(t *testing.T) {
 		{"0.0.0.0", false},
 		{"", false},
 		{" ", false},
-		{"*.example.com", false},
+		{"*.example.com", true},
+		{"*.*.example.com", false},
+		{"sub.*.example.com", false},
+		{"*sub.example.com", false},
 		{".com", false},
 		{"example.com.", false},
 		{"localhost", false},
@@ -77,7 +80,10 @@ func TestQualifiesForManagedTLS(t *testing.T) {
 		{holder{host: "localhost", cfg: new(Config)}, false},
 		{holder{host: "123.44.3.21", cfg: new(Config)}, false},
 		{holder{host: "example.com", cfg: new(Config)}, true},
-		{holder{host: "*.example.com", cfg: new(Config)}, false},
+		{holder{host: "*.example.com", cfg: new(Config)}, true},
+		{holder{host: "*.*.example.com", cfg: new(Config)}, false},
+		{holder{host: "*sub.example.com", cfg: new(Config)}, false},
+		{holder{host: "sub.*.example.com", cfg: new(Config)}, false},
 		{holder{host: "example.com", cfg: &Config{Manual: true}}, false},
 		{holder{host: "example.com", cfg: &Config{ACMEEmail: "off"}}, false},
 		{holder{host: "example.com", cfg: &Config{ACMEEmail: "foo@bar.com"}}, true},

caddytls/user.go

@@ -27,7 +27,7 @@ import (
 	"os"
 	"strings"
 
-	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/acmev2"
 )
 
 // User represents a Let's Encrypt user account.
@@ -67,43 +67,82 @@ func newUser(email string) (User, error) {
 	return user, nil
 }
 
-// getEmail does everything it can to obtain an email
-// address from the user within the scope of storage
-// to use for ACME TLS. If it cannot get an email
-// address, it returns empty string. (It will warn the
-// user of the consequences of an empty email.) This
-// function MAY prompt the user for input. If userPresent
-// is false, the operator will NOT be prompted and an
-// empty email may be returned.
-func getEmail(storage Storage, userPresent bool) string {
+// getEmail does everything it can to obtain an email address
+// from the user within the scope of memory and storage to use
+// for ACME TLS. If it cannot get an email address, it returns
+// empty string. (If user is present, it will warn the user of
+// the consequences of an empty email.) This function MAY prompt
+// the user for input. If userPresent is false, the operator
+// will NOT be prompted and an empty email may be returned.
+// If the user is prompted, a new User will be created and
+// stored in storage according to the email address they
+// provided (which might be blank).
+func getEmail(cfg *Config, userPresent bool) (string, error) {
+	storage, err := cfg.StorageFor(cfg.CAUrl)
+	if err != nil {
+		return "", err
+	}
+
 	// First try memory (command line flag or typed by user previously)
 	leEmail := DefaultEmail
+
+	// Then try to get most recent user email from storage
 	if leEmail == "" {
-		// Then try to get most recent user email
 		leEmail = storage.MostRecentUserEmail()
-		// Save for next time
-		DefaultEmail = leEmail
+		DefaultEmail = leEmail // save for next time
 	}
+
+	// Looks like there is no email address readily available,
+	// so we will have to ask the user if we can.
 	if leEmail == "" && userPresent {
-		// Alas, we must bother the user and ask for an email address;
-		// if they proceed they also agree to the SA.
+		// evidently, no User data was present in storage;
+		// thus we must make a new User so that we can get
+		// the Terms of Service URL via our ACME client, phew!
+		user, err := newUser("")
+		if err != nil {
+			return "", err
+		}
+
+		// get the agreement URL
+		agreementURL := agreementTestURL
+		if agreementURL == "" {
+			// we call acme.NewClient directly because newACMEClient
+			// would require that we already know the user's email
+			caURL := DefaultCAUrl
+			if cfg.CAUrl != "" {
+				caURL = cfg.CAUrl
+			}
+			tempClient, err := acme.NewClient(caURL, user, "")
+			if err != nil {
+				return "", fmt.Errorf("making ACME client to get ToS URL: %v", err)
+			}
+			agreementURL = tempClient.GetToSURL()
+		}
+
+		// prompt the user for an email address and terms agreement
 		reader := bufio.NewReader(stdin)
-		fmt.Println("\nYour sites will be served over HTTPS automatically using Let's Encrypt.")
-		fmt.Println("By continuing, you agree to the Let's Encrypt Subscriber Agreement at:")
-		fmt.Println("  " + saURL) // TODO: Show current SA link
-		fmt.Println("Please enter your email address so you can recover your account if needed.")
-		fmt.Println("You can leave it blank, but you'll lose the ability to recover your account.")
-		fmt.Print("Email address: ")
-		var err error
+		promptUserAgreement(agreementURL)
+		fmt.Println("Please enter your email address to signify agreement and to be notified")
+		fmt.Println("in case of issues. You can leave it blank, but we don't recommend it.")
+		fmt.Print("  Email address: ")
 		leEmail, err = reader.ReadString('\n')
-		if err != nil {
-			return ""
+		if err != nil && err != io.EOF {
+			return "", fmt.Errorf("reading email address: %v", err)
 		}
 		leEmail = strings.TrimSpace(leEmail)
 		DefaultEmail = leEmail
 		Agreed = true
+
+		// save the new user to preserve this for next time
+		user.Email = leEmail
+		err = saveUser(storage, user)
+		if err != nil {
+			return "", err
+		}
 	}
-	return strings.ToLower(leEmail)
+
+	// lower-casing the email is important for consistency
+	return strings.ToLower(leEmail), nil
 }
 
 // getUser loads the user with the given email from disk
@@ -154,18 +193,21 @@ func saveUser(storage Storage, user User) error {
 	return err
 }
 
-// promptUserAgreement prompts the user to agree to the agreement
-// at agreementURL via stdin. If the agreement has changed, then pass
-// true as the second argument. If this is the user's first time
-// agreeing, pass false. It returns whether the user agreed or not.
-func promptUserAgreement(agreementURL string, changed bool) bool {
-	if changed {
-		fmt.Printf("The Let's Encrypt Subscriber Agreement has changed:\n  %s\n", agreementURL)
-		fmt.Print("Do you agree to the new terms? (y/n): ")
-	} else {
-		fmt.Printf("To continue, you must agree to the Let's Encrypt Subscriber Agreement:\n  %s\n", agreementURL)
+// promptUserAgreement simply outputs the standard user
+// agreement prompt with the given agreement URL.
+// It outputs a newline after the message.
+func promptUserAgreement(agreementURL string) {
+	const userAgreementPrompt = `Your sites will be served over HTTPS automatically using Let's Encrypt.
+By continuing, you agree to the Let's Encrypt Subscriber Agreement at:`
+	fmt.Printf("\n\n%s\n  %s\n", userAgreementPrompt, agreementURL)
+}
+
+// askUserAgreement prompts the user to agree to the agreement
+// at the given agreement URL via stdin. It returns whether the
+// user agreed or not.
+func askUserAgreement(agreementURL string) bool {
+	promptUserAgreement(agreementURL)
 	fmt.Print("Do you agree to the terms? (y/n): ")
-	}
 
 	reader := bufio.NewReader(stdin)
 	answer, err := reader.ReadString('\n')
@@ -177,14 +219,15 @@ func promptUserAgreement(agreementURL string, changed bool) bool {
 	return answer == "y" || answer == "yes"
 }
 
+// agreementTestURL is set during tests to skip requiring
+// setting up an entire ACME CA endpoint.
+var agreementTestURL string
+
 // stdin is used to read the user's input if prompted;
 // this is changed by tests during tests.
 var stdin = io.ReadWriter(os.Stdin)
 
 // The name of the folder for accounts where the email
-// address was not provided; default 'username' if you will.
+// address was not provided; default 'username' if you will,
+// but only for local/storage use, not with the CA.
 const emptyEmail = "default"
-
-// TODO: After Boulder implements the 'meta' field of the directory,
-// we can get this link dynamically.
-const saURL = "https://acme-v01.api.letsencrypt.org/terms"

caddytls/user_test.go

@@ -20,13 +20,14 @@ import (
 	"crypto/elliptic"
 	"crypto/rand"
 	"io"
+	"path/filepath"
 	"strings"
 	"testing"
 	"time"
 
 	"os"
 
-	"github.com/xenolf/lego/acme"
+	"github.com/xenolf/lego/acmev2"
 )
 
 func TestUser(t *testing.T) {
@@ -135,7 +136,13 @@ func TestGetUserAlreadyExists(t *testing.T) {
 }
 
 func TestGetEmail(t *testing.T) {
-	storageBasePath = testStorage.Path // to contain calls that create a new Storage...
+	// ensure storage (via StorageFor) uses the local testdata folder that we delete later
+	origCaddypath := os.Getenv("CADDYPATH")
+	os.Setenv("CADDYPATH", "./testdata")
+	defer os.Setenv("CADDYPATH", origCaddypath)
+
+	agreementTestURL = "(none - testing)"
+	defer func() { agreementTestURL = "" }()
 
 	// let's not clutter up the output
 	origStdout := os.Stdout
@@ -146,7 +153,10 @@ func TestGetEmail(t *testing.T) {
 	DefaultEmail = "test2@foo.com"
 
 	// Test1: Use default email from flag (or user previously typing it)
-	actual := getEmail(testStorage, true)
+	actual, err := getEmail(testConfig, true)
+	if err != nil {
+		t.Fatalf("getEmail (1) error: %v", err)
+	}
 	if actual != DefaultEmail {
 		t.Errorf("Did not get correct email from memory; expected '%s' but got '%s'", DefaultEmail, actual)
 	}
@@ -154,16 +164,19 @@ func TestGetEmail(t *testing.T) {
 	// Test2: Get input from user
 	DefaultEmail = ""
 	stdin = new(bytes.Buffer)
-	_, err := io.Copy(stdin, strings.NewReader("test3@foo.com\n"))
+	_, err = io.Copy(stdin, strings.NewReader("test3@foo.com\n"))
 	if err != nil {
 		t.Fatalf("Could not simulate user input, error: %v", err)
 	}
-	actual = getEmail(testStorage, true)
+	actual, err = getEmail(testConfig, true)
+	if err != nil {
+		t.Fatalf("getEmail (2) error: %v", err)
+	}
 	if actual != "test3@foo.com" {
 		t.Errorf("Did not get correct email from user input prompt; expected '%s' but got '%s'", "test3@foo.com", actual)
 	}
 
-	// Test3: Get most recent email from before
+	// Test3: Get most recent email from before (in storage)
 	DefaultEmail = ""
 	for i, eml := range []string{
 		"TEST4-3@foo.com", // test case insensitivity
@@ -189,14 +202,20 @@ func TestGetEmail(t *testing.T) {
 			t.Fatalf("Could not change user folder mod time for '%s': %v", eml, err)
 		}
 	}
-	actual = getEmail(testStorage, true)
+	actual, err = getEmail(testConfig, true)
+	if err != nil {
+		t.Fatalf("getEmail (3) error: %v", err)
+	}
 	if actual != "test4-3@foo.com" {
 		t.Errorf("Did not get correct email from storage; expected '%s' but got '%s'", "test4-3@foo.com", actual)
 	}
 }
 
-var testStorage = &FileStorage{Path: "./testdata"}
+var (
+	testStorageBase = "./testdata" // ephemeral folder that gets deleted after tests finish
+	testCAHost      = "localhost"
+	testConfig      = &Config{CAUrl: "http://" + testCAHost + "/directory", StorageProvider: "file"}
+	testStorage     = &FileStorage{Path: filepath.Join(testStorageBase, "acme", testCAHost)}
+)
 
-func (s *FileStorage) clean() error {
-	return os.RemoveAll(s.Path)
-}
+func (s *FileStorage) clean() error { return os.RemoveAll(testStorageBase) }

vendor/github.com/xenolf/lego/acme/messages.go

-package acme
-
-import (
-	"time"
-
-	"gopkg.in/square/go-jose.v1"
-)
-
-type directory struct {
-	NewAuthzURL   string `json:"new-authz"`
-	NewCertURL    string `json:"new-cert"`
-	NewRegURL     string `json:"new-reg"`
-	RevokeCertURL string `json:"revoke-cert"`
-}
-
-type registrationMessage struct {
-	Resource string   `json:"resource"`
-	Contact  []string `json:"contact"`
-	Delete   bool     `json:"delete,omitempty"`
-}
-
-// Registration is returned by the ACME server after the registration
-// The client implementation should save this registration somewhere.
-type Registration struct {
-	Resource       string          `json:"resource,omitempty"`
-	ID             int             `json:"id"`
-	Key            jose.JsonWebKey `json:"key"`
-	Contact        []string        `json:"contact"`
-	Agreement      string          `json:"agreement,omitempty"`
-	Authorizations string          `json:"authorizations,omitempty"`
-	Certificates   string          `json:"certificates,omitempty"`
-}
-
-// RegistrationResource represents all important informations about a registration
-// of which the client needs to keep track itself.
-type RegistrationResource struct {
-	Body        Registration `json:"body,omitempty"`
-	URI         string       `json:"uri,omitempty"`
-	NewAuthzURL string       `json:"new_authzr_uri,omitempty"`
-	TosURL      string       `json:"terms_of_service,omitempty"`
-}
-
-type authorizationResource struct {
-	Body       authorization
-	Domain     string
-	NewCertURL string
-	AuthURL    string
-}
-
-type authorization struct {
-	Resource     string      `json:"resource,omitempty"`
-	Identifier   identifier  `json:"identifier"`
-	Status       string      `json:"status,omitempty"`
-	Expires      time.Time   `json:"expires,omitempty"`
-	Challenges   []challenge `json:"challenges,omitempty"`
-	Combinations [][]int     `json:"combinations,omitempty"`
-}
-
-type identifier struct {
-	Type  string `json:"type"`
-	Value string `json:"value"`
-}
-
-type validationRecord struct {
-	URI               string   `json:"url,omitempty"`
-	Hostname          string   `json:"hostname,omitempty"`
-	Port              string   `json:"port,omitempty"`
-	ResolvedAddresses []string `json:"addressesResolved,omitempty"`
-	UsedAddress       string   `json:"addressUsed,omitempty"`
-}
-
-type challenge struct {
-	Resource          string             `json:"resource,omitempty"`
-	Type              Challenge          `json:"type,omitempty"`
-	Status            string             `json:"status,omitempty"`
-	URI               string             `json:"uri,omitempty"`
-	Token             string             `json:"token,omitempty"`
-	KeyAuthorization  string             `json:"keyAuthorization,omitempty"`
-	TLS               bool               `json:"tls,omitempty"`
-	Iterations        int                `json:"n,omitempty"`
-	Error             RemoteError        `json:"error,omitempty"`
-	ValidationRecords []validationRecord `json:"validationRecord,omitempty"`
-}
-
-type csrMessage struct {
-	Resource       string   `json:"resource,omitempty"`
-	Csr            string   `json:"csr"`
-	Authorizations []string `json:"authorizations"`
-}
-
-type revokeCertMessage struct {
-	Resource    string `json:"resource"`
-	Certificate string `json:"certificate"`
-}
-
-type deactivateAuthMessage struct {
-	Resource string `json:"resource,omitempty"`
-	Status   string `jsom:"status"`
-}
-
-// CertificateResource represents a CA issued certificate.
-// PrivateKey, Certificate and IssuerCertificate are all
-// already PEM encoded and can be directly written to disk.
-// Certificate may be a certificate bundle, depending on the
-// options supplied to create it.
-type CertificateResource struct {
-	Domain            string `json:"domain"`
-	CertURL           string `json:"certUrl"`
-	CertStableURL     string `json:"certStableUrl"`
-	AccountRef        string `json:"accountRef,omitempty"`
-	PrivateKey        []byte `json:"-"`
-	Certificate       []byte `json:"-"`
-	IssuerCertificate []byte `json:"-"`
-	CSR               []byte `json:"-"`
-}

vendor/github.com/xenolf/lego/acme/tls_sni_challenge.go

-package acme
-
-import (
-	"crypto/rsa"
-	"crypto/sha256"
-	"crypto/tls"
-	"encoding/hex"
-	"fmt"
-	"log"
-)
-
-type tlsSNIChallenge struct {
-	jws      *jws
-	validate validateFunc
-	provider ChallengeProvider
-}
-
-func (t *tlsSNIChallenge) Solve(chlng challenge, domain string) error {
-	// FIXME: https://github.com/ietf-wg-acme/acme/pull/22
-	// Currently we implement this challenge to track boulder, not the current spec!
-
-	logf("[INFO][%s] acme: Trying to solve TLS-SNI-01", domain)
-
-	// Generate the Key Authorization for the challenge
-	keyAuth, err := getKeyAuthorization(chlng.Token, t.jws.privKey)
-	if err != nil {
-		return err
-	}
-
-	err = t.provider.Present(domain, chlng.Token, keyAuth)
-	if err != nil {
-		return fmt.Errorf("[%s] error presenting token: %v", domain, err)
-	}
-	defer func() {
-		err := t.provider.CleanUp(domain, chlng.Token, keyAuth)
-		if err != nil {
-			log.Printf("[%s] error cleaning up: %v", domain, err)
-		}
-	}()
-	return t.validate(t.jws, domain, chlng.URI, challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
-}
-
-// TLSSNI01ChallengeCert returns a certificate and target domain for the `tls-sni-01` challenge
-func TLSSNI01ChallengeCert(keyAuth string) (tls.Certificate, string, error) {
-	// generate a new RSA key for the certificates
-	tempPrivKey, err := generatePrivateKey(RSA2048)
-	if err != nil {
-		return tls.Certificate{}, "", err
-	}
-	rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
-	rsaPrivPEM := pemEncode(rsaPrivKey)
-
-	zBytes := sha256.Sum256([]byte(keyAuth))
-	z := hex.EncodeToString(zBytes[:sha256.Size])
-	domain := fmt.Sprintf("%s.%s.acme.invalid", z[:32], z[32:])
-	tempCertPEM, err := generatePemCert(rsaPrivKey, domain)
-	if err != nil {
-		return tls.Certificate{}, "", err
-	}
-
-	certificate, err := tls.X509KeyPair(tempCertPEM, rsaPrivPEM)
-	if err != nil {
-		return tls.Certificate{}, "", err
-	}
-
-	return certificate, domain, nil
-}

vendor/github.com/xenolf/lego/acme/tls_sni_challenge_server.go

-package acme
-
-import (
-	"crypto/tls"
-	"fmt"
-	"net"
-	"net/http"
-)
-
-// TLSProviderServer implements ChallengeProvider for `TLS-SNI-01` challenge
-// It may be instantiated without using the NewTLSProviderServer function if
-// you want only to use the default values.
-type TLSProviderServer struct {
-	iface    string
-	port     string
-	done     chan bool
-	listener net.Listener
-}
-
-// NewTLSProviderServer creates a new TLSProviderServer on the selected interface and port.
-// Setting iface and / or port to an empty string will make the server fall back to
-// the "any" interface and port 443 respectively.
-func NewTLSProviderServer(iface, port string) *TLSProviderServer {
-	return &TLSProviderServer{iface: iface, port: port}
-}
-
-// Present makes the keyAuth available as a cert
-func (s *TLSProviderServer) Present(domain, token, keyAuth string) error {
-	if s.port == "" {
-		s.port = "443"
-	}
-
-	cert, _, err := TLSSNI01ChallengeCert(keyAuth)
-	if err != nil {
-		return err
-	}
-
-	tlsConf := new(tls.Config)
-	tlsConf.Certificates = []tls.Certificate{cert}
-
-	s.listener, err = tls.Listen("tcp", net.JoinHostPort(s.iface, s.port), tlsConf)
-	if err != nil {
-		return fmt.Errorf("Could not start HTTPS server for challenge -> %v", err)
-	}
-
-	s.done = make(chan bool)
-	go func() {
-		http.Serve(s.listener, nil)
-		s.done <- true
-	}()
-	return nil
-}
-
-// CleanUp closes the HTTP server.
-func (s *TLSProviderServer) CleanUp(domain, token, keyAuth string) error {
-	if s.listener == nil {
-		return nil
-	}
-	s.listener.Close()
-	<-s.done
-	return nil
-}

vendor/github.com/xenolf/lego/acme/challenges.go → vendor/github.com/xenolf/lego/acmev2/challenges.go

@@ -7,9 +7,6 @@ const (
 	// HTTP01 is the "http-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#http
 	// Note: HTTP01ChallengePath returns the URL path to fulfill this challenge
 	HTTP01 = Challenge("http-01")
-	// TLSSNI01 is the "tls-sni-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#tls-with-server-name-indication-tls-sni
-	// Note: TLSSNI01ChallengeCert returns a certificate to fulfill this challenge
-	TLSSNI01 = Challenge("tls-sni-01")
 	// DNS01 is the "dns-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#dns
 	// Note: DNS01Record returns a DNS record which will fulfill this challenge
 	DNS01 = Challenge("dns-01")

vendor/github.com/xenolf/lego/acme/client.go → vendor/github.com/xenolf/lego/acmev2/client.go

@@ -5,13 +5,11 @@ import (
 	"crypto"
 	"crypto/x509"
 	"encoding/base64"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io/ioutil"
 	"log"
 	"net"
-	"net/http"
 	"regexp"
 	"strconv"
 	"strings"
@@ -82,27 +80,26 @@ func NewClient(caDirURL string, user User, keyType KeyType) (*Client, error) {
 		return nil, fmt.Errorf("get directory at '%s': %v", caDirURL, err)
 	}
 
-	if dir.NewRegURL == "" {
+	if dir.NewAccountURL == "" {
 		return nil, errors.New("directory missing new registration URL")
 	}
-	if dir.NewAuthzURL == "" {
-		return nil, errors.New("directory missing new authz URL")
+	if dir.NewOrderURL == "" {
+		return nil, errors.New("directory missing new order URL")
 	}
-	if dir.NewCertURL == "" {
-		return nil, errors.New("directory missing new certificate URL")
-	}
-	if dir.RevokeCertURL == "" {
+	/*if dir.RevokeCertURL == "" {
 		return nil, errors.New("directory missing revoke certificate URL")
-	}
+	}*/
 
-	jws := &jws{privKey: privKey, directoryURL: caDirURL}
+	jws := &jws{privKey: privKey, getNonceURL: dir.NewNonceURL}
+	if reg := user.GetRegistration(); reg != nil {
+		jws.kid = reg.URI
+	}
 
 	// REVIEW: best possibility?
 	// Add all available solvers with the right index as per ACME
 	// spec to this map. Otherwise they won`t be found.
 	solvers := make(map[Challenge]solver)
 	solvers[HTTP01] = &httpChallenge{jws: jws, validate: validate, provider: &HTTPProviderServer{}}
-	solvers[TLSSNI01] = &tlsSNIChallenge{jws: jws, validate: validate, provider: &TLSProviderServer{}}
 
 	return &Client{directory: dir, user: user, jws: jws, keyType: keyType, solvers: solvers}, nil
 }
@@ -112,8 +109,6 @@ func (c *Client) SetChallengeProvider(challenge Challenge, p ChallengeProvider)
 	switch challenge {
 	case HTTP01:
 		c.solvers[challenge] = &httpChallenge{jws: c.jws, validate: validate, provider: p}
-	case TLSSNI01:
-		c.solvers[challenge] = &tlsSNIChallenge{jws: c.jws, validate: validate, provider: p}
 	case DNS01:
 		c.solvers[challenge] = &dnsChallenge{jws: c.jws, validate: validate, provider: p}
 	default:
@@ -141,24 +136,6 @@ func (c *Client) SetHTTPAddress(iface string) error {
 	return nil
 }
 
-// SetTLSAddress specifies a custom interface:port to be used for TLS based challenges.
-// If this option is not used, the default port 443 and all interfaces will be used.
-// To only specify a port and no interface use the ":port" notation.
-//
-// NOTE: This REPLACES any custom TLS-SNI provider previously set by calling
-// c.SetChallengeProvider with the default TLS-SNI challenge provider.
-func (c *Client) SetTLSAddress(iface string) error {
-	host, port, err := net.SplitHostPort(iface)
-	if err != nil {
-		return err
-	}
-
-	if chlng, ok := c.solvers[TLSSNI01]; ok {
-		chlng.(*tlsSNIChallenge).provider = NewTLSProviderServer(host, port)
-	}
-	return nil
-}
-
 // ExcludeChallenges explicitly removes challenges from the pool for solving.
 func (c *Client) ExcludeChallenges(challenges []Challenge) {
 	// Loop through all challenges and delete the requested one if found.
@@ -167,59 +144,69 @@ func (c *Client) ExcludeChallenges(challenges []Challenge) {
 	}
 }
 
+// GetToSURL returns the current ToS URL from the Directory
+func (c *Client) GetToSURL() string {
+	return c.directory.Meta.TermsOfService
+}
+
 // Register the current account to the ACME server.
-func (c *Client) Register() (*RegistrationResource, error) {
+func (c *Client) Register(tosAgreed bool) (*RegistrationResource, error) {
 	if c == nil || c.user == nil {
 		return nil, errors.New("acme: cannot register a nil client or user")
 	}
 	logf("[INFO] acme: Registering account for %s", c.user.GetEmail())
 
-	regMsg := registrationMessage{
-		Resource: "new-reg",
-	}
+	accMsg := accountMessage{}
 	if c.user.GetEmail() != "" {
-		regMsg.Contact = []string{"mailto:" + c.user.GetEmail()}
+		accMsg.Contact = []string{"mailto:" + c.user.GetEmail()}
 	} else {
-		regMsg.Contact = []string{}
+		accMsg.Contact = []string{}
 	}
+	accMsg.TermsOfServiceAgreed = tosAgreed
 
-	var serverReg Registration
-	var regURI string
-	hdr, err := postJSON(c.jws, c.directory.NewRegURL, regMsg, &serverReg)
+	var serverReg accountMessage
+	hdr, err := postJSON(c.jws, c.directory.NewAccountURL, accMsg, &serverReg)
 	if err != nil {
 		remoteErr, ok := err.(RemoteError)
 		if ok && remoteErr.StatusCode == 409 {
-			regURI = hdr.Get("Location")
-			regMsg = registrationMessage{
-				Resource: "reg",
-			}
-			if hdr, err = postJSON(c.jws, regURI, regMsg, &serverReg); err != nil {
-				return nil, err
-			}
 		} else {
 			return nil, err
 		}
 	}
 
-	reg := &RegistrationResource{Body: serverReg}
+	reg := &RegistrationResource{
+		URI:  hdr.Get("Location"),
+		Body: serverReg,
+	}
+	c.jws.kid = reg.URI
 
-	links := parseLinks(hdr["Link"])
+	return reg, nil
+}
+
+// ResolveAccountByKey will attempt to look up an account using the given account key
+// and return its registration resource.
+func (c *Client) ResolveAccountByKey() (*RegistrationResource, error) {
+	logf("[INFO] acme: Trying to resolve account by key")
 
-	if regURI == "" {
-		regURI = hdr.Get("Location")
+	acc := accountMessage{OnlyReturnExisting: true}
+	hdr, err := postJSON(c.jws, c.directory.NewAccountURL, acc, &acc)
+	if err != nil {
+		return nil, err
 	}
-	reg.URI = regURI
-	if links["terms-of-service"] != "" {
-		reg.TosURL = links["terms-of-service"]
+
+	accountLink := hdr.Get("Location")
+	if accountLink == "" {
+		return nil, errors.New("Server did not return the account link")
 	}
 
-	if links["next"] != "" {
-		reg.NewAuthzURL = links["next"]
-	} else {
-		return nil, errors.New("acme: The server did not return 'next' link to proceed")
+	var retAccount accountMessage
+	c.jws.kid = accountLink
+	hdr, err = postJSON(c.jws, accountLink, accountMessage{}, &retAccount)
+	if err != nil {
+		return nil, err
 	}
 
-	return reg, nil
+	return &RegistrationResource{URI: accountLink, Body: retAccount}, nil
 }
 
 // DeleteRegistration deletes the client's user registration from the ACME
@@ -230,12 +217,11 @@ func (c *Client) DeleteRegistration() error {
 	}
 	logf("[INFO] acme: Deleting account for %s", c.user.GetEmail())
 
-	regMsg := registrationMessage{
-		Resource: "reg",
-		Delete:   true,
+	accMsg := accountMessage{
+		Status: "deactivated",
 	}
 
-	_, err := postJSON(c.jws, c.user.GetRegistration().URI, regMsg, nil)
+	_, err := postJSON(c.jws, c.user.GetRegistration().URI, accMsg, nil)
 	if err != nil {
 		return err
 	}
@@ -255,46 +241,23 @@ func (c *Client) QueryRegistration() (*RegistrationResource, error) {
 	// Log the URL here instead of the email as the email may not be set
 	logf("[INFO] acme: Querying account for %s", c.user.GetRegistration().URI)
 
-	regMsg := registrationMessage{
-		Resource: "reg",
-	}
+	accMsg := accountMessage{}
 
-	var serverReg Registration
-	hdr, err := postJSON(c.jws, c.user.GetRegistration().URI, regMsg, &serverReg)
+	var serverReg accountMessage
+	_, err := postJSON(c.jws, c.user.GetRegistration().URI, accMsg, &serverReg)
 	if err != nil {
 		return nil, err
 	}
 
 	reg := &RegistrationResource{Body: serverReg}
 
-	links := parseLinks(hdr["Link"])
 	// Location: header is not returned so this needs to be populated off of
 	// existing URI
 	reg.URI = c.user.GetRegistration().URI
-	if links["terms-of-service"] != "" {
-		reg.TosURL = links["terms-of-service"]
-	}
-
-	if links["next"] != "" {
-		reg.NewAuthzURL = links["next"]
-	} else {
-		return nil, errors.New("acme: No new-authz link in response to registration query")
-	}
 
 	return reg, nil
 }
 
-// AgreeToTOS updates the Client registration and sends the agreement to
-// the server.
-func (c *Client) AgreeToTOS() error {
-	reg := c.user.GetRegistration()
-
-	reg.Body.Agreement = c.user.GetRegistration().TosURL
-	reg.Body.Resource = "reg"
-	_, err := postJSON(c.jws, c.user.GetRegistration().URI, c.user.GetRegistration().Body, nil)
-	return err
-}
-
 // ObtainCertificateForCSR tries to obtain a certificate matching the CSR passed into it.
 // The domains are inferred from the CommonName and SubjectAltNames, if any. The private key
 // for this CSR is not required.
@@ -327,17 +290,25 @@ DNSNames:
 		logf("[INFO][%s] acme: Obtaining SAN certificate given a CSR", strings.Join(domains, ", "))
 	}
 
-	challenges, failures := c.getChallenges(domains)
+	order, err := c.createOrderForIdentifiers(domains)
+	if err != nil {
+		identErrors := make(map[string]error)
+		for _, auth := range order.Identifiers {
+			identErrors[auth.Value] = err
+		}
+		return CertificateResource{}, identErrors
+	}
+	authz, failures := c.getAuthzForOrder(order)
 	// If any challenge fails - return. Do not generate partial SAN certificates.
 	if len(failures) > 0 {
-		for _, auth := range challenges {
+		/*for _, auth := range authz {
 			c.disableAuthz(auth)
-		}
+		}*/
 
 		return CertificateResource{}, failures
 	}
 
-	errs := c.solveChallenges(challenges)
+	errs := c.solveChallengeForAuthz(authz)
 	// If any challenge fails - return. Do not generate partial SAN certificates.
 	if len(errs) > 0 {
 		return CertificateResource{}, errs
@@ -345,10 +316,10 @@ DNSNames:
 
 	logf("[INFO][%s] acme: Validations succeeded; requesting certificates", strings.Join(domains, ", "))
 
-	cert, err := c.requestCertificateForCsr(challenges, bundle, csr.Raw, nil)
+	cert, err := c.requestCertificateForCsr(order, bundle, csr.Raw, nil)
 	if err != nil {
-		for _, chln := range challenges {
-			failures[chln.Domain] = err
+		for _, chln := range authz {
+			failures[chln.Identifier.Value] = err
 		}
 	}
 
@@ -374,17 +345,25 @@ func (c *Client) ObtainCertificate(domains []string, bundle bool, privKey crypto
 		logf("[INFO][%s] acme: Obtaining SAN certificate", strings.Join(domains, ", "))
 	}
 
-	challenges, failures := c.getChallenges(domains)
+	order, err := c.createOrderForIdentifiers(domains)
+	if err != nil {
+		identErrors := make(map[string]error)
+		for _, auth := range order.Identifiers {
+			identErrors[auth.Value] = err
+		}
+		return CertificateResource{}, identErrors
+	}
+	authz, failures := c.getAuthzForOrder(order)
 	// If any challenge fails - return. Do not generate partial SAN certificates.
 	if len(failures) > 0 {
-		for _, auth := range challenges {
+		/*for _, auth := range authz {
 			c.disableAuthz(auth)
-		}
+		}*/
 
 		return CertificateResource{}, failures
 	}
 
-	errs := c.solveChallenges(challenges)
+	errs := c.solveChallengeForAuthz(authz)
 	// If any challenge fails - return. Do not generate partial SAN certificates.
 	if len(errs) > 0 {
 		return CertificateResource{}, errs
@@ -392,10 +371,10 @@ func (c *Client) ObtainCertificate(domains []string, bundle bool, privKey crypto
 
 	logf("[INFO][%s] acme: Validations succeeded; requesting certificates", strings.Join(domains, ", "))
 
-	cert, err := c.requestCertificate(challenges, bundle, privKey, mustStaple)
+	cert, err := c.requestCertificateForOrder(order, bundle, privKey, mustStaple)
 	if err != nil {
-		for _, chln := range challenges {
-			failures[chln.Domain] = err
+		for _, auth := range authz {
+			failures[auth.Identifier.Value] = err
 		}
 	}
 
@@ -416,7 +395,7 @@ func (c *Client) RevokeCertificate(certificate []byte) error {
 
 	encodedCert := base64.URLEncoding.EncodeToString(x509Cert.Raw)
 
-	_, err = postJSON(c.jws, c.directory.RevokeCertURL, revokeCertMessage{Resource: "revoke-cert", Certificate: encodedCert}, nil)
+	_, err = postJSON(c.jws, c.directory.RevokeCertURL, revokeCertMessage{Certificate: encodedCert}, nil)
 	return err
 }
 
@@ -484,129 +463,123 @@ func (c *Client) RenewCertificate(cert CertificateResource, bundle, mustStaple b
 	return newCert, failures[cert.Domain]
 }
 
+func (c *Client) createOrderForIdentifiers(domains []string) (orderResource, error) {
+
+	var identifiers []identifier
+	for _, domain := range domains {
+		identifiers = append(identifiers, identifier{Type: "dns", Value: domain})
+	}
+
+	order := orderMessage{
+		Identifiers: identifiers,
+	}
+
+	var response orderMessage
+	hdr, err := postJSON(c.jws, c.directory.NewOrderURL, order, &response)
+	if err != nil {
+		return orderResource{}, err
+	}
+
+	orderRes := orderResource{
+		URL:          hdr.Get("Location"),
+		orderMessage: response,
+	}
+	return orderRes, nil
+}
+
 // Looks through the challenge combinations to find a solvable match.
 // Then solves the challenges in series and returns.
-func (c *Client) solveChallenges(challenges []authorizationResource) map[string]error {
+func (c *Client) solveChallengeForAuthz(authorizations []authorization) map[string]error {
 	// loop through the resources, basically through the domains.
 	failures := make(map[string]error)
-	for _, authz := range challenges {
-		if authz.Body.Status == "valid" {
+	for _, authz := range authorizations {
+		if authz.Status == "valid" {
 			// Boulder might recycle recent validated authz (see issue #267)
-			logf("[INFO][%s] acme: Authorization already valid; skipping challenge", authz.Domain)
+			logf("[INFO][%s] acme: Authorization already valid; skipping challenge", authz.Identifier.Value)
 			continue
 		}
+
 		// no solvers - no solving
-		if solvers := c.chooseSolvers(authz.Body, authz.Domain); solvers != nil {
-			for i, solver := range solvers {
-				// TODO: do not immediately fail if one domain fails to validate.
-				err := solver.Solve(authz.Body.Challenges[i], authz.Domain)
+		if i, solver := c.chooseSolver(authz, authz.Identifier.Value); solver != nil {
+			err := solver.Solve(authz.Challenges[i], authz.Identifier.Value)
 			if err != nil {
-					c.disableAuthz(authz)
-					failures[authz.Domain] = err
-				}
+				//c.disableAuthz(authz.Identifier)
+				failures[authz.Identifier.Value] = err
 			}
 		} else {
-			c.disableAuthz(authz)
-			failures[authz.Domain] = fmt.Errorf("[%s] acme: Could not determine solvers", authz.Domain)
+			//c.disableAuthz(authz)
+			failures[authz.Identifier.Value] = fmt.Errorf("[%s] acme: Could not determine solvers", authz.Identifier.Value)
 		}
 	}
 
 	return failures
 }
 
-// Checks all combinations from the server and returns an array of
-// solvers which should get executed in series.
-func (c *Client) chooseSolvers(auth authorization, domain string) map[int]solver {
-	for _, combination := range auth.Combinations {
-		solvers := make(map[int]solver)
-		for _, idx := range combination {
-			if solver, ok := c.solvers[auth.Challenges[idx].Type]; ok {
-				solvers[idx] = solver
-			} else {
-				logf("[INFO][%s] acme: Could not find solver for: %s", domain, auth.Challenges[idx].Type)
+// Checks all challenges from the server in order and returns the first matching solver.
+func (c *Client) chooseSolver(auth authorization, domain string) (int, solver) {
+	for i, challenge := range auth.Challenges {
+		if solver, ok := c.solvers[Challenge(challenge.Type)]; ok {
+			return i, solver
 		}
+		logf("[INFO][%s] acme: Could not find solver for: %s", domain, challenge.Type)
 	}
-
-		// If we can solve the whole combination, return the solvers
-		if len(solvers) == len(combination) {
-			return solvers
-		}
-	}
-	return nil
+	return 0, nil
 }
 
 // Get the challenges needed to proof our identifier to the ACME server.
-func (c *Client) getChallenges(domains []string) ([]authorizationResource, map[string]error) {
-	resc, errc := make(chan authorizationResource), make(chan domainError)
+func (c *Client) getAuthzForOrder(order orderResource) ([]authorization, map[string]error) {
+	resc, errc := make(chan authorization), make(chan domainError)
 
 	delay := time.Second / overallRequestLimit
 
-	for _, domain := range domains {
+	for _, authzURL := range order.Authorizations {
 		time.Sleep(delay)
 
-		go func(domain string) {
-			authMsg := authorization{Resource: "new-authz", Identifier: identifier{Type: "dns", Value: domain}}
+		go func(authzURL string) {
 			var authz authorization
-			hdr, err := postJSON(c.jws, c.user.GetRegistration().NewAuthzURL, authMsg, &authz)
+			_, err := getJSON(authzURL, &authz)
 			if err != nil {
-				errc <- domainError{Domain: domain, Error: err}
+				errc <- domainError{Domain: authz.Identifier.Value, Error: err}
 				return
 			}
 
-			links := parseLinks(hdr["Link"])
-			if links["next"] == "" {
-				logf("[ERROR][%s] acme: Server did not provide next link to proceed", domain)
-				errc <- domainError{Domain: domain, Error: errors.New("Server did not provide next link to proceed")}
-				return
+			resc <- authz
+		}(authzURL)
 	}
 
-			resc <- authorizationResource{Body: authz, NewCertURL: links["next"], AuthURL: hdr.Get("Location"), Domain: domain}
-		}(domain)
-	}
-
-	responses := make(map[string]authorizationResource)
+	var responses []authorization
 	failures := make(map[string]error)
-	for i := 0; i < len(domains); i++ {
+	for i := 0; i < len(order.Authorizations); i++ {
 		select {
 		case res := <-resc:
-			responses[res.Domain] = res
+			responses = append(responses, res)
 		case err := <-errc:
 			failures[err.Domain] = err.Error
 		}
 	}
 
-	challenges := make([]authorizationResource, 0, len(responses))
-	for _, domain := range domains {
-		if challenge, ok := responses[domain]; ok {
-			challenges = append(challenges, challenge)
-		}
-	}
-
-	logAuthz(challenges)
+	logAuthz(order)
 
 	close(resc)
 	close(errc)
 
-	return challenges, failures
+	return responses, failures
 }
 
-func logAuthz(authz []authorizationResource) {
-	for _, auth := range authz {
-		logf("[INFO][%s] AuthURL: %s", auth.Domain, auth.AuthURL)
+func logAuthz(order orderResource) {
+	for i, auth := range order.Authorizations {
+		logf("[INFO][%s] AuthURL: %s", order.Identifiers[i].Value, auth)
 	}
 }
 
 // cleanAuthz loops through the passed in slice and disables any auths which are not "valid"
-func (c *Client) disableAuthz(auth authorizationResource) error {
+func (c *Client) disableAuthz(authURL string) error {
 	var disabledAuth authorization
-	_, err := postJSON(c.jws, auth.AuthURL, deactivateAuthMessage{Resource: "authz", Status: "deactivated"}, &disabledAuth)
+	_, err := postJSON(c.jws, authURL, deactivateAuthMessage{Status: "deactivated"}, &disabledAuth)
 	return err
 }
 
-func (c *Client) requestCertificate(authz []authorizationResource, bundle bool, privKey crypto.PrivateKey, mustStaple bool) (CertificateResource, error) {
-	if len(authz) == 0 {
-		return CertificateResource{}, errors.New("Passed no authorizations to requestCertificate!")
-	}
+func (c *Client) requestCertificateForOrder(order orderResource, bundle bool, privKey crypto.PrivateKey, mustStaple bool) (CertificateResource, error) {
 
 	var err error
 	if privKey == nil {
@@ -617,50 +590,65 @@ func (c *Client) requestCertificate(authz []authorizationResource, bundle bool,
 	}
 
 	// determine certificate name(s) based on the authorization resources
-	commonName := authz[0]
+	commonName := order.Identifiers[0].Value
 	var san []string
-	for _, auth := range authz[1:] {
-		san = append(san, auth.Domain)
+	for _, auth := range order.Identifiers {
+		san = append(san, auth.Value)
 	}
 
 	// TODO: should the CSR be customizable?
-	csr, err := generateCsr(privKey, commonName.Domain, san, mustStaple)
+	csr, err := generateCsr(privKey, commonName, san, mustStaple)
 	if err != nil {
 		return CertificateResource{}, err
 	}
 
-	return c.requestCertificateForCsr(authz, bundle, csr, pemEncode(privKey))
+	return c.requestCertificateForCsr(order, bundle, csr, pemEncode(privKey))
 }
 
-func (c *Client) requestCertificateForCsr(authz []authorizationResource, bundle bool, csr []byte, privateKeyPem []byte) (CertificateResource, error) {
-	commonName := authz[0]
+func (c *Client) requestCertificateForCsr(order orderResource, bundle bool, csr []byte, privateKeyPem []byte) (CertificateResource, error) {
+	commonName := order.Identifiers[0].Value
 
 	var authURLs []string
-	for _, auth := range authz[1:] {
-		authURLs = append(authURLs, auth.AuthURL)
+	for _, auth := range order.Identifiers[1:] {
+		authURLs = append(authURLs, auth.Value)
 	}
 
-	csrString := base64.URLEncoding.EncodeToString(csr)
-	jsonBytes, err := json.Marshal(csrMessage{Resource: "new-cert", Csr: csrString, Authorizations: authURLs})
-	if err != nil {
-		return CertificateResource{}, err
+	csrString := base64.RawURLEncoding.EncodeToString(csr)
+	var retOrder orderMessage
+	_, error := postJSON(c.jws, order.Finalize, csrMessage{Csr: csrString}, &retOrder)
+	if error != nil {
+		return CertificateResource{}, error
 	}
 
-	resp, err := c.jws.post(commonName.NewCertURL, jsonBytes)
-	if err != nil {
-		return CertificateResource{}, err
+	if retOrder.Status == "invalid" {
+		return CertificateResource{}, error
 	}
 
 	certRes := CertificateResource{
-		Domain:     commonName.Domain,
-		CertURL:    resp.Header.Get("Location"),
+		Domain:     commonName,
+		CertURL:    retOrder.Certificate,
 		PrivateKey: privateKeyPem,
 	}
 
+	if retOrder.Status == "valid" {
+		// if the certificate is available right away, short cut!
+		ok, err := c.checkCertResponse(retOrder, &certRes, bundle)
+		if err != nil {
+			return CertificateResource{}, err
+		}
+
+		if ok {
+			return certRes, nil
+		}
+	}
+
 	maxChecks := 1000
 	for i := 0; i < maxChecks; i++ {
-		done, err := c.checkCertResponse(resp, &certRes, bundle)
-		resp.Body.Close()
+		_, err := getJSON(order.URL, &retOrder)
+		if err != nil {
+			return CertificateResource{}, err
+		}
+		done, err := c.checkCertResponse(retOrder, &certRes, bundle)
 		if err != nil {
 			return CertificateResource{}, err
 		}
@@ -670,43 +658,36 @@ func (c *Client) requestCertificateForCsr(authz []authorizationResource, bundle
 		if i == maxChecks-1 {
 			return CertificateResource{}, fmt.Errorf("polled for certificate %d times; giving up", i)
 		}
-		resp, err = httpGet(certRes.CertURL)
-		if err != nil {
-			return CertificateResource{}, err
-		}
 	}
 
 	return certRes, nil
 }
 
-// checkCertResponse checks resp to see if a certificate is contained in the
-// response, and if so, loads it into certRes and returns true. If the cert
-// is not yet ready, it returns false. This function honors the waiting period
-// required by the Retry-After header of the response, if specified. This
-// function may read from resp.Body but does NOT close it. The certRes input
+// checkCertResponse checks to see if the certificate is ready and a link is contained in the
+// response. if so, loads it into certRes and returns true. If the cert
+// is not yet ready, it returns false. The certRes input
 // should already have the Domain (common name) field populated. If bundle is
 // true, the certificate will be bundled with the issuer's cert.
-func (c *Client) checkCertResponse(resp *http.Response, certRes *CertificateResource, bundle bool) (bool, error) {
-	switch resp.StatusCode {
-	case 201, 202:
-		cert, err := ioutil.ReadAll(limitReader(resp.Body, maxBodySize))
+func (c *Client) checkCertResponse(order orderMessage, certRes *CertificateResource, bundle bool) (bool, error) {
+
+	switch order.Status {
+	case "valid":
+		resp, err := httpGet(order.Certificate)
 		if err != nil {
 			return false, err
 		}
 
-		// The server returns a body with a length of zero if the
-		// certificate was not ready at the time this request completed.
-		// Otherwise the body is the certificate.
-		if len(cert) > 0 {
-			certRes.CertStableURL = resp.Header.Get("Content-Location")
-			certRes.AccountRef = c.user.GetRegistration().URI
-
-			issuedCert := pemEncode(derCertificateBytes(cert))
+		cert, err := ioutil.ReadAll(limitReader(resp.Body, maxBodySize))
+		if err != nil {
+			return false, err
+		}
 
 		// The issuer certificate link is always supplied via an "up" link
 		// in the response headers of a new certificate.
 		links := parseLinks(resp.Header["Link"])
-			issuerCert, err := c.getIssuerCertificate(links["up"])
+		if link, ok := links["up"]; ok {
+			issuerCert, err := c.getIssuerCertificate(link)
+
 			if err != nil {
 				// If we fail to acquire the issuer cert, return the issued certificate - do not fail.
 				logf("[WARNING][%s] acme: Could not bundle issuer certificate: %v", certRes.Domain, err)
@@ -716,31 +697,26 @@ func (c *Client) checkCertResponse(resp *http.Response, certRes *CertificateReso
 				// If bundle is true, we want to return a certificate bundle.
 				// To do this, we append the issuer cert to the issued cert.
 				if bundle {
-					issuedCert = append(issuedCert, issuerCert...)
-				}
+					cert = append(cert, issuerCert...)
 				}
 
-			certRes.Certificate = issuedCert
 				certRes.IssuerCertificate = issuerCert
-			logf("[INFO][%s] Server responded with a certificate.", certRes.Domain)
-			return true, nil
 			}
-
-		// The certificate was granted but is not yet issued.
-		// Check retry-after and loop.
-		ra := resp.Header.Get("Retry-After")
-		retryAfter, err := strconv.Atoi(ra)
-		if err != nil {
-			return false, err
 		}
 
-		logf("[INFO][%s] acme: Server responded with status 202; retrying after %ds", certRes.Domain, retryAfter)
-		time.Sleep(time.Duration(retryAfter) * time.Second)
+		certRes.Certificate = cert
+		certRes.CertURL = order.Certificate
+		certRes.CertStableURL = order.Certificate
+		logf("[INFO][%s] Server responded with a certificate.", certRes.Domain)
+		return true, nil
 
+	case "processing":
 		return false, nil
-	default:
-		return false, handleHTTPError(resp)
+	case "invalid":
+		return false, errors.New("Order has invalid state: invalid")
 	}
+
+	return false, nil
 }
 
 // getIssuerCertificate requests the issuer certificate
@@ -786,10 +762,10 @@ func parseLinks(links []string) map[string]string {
 
 // validate makes the ACME server start validating a
 // challenge response, only returning once it is done.
-func validate(j *jws, domain, uri string, chlng challenge) error {
-	var challengeResponse challenge
+func validate(j *jws, domain, uri string, c challenge) error {
+	var chlng challenge
 
-	hdr, err := postJSON(j, uri, chlng, &challengeResponse)
+	hdr, err := postJSON(j, uri, c, &chlng)
 	if err != nil {
 		return err
 	}
@@ -797,27 +773,27 @@ func validate(j *jws, domain, uri string, chlng challenge) error {
 	// After the path is sent, the ACME server will access our server.
 	// Repeatedly check the server for an updated status on our request.
 	for {
-		switch challengeResponse.Status {
+		switch chlng.Status {
 		case "valid":
 			logf("[INFO][%s] The server validated our request", domain)
 			return nil
 		case "pending":
 			break
 		case "invalid":
-			return handleChallengeError(challengeResponse)
+			return handleChallengeError(chlng)
 		default:
-			return errors.New("The server returned an unexpected state.")
+			return errors.New("The server returned an unexpected state")
 		}
 
 		ra, err := strconv.Atoi(hdr.Get("Retry-After"))
 		if err != nil {
 			// The ACME server MUST return a Retry-After.
 			// If it doesn't, we'll just poll hard.
-			ra = 1
+			ra = 5
 		}
 		time.Sleep(time.Duration(ra) * time.Second)
 
-		hdr, err = getJSON(uri, &challengeResponse)
+		hdr, err = getJSON(uri, &chlng)
 		if err != nil {
 			return err
 		}

vendor/github.com/xenolf/lego/acme/crypto.go → vendor/github.com/xenolf/lego/acmev2/crypto.go

@@ -17,12 +17,12 @@ import (
 	"io/ioutil"
 	"math/big"
 	"net/http"
-	"strings"
 	"time"
 
 	"encoding/asn1"
 
 	"golang.org/x/crypto/ocsp"
+	jose "gopkg.in/square/go-jose.v2"
 )
 
 // KeyType represents the key algo as well as the key size or curve to use.
@@ -136,9 +136,9 @@ func getKeyAuthorization(token string, key interface{}) (string, error) {
 	}
 
 	// Generate the Key Authorization for the challenge
-	jwk := keyAsJWK(publicKey)
+	jwk := &jose.JSONWebKey{Key: publicKey}
 	if jwk == nil {
-		return "", errors.New("Could not generate JWK from key.")
+		return "", errors.New("Could not generate JWK from key")
 	}
 	thumbBytes, err := jwk.Thumbprint(crypto.SHA256)
 	if err != nil {
@@ -146,11 +146,7 @@ func getKeyAuthorization(token string, key interface{}) (string, error) {
 	}
 
 	// unpad the base64URL
-	keyThumb := base64.URLEncoding.EncodeToString(thumbBytes)
-	index := strings.Index(keyThumb, "=")
-	if index != -1 {
-		keyThumb = keyThumb[:index]
-	}
+	keyThumb := base64.RawURLEncoding.EncodeToString(thumbBytes)
 
 	return token + "." + keyThumb, nil
 }
@@ -177,7 +173,7 @@ func parsePEMBundle(bundle []byte) ([]*x509.Certificate, error) {
 	}
 
 	if len(certificates) == 0 {
-		return nil, errors.New("No certificates were found while parsing the bundle.")
+		return nil, errors.New("No certificates were found while parsing the bundle")
 	}
 
 	return certificates, nil

vendor/github.com/xenolf/lego/acme/dns_challenge.go → vendor/github.com/xenolf/lego/acmev2/dns_challenge.go

@@ -11,7 +11,6 @@ import (
 	"time"
 
 	"github.com/miekg/dns"
-	"golang.org/x/net/publicsuffix"
 )
 
 type preCheckDNSFunc func(fqdn, value string) (bool, error)
@@ -30,6 +29,7 @@ var defaultNameservers = []string{
 	"google-public-dns-b.google.com:53",
 }
 
+// RecursiveNameservers are used to pre-check DNS propagations
 var RecursiveNameservers = getNameservers(defaultResolvConf, defaultNameservers)
 
 // DNSTimeout is used to override the default DNS timeout of 10 seconds.
@@ -58,8 +58,7 @@ func getNameservers(path string, defaults []string) []string {
 func DNS01Record(domain, keyAuth string) (fqdn string, value string, ttl int) {
 	keyAuthShaBytes := sha256.Sum256([]byte(keyAuth))
 	// base64URL encoding without padding
-	keyAuthSha := base64.URLEncoding.EncodeToString(keyAuthShaBytes[:sha256.Size])
-	value = strings.TrimRight(keyAuthSha, "=")
+	value = base64.RawURLEncoding.EncodeToString(keyAuthShaBytes[:sha256.Size])
 	ttl = 120
 	fqdn = fmt.Sprintf("_acme-challenge.%s.", domain)
 	return
@@ -115,7 +114,7 @@ func (s *dnsChallenge) Solve(chlng challenge, domain string) error {
 		return err
 	}
 
-	return s.validate(s.jws, domain, chlng.URI, challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
+	return s.validate(s.jws, domain, chlng.URL, challenge{Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
 }
 
 // checkDNSPropagation checks if the expected TXT record has been propagated to all authoritative nameservers.
@@ -194,7 +193,7 @@ func dnsQuery(fqdn string, rtype uint16, nameservers []string, recursive bool) (
 
 		if err == dns.ErrTruncated {
 			tcp := &dns.Client{Net: "tcp", Timeout: DNSTimeout}
-			// If the TCP request suceeds, the err will reset to nil
+			// If the TCP request succeeds, the err will reset to nil
 			in, _, err = tcp.Exchange(m, ns)
 		}
 
@@ -242,10 +241,6 @@ func FindZoneByFqdn(fqdn string, nameservers []string) (string, error) {
 	labelIndexes := dns.Split(fqdn)
 	for _, index := range labelIndexes {
 		domain := fqdn[index:]
-		// Give up if we have reached the TLD
-		if isTLD(domain) {
-			break
-		}
 
 		in, err := dnsQuery(domain, dns.TypeSOA, nameservers, true)
 		if err != nil {
@@ -260,6 +255,13 @@ func FindZoneByFqdn(fqdn string, nameservers []string) (string, error) {
 
 		// Check if we got a SOA RR in the answer section
 		if in.Rcode == dns.RcodeSuccess {
+
+			// CNAME records cannot/should not exist at the root of a zone.
+			// So we skip a domain when a CNAME is found.
+			if dnsMsgContainsCNAME(in) {
+				continue
+			}
+
 			for _, ans := range in.Answer {
 				if soa, ok := ans.(*dns.SOA); ok {
 					zone := soa.Hdr.Name
@@ -273,11 +275,13 @@ func FindZoneByFqdn(fqdn string, nameservers []string) (string, error) {
 	return "", fmt.Errorf("Could not find the start of authority")
 }
 
-func isTLD(domain string) bool {
-	publicsuffix, _ := publicsuffix.PublicSuffix(UnFqdn(domain))
-	if publicsuffix == UnFqdn(domain) {
+// dnsMsgContainsCNAME checks for a CNAME answer in msg
+func dnsMsgContainsCNAME(msg *dns.Msg) bool {
+	for _, ans := range msg.Answer {
+		if _, ok := ans.(*dns.CNAME); ok {
 			return true
 		}
+	}
 	return false
 }
 

vendor/github.com/xenolf/lego/acme/error.go → vendor/github.com/xenolf/lego/acmev2/error.go

@@ -9,8 +9,8 @@ import (
 )
 
 const (
-	tosAgreementError = "Must agree to subscriber agreement before any further actions"
-	invalidNonceError = "JWS has invalid anti-replay nonce"
+	tosAgreementError = "Terms of service have changed"
+	invalidNonceError = "urn:ietf:params:acme:error:badNonce"
 )
 
 // RemoteError is the base type for all errors specific to the ACME protocol.
@@ -42,27 +42,11 @@ type domainError struct {
 	Error  error
 }
 
-type challengeError struct {
-	RemoteError
-	records []validationRecord
-}
-
-func (c challengeError) Error() string {
-
-	var errStr string
-	for _, validation := range c.records {
-		errStr = errStr + fmt.Sprintf("\tValidation for %s:%s\n\tResolved to:\n\t\t%s\n\tUsed: %s\n\n",
-			validation.Hostname, validation.Port, strings.Join(validation.ResolvedAddresses, "\n\t\t"), validation.UsedAddress)
-	}
-
-	return fmt.Sprintf("%s\nError Detail:\n%s", c.RemoteError.Error(), errStr)
-}
-
 func handleHTTPError(resp *http.Response) error {
 	var errorDetail RemoteError
 
 	contentType := resp.Header.Get("Content-Type")
-	if contentType == "application/json" || contentType == "application/problem+json" {
+	if contentType == "application/json" || strings.HasPrefix(contentType, "application/problem+json") {
 		err := json.NewDecoder(resp.Body).Decode(&errorDetail)
 		if err != nil {
 			return err
@@ -82,7 +66,7 @@ func handleHTTPError(resp *http.Response) error {
 		return TOSError{errorDetail}
 	}
 
-	if errorDetail.StatusCode == http.StatusBadRequest && strings.HasPrefix(errorDetail.Detail, invalidNonceError) {
+	if errorDetail.StatusCode == http.StatusBadRequest && errorDetail.Type == invalidNonceError {
 		return NonceError{errorDetail}
 	}
 
@@ -90,5 +74,5 @@ func handleHTTPError(resp *http.Response) error {
 }
 
 func handleChallengeError(chlng challenge) error {
-	return challengeError{chlng.Error, chlng.ValidationRecords}
+	return chlng.Error
 }

vendor/github.com/xenolf/lego/acme/http.go → vendor/github.com/xenolf/lego/acmev2/http.go

@@ -18,6 +18,7 @@ var UserAgent string
 // HTTPClient is an HTTP client with a reasonable timeout value.
 var HTTPClient = http.Client{
 	Transport: &http.Transport{
+		Proxy: http.ProxyFromEnvironment,
 		Dial: (&net.Dialer{
 			Timeout:   30 * time.Second,
 			KeepAlive: 30 * time.Second,
@@ -101,7 +102,7 @@ func getJSON(uri string, respBody interface{}) (http.Header, error) {
 func postJSON(j *jws, uri string, reqBody, respBody interface{}) (http.Header, error) {
 	jsonBytes, err := json.Marshal(reqBody)
 	if err != nil {
-		return nil, errors.New("Failed to marshal network message...")
+		return nil, errors.New("Failed to marshal network message")
 	}
 
 	resp, err := j.post(uri, jsonBytes)

vendor/github.com/xenolf/lego/acme/http_challenge.go → vendor/github.com/xenolf/lego/acmev2/http_challenge.go

@@ -37,5 +37,5 @@ func (s *httpChallenge) Solve(chlng challenge, domain string) error {
 		}
 	}()
 
-	return s.validate(s.jws, domain, chlng.URI, challenge{Resource: "challenge", Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
+	return s.validate(s.jws, domain, chlng.URL, challenge{Type: chlng.Type, Token: chlng.Token, KeyAuthorization: keyAuth})
 }

vendor/github.com/xenolf/lego/acme/jws.go → vendor/github.com/xenolf/lego/acmev2/jws.go

@@ -10,37 +10,27 @@ import (
 	"net/http"
 	"sync"
 
-	"gopkg.in/square/go-jose.v1"
+	"gopkg.in/square/go-jose.v2"
 )
 
 type jws struct {
-	directoryURL string
+	getNonceURL string
 	privKey     crypto.PrivateKey
+	kid         string
 	nonces      nonceManager
 }
 
-func keyAsJWK(key interface{}) *jose.JsonWebKey {
-	switch k := key.(type) {
-	case *ecdsa.PublicKey:
-		return &jose.JsonWebKey{Key: k, Algorithm: "EC"}
-	case *rsa.PublicKey:
-		return &jose.JsonWebKey{Key: k, Algorithm: "RSA"}
-
-	default:
-		return nil
-	}
-}
-
 // Posts a JWS signed message to the specified URL.
 // It does NOT close the response body, so the caller must
 // do that if no error was returned.
 func (j *jws) post(url string, content []byte) (*http.Response, error) {
-	signedContent, err := j.signContent(content)
+	signedContent, err := j.signContent(url, content)
 	if err != nil {
 		return nil, fmt.Errorf("Failed to sign content -> %s", err.Error())
 	}
 
-	resp, err := httpPost(url, "application/jose+json", bytes.NewBuffer([]byte(signedContent.FullSerialize())))
+	data := bytes.NewBuffer([]byte(signedContent.FullSerialize()))
+	resp, err := httpPost(url, "application/jose+json", data)
 	if err != nil {
 		return nil, fmt.Errorf("Failed to HTTP POST to %s -> %s", url, err.Error())
 	}
@@ -53,7 +43,7 @@ func (j *jws) post(url string, content []byte) (*http.Response, error) {
 	return resp, nil
 }
 
-func (j *jws) signContent(content []byte) (*jose.JsonWebSignature, error) {
+func (j *jws) signContent(url string, content []byte) (*jose.JSONWebSignature, error) {
 
 	var alg jose.SignatureAlgorithm
 	switch k := j.privKey.(type) {
@@ -67,11 +57,28 @@ func (j *jws) signContent(content []byte) (*jose.JsonWebSignature, error) {
 		}
 	}
 
-	signer, err := jose.NewSigner(alg, j.privKey)
+	jsonKey := jose.JSONWebKey{
+		Key:   j.privKey,
+		KeyID: j.kid,
+	}
+
+	signKey := jose.SigningKey{
+		Algorithm: alg,
+		Key:       jsonKey,
+	}
+	options := jose.SignerOptions{
+		NonceSource:  j,
+		ExtraHeaders: make(map[jose.HeaderKey]interface{}),
+	}
+	options.ExtraHeaders["url"] = url
+	if j.kid == "" {
+		options.EmbedJWK = true
+	}
+
+	signer, err := jose.NewSigner(signKey, &options)
 	if err != nil {
 		return nil, fmt.Errorf("Failed to create jose signer -> %s", err.Error())
 	}
-	signer.SetNonceSource(j)
 
 	signed, err := signer.Sign(content)
 	if err != nil {
@@ -85,7 +92,7 @@ func (j *jws) Nonce() (string, error) {
 		return nonce, nil
 	}
 
-	return getNonce(j.directoryURL)
+	return getNonce(j.getNonceURL)
 }
 
 type nonceManager struct {
@@ -124,7 +131,7 @@ func getNonce(url string) (string, error) {
 func getNonceFromResponse(resp *http.Response) (string, error) {
 	nonce := resp.Header.Get("Replay-Nonce")
 	if nonce == "" {
-		return "", fmt.Errorf("Server did not respond with a proper nonce header.")
+		return "", fmt.Errorf("Server did not respond with a proper nonce header")
 	}
 
 	return nonce, nil

vendor/github.com/xenolf/lego/acmev2/messages.go

+package acme
+
+import (
+	"time"
+)
+
+// RegistrationResource represents all important informations about a registration
+// of which the client needs to keep track itself.
+type RegistrationResource struct {
+	Body accountMessage `json:"body,omitempty"`
+	URI  string         `json:"uri,omitempty"`
+}
+
+type directory struct {
+	NewNonceURL   string `json:"newNonce"`
+	NewAccountURL string `json:"newAccount"`
+	NewOrderURL   string `json:"newOrder"`
+	RevokeCertURL string `json:"revokeCert"`
+	KeyChangeURL  string `json:"keyChange"`
+	Meta          struct {
+		TermsOfService          string   `json:"termsOfService"`
+		Website                 string   `json:"website"`
+		CaaIdentities           []string `json:"caaIdentities"`
+		ExternalAccountRequired bool     `json:"externalAccountRequired"`
+	} `json:"meta"`
+}
+
+type accountMessage struct {
+	Status               string   `json:"status,omitempty"`
+	Contact              []string `json:"contact,omitempty"`
+	TermsOfServiceAgreed bool     `json:"termsOfServiceAgreed,omitempty"`
+	Orders               string   `json:"orders,omitempty"`
+	OnlyReturnExisting   bool     `json:"onlyReturnExisting,omitempty"`
+}
+
+type orderResource struct {
+	URL          string `json:"url,omitempty"`
+	orderMessage `json:"body,omitempty"`
+}
+
+type orderMessage struct {
+	Status         string       `json:"status,omitempty"`
+	Expires        string       `json:"expires,omitempty"`
+	Identifiers    []identifier `json:"identifiers"`
+	NotBefore      string       `json:"notBefore,omitempty"`
+	NotAfter       string       `json:"notAfter,omitempty"`
+	Authorizations []string     `json:"authorizations,omitempty"`
+	Finalize       string       `json:"finalize,omitempty"`
+	Certificate    string       `json:"certificate,omitempty"`
+}
+
+type authorization struct {
+	Status     string      `json:"status"`
+	Expires    time.Time   `json:"expires"`
+	Identifier identifier  `json:"identifier"`
+	Challenges []challenge `json:"challenges"`
+}
+
+type identifier struct {
+	Type  string `json:"type"`
+	Value string `json:"value"`
+}
+
+type challenge struct {
+	URL              string      `json:"url"`
+	Type             string      `json:"type"`
+	Status           string      `json:"status"`
+	Token            string      `json:"token"`
+	Validated        time.Time   `json:"validated"`
+	KeyAuthorization string      `json:"keyAuthorization"`
+	Error            RemoteError `json:"error"`
+}
+
+type csrMessage struct {
+	Csr string `json:"csr"`
+}
+
+type emptyObjectMessage struct {
+}
+
+type revokeCertMessage struct {
+	Certificate string `json:"certificate"`
+}
+
+type deactivateAuthMessage struct {
+	Status string `jsom:"status"`
+}
+
+// CertificateResource represents a CA issued certificate.
+// PrivateKey, Certificate and IssuerCertificate are all
+// already PEM encoded and can be directly written to disk.
+// Certificate may be a certificate bundle, depending on the
+// options supplied to create it.
+type CertificateResource struct {
+	Domain            string `json:"domain"`
+	CertURL           string `json:"certUrl"`
+	CertStableURL     string `json:"certStableUrl"`
+	AccountRef        string `json:"accountRef,omitempty"`
+	PrivateKey        []byte `json:"-"`
+	Certificate       []byte `json:"-"`
+	IssuerCertificate []byte `json:"-"`
+	CSR               []byte `json:"-"`
+}

vendor/golang.org/x/crypto/acme/acme.go

-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package acme provides an implementation of the
-// Automatic Certificate Management Environment (ACME) spec.
-// See https://tools.ietf.org/html/draft-ietf-acme-acme-02 for details.
-//
-// Most common scenarios will want to use autocert subdirectory instead,
-// which provides automatic access to certificates from Let's Encrypt
-// and any other ACME-based CA.
-//
-// This package is a work in progress and makes no API stability promises.
-package acme
-
-import (
-	"bytes"
-	"context"
-	"crypto"
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
-	"crypto/sha256"
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/base64"
-	"encoding/hex"
-	"encoding/json"
-	"encoding/pem"
-	"errors"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"math/big"
-	"net/http"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-)
-
-// LetsEncryptURL is the Directory endpoint of Let's Encrypt CA.
-const LetsEncryptURL = "https://acme-v01.api.letsencrypt.org/directory"
-
-const (
-	maxChainLen = 5       // max depth and breadth of a certificate chain
-	maxCertSize = 1 << 20 // max size of a certificate, in bytes
-
-	// Max number of collected nonces kept in memory.
-	// Expect usual peak of 1 or 2.
-	maxNonces = 100
-)
-
-// CertOption is an optional argument type for Client methods which manipulate
-// certificate data.
-type CertOption interface {
-	privateCertOpt()
-}
-
-// WithKey creates an option holding a private/public key pair.
-// The private part signs a certificate, and the public part represents the signee.
-func WithKey(key crypto.Signer) CertOption {
-	return &certOptKey{key}
-}
-
-type certOptKey struct {
-	key crypto.Signer
-}
-
-func (*certOptKey) privateCertOpt() {}
-
-// WithTemplate creates an option for specifying a certificate template.
-// See x509.CreateCertificate for template usage details.
-//
-// In TLSSNIxChallengeCert methods, the template is also used as parent,
-// resulting in a self-signed certificate.
-// The DNSNames field of t is always overwritten for tls-sni challenge certs.
-func WithTemplate(t *x509.Certificate) CertOption {
-	return (*certOptTemplate)(t)
-}
-
-type certOptTemplate x509.Certificate
-
-func (*certOptTemplate) privateCertOpt() {}
-
-// Client is an ACME client.
-// The only required field is Key. An example of creating a client with a new key
-// is as follows:
-//
-// 	key, err := rsa.GenerateKey(rand.Reader, 2048)
-// 	if err != nil {
-// 		log.Fatal(err)
-// 	}
-// 	client := &Client{Key: key}
-//
-type Client struct {
-	// Key is the account key used to register with a CA and sign requests.
-	// Key.Public() must return a *rsa.PublicKey or *ecdsa.PublicKey.
-	Key crypto.Signer
-
-	// HTTPClient optionally specifies an HTTP client to use
-	// instead of http.DefaultClient.
-	HTTPClient *http.Client
-
-	// DirectoryURL points to the CA directory endpoint.
-	// If empty, LetsEncryptURL is used.
-	// Mutating this value after a successful call of Client's Discover method
-	// will have no effect.
-	DirectoryURL string
-
-	dirMu sync.Mutex // guards writes to dir
-	dir   *Directory // cached result of Client's Discover method
-
-	noncesMu sync.Mutex
-	nonces   map[string]struct{} // nonces collected from previous responses
-}
-
-// Discover performs ACME server discovery using c.DirectoryURL.
-//
-// It caches successful result. So, subsequent calls will not result in
-// a network round-trip. This also means mutating c.DirectoryURL after successful call
-// of this method will have no effect.
-func (c *Client) Discover(ctx context.Context) (Directory, error) {
-	c.dirMu.Lock()
-	defer c.dirMu.Unlock()
-	if c.dir != nil {
-		return *c.dir, nil
-	}
-
-	dirURL := c.DirectoryURL
-	if dirURL == "" {
-		dirURL = LetsEncryptURL
-	}
-	res, err := c.get(ctx, dirURL)
-	if err != nil {
-		return Directory{}, err
-	}
-	defer res.Body.Close()
-	c.addNonce(res.Header)
-	if res.StatusCode != http.StatusOK {
-		return Directory{}, responseError(res)
-	}
-
-	var v struct {
-		Reg    string `json:"new-reg"`
-		Authz  string `json:"new-authz"`
-		Cert   string `json:"new-cert"`
-		Revoke string `json:"revoke-cert"`
-		Meta   struct {
-			Terms   string   `json:"terms-of-service"`
-			Website string   `json:"website"`
-			CAA     []string `json:"caa-identities"`
-		}
-	}
-	if err := json.NewDecoder(res.Body).Decode(&v); err != nil {
-		return Directory{}, err
-	}
-	c.dir = &Directory{
-		RegURL:    v.Reg,
-		AuthzURL:  v.Authz,
-		CertURL:   v.Cert,
-		RevokeURL: v.Revoke,
-		Terms:     v.Meta.Terms,
-		Website:   v.Meta.Website,
-		CAA:       v.Meta.CAA,
-	}
-	return *c.dir, nil
-}
-
-// CreateCert requests a new certificate using the Certificate Signing Request csr encoded in DER format.
-// The exp argument indicates the desired certificate validity duration. CA may issue a certificate
-// with a different duration.
-// If the bundle argument is true, the returned value will also contain the CA (issuer) certificate chain.
-//
-// In the case where CA server does not provide the issued certificate in the response,
-// CreateCert will poll certURL using c.FetchCert, which will result in additional round-trips.
-// In such scenario the caller can cancel the polling with ctx.
-//
-// CreateCert returns an error if the CA's response or chain was unreasonably large.
-// Callers are encouraged to parse the returned value to ensure the certificate is valid and has the expected features.
-func (c *Client) CreateCert(ctx context.Context, csr []byte, exp time.Duration, bundle bool) (der [][]byte, certURL string, err error) {
-	if _, err := c.Discover(ctx); err != nil {
-		return nil, "", err
-	}
-
-	req := struct {
-		Resource  string `json:"resource"`
-		CSR       string `json:"csr"`
-		NotBefore string `json:"notBefore,omitempty"`
-		NotAfter  string `json:"notAfter,omitempty"`
-	}{
-		Resource: "new-cert",
-		CSR:      base64.RawURLEncoding.EncodeToString(csr),
-	}
-	now := timeNow()
-	req.NotBefore = now.Format(time.RFC3339)
-	if exp > 0 {
-		req.NotAfter = now.Add(exp).Format(time.RFC3339)
-	}
-
-	res, err := c.retryPostJWS(ctx, c.Key, c.dir.CertURL, req)
-	if err != nil {
-		return nil, "", err
-	}
-	defer res.Body.Close()
-	if res.StatusCode != http.StatusCreated {
-		return nil, "", responseError(res)
-	}
-
-	curl := res.Header.Get("Location") // cert permanent URL
-	if res.ContentLength == 0 {
-		// no cert in the body; poll until we get it
-		cert, err := c.FetchCert(ctx, curl, bundle)
-		return cert, curl, err
-	}
-	// slurp issued cert and CA chain, if requested
-	cert, err := c.responseCert(ctx, res, bundle)
-	return cert, curl, err
-}
-
-// FetchCert retrieves already issued certificate from the given url, in DER format.
-// It retries the request until the certificate is successfully retrieved,
-// context is cancelled by the caller or an error response is received.
-//
-// The returned value will also contain the CA (issuer) certificate if the bundle argument is true.
-//
-// FetchCert returns an error if the CA's response or chain was unreasonably large.
-// Callers are encouraged to parse the returned value to ensure the certificate is valid
-// and has expected features.
-func (c *Client) FetchCert(ctx context.Context, url string, bundle bool) ([][]byte, error) {
-	for {
-		res, err := c.get(ctx, url)
-		if err != nil {
-			return nil, err
-		}
-		defer res.Body.Close()
-		if res.StatusCode == http.StatusOK {
-			return c.responseCert(ctx, res, bundle)
-		}
-		if res.StatusCode > 299 {
-			return nil, responseError(res)
-		}
-		d := retryAfter(res.Header.Get("Retry-After"), 3*time.Second)
-		select {
-		case <-time.After(d):
-			// retry
-		case <-ctx.Done():
-			return nil, ctx.Err()
-		}
-	}
-}
-
-// RevokeCert revokes a previously issued certificate cert, provided in DER format.
-//
-// The key argument, used to sign the request, must be authorized
-// to revoke the certificate. It's up to the CA to decide which keys are authorized.
-// For instance, the key pair of the certificate may be authorized.
-// If the key is nil, c.Key is used instead.
-func (c *Client) RevokeCert(ctx context.Context, key crypto.Signer, cert []byte, reason CRLReasonCode) error {
-	if _, err := c.Discover(ctx); err != nil {
-		return err
-	}
-
-	body := &struct {
-		Resource string `json:"resource"`
-		Cert     string `json:"certificate"`
-		Reason   int    `json:"reason"`
-	}{
-		Resource: "revoke-cert",
-		Cert:     base64.RawURLEncoding.EncodeToString(cert),
-		Reason:   int(reason),
-	}
-	if key == nil {
-		key = c.Key
-	}
-	res, err := c.retryPostJWS(ctx, key, c.dir.RevokeURL, body)
-	if err != nil {
-		return err
-	}
-	defer res.Body.Close()
-	if res.StatusCode != http.StatusOK {
-		return responseError(res)
-	}
-	return nil
-}
-
-// AcceptTOS always returns true to indicate the acceptance of a CA's Terms of Service
-// during account registration. See Register method of Client for more details.
-func AcceptTOS(tosURL string) bool { return true }
-
-// Register creates a new account registration by following the "new-reg" flow.
-// It returns registered account. The a argument is not modified.
-//
-// The registration may require the caller to agree to the CA's Terms of Service (TOS).
-// If so, and the account has not indicated the acceptance of the terms (see Account for details),
-// Register calls prompt with a TOS URL provided by the CA. Prompt should report
-// whether the caller agrees to the terms. To always accept the terms, the caller can use AcceptTOS.
-func (c *Client) Register(ctx context.Context, a *Account, prompt func(tosURL string) bool) (*Account, error) {
-	if _, err := c.Discover(ctx); err != nil {
-		return nil, err
-	}
-
-	var err error
-	if a, err = c.doReg(ctx, c.dir.RegURL, "new-reg", a); err != nil {
-		return nil, err
-	}
-	var accept bool
-	if a.CurrentTerms != "" && a.CurrentTerms != a.AgreedTerms {
-		accept = prompt(a.CurrentTerms)
-	}
-	if accept {
-		a.AgreedTerms = a.CurrentTerms
-		a, err = c.UpdateReg(ctx, a)
-	}
-	return a, err
-}
-
-// GetReg retrieves an existing registration.
-// The url argument is an Account URI.
-func (c *Client) GetReg(ctx context.Context, url string) (*Account, error) {
-	a, err := c.doReg(ctx, url, "reg", nil)
-	if err != nil {
-		return nil, err
-	}
-	a.URI = url
-	return a, nil
-}
-
-// UpdateReg updates an existing registration.
-// It returns an updated account copy. The provided account is not modified.
-func (c *Client) UpdateReg(ctx context.Context, a *Account) (*Account, error) {
-	uri := a.URI
-	a, err := c.doReg(ctx, uri, "reg", a)
-	if err != nil {
-		return nil, err
-	}
-	a.URI = uri
-	return a, nil
-}
-
-// Authorize performs the initial step in an authorization flow.
-// The caller will then need to choose from and perform a set of returned
-// challenges using c.Accept in order to successfully complete authorization.
-//
-// If an authorization has been previously granted, the CA may return
-// a valid authorization (Authorization.Status is StatusValid). If so, the caller
-// need not fulfill any challenge and can proceed to requesting a certificate.
-func (c *Client) Authorize(ctx context.Context, domain string) (*Authorization, error) {
-	if _, err := c.Discover(ctx); err != nil {
-		return nil, err
-	}
-
-	type authzID struct {
-		Type  string `json:"type"`
-		Value string `json:"value"`
-	}
-	req := struct {
-		Resource   string  `json:"resource"`
-		Identifier authzID `json:"identifier"`
-	}{
-		Resource:   "new-authz",
-		Identifier: authzID{Type: "dns", Value: domain},
-	}
-	res, err := c.retryPostJWS(ctx, c.Key, c.dir.AuthzURL, req)
-	if err != nil {
-		return nil, err
-	}
-	defer res.Body.Close()
-	if res.StatusCode != http.StatusCreated {
-		return nil, responseError(res)
-	}
-
-	var v wireAuthz
-	if err := json.NewDecoder(res.Body).Decode(&v); err != nil {
-		return nil, fmt.Errorf("acme: invalid response: %v", err)
-	}
-	if v.Status != StatusPending && v.Status != StatusValid {
-		return nil, fmt.Errorf("acme: unexpected status: %s", v.Status)
-	}
-	return v.authorization(res.Header.Get("Location")), nil
-}
-
-// GetAuthorization retrieves an authorization identified by the given URL.
-//
-// If a caller needs to poll an authorization until its status is final,
-// see the WaitAuthorization method.
-func (c *Client) GetAuthorization(ctx context.Context, url string) (*Authorization, error) {
-	res, err := c.get(ctx, url)
-	if err != nil {
-		return nil, err
-	}
-	defer res.Body.Close()
-	if res.StatusCode != http.StatusOK && res.StatusCode != http.StatusAccepted {
-		return nil, responseError(res)
-	}
-	var v wireAuthz
-	if err := json.NewDecoder(res.Body).Decode(&v); err != nil {
-		return nil, fmt.Errorf("acme: invalid response: %v", err)
-	}
-	return v.authorization(url), nil
-}
-
-// RevokeAuthorization relinquishes an existing authorization identified
-// by the given URL.
-// The url argument is an Authorization.URI value.
-//
-// If successful, the caller will be required to obtain a new authorization
-// using the Authorize method before being able to request a new certificate
-// for the domain associated with the authorization.
-//
-// It does not revoke existing certificates.
-func (c *Client) RevokeAuthorization(ctx context.Context, url string) error {
-	req := struct {
-		Resource string `json:"resource"`
-		Status   string `json:"status"`
-		Delete   bool   `json:"delete"`
-	}{
-		Resource: "authz",
-		Status:   "deactivated",
-		Delete:   true,
-	}
-	res, err := c.retryPostJWS(ctx, c.Key, url, req)
-	if err != nil {
-		return err
-	}
-	defer res.Body.Close()
-	if res.StatusCode != http.StatusOK {
-		return responseError(res)
-	}
-	return nil
-}
-
-// WaitAuthorization polls an authorization at the given URL
-// until it is in one of the final states, StatusValid or StatusInvalid,
-// or the context is done.
-//
-// It returns a non-nil Authorization only if its Status is StatusValid.
-// In all other cases WaitAuthorization returns an error.
-// If the Status is StatusInvalid, the returned error is of type *AuthorizationError.
-func (c *Client) WaitAuthorization(ctx context.Context, url string) (*Authorization, error) {
-	sleep := sleeper(ctx)
-	for {
-		res, err := c.get(ctx, url)
-		if err != nil {
-			return nil, err
-		}
-		retry := res.Header.Get("Retry-After")
-		if res.StatusCode != http.StatusOK && res.StatusCode != http.StatusAccepted {
-			res.Body.Close()
-			if err := sleep(retry, 1); err != nil {
-				return nil, err
-			}
-			continue
-		}
-		var raw wireAuthz
-		err = json.NewDecoder(res.Body).Decode(&raw)
-		res.Body.Close()
-		if err != nil {
-			if err := sleep(retry, 0); err != nil {
-				return nil, err
-			}
-			continue
-		}
-		if raw.Status == StatusValid {
-			return raw.authorization(url), nil
-		}
-		if raw.Status == StatusInvalid {
-			return nil, raw.error(url)
-		}
-		if err := sleep(retry, 0); err != nil {
-			return nil, err
-		}
-	}
-}
-
-// GetChallenge retrieves the current status of an challenge.
-//
-// A client typically polls a challenge status using this method.
-func (c *Client) GetChallenge(ctx context.Context, url string) (*Challenge, error) {
-	res, err := c.get(ctx, url)
-	if err != nil {
-		return nil, err
-	}
-	defer res.Body.Close()
-	if res.StatusCode != http.StatusOK && res.StatusCode != http.StatusAccepted {
-		return nil, responseError(res)
-	}
-	v := wireChallenge{URI: url}
-	if err := json.NewDecoder(res.Body).Decode(&v); err != nil {
-		return nil, fmt.Errorf("acme: invalid response: %v", err)
-	}
-	return v.challenge(), nil
-}
-
-// Accept informs the server that the client accepts one of its challenges
-// previously obtained with c.Authorize.
-//
-// The server will then perform the validation asynchronously.
-func (c *Client) Accept(ctx context.Context, chal *Challenge) (*Challenge, error) {
-	auth, err := keyAuth(c.Key.Public(), chal.Token)
-	if err != nil {
-		return nil, err
-	}
-
-	req := struct {
-		Resource string `json:"resource"`
-		Type     string `json:"type"`
-		Auth     string `json:"keyAuthorization"`
-	}{
-		Resource: "challenge",
-		Type:     chal.Type,
-		Auth:     auth,
-	}
-	res, err := c.retryPostJWS(ctx, c.Key, chal.URI, req)
-	if err != nil {
-		return nil, err
-	}
-	defer res.Body.Close()
-	// Note: the protocol specifies 200 as the expected response code, but
-	// letsencrypt seems to be returning 202.
-	if res.StatusCode != http.StatusOK && res.StatusCode != http.StatusAccepted {
-		return nil, responseError(res)
-	}
-
-	var v wireChallenge
-	if err := json.NewDecoder(res.Body).Decode(&v); err != nil {
-		return nil, fmt.Errorf("acme: invalid response: %v", err)
-	}
-	return v.challenge(), nil
-}
-
-// DNS01ChallengeRecord returns a DNS record value for a dns-01 challenge response.
-// A TXT record containing the returned value must be provisioned under
-// "_acme-challenge" name of the domain being validated.
-//
-// The token argument is a Challenge.Token value.
-func (c *Client) DNS01ChallengeRecord(token string) (string, error) {
-	ka, err := keyAuth(c.Key.Public(), token)
-	if err != nil {
-		return "", err
-	}
-	b := sha256.Sum256([]byte(ka))
-	return base64.RawURLEncoding.EncodeToString(b[:]), nil
-}
-
-// HTTP01ChallengeResponse returns the response for an http-01 challenge.
-// Servers should respond with the value to HTTP requests at the URL path
-// provided by HTTP01ChallengePath to validate the challenge and prove control
-// over a domain name.
-//
-// The token argument is a Challenge.Token value.
-func (c *Client) HTTP01ChallengeResponse(token string) (string, error) {
-	return keyAuth(c.Key.Public(), token)
-}
-
-// HTTP01ChallengePath returns the URL path at which the response for an http-01 challenge
-// should be provided by the servers.
-// The response value can be obtained with HTTP01ChallengeResponse.
-//
-// The token argument is a Challenge.Token value.
-func (c *Client) HTTP01ChallengePath(token string) string {
-	return "/.well-known/acme-challenge/" + token
-}
-
-// TLSSNI01ChallengeCert creates a certificate for TLS-SNI-01 challenge response.
-// Servers can present the certificate to validate the challenge and prove control
-// over a domain name.
-//
-// The implementation is incomplete in that the returned value is a single certificate,
-// computed only for Z0 of the key authorization. ACME CAs are expected to update
-// their implementations to use the newer version, TLS-SNI-02.
-// For more details on TLS-SNI-01 see https://tools.ietf.org/html/draft-ietf-acme-acme-01#section-7.3.
-//
-// The token argument is a Challenge.Token value.
-// If a WithKey option is provided, its private part signs the returned cert,
-// and the public part is used to specify the signee.
-// If no WithKey option is provided, a new ECDSA key is generated using P-256 curve.
-//
-// The returned certificate is valid for the next 24 hours and must be presented only when
-// the server name of the client hello matches exactly the returned name value.
-func (c *Client) TLSSNI01ChallengeCert(token string, opt ...CertOption) (cert tls.Certificate, name string, err error) {
-	ka, err := keyAuth(c.Key.Public(), token)
-	if err != nil {
-		return tls.Certificate{}, "", err
-	}
-	b := sha256.Sum256([]byte(ka))
-	h := hex.EncodeToString(b[:])
-	name = fmt.Sprintf("%s.%s.acme.invalid", h[:32], h[32:])
-	cert, err = tlsChallengeCert([]string{name}, opt)
-	if err != nil {
-		return tls.Certificate{}, "", err
-	}
-	return cert, name, nil
-}
-
-// TLSSNI02ChallengeCert creates a certificate for TLS-SNI-02 challenge response.
-// Servers can present the certificate to validate the challenge and prove control
-// over a domain name. For more details on TLS-SNI-02 see
-// https://tools.ietf.org/html/draft-ietf-acme-acme-03#section-7.3.
-//
-// The token argument is a Challenge.Token value.
-// If a WithKey option is provided, its private part signs the returned cert,
-// and the public part is used to specify the signee.
-// If no WithKey option is provided, a new ECDSA key is generated using P-256 curve.
-//
-// The returned certificate is valid for the next 24 hours and must be presented only when
-// the server name in the client hello matches exactly the returned name value.
-func (c *Client) TLSSNI02ChallengeCert(token string, opt ...CertOption) (cert tls.Certificate, name string, err error) {
-	b := sha256.Sum256([]byte(token))
-	h := hex.EncodeToString(b[:])
-	sanA := fmt.Sprintf("%s.%s.token.acme.invalid", h[:32], h[32:])
-
-	ka, err := keyAuth(c.Key.Public(), token)
-	if err != nil {
-		return tls.Certificate{}, "", err
-	}
-	b = sha256.Sum256([]byte(ka))
-	h = hex.EncodeToString(b[:])
-	sanB := fmt.Sprintf("%s.%s.ka.acme.invalid", h[:32], h[32:])
-
-	cert, err = tlsChallengeCert([]string{sanA, sanB}, opt)
-	if err != nil {
-		return tls.Certificate{}, "", err
-	}
-	return cert, sanA, nil
-}
-
-// doReg sends all types of registration requests.
-// The type of request is identified by typ argument, which is a "resource"
-// in the ACME spec terms.
-//
-// A non-nil acct argument indicates whether the intention is to mutate data
-// of the Account. Only Contact and Agreement of its fields are used
-// in such cases.
-func (c *Client) doReg(ctx context.Context, url string, typ string, acct *Account) (*Account, error) {
-	req := struct {
-		Resource  string   `json:"resource"`
-		Contact   []string `json:"contact,omitempty"`
-		Agreement string   `json:"agreement,omitempty"`
-	}{
-		Resource: typ,
-	}
-	if acct != nil {
-		req.Contact = acct.Contact
-		req.Agreement = acct.AgreedTerms
-	}
-	res, err := c.retryPostJWS(ctx, c.Key, url, req)
-	if err != nil {
-		return nil, err
-	}
-	defer res.Body.Close()
-	if res.StatusCode < 200 || res.StatusCode > 299 {
-		return nil, responseError(res)
-	}
-
-	var v struct {
-		Contact        []string
-		Agreement      string
-		Authorizations string
-		Certificates   string
-	}
-	if err := json.NewDecoder(res.Body).Decode(&v); err != nil {
-		return nil, fmt.Errorf("acme: invalid response: %v", err)
-	}
-	var tos string
-	if v := linkHeader(res.Header, "terms-of-service"); len(v) > 0 {
-		tos = v[0]
-	}
-	var authz string
-	if v := linkHeader(res.Header, "next"); len(v) > 0 {
-		authz = v[0]
-	}
-	return &Account{
-		URI:            res.Header.Get("Location"),
-		Contact:        v.Contact,
-		AgreedTerms:    v.Agreement,
-		CurrentTerms:   tos,
-		Authz:          authz,
-		Authorizations: v.Authorizations,
-		Certificates:   v.Certificates,
-	}, nil
-}
-
-// retryPostJWS will retry calls to postJWS if there is a badNonce error,
-// clearing the stored nonces after each error.
-// If the response was 4XX-5XX, then responseError is called on the body,
-// the body is closed, and the error returned.
-func (c *Client) retryPostJWS(ctx context.Context, key crypto.Signer, url string, body interface{}) (*http.Response, error) {
-	sleep := sleeper(ctx)
-	for {
-		res, err := c.postJWS(ctx, key, url, body)
-		if err != nil {
-			return nil, err
-		}
-		// handle errors 4XX-5XX with responseError
-		if res.StatusCode >= 400 && res.StatusCode <= 599 {
-			err := responseError(res)
-			res.Body.Close()
-			// according to spec badNonce is urn:ietf:params:acme:error:badNonce
-			// however, acme servers in the wild return their version of the error
-			// https://tools.ietf.org/html/draft-ietf-acme-acme-02#section-5.4
-			if ae, ok := err.(*Error); ok && strings.HasSuffix(strings.ToLower(ae.ProblemType), ":badnonce") {
-				// clear any nonces that we might've stored that might now be
-				// considered bad
-				c.clearNonces()
-				retry := res.Header.Get("Retry-After")
-				if err := sleep(retry, 1); err != nil {
-					return nil, err
-				}
-				continue
-			}
-			return nil, err
-		}
-		return res, nil
-	}
-}
-
-// postJWS signs the body with the given key and POSTs it to the provided url.
-// The body argument must be JSON-serializable.
-func (c *Client) postJWS(ctx context.Context, key crypto.Signer, url string, body interface{}) (*http.Response, error) {
-	nonce, err := c.popNonce(ctx, url)
-	if err != nil {
-		return nil, err
-	}
-	b, err := jwsEncodeJSON(body, key, nonce)
-	if err != nil {
-		return nil, err
-	}
-	res, err := c.post(ctx, url, "application/jose+json", bytes.NewReader(b))
-	if err != nil {
-		return nil, err
-	}
-	c.addNonce(res.Header)
-	return res, nil
-}
-
-// popNonce returns a nonce value previously stored with c.addNonce
-// or fetches a fresh one from the given URL.
-func (c *Client) popNonce(ctx context.Context, url string) (string, error) {
-	c.noncesMu.Lock()
-	defer c.noncesMu.Unlock()
-	if len(c.nonces) == 0 {
-		return c.fetchNonce(ctx, url)
-	}
-	var nonce string
-	for nonce = range c.nonces {
-		delete(c.nonces, nonce)
-		break
-	}
-	return nonce, nil
-}
-
-// clearNonces clears any stored nonces
-func (c *Client) clearNonces() {
-	c.noncesMu.Lock()
-	defer c.noncesMu.Unlock()
-	c.nonces = make(map[string]struct{})
-}
-
-// addNonce stores a nonce value found in h (if any) for future use.
-func (c *Client) addNonce(h http.Header) {
-	v := nonceFromHeader(h)
-	if v == "" {
-		return
-	}
-	c.noncesMu.Lock()
-	defer c.noncesMu.Unlock()
-	if len(c.nonces) >= maxNonces {
-		return
-	}
-	if c.nonces == nil {
-		c.nonces = make(map[string]struct{})
-	}
-	c.nonces[v] = struct{}{}
-}
-
-func (c *Client) httpClient() *http.Client {
-	if c.HTTPClient != nil {
-		return c.HTTPClient
-	}
-	return http.DefaultClient
-}
-
-func (c *Client) get(ctx context.Context, urlStr string) (*http.Response, error) {
-	req, err := http.NewRequest("GET", urlStr, nil)
-	if err != nil {
-		return nil, err
-	}
-	return c.do(ctx, req)
-}
-
-func (c *Client) head(ctx context.Context, urlStr string) (*http.Response, error) {
-	req, err := http.NewRequest("HEAD", urlStr, nil)
-	if err != nil {
-		return nil, err
-	}
-	return c.do(ctx, req)
-}
-
-func (c *Client) post(ctx context.Context, urlStr, contentType string, body io.Reader) (*http.Response, error) {
-	req, err := http.NewRequest("POST", urlStr, body)
-	if err != nil {
-		return nil, err
-	}
-	req.Header.Set("Content-Type", contentType)
-	return c.do(ctx, req)
-}
-
-func (c *Client) do(ctx context.Context, req *http.Request) (*http.Response, error) {
-	res, err := c.httpClient().Do(req.WithContext(ctx))
-	if err != nil {
-		select {
-		case <-ctx.Done():
-			// Prefer the unadorned context error.
-			// (The acme package had tests assuming this, previously from ctxhttp's
-			// behavior, predating net/http supporting contexts natively)
-			// TODO(bradfitz): reconsider this in the future. But for now this
-			// requires no test updates.
-			return nil, ctx.Err()
-		default:
-			return nil, err
-		}
-	}
-	return res, nil
-}
-
-func (c *Client) fetchNonce(ctx context.Context, url string) (string, error) {
-	resp, err := c.head(ctx, url)
-	if err != nil {
-		return "", err
-	}
-	defer resp.Body.Close()
-	nonce := nonceFromHeader(resp.Header)
-	if nonce == "" {
-		if resp.StatusCode > 299 {
-			return "", responseError(resp)
-		}
-		return "", errors.New("acme: nonce not found")
-	}
-	return nonce, nil
-}
-
-func nonceFromHeader(h http.Header) string {
-	return h.Get("Replay-Nonce")
-}
-
-func (c *Client) responseCert(ctx context.Context, res *http.Response, bundle bool) ([][]byte, error) {
-	b, err := ioutil.ReadAll(io.LimitReader(res.Body, maxCertSize+1))
-	if err != nil {
-		return nil, fmt.Errorf("acme: response stream: %v", err)
-	}
-	if len(b) > maxCertSize {
-		return nil, errors.New("acme: certificate is too big")
-	}
-	cert := [][]byte{b}
-	if !bundle {
-		return cert, nil
-	}
-
-	// Append CA chain cert(s).
-	// At least one is required according to the spec:
-	// https://tools.ietf.org/html/draft-ietf-acme-acme-03#section-6.3.1
-	up := linkHeader(res.Header, "up")
-	if len(up) == 0 {
-		return nil, errors.New("acme: rel=up link not found")
-	}
-	if len(up) > maxChainLen {
-		return nil, errors.New("acme: rel=up link is too large")
-	}
-	for _, url := range up {
-		cc, err := c.chainCert(ctx, url, 0)
-		if err != nil {
-			return nil, err
-		}
-		cert = append(cert, cc...)
-	}
-	return cert, nil
-}
-
-// responseError creates an error of Error type from resp.
-func responseError(resp *http.Response) error {
-	// don't care if ReadAll returns an error:
-	// json.Unmarshal will fail in that case anyway
-	b, _ := ioutil.ReadAll(resp.Body)
-	e := &wireError{Status: resp.StatusCode}
-	if err := json.Unmarshal(b, e); err != nil {
-		// this is not a regular error response:
-		// populate detail with anything we received,
-		// e.Status will already contain HTTP response code value
-		e.Detail = string(b)
-		if e.Detail == "" {
-			e.Detail = resp.Status
-		}
-	}
-	return e.error(resp.Header)
-}
-
-// chainCert fetches CA certificate chain recursively by following "up" links.
-// Each recursive call increments the depth by 1, resulting in an error
-// if the recursion level reaches maxChainLen.
-//
-// First chainCert call starts with depth of 0.
-func (c *Client) chainCert(ctx context.Context, url string, depth int) ([][]byte, error) {
-	if depth >= maxChainLen {
-		return nil, errors.New("acme: certificate chain is too deep")
-	}
-
-	res, err := c.get(ctx, url)
-	if err != nil {
-		return nil, err
-	}
-	defer res.Body.Close()
-	if res.StatusCode != http.StatusOK {
-		return nil, responseError(res)
-	}
-	b, err := ioutil.ReadAll(io.LimitReader(res.Body, maxCertSize+1))
-	if err != nil {
-		return nil, err
-	}
-	if len(b) > maxCertSize {
-		return nil, errors.New("acme: certificate is too big")
-	}
-	chain := [][]byte{b}
-
-	uplink := linkHeader(res.Header, "up")
-	if len(uplink) > maxChainLen {
-		return nil, errors.New("acme: certificate chain is too large")
-	}
-	for _, up := range uplink {
-		cc, err := c.chainCert(ctx, up, depth+1)
-		if err != nil {
-			return nil, err
-		}
-		chain = append(chain, cc...)
-	}
-
-	return chain, nil
-}
-
-// linkHeader returns URI-Reference values of all Link headers
-// with relation-type rel.
-// See https://tools.ietf.org/html/rfc5988#section-5 for details.
-func linkHeader(h http.Header, rel string) []string {
-	var links []string
-	for _, v := range h["Link"] {
-		parts := strings.Split(v, ";")
-		for _, p := range parts {
-			p = strings.TrimSpace(p)
-			if !strings.HasPrefix(p, "rel=") {
-				continue
-			}
-			if v := strings.Trim(p[4:], `"`); v == rel {
-				links = append(links, strings.Trim(parts[0], "<>"))
-			}
-		}
-	}
-	return links
-}
-
-// sleeper returns a function that accepts the Retry-After HTTP header value
-// and an increment that's used with backoff to increasingly sleep on
-// consecutive calls until the context is done. If the Retry-After header
-// cannot be parsed, then backoff is used with a maximum sleep time of 10
-// seconds.
-func sleeper(ctx context.Context) func(ra string, inc int) error {
-	var count int
-	return func(ra string, inc int) error {
-		count += inc
-		d := backoff(count, 10*time.Second)
-		d = retryAfter(ra, d)
-		wakeup := time.NewTimer(d)
-		defer wakeup.Stop()
-		select {
-		case <-ctx.Done():
-			return ctx.Err()
-		case <-wakeup.C:
-			return nil
-		}
-	}
-}
-
-// retryAfter parses a Retry-After HTTP header value,
-// trying to convert v into an int (seconds) or use http.ParseTime otherwise.
-// It returns d if v cannot be parsed.
-func retryAfter(v string, d time.Duration) time.Duration {
-	if i, err := strconv.Atoi(v); err == nil {
-		return time.Duration(i) * time.Second
-	}
-	t, err := http.ParseTime(v)
-	if err != nil {
-		return d
-	}
-	return t.Sub(timeNow())
-}
-
-// backoff computes a duration after which an n+1 retry iteration should occur
-// using truncated exponential backoff algorithm.
-//
-// The n argument is always bounded between 0 and 30.
-// The max argument defines upper bound for the returned value.
-func backoff(n int, max time.Duration) time.Duration {
-	if n < 0 {
-		n = 0
-	}
-	if n > 30 {
-		n = 30
-	}
-	var d time.Duration
-	if x, err := rand.Int(rand.Reader, big.NewInt(1000)); err == nil {
-		d = time.Duration(x.Int64()) * time.Millisecond
-	}
-	d += time.Duration(1<<uint(n)) * time.Second
-	if d > max {
-		return max
-	}
-	return d
-}
-
-// keyAuth generates a key authorization string for a given token.
-func keyAuth(pub crypto.PublicKey, token string) (string, error) {
-	th, err := JWKThumbprint(pub)
-	if err != nil {
-		return "", err
-	}
-	return fmt.Sprintf("%s.%s", token, th), nil
-}
-
-// tlsChallengeCert creates a temporary certificate for TLS-SNI challenges
-// with the given SANs and auto-generated public/private key pair.
-// To create a cert with a custom key pair, specify WithKey option.
-func tlsChallengeCert(san []string, opt []CertOption) (tls.Certificate, error) {
-	var (
-		key  crypto.Signer
-		tmpl *x509.Certificate
-	)
-	for _, o := range opt {
-		switch o := o.(type) {
-		case *certOptKey:
-			if key != nil {
-				return tls.Certificate{}, errors.New("acme: duplicate key option")
-			}
-			key = o.key
-		case *certOptTemplate:
-			var t = *(*x509.Certificate)(o) // shallow copy is ok
-			tmpl = &t
-		default:
-			// package's fault, if we let this happen:
-			panic(fmt.Sprintf("unsupported option type %T", o))
-		}
-	}
-	if key == nil {
-		var err error
-		if key, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader); err != nil {
-			return tls.Certificate{}, err
-		}
-	}
-	if tmpl == nil {
-		tmpl = &x509.Certificate{
-			SerialNumber:          big.NewInt(1),
-			NotBefore:             time.Now(),
-			NotAfter:              time.Now().Add(24 * time.Hour),
-			BasicConstraintsValid: true,
-			KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
-			ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
-		}
-	}
-	tmpl.DNSNames = san
-
-	der, err := x509.CreateCertificate(rand.Reader, tmpl, tmpl, key.Public(), key)
-	if err != nil {
-		return tls.Certificate{}, err
-	}
-	return tls.Certificate{
-		Certificate: [][]byte{der},
-		PrivateKey:  key,
-	}, nil
-}
-
-// encodePEM returns b encoded as PEM with block of type typ.
-func encodePEM(typ string, b []byte) []byte {
-	pb := &pem.Block{Type: typ, Bytes: b}
-	return pem.EncodeToMemory(pb)
-}
-
-// timeNow is useful for testing for fixed current time.
-var timeNow = time.Now

vendor/golang.org/x/crypto/acme/autocert/autocert.go

-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package autocert provides automatic access to certificates from Let's Encrypt
-// and any other ACME-based CA.
-//
-// This package is a work in progress and makes no API stability promises.
-package autocert
-
-import (
-	"bytes"
-	"context"
-	"crypto"
-	"crypto/ecdsa"
-	"crypto/elliptic"
-	"crypto/rand"
-	"crypto/rsa"
-	"crypto/tls"
-	"crypto/x509"
-	"crypto/x509/pkix"
-	"encoding/pem"
-	"errors"
-	"fmt"
-	"io"
-	mathrand "math/rand"
-	"net/http"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-
-	"golang.org/x/crypto/acme"
-)
-
-// createCertRetryAfter is how much time to wait before removing a failed state
-// entry due to an unsuccessful createCert call.
-// This is a variable instead of a const for testing.
-// TODO: Consider making it configurable or an exp backoff?
-var createCertRetryAfter = time.Minute
-
-// pseudoRand is safe for concurrent use.
-var pseudoRand *lockedMathRand
-
-func init() {
-	src := mathrand.NewSource(timeNow().UnixNano())
-	pseudoRand = &lockedMathRand{rnd: mathrand.New(src)}
-}
-
-// AcceptTOS is a Manager.Prompt function that always returns true to
-// indicate acceptance of the CA's Terms of Service during account
-// registration.
-func AcceptTOS(tosURL string) bool { return true }
-
-// HostPolicy specifies which host names the Manager is allowed to respond to.
-// It returns a non-nil error if the host should be rejected.
-// The returned error is accessible via tls.Conn.Handshake and its callers.
-// See Manager's HostPolicy field and GetCertificate method docs for more details.
-type HostPolicy func(ctx context.Context, host string) error
-
-// HostWhitelist returns a policy where only the specified host names are allowed.
-// Only exact matches are currently supported. Subdomains, regexp or wildcard
-// will not match.
-func HostWhitelist(hosts ...string) HostPolicy {
-	whitelist := make(map[string]bool, len(hosts))
-	for _, h := range hosts {
-		whitelist[h] = true
-	}
-	return func(_ context.Context, host string) error {
-		if !whitelist[host] {
-			return errors.New("acme/autocert: host not configured")
-		}
-		return nil
-	}
-}
-
-// defaultHostPolicy is used when Manager.HostPolicy is not set.
-func defaultHostPolicy(context.Context, string) error {
-	return nil
-}
-
-// Manager is a stateful certificate manager built on top of acme.Client.
-// It obtains and refreshes certificates automatically,
-// as well as providing them to a TLS server via tls.Config.
-//
-// To preserve issued certificates and improve overall performance,
-// use a cache implementation of Cache. For instance, DirCache.
-type Manager struct {
-	// Prompt specifies a callback function to conditionally accept a CA's Terms of Service (TOS).
-	// The registration may require the caller to agree to the CA's TOS.
-	// If so, Manager calls Prompt with a TOS URL provided by the CA. Prompt should report
-	// whether the caller agrees to the terms.
-	//
-	// To always accept the terms, the callers can use AcceptTOS.
-	Prompt func(tosURL string) bool
-
-	// Cache optionally stores and retrieves previously-obtained certificates.
-	// If nil, certs will only be cached for the lifetime of the Manager.
-	//
-	// Manager passes the Cache certificates data encoded in PEM, with private/public
-	// parts combined in a single Cache.Put call, private key first.
-	Cache Cache
-
-	// HostPolicy controls which domains the Manager will attempt
-	// to retrieve new certificates for. It does not affect cached certs.
-	//
-	// If non-nil, HostPolicy is called before requesting a new cert.
-	// If nil, all hosts are currently allowed. This is not recommended,
-	// as it opens a potential attack where clients connect to a server
-	// by IP address and pretend to be asking for an incorrect host name.
-	// Manager will attempt to obtain a certificate for that host, incorrectly,
-	// eventually reaching the CA's rate limit for certificate requests
-	// and making it impossible to obtain actual certificates.
-	//
-	// See GetCertificate for more details.
-	HostPolicy HostPolicy
-
-	// RenewBefore optionally specifies how early certificates should
-	// be renewed before they expire.
-	//
-	// If zero, they're renewed 30 days before expiration.
-	RenewBefore time.Duration
-
-	// Client is used to perform low-level operations, such as account registration
-	// and requesting new certificates.
-	// If Client is nil, a zero-value acme.Client is used with acme.LetsEncryptURL
-	// directory endpoint and a newly-generated ECDSA P-256 key.
-	//
-	// Mutating the field after the first call of GetCertificate method will have no effect.
-	Client *acme.Client
-
-	// Email optionally specifies a contact email address.
-	// This is used by CAs, such as Let's Encrypt, to notify about problems
-	// with issued certificates.
-	//
-	// If the Client's account key is already registered, Email is not used.
-	Email string
-
-	// ForceRSA makes the Manager generate certificates with 2048-bit RSA keys.
-	//
-	// If false, a default is used. Currently the default
-	// is EC-based keys using the P-256 curve.
-	ForceRSA bool
-
-	clientMu sync.Mutex
-	client   *acme.Client // initialized by acmeClient method
-
-	stateMu sync.Mutex
-	state   map[string]*certState // keyed by domain name
-
-	// tokenCert is keyed by token domain name, which matches server name
-	// of ClientHello. Keys always have ".acme.invalid" suffix.
-	tokenCertMu sync.RWMutex
-	tokenCert   map[string]*tls.Certificate
-
-	// renewal tracks the set of domains currently running renewal timers.
-	// It is keyed by domain name.
-	renewalMu sync.Mutex
-	renewal   map[string]*domainRenewal
-}
-
-// GetCertificate implements the tls.Config.GetCertificate hook.
-// It provides a TLS certificate for hello.ServerName host, including answering
-// *.acme.invalid (TLS-SNI) challenges. All other fields of hello are ignored.
-//
-// If m.HostPolicy is non-nil, GetCertificate calls the policy before requesting
-// a new cert. A non-nil error returned from m.HostPolicy halts TLS negotiation.
-// The error is propagated back to the caller of GetCertificate and is user-visible.
-// This does not affect cached certs. See HostPolicy field description for more details.
-func (m *Manager) GetCertificate(hello *tls.ClientHelloInfo) (*tls.Certificate, error) {
-	if m.Prompt == nil {
-		return nil, errors.New("acme/autocert: Manager.Prompt not set")
-	}
-
-	name := hello.ServerName
-	if name == "" {
-		return nil, errors.New("acme/autocert: missing server name")
-	}
-	if !strings.Contains(strings.Trim(name, "."), ".") {
-		return nil, errors.New("acme/autocert: server name component count invalid")
-	}
-	if strings.ContainsAny(name, `/\`) {
-		return nil, errors.New("acme/autocert: server name contains invalid character")
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
-	defer cancel()
-
-	// check whether this is a token cert requested for TLS-SNI challenge
-	if strings.HasSuffix(name, ".acme.invalid") {
-		m.tokenCertMu.RLock()
-		defer m.tokenCertMu.RUnlock()
-		if cert := m.tokenCert[name]; cert != nil {
-			return cert, nil
-		}
-		if cert, err := m.cacheGet(ctx, name); err == nil {
-			return cert, nil
-		}
-		// TODO: cache error results?
-		return nil, fmt.Errorf("acme/autocert: no token cert for %q", name)
-	}
-
-	// regular domain
-	name = strings.TrimSuffix(name, ".") // golang.org/issue/18114
-	cert, err := m.cert(ctx, name)
-	if err == nil {
-		return cert, nil
-	}
-	if err != ErrCacheMiss {
-		return nil, err
-	}
-
-	// first-time
-	if err := m.hostPolicy()(ctx, name); err != nil {
-		return nil, err
-	}
-	cert, err = m.createCert(ctx, name)
-	if err != nil {
-		return nil, err
-	}
-	m.cachePut(ctx, name, cert)
-	return cert, nil
-}
-
-// cert returns an existing certificate either from m.state or cache.
-// If a certificate is found in cache but not in m.state, the latter will be filled
-// with the cached value.
-func (m *Manager) cert(ctx context.Context, name string) (*tls.Certificate, error) {
-	m.stateMu.Lock()
-	if s, ok := m.state[name]; ok {
-		m.stateMu.Unlock()
-		s.RLock()
-		defer s.RUnlock()
-		return s.tlscert()
-	}
-	defer m.stateMu.Unlock()
-	cert, err := m.cacheGet(ctx, name)
-	if err != nil {
-		return nil, err
-	}
-	signer, ok := cert.PrivateKey.(crypto.Signer)
-	if !ok {
-		return nil, errors.New("acme/autocert: private key cannot sign")
-	}
-	if m.state == nil {
-		m.state = make(map[string]*certState)
-	}
-	s := &certState{
-		key:  signer,
-		cert: cert.Certificate,
-		leaf: cert.Leaf,
-	}
-	m.state[name] = s
-	go m.renew(name, s.key, s.leaf.NotAfter)
-	return cert, nil
-}
-
-// cacheGet always returns a valid certificate, or an error otherwise.
-// If a cached certficate exists but is not valid, ErrCacheMiss is returned.
-func (m *Manager) cacheGet(ctx context.Context, domain string) (*tls.Certificate, error) {
-	if m.Cache == nil {
-		return nil, ErrCacheMiss
-	}
-	data, err := m.Cache.Get(ctx, domain)
-	if err != nil {
-		return nil, err
-	}
-
-	// private
-	priv, pub := pem.Decode(data)
-	if priv == nil || !strings.Contains(priv.Type, "PRIVATE") {
-		return nil, ErrCacheMiss
-	}
-	privKey, err := parsePrivateKey(priv.Bytes)
-	if err != nil {
-		return nil, err
-	}
-
-	// public
-	var pubDER [][]byte
-	for len(pub) > 0 {
-		var b *pem.Block
-		b, pub = pem.Decode(pub)
-		if b == nil {
-			break
-		}
-		pubDER = append(pubDER, b.Bytes)
-	}
-	if len(pub) > 0 {
-		// Leftover content not consumed by pem.Decode. Corrupt. Ignore.
-		return nil, ErrCacheMiss
-	}
-
-	// verify and create TLS cert
-	leaf, err := validCert(domain, pubDER, privKey)
-	if err != nil {
-		return nil, ErrCacheMiss
-	}
-	tlscert := &tls.Certificate{
-		Certificate: pubDER,
-		PrivateKey:  privKey,
-		Leaf:        leaf,
-	}
-	return tlscert, nil
-}
-
-func (m *Manager) cachePut(ctx context.Context, domain string, tlscert *tls.Certificate) error {
-	if m.Cache == nil {
-		return nil
-	}
-
-	// contains PEM-encoded data
-	var buf bytes.Buffer
-
-	// private
-	switch key := tlscert.PrivateKey.(type) {
-	case *ecdsa.PrivateKey:
-		if err := encodeECDSAKey(&buf, key); err != nil {
-			return err
-		}
-	case *rsa.PrivateKey:
-		b := x509.MarshalPKCS1PrivateKey(key)
-		pb := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: b}
-		if err := pem.Encode(&buf, pb); err != nil {
-			return err
-		}
-	default:
-		return errors.New("acme/autocert: unknown private key type")
-	}
-
-	// public
-	for _, b := range tlscert.Certificate {
-		pb := &pem.Block{Type: "CERTIFICATE", Bytes: b}
-		if err := pem.Encode(&buf, pb); err != nil {
-			return err
-		}
-	}
-
-	return m.Cache.Put(ctx, domain, buf.Bytes())
-}
-
-func encodeECDSAKey(w io.Writer, key *ecdsa.PrivateKey) error {
-	b, err := x509.MarshalECPrivateKey(key)
-	if err != nil {
-		return err
-	}
-	pb := &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
-	return pem.Encode(w, pb)
-}
-
-// createCert starts the domain ownership verification and returns a certificate
-// for that domain upon success.
-//
-// If the domain is already being verified, it waits for the existing verification to complete.
-// Either way, createCert blocks for the duration of the whole process.
-func (m *Manager) createCert(ctx context.Context, domain string) (*tls.Certificate, error) {
-	// TODO: maybe rewrite this whole piece using sync.Once
-	state, err := m.certState(domain)
-	if err != nil {
-		return nil, err
-	}
-	// state may exist if another goroutine is already working on it
-	// in which case just wait for it to finish
-	if !state.locked {
-		state.RLock()
-		defer state.RUnlock()
-		return state.tlscert()
-	}
-
-	// We are the first; state is locked.
-	// Unblock the readers when domain ownership is verified
-	// and the we got the cert or the process failed.
-	defer state.Unlock()
-	state.locked = false
-
-	der, leaf, err := m.authorizedCert(ctx, state.key, domain)
-	if err != nil {
-		// Remove the failed state after some time,
-		// making the manager call createCert again on the following TLS hello.
-		time.AfterFunc(createCertRetryAfter, func() {
-			defer testDidRemoveState(domain)
-			m.stateMu.Lock()
-			defer m.stateMu.Unlock()
-			// Verify the state hasn't changed and it's still invalid
-			// before deleting.
-			s, ok := m.state[domain]
-			if !ok {
-				return
-			}
-			if _, err := validCert(domain, s.cert, s.key); err == nil {
-				return
-			}
-			delete(m.state, domain)
-		})
-		return nil, err
-	}
-	state.cert = der
-	state.leaf = leaf
-	go m.renew(domain, state.key, state.leaf.NotAfter)
-	return state.tlscert()
-}
-
-// certState returns a new or existing certState.
-// If a new certState is returned, state.exist is false and the state is locked.
-// The returned error is non-nil only in the case where a new state could not be created.
-func (m *Manager) certState(domain string) (*certState, error) {
-	m.stateMu.Lock()
-	defer m.stateMu.Unlock()
-	if m.state == nil {
-		m.state = make(map[string]*certState)
-	}
-	// existing state
-	if state, ok := m.state[domain]; ok {
-		return state, nil
-	}
-
-	// new locked state
-	var (
-		err error
-		key crypto.Signer
-	)
-	if m.ForceRSA {
-		key, err = rsa.GenerateKey(rand.Reader, 2048)
-	} else {
-		key, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	}
-	if err != nil {
-		return nil, err
-	}
-
-	state := &certState{
-		key:    key,
-		locked: true,
-	}
-	state.Lock() // will be unlocked by m.certState caller
-	m.state[domain] = state
-	return state, nil
-}
-
-// authorizedCert starts domain ownership verification process and requests a new cert upon success.
-// The key argument is the certificate private key.
-func (m *Manager) authorizedCert(ctx context.Context, key crypto.Signer, domain string) (der [][]byte, leaf *x509.Certificate, err error) {
-	if err := m.verify(ctx, domain); err != nil {
-		return nil, nil, err
-	}
-	client, err := m.acmeClient(ctx)
-	if err != nil {
-		return nil, nil, err
-	}
-	csr, err := certRequest(key, domain)
-	if err != nil {
-		return nil, nil, err
-	}
-	der, _, err = client.CreateCert(ctx, csr, 0, true)
-	if err != nil {
-		return nil, nil, err
-	}
-	leaf, err = validCert(domain, der, key)
-	if err != nil {
-		return nil, nil, err
-	}
-	return der, leaf, nil
-}
-
-// verify starts a new identifier (domain) authorization flow.
-// It prepares a challenge response and then blocks until the authorization
-// is marked as "completed" by the CA (either succeeded or failed).
-//
-// verify returns nil iff the verification was successful.
-func (m *Manager) verify(ctx context.Context, domain string) error {
-	client, err := m.acmeClient(ctx)
-	if err != nil {
-		return err
-	}
-
-	// start domain authorization and get the challenge
-	authz, err := client.Authorize(ctx, domain)
-	if err != nil {
-		return err
-	}
-	// maybe don't need to at all
-	if authz.Status == acme.StatusValid {
-		return nil
-	}
-
-	// pick a challenge: prefer tls-sni-02 over tls-sni-01
-	// TODO: consider authz.Combinations
-	var chal *acme.Challenge
-	for _, c := range authz.Challenges {
-		if c.Type == "tls-sni-02" {
-			chal = c
-			break
-		}
-		if c.Type == "tls-sni-01" {
-			chal = c
-		}
-	}
-	if chal == nil {
-		return errors.New("acme/autocert: no supported challenge type found")
-	}
-
-	// create a token cert for the challenge response
-	var (
-		cert tls.Certificate
-		name string
-	)
-	switch chal.Type {
-	case "tls-sni-01":
-		cert, name, err = client.TLSSNI01ChallengeCert(chal.Token)
-	case "tls-sni-02":
-		cert, name, err = client.TLSSNI02ChallengeCert(chal.Token)
-	default:
-		err = fmt.Errorf("acme/autocert: unknown challenge type %q", chal.Type)
-	}
-	if err != nil {
-		return err
-	}
-	m.putTokenCert(ctx, name, &cert)
-	defer func() {
-		// verification has ended at this point
-		// don't need token cert anymore
-		go m.deleteTokenCert(name)
-	}()
-
-	// ready to fulfill the challenge
-	if _, err := client.Accept(ctx, chal); err != nil {
-		return err
-	}
-	// wait for the CA to validate
-	_, err = client.WaitAuthorization(ctx, authz.URI)
-	return err
-}
-
-// putTokenCert stores the cert under the named key in both m.tokenCert map
-// and m.Cache.
-func (m *Manager) putTokenCert(ctx context.Context, name string, cert *tls.Certificate) {
-	m.tokenCertMu.Lock()
-	defer m.tokenCertMu.Unlock()
-	if m.tokenCert == nil {
-		m.tokenCert = make(map[string]*tls.Certificate)
-	}
-	m.tokenCert[name] = cert
-	m.cachePut(ctx, name, cert)
-}
-
-// deleteTokenCert removes the token certificate for the specified domain name
-// from both m.tokenCert map and m.Cache.
-func (m *Manager) deleteTokenCert(name string) {
-	m.tokenCertMu.Lock()
-	defer m.tokenCertMu.Unlock()
-	delete(m.tokenCert, name)
-	if m.Cache != nil {
-		m.Cache.Delete(context.Background(), name)
-	}
-}
-
-// renew starts a cert renewal timer loop, one per domain.
-//
-// The loop is scheduled in two cases:
-// - a cert was fetched from cache for the first time (wasn't in m.state)
-// - a new cert was created by m.createCert
-//
-// The key argument is a certificate private key.
-// The exp argument is the cert expiration time (NotAfter).
-func (m *Manager) renew(domain string, key crypto.Signer, exp time.Time) {
-	m.renewalMu.Lock()
-	defer m.renewalMu.Unlock()
-	if m.renewal[domain] != nil {
-		// another goroutine is already on it
-		return
-	}
-	if m.renewal == nil {
-		m.renewal = make(map[string]*domainRenewal)
-	}
-	dr := &domainRenewal{m: m, domain: domain, key: key}
-	m.renewal[domain] = dr
-	dr.start(exp)
-}
-
-// stopRenew stops all currently running cert renewal timers.
-// The timers are not restarted during the lifetime of the Manager.
-func (m *Manager) stopRenew() {
-	m.renewalMu.Lock()
-	defer m.renewalMu.Unlock()
-	for name, dr := range m.renewal {
-		delete(m.renewal, name)
-		dr.stop()
-	}
-}
-
-func (m *Manager) accountKey(ctx context.Context) (crypto.Signer, error) {
-	const keyName = "acme_account.key"
-
-	genKey := func() (*ecdsa.PrivateKey, error) {
-		return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-	}
-
-	if m.Cache == nil {
-		return genKey()
-	}
-
-	data, err := m.Cache.Get(ctx, keyName)
-	if err == ErrCacheMiss {
-		key, err := genKey()
-		if err != nil {
-			return nil, err
-		}
-		var buf bytes.Buffer
-		if err := encodeECDSAKey(&buf, key); err != nil {
-			return nil, err
-		}
-		if err := m.Cache.Put(ctx, keyName, buf.Bytes()); err != nil {
-			return nil, err
-		}
-		return key, nil
-	}
-	if err != nil {
-		return nil, err
-	}
-
-	priv, _ := pem.Decode(data)
-	if priv == nil || !strings.Contains(priv.Type, "PRIVATE") {
-		return nil, errors.New("acme/autocert: invalid account key found in cache")
-	}
-	return parsePrivateKey(priv.Bytes)
-}
-
-func (m *Manager) acmeClient(ctx context.Context) (*acme.Client, error) {
-	m.clientMu.Lock()
-	defer m.clientMu.Unlock()
-	if m.client != nil {
-		return m.client, nil
-	}
-
-	client := m.Client
-	if client == nil {
-		client = &acme.Client{DirectoryURL: acme.LetsEncryptURL}
-	}
-	if client.Key == nil {
-		var err error
-		client.Key, err = m.accountKey(ctx)
-		if err != nil {
-			return nil, err
-		}
-	}
-	var contact []string
-	if m.Email != "" {
-		contact = []string{"mailto:" + m.Email}
-	}
-	a := &acme.Account{Contact: contact}
-	_, err := client.Register(ctx, a, m.Prompt)
-	if ae, ok := err.(*acme.Error); err == nil || ok && ae.StatusCode == http.StatusConflict {
-		// conflict indicates the key is already registered
-		m.client = client
-		err = nil
-	}
-	return m.client, err
-}
-
-func (m *Manager) hostPolicy() HostPolicy {
-	if m.HostPolicy != nil {
-		return m.HostPolicy
-	}
-	return defaultHostPolicy
-}
-
-func (m *Manager) renewBefore() time.Duration {
-	if m.RenewBefore > renewJitter {
-		return m.RenewBefore
-	}
-	return 720 * time.Hour // 30 days
-}
-
-// certState is ready when its mutex is unlocked for reading.
-type certState struct {
-	sync.RWMutex
-	locked bool              // locked for read/write
-	key    crypto.Signer     // private key for cert
-	cert   [][]byte          // DER encoding
-	leaf   *x509.Certificate // parsed cert[0]; always non-nil if cert != nil
-}
-
-// tlscert creates a tls.Certificate from s.key and s.cert.
-// Callers should wrap it in s.RLock() and s.RUnlock().
-func (s *certState) tlscert() (*tls.Certificate, error) {
-	if s.key == nil {
-		return nil, errors.New("acme/autocert: missing signer")
-	}
-	if len(s.cert) == 0 {
-		return nil, errors.New("acme/autocert: missing certificate")
-	}
-	return &tls.Certificate{
-		PrivateKey:  s.key,
-		Certificate: s.cert,
-		Leaf:        s.leaf,
-	}, nil
-}
-
-// certRequest creates a certificate request for the given common name cn
-// and optional SANs.
-func certRequest(key crypto.Signer, cn string, san ...string) ([]byte, error) {
-	req := &x509.CertificateRequest{
-		Subject:  pkix.Name{CommonName: cn},
-		DNSNames: san,
-	}
-	return x509.CreateCertificateRequest(rand.Reader, req, key)
-}
-
-// Attempt to parse the given private key DER block. OpenSSL 0.9.8 generates
-// PKCS#1 private keys by default, while OpenSSL 1.0.0 generates PKCS#8 keys.
-// OpenSSL ecparam generates SEC1 EC private keys for ECDSA. We try all three.
-//
-// Inspired by parsePrivateKey in crypto/tls/tls.go.
-func parsePrivateKey(der []byte) (crypto.Signer, error) {
-	if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
-		return key, nil
-	}
-	if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
-		switch key := key.(type) {
-		case *rsa.PrivateKey:
-			return key, nil
-		case *ecdsa.PrivateKey:
-			return key, nil
-		default:
-			return nil, errors.New("acme/autocert: unknown private key type in PKCS#8 wrapping")
-		}
-	}
-	if key, err := x509.ParseECPrivateKey(der); err == nil {
-		return key, nil
-	}
-
-	return nil, errors.New("acme/autocert: failed to parse private key")
-}
-
-// validCert parses a cert chain provided as der argument and verifies the leaf, der[0],
-// corresponds to the private key, as well as the domain match and expiration dates.
-// It doesn't do any revocation checking.
-//
-// The returned value is the verified leaf cert.
-func validCert(domain string, der [][]byte, key crypto.Signer) (leaf *x509.Certificate, err error) {
-	// parse public part(s)
-	var n int
-	for _, b := range der {
-		n += len(b)
-	}
-	pub := make([]byte, n)
-	n = 0
-	for _, b := range der {
-		n += copy(pub[n:], b)
-	}
-	x509Cert, err := x509.ParseCertificates(pub)
-	if len(x509Cert) == 0 {
-		return nil, errors.New("acme/autocert: no public key found")
-	}
-	// verify the leaf is not expired and matches the domain name
-	leaf = x509Cert[0]
-	now := timeNow()
-	if now.Before(leaf.NotBefore) {
-		return nil, errors.New("acme/autocert: certificate is not valid yet")
-	}
-	if now.After(leaf.NotAfter) {
-		return nil, errors.New("acme/autocert: expired certificate")
-	}
-	if err := leaf.VerifyHostname(domain); err != nil {
-		return nil, err
-	}
-	// ensure the leaf corresponds to the private key
-	switch pub := leaf.PublicKey.(type) {
-	case *rsa.PublicKey:
-		prv, ok := key.(*rsa.PrivateKey)
-		if !ok {
-			return nil, errors.New("acme/autocert: private key type does not match public key type")
-		}
-		if pub.N.Cmp(prv.N) != 0 {
-			return nil, errors.New("acme/autocert: private key does not match public key")
-		}
-	case *ecdsa.PublicKey:
-		prv, ok := key.(*ecdsa.PrivateKey)
-		if !ok {
-			return nil, errors.New("acme/autocert: private key type does not match public key type")
-		}
-		if pub.X.Cmp(prv.X) != 0 || pub.Y.Cmp(prv.Y) != 0 {
-			return nil, errors.New("acme/autocert: private key does not match public key")
-		}
-	default:
-		return nil, errors.New("acme/autocert: unknown public key algorithm")
-	}
-	return leaf, nil
-}
-
-func retryAfter(v string) time.Duration {
-	if i, err := strconv.Atoi(v); err == nil {
-		return time.Duration(i) * time.Second
-	}
-	if t, err := http.ParseTime(v); err == nil {
-		return t.Sub(timeNow())
-	}
-	return time.Second
-}
-
-type lockedMathRand struct {
-	sync.Mutex
-	rnd *mathrand.Rand
-}
-
-func (r *lockedMathRand) int63n(max int64) int64 {
-	r.Lock()
-	n := r.rnd.Int63n(max)
-	r.Unlock()
-	return n
-}
-
-// For easier testing.
-var (
-	timeNow = time.Now
-
-	// Called when a state is removed.
-	testDidRemoveState = func(domain string) {}
-)

vendor/golang.org/x/crypto/acme/autocert/cache.go

-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package autocert
-
-import (
-	"context"
-	"errors"
-	"io/ioutil"
-	"os"
-	"path/filepath"
-)
-
-// ErrCacheMiss is returned when a certificate is not found in cache.
-var ErrCacheMiss = errors.New("acme/autocert: certificate cache miss")
-
-// Cache is used by Manager to store and retrieve previously obtained certificates
-// as opaque data.
-//
-// The key argument of the methods refers to a domain name but need not be an FQDN.
-// Cache implementations should not rely on the key naming pattern.
-type Cache interface {
-	// Get returns a certificate data for the specified key.
-	// If there's no such key, Get returns ErrCacheMiss.
-	Get(ctx context.Context, key string) ([]byte, error)
-
-	// Put stores the data in the cache under the specified key.
-	// Underlying implementations may use any data storage format,
-	// as long as the reverse operation, Get, results in the original data.
-	Put(ctx context.Context, key string, data []byte) error
-
-	// Delete removes a certificate data from the cache under the specified key.
-	// If there's no such key in the cache, Delete returns nil.
-	Delete(ctx context.Context, key string) error
-}
-
-// DirCache implements Cache using a directory on the local filesystem.
-// If the directory does not exist, it will be created with 0700 permissions.
-type DirCache string
-
-// Get reads a certificate data from the specified file name.
-func (d DirCache) Get(ctx context.Context, name string) ([]byte, error) {
-	name = filepath.Join(string(d), name)
-	var (
-		data []byte
-		err  error
-		done = make(chan struct{})
-	)
-	go func() {
-		data, err = ioutil.ReadFile(name)
-		close(done)
-	}()
-	select {
-	case <-ctx.Done():
-		return nil, ctx.Err()
-	case <-done:
-	}
-	if os.IsNotExist(err) {
-		return nil, ErrCacheMiss
-	}
-	return data, err
-}
-
-// Put writes the certificate data to the specified file name.
-// The file will be created with 0600 permissions.
-func (d DirCache) Put(ctx context.Context, name string, data []byte) error {
-	if err := os.MkdirAll(string(d), 0700); err != nil {
-		return err
-	}
-
-	done := make(chan struct{})
-	var err error
-	go func() {
-		defer close(done)
-		var tmp string
-		if tmp, err = d.writeTempFile(name, data); err != nil {
-			return
-		}
-		select {
-		case <-ctx.Done():
-			// Don't overwrite the file if the context was canceled.
-		default:
-			newName := filepath.Join(string(d), name)
-			err = os.Rename(tmp, newName)
-		}
-	}()
-	select {
-	case <-ctx.Done():
-		return ctx.Err()
-	case <-done:
-	}
-	return err
-}
-
-// Delete removes the specified file name.
-func (d DirCache) Delete(ctx context.Context, name string) error {
-	name = filepath.Join(string(d), name)
-	var (
-		err  error
-		done = make(chan struct{})
-	)
-	go func() {
-		err = os.Remove(name)
-		close(done)
-	}()
-	select {
-	case <-ctx.Done():
-		return ctx.Err()
-	case <-done:
-	}
-	if err != nil && !os.IsNotExist(err) {
-		return err
-	}
-	return nil
-}
-
-// writeTempFile writes b to a temporary file, closes the file and returns its path.
-func (d DirCache) writeTempFile(prefix string, b []byte) (string, error) {
-	// TempFile uses 0600 permissions
-	f, err := ioutil.TempFile(string(d), prefix)
-	if err != nil {
-		return "", err
-	}
-	if _, err := f.Write(b); err != nil {
-		f.Close()
-		return "", err
-	}
-	return f.Name(), f.Close()
-}

vendor/golang.org/x/crypto/acme/autocert/listener.go

-// Copyright 2017 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package autocert
-
-import (
-	"crypto/tls"
-	"log"
-	"net"
-	"os"
-	"path/filepath"
-	"runtime"
-	"time"
-)
-
-// NewListener returns a net.Listener that listens on the standard TLS
-// port (443) on all interfaces and returns *tls.Conn connections with
-// LetsEncrypt certificates for the provided domain or domains.
-//
-// It enables one-line HTTPS servers:
-//
-//     log.Fatal(http.Serve(autocert.NewListener("example.com"), handler))
-//
-// NewListener is a convenience function for a common configuration.
-// More complex or custom configurations can use the autocert.Manager
-// type instead.
-//
-// Use of this function implies acceptance of the LetsEncrypt Terms of
-// Service. If domains is not empty, the provided domains are passed
-// to HostWhitelist. If domains is empty, the listener will do
-// LetsEncrypt challenges for any requested domain, which is not
-// recommended.
-//
-// Certificates are cached in a "golang-autocert" directory under an
-// operating system-specific cache or temp directory. This may not
-// be suitable for servers spanning multiple machines.
-//
-// The returned listener uses a *tls.Config that enables HTTP/2, and
-// should only be used with servers that support HTTP/2.
-//
-// The returned Listener also enables TCP keep-alives on the accepted
-// connections. The returned *tls.Conn are returned before their TLS
-// handshake has completed.
-func NewListener(domains ...string) net.Listener {
-	m := &Manager{
-		Prompt: AcceptTOS,
-	}
-	if len(domains) > 0 {
-		m.HostPolicy = HostWhitelist(domains...)
-	}
-	dir := cacheDir()
-	if err := os.MkdirAll(dir, 0700); err != nil {
-		log.Printf("warning: autocert.NewListener not using a cache: %v", err)
-	} else {
-		m.Cache = DirCache(dir)
-	}
-	return m.Listener()
-}
-
-// Listener listens on the standard TLS port (443) on all interfaces
-// and returns a net.Listener returning *tls.Conn connections.
-//
-// The returned listener uses a *tls.Config that enables HTTP/2, and
-// should only be used with servers that support HTTP/2.
-//
-// The returned Listener also enables TCP keep-alives on the accepted
-// connections. The returned *tls.Conn are returned before their TLS
-// handshake has completed.
-//
-// Unlike NewListener, it is the caller's responsibility to initialize
-// the Manager m's Prompt, Cache, HostPolicy, and other desired options.
-func (m *Manager) Listener() net.Listener {
-	ln := &listener{
-		m: m,
-		conf: &tls.Config{
-			GetCertificate: m.GetCertificate,           // bonus: panic on nil m
-			NextProtos:     []string{"h2", "http/1.1"}, // Enable HTTP/2
-		},
-	}
-	ln.tcpListener, ln.tcpListenErr = net.Listen("tcp", ":443")
-	return ln
-}
-
-type listener struct {
-	m    *Manager
-	conf *tls.Config
-
-	tcpListener  net.Listener
-	tcpListenErr error
-}
-
-func (ln *listener) Accept() (net.Conn, error) {
-	if ln.tcpListenErr != nil {
-		return nil, ln.tcpListenErr
-	}
-	conn, err := ln.tcpListener.Accept()
-	if err != nil {
-		return nil, err
-	}
-	tcpConn := conn.(*net.TCPConn)
-
-	// Because Listener is a convenience function, help out with
-	// this too.  This is not possible for the caller to set once
-	// we return a *tcp.Conn wrapping an inaccessible net.Conn.
-	// If callers don't want this, they can do things the manual
-	// way and tweak as needed. But this is what net/http does
-	// itself, so copy that. If net/http changes, we can change
-	// here too.
-	tcpConn.SetKeepAlive(true)
-	tcpConn.SetKeepAlivePeriod(3 * time.Minute)
-
-	return tls.Server(tcpConn, ln.conf), nil
-}
-
-func (ln *listener) Addr() net.Addr {
-	if ln.tcpListener != nil {
-		return ln.tcpListener.Addr()
-	}
-	// net.Listen failed. Return something non-nil in case callers
-	// call Addr before Accept:
-	return &net.TCPAddr{IP: net.IP{0, 0, 0, 0}, Port: 443}
-}
-
-func (ln *listener) Close() error {
-	if ln.tcpListenErr != nil {
-		return ln.tcpListenErr
-	}
-	return ln.tcpListener.Close()
-}
-
-func homeDir() string {
-	if runtime.GOOS == "windows" {
-		return os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
-	}
-	if h := os.Getenv("HOME"); h != "" {
-		return h
-	}
-	return "/"
-}
-
-func cacheDir() string {
-	const base = "golang-autocert"
-	switch runtime.GOOS {
-	case "darwin":
-		return filepath.Join(homeDir(), "Library", "Caches", base)
-	case "windows":
-		for _, ev := range []string{"APPDATA", "CSIDL_APPDATA", "TEMP", "TMP"} {
-			if v := os.Getenv(ev); v != "" {
-				return filepath.Join(v, base)
-			}
-		}
-		// Worst case:
-		return filepath.Join(homeDir(), base)
-	}
-	if xdg := os.Getenv("XDG_CACHE_HOME"); xdg != "" {
-		return filepath.Join(xdg, base)
-	}
-	return filepath.Join(homeDir(), ".cache", base)
-}

vendor/golang.org/x/crypto/acme/autocert/renewal.go

-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package autocert
-
-import (
-	"context"
-	"crypto"
-	"sync"
-	"time"
-)
-
-// renewJitter is the maximum deviation from Manager.RenewBefore.
-const renewJitter = time.Hour
-
-// domainRenewal tracks the state used by the periodic timers
-// renewing a single domain's cert.
-type domainRenewal struct {
-	m      *Manager
-	domain string
-	key    crypto.Signer
-
-	timerMu sync.Mutex
-	timer   *time.Timer
-}
-
-// start starts a cert renewal timer at the time
-// defined by the certificate expiration time exp.
-//
-// If the timer is already started, calling start is a noop.
-func (dr *domainRenewal) start(exp time.Time) {
-	dr.timerMu.Lock()
-	defer dr.timerMu.Unlock()
-	if dr.timer != nil {
-		return
-	}
-	dr.timer = time.AfterFunc(dr.next(exp), dr.renew)
-}
-
-// stop stops the cert renewal timer.
-// If the timer is already stopped, calling stop is a noop.
-func (dr *domainRenewal) stop() {
-	dr.timerMu.Lock()
-	defer dr.timerMu.Unlock()
-	if dr.timer == nil {
-		return
-	}
-	dr.timer.Stop()
-	dr.timer = nil
-}
-
-// renew is called periodically by a timer.
-// The first renew call is kicked off by dr.start.
-func (dr *domainRenewal) renew() {
-	dr.timerMu.Lock()
-	defer dr.timerMu.Unlock()
-	if dr.timer == nil {
-		return
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
-	defer cancel()
-	// TODO: rotate dr.key at some point?
-	next, err := dr.do(ctx)
-	if err != nil {
-		next = renewJitter / 2
-		next += time.Duration(pseudoRand.int63n(int64(next)))
-	}
-	dr.timer = time.AfterFunc(next, dr.renew)
-	testDidRenewLoop(next, err)
-}
-
-// do is similar to Manager.createCert but it doesn't lock a Manager.state item.
-// Instead, it requests a new certificate independently and, upon success,
-// replaces dr.m.state item with a new one and updates cache for the given domain.
-//
-// It may return immediately if the expiration date of the currently cached cert
-// is far enough in the future.
-//
-// The returned value is a time interval after which the renewal should occur again.
-func (dr *domainRenewal) do(ctx context.Context) (time.Duration, error) {
-	// a race is likely unavoidable in a distributed environment
-	// but we try nonetheless
-	if tlscert, err := dr.m.cacheGet(ctx, dr.domain); err == nil {
-		next := dr.next(tlscert.Leaf.NotAfter)
-		if next > dr.m.renewBefore()+renewJitter {
-			return next, nil
-		}
-	}
-
-	der, leaf, err := dr.m.authorizedCert(ctx, dr.key, dr.domain)
-	if err != nil {
-		return 0, err
-	}
-	state := &certState{
-		key:  dr.key,
-		cert: der,
-		leaf: leaf,
-	}
-	tlscert, err := state.tlscert()
-	if err != nil {
-		return 0, err
-	}
-	dr.m.cachePut(ctx, dr.domain, tlscert)
-	dr.m.stateMu.Lock()
-	defer dr.m.stateMu.Unlock()
-	// m.state is guaranteed to be non-nil at this point
-	dr.m.state[dr.domain] = state
-	return dr.next(leaf.NotAfter), nil
-}
-
-func (dr *domainRenewal) next(expiry time.Time) time.Duration {
-	d := expiry.Sub(timeNow()) - dr.m.renewBefore()
-	// add a bit of randomness to renew deadline
-	n := pseudoRand.int63n(int64(renewJitter))
-	d -= time.Duration(n)
-	if d < 0 {
-		return 0
-	}
-	return d
-}
-
-var testDidRenewLoop = func(next time.Duration, err error) {}

vendor/golang.org/x/crypto/acme/jws.go

-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package acme
-
-import (
-	"crypto"
-	"crypto/ecdsa"
-	"crypto/rand"
-	"crypto/rsa"
-	"crypto/sha256"
-	_ "crypto/sha512" // need for EC keys
-	"encoding/base64"
-	"encoding/json"
-	"fmt"
-	"math/big"
-)
-
-// jwsEncodeJSON signs claimset using provided key and a nonce.
-// The result is serialized in JSON format.
-// See https://tools.ietf.org/html/rfc7515#section-7.
-func jwsEncodeJSON(claimset interface{}, key crypto.Signer, nonce string) ([]byte, error) {
-	jwk, err := jwkEncode(key.Public())
-	if err != nil {
-		return nil, err
-	}
-	alg, sha := jwsHasher(key)
-	if alg == "" || !sha.Available() {
-		return nil, ErrUnsupportedKey
-	}
-	phead := fmt.Sprintf(`{"alg":%q,"jwk":%s,"nonce":%q}`, alg, jwk, nonce)
-	phead = base64.RawURLEncoding.EncodeToString([]byte(phead))
-	cs, err := json.Marshal(claimset)
-	if err != nil {
-		return nil, err
-	}
-	payload := base64.RawURLEncoding.EncodeToString(cs)
-	hash := sha.New()
-	hash.Write([]byte(phead + "." + payload))
-	sig, err := jwsSign(key, sha, hash.Sum(nil))
-	if err != nil {
-		return nil, err
-	}
-
-	enc := struct {
-		Protected string `json:"protected"`
-		Payload   string `json:"payload"`
-		Sig       string `json:"signature"`
-	}{
-		Protected: phead,
-		Payload:   payload,
-		Sig:       base64.RawURLEncoding.EncodeToString(sig),
-	}
-	return json.Marshal(&enc)
-}
-
-// jwkEncode encodes public part of an RSA or ECDSA key into a JWK.
-// The result is also suitable for creating a JWK thumbprint.
-// https://tools.ietf.org/html/rfc7517
-func jwkEncode(pub crypto.PublicKey) (string, error) {
-	switch pub := pub.(type) {
-	case *rsa.PublicKey:
-		// https://tools.ietf.org/html/rfc7518#section-6.3.1
-		n := pub.N
-		e := big.NewInt(int64(pub.E))
-		// Field order is important.
-		// See https://tools.ietf.org/html/rfc7638#section-3.3 for details.
-		return fmt.Sprintf(`{"e":"%s","kty":"RSA","n":"%s"}`,
-			base64.RawURLEncoding.EncodeToString(e.Bytes()),
-			base64.RawURLEncoding.EncodeToString(n.Bytes()),
-		), nil
-	case *ecdsa.PublicKey:
-		// https://tools.ietf.org/html/rfc7518#section-6.2.1
-		p := pub.Curve.Params()
-		n := p.BitSize / 8
-		if p.BitSize%8 != 0 {
-			n++
-		}
-		x := pub.X.Bytes()
-		if n > len(x) {
-			x = append(make([]byte, n-len(x)), x...)
-		}
-		y := pub.Y.Bytes()
-		if n > len(y) {
-			y = append(make([]byte, n-len(y)), y...)
-		}
-		// Field order is important.
-		// See https://tools.ietf.org/html/rfc7638#section-3.3 for details.
-		return fmt.Sprintf(`{"crv":"%s","kty":"EC","x":"%s","y":"%s"}`,
-			p.Name,
-			base64.RawURLEncoding.EncodeToString(x),
-			base64.RawURLEncoding.EncodeToString(y),
-		), nil
-	}
-	return "", ErrUnsupportedKey
-}
-
-// jwsSign signs the digest using the given key.
-// It returns ErrUnsupportedKey if the key type is unknown.
-// The hash is used only for RSA keys.
-func jwsSign(key crypto.Signer, hash crypto.Hash, digest []byte) ([]byte, error) {
-	switch key := key.(type) {
-	case *rsa.PrivateKey:
-		return key.Sign(rand.Reader, digest, hash)
-	case *ecdsa.PrivateKey:
-		r, s, err := ecdsa.Sign(rand.Reader, key, digest)
-		if err != nil {
-			return nil, err
-		}
-		rb, sb := r.Bytes(), s.Bytes()
-		size := key.Params().BitSize / 8
-		if size%8 > 0 {
-			size++
-		}
-		sig := make([]byte, size*2)
-		copy(sig[size-len(rb):], rb)
-		copy(sig[size*2-len(sb):], sb)
-		return sig, nil
-	}
-	return nil, ErrUnsupportedKey
-}
-
-// jwsHasher indicates suitable JWS algorithm name and a hash function
-// to use for signing a digest with the provided key.
-// It returns ("", 0) if the key is not supported.
-func jwsHasher(key crypto.Signer) (string, crypto.Hash) {
-	switch key := key.(type) {
-	case *rsa.PrivateKey:
-		return "RS256", crypto.SHA256
-	case *ecdsa.PrivateKey:
-		switch key.Params().Name {
-		case "P-256":
-			return "ES256", crypto.SHA256
-		case "P-384":
-			return "ES384", crypto.SHA384
-		case "P-521":
-			return "ES512", crypto.SHA512
-		}
-	}
-	return "", 0
-}
-
-// JWKThumbprint creates a JWK thumbprint out of pub
-// as specified in https://tools.ietf.org/html/rfc7638.
-func JWKThumbprint(pub crypto.PublicKey) (string, error) {
-	jwk, err := jwkEncode(pub)
-	if err != nil {
-		return "", err
-	}
-	b := sha256.Sum256([]byte(jwk))
-	return base64.RawURLEncoding.EncodeToString(b[:]), nil
-}

vendor/golang.org/x/crypto/acme/types.go

-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package acme
-
-import (
-	"errors"
-	"fmt"
-	"net/http"
-	"strings"
-	"time"
-)
-
-// ACME server response statuses used to describe Authorization and Challenge states.
-const (
-	StatusUnknown    = "unknown"
-	StatusPending    = "pending"
-	StatusProcessing = "processing"
-	StatusValid      = "valid"
-	StatusInvalid    = "invalid"
-	StatusRevoked    = "revoked"
-)
-
-// CRLReasonCode identifies the reason for a certificate revocation.
-type CRLReasonCode int
-
-// CRL reason codes as defined in RFC 5280.
-const (
-	CRLReasonUnspecified          CRLReasonCode = 0
-	CRLReasonKeyCompromise        CRLReasonCode = 1
-	CRLReasonCACompromise         CRLReasonCode = 2
-	CRLReasonAffiliationChanged   CRLReasonCode = 3
-	CRLReasonSuperseded           CRLReasonCode = 4
-	CRLReasonCessationOfOperation CRLReasonCode = 5
-	CRLReasonCertificateHold      CRLReasonCode = 6
-	CRLReasonRemoveFromCRL        CRLReasonCode = 8
-	CRLReasonPrivilegeWithdrawn   CRLReasonCode = 9
-	CRLReasonAACompromise         CRLReasonCode = 10
-)
-
-// ErrUnsupportedKey is returned when an unsupported key type is encountered.
-var ErrUnsupportedKey = errors.New("acme: unknown key type; only RSA and ECDSA are supported")
-
-// Error is an ACME error, defined in Problem Details for HTTP APIs doc
-// http://tools.ietf.org/html/draft-ietf-appsawg-http-problem.
-type Error struct {
-	// StatusCode is The HTTP status code generated by the origin server.
-	StatusCode int
-	// ProblemType is a URI reference that identifies the problem type,
-	// typically in a "urn:acme:error:xxx" form.
-	ProblemType string
-	// Detail is a human-readable explanation specific to this occurrence of the problem.
-	Detail string
-	// Header is the original server error response headers.
-	// It may be nil.
-	Header http.Header
-}
-
-func (e *Error) Error() string {
-	return fmt.Sprintf("%d %s: %s", e.StatusCode, e.ProblemType, e.Detail)
-}
-
-// AuthorizationError indicates that an authorization for an identifier
-// did not succeed.
-// It contains all errors from Challenge items of the failed Authorization.
-type AuthorizationError struct {
-	// URI uniquely identifies the failed Authorization.
-	URI string
-
-	// Identifier is an AuthzID.Value of the failed Authorization.
-	Identifier string
-
-	// Errors is a collection of non-nil error values of Challenge items
-	// of the failed Authorization.
-	Errors []error
-}
-
-func (a *AuthorizationError) Error() string {
-	e := make([]string, len(a.Errors))
-	for i, err := range a.Errors {
-		e[i] = err.Error()
-	}
-	return fmt.Sprintf("acme: authorization error for %s: %s", a.Identifier, strings.Join(e, "; "))
-}
-
-// RateLimit reports whether err represents a rate limit error and
-// any Retry-After duration returned by the server.
-//
-// See the following for more details on rate limiting:
-// https://tools.ietf.org/html/draft-ietf-acme-acme-05#section-5.6
-func RateLimit(err error) (time.Duration, bool) {
-	e, ok := err.(*Error)
-	if !ok {
-		return 0, false
-	}
-	// Some CA implementations may return incorrect values.
-	// Use case-insensitive comparison.
-	if !strings.HasSuffix(strings.ToLower(e.ProblemType), ":ratelimited") {
-		return 0, false
-	}
-	if e.Header == nil {
-		return 0, true
-	}
-	return retryAfter(e.Header.Get("Retry-After"), 0), true
-}
-
-// Account is a user account. It is associated with a private key.
-type Account struct {
-	// URI is the account unique ID, which is also a URL used to retrieve
-	// account data from the CA.
-	URI string
-
-	// Contact is a slice of contact info used during registration.
-	Contact []string
-
-	// The terms user has agreed to.
-	// A value not matching CurrentTerms indicates that the user hasn't agreed
-	// to the actual Terms of Service of the CA.
-	AgreedTerms string
-
-	// Actual terms of a CA.
-	CurrentTerms string
-
-	// Authz is the authorization URL used to initiate a new authz flow.
-	Authz string
-
-	// Authorizations is a URI from which a list of authorizations
-	// granted to this account can be fetched via a GET request.
-	Authorizations string
-
-	// Certificates is a URI from which a list of certificates
-	// issued for this account can be fetched via a GET request.
-	Certificates string
-}
-
-// Directory is ACME server discovery data.
-type Directory struct {
-	// RegURL is an account endpoint URL, allowing for creating new
-	// and modifying existing accounts.
-	RegURL string
-
-	// AuthzURL is used to initiate Identifier Authorization flow.
-	AuthzURL string
-
-	// CertURL is a new certificate issuance endpoint URL.
-	CertURL string
-
-	// RevokeURL is used to initiate a certificate revocation flow.
-	RevokeURL string
-
-	// Term is a URI identifying the current terms of service.
-	Terms string
-
-	// Website is an HTTP or HTTPS URL locating a website
-	// providing more information about the ACME server.
-	Website string
-
-	// CAA consists of lowercase hostname elements, which the ACME server
-	// recognises as referring to itself for the purposes of CAA record validation
-	// as defined in RFC6844.
-	CAA []string
-}
-
-// Challenge encodes a returned CA challenge.
-// Its Error field may be non-nil if the challenge is part of an Authorization
-// with StatusInvalid.
-type Challenge struct {
-	// Type is the challenge type, e.g. "http-01", "tls-sni-02", "dns-01".
-	Type string
-
-	// URI is where a challenge response can be posted to.
-	URI string
-
-	// Token is a random value that uniquely identifies the challenge.
-	Token string
-
-	// Status identifies the status of this challenge.
-	Status string
-
-	// Error indicates the reason for an authorization failure
-	// when this challenge was used.
-	// The type of a non-nil value is *Error.
-	Error error
-}
-
-// Authorization encodes an authorization response.
-type Authorization struct {
-	// URI uniquely identifies a authorization.
-	URI string
-
-	// Status identifies the status of an authorization.
-	Status string
-
-	// Identifier is what the account is authorized to represent.
-	Identifier AuthzID
-
-	// Challenges that the client needs to fulfill in order to prove possession
-	// of the identifier (for pending authorizations).
-	// For final authorizations, the challenges that were used.
-	Challenges []*Challenge
-
-	// A collection of sets of challenges, each of which would be sufficient
-	// to prove possession of the identifier.
-	// Clients must complete a set of challenges that covers at least one set.
-	// Challenges are identified by their indices in the challenges array.
-	// If this field is empty, the client needs to complete all challenges.
-	Combinations [][]int
-}
-
-// AuthzID is an identifier that an account is authorized to represent.
-type AuthzID struct {
-	Type  string // The type of identifier, e.g. "dns".
-	Value string // The identifier itself, e.g. "example.org".
-}
-
-// wireAuthz is ACME JSON representation of Authorization objects.
-type wireAuthz struct {
-	Status       string
-	Challenges   []wireChallenge
-	Combinations [][]int
-	Identifier   struct {
-		Type  string
-		Value string
-	}
-}
-
-func (z *wireAuthz) authorization(uri string) *Authorization {
-	a := &Authorization{
-		URI:          uri,
-		Status:       z.Status,
-		Identifier:   AuthzID{Type: z.Identifier.Type, Value: z.Identifier.Value},
-		Combinations: z.Combinations, // shallow copy
-		Challenges:   make([]*Challenge, len(z.Challenges)),
-	}
-	for i, v := range z.Challenges {
-		a.Challenges[i] = v.challenge()
-	}
-	return a
-}
-
-func (z *wireAuthz) error(uri string) *AuthorizationError {
-	err := &AuthorizationError{
-		URI:        uri,
-		Identifier: z.Identifier.Value,
-	}
-	for _, raw := range z.Challenges {
-		if raw.Error != nil {
-			err.Errors = append(err.Errors, raw.Error.error(nil))
-		}
-	}
-	return err
-}
-
-// wireChallenge is ACME JSON challenge representation.
-type wireChallenge struct {
-	URI    string `json:"uri"`
-	Type   string
-	Token  string
-	Status string
-	Error  *wireError
-}
-
-func (c *wireChallenge) challenge() *Challenge {
-	v := &Challenge{
-		URI:    c.URI,
-		Type:   c.Type,
-		Token:  c.Token,
-		Status: c.Status,
-	}
-	if v.Status == "" {
-		v.Status = StatusPending
-	}
-	if c.Error != nil {
-		v.Error = c.Error.error(nil)
-	}
-	return v
-}
-
-// wireError is a subset of fields of the Problem Details object
-// as described in https://tools.ietf.org/html/rfc7807#section-3.1.
-type wireError struct {
-	Status int
-	Type   string
-	Detail string
-}
-
-func (e *wireError) error(h http.Header) *Error {
-	return &Error{
-		StatusCode:  e.Status,
-		ProblemType: e.Type,
-		Detail:      e.Detail,
-		Header:      h,
-	}
-}

vendor/golang.org/x/crypto/ed25519/ed25519.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package ed25519 implements the Ed25519 signature algorithm. See
+// https://ed25519.cr.yp.to/.
+//
+// These functions are also compatible with the “Ed25519” function defined in
+// RFC 8032.
+package ed25519
+
+// This code is a port of the public domain, “ref10” implementation of ed25519
+// from SUPERCOP.
+
+import (
+	"bytes"
+	"crypto"
+	cryptorand "crypto/rand"
+	"crypto/sha512"
+	"errors"
+	"io"
+	"strconv"
+
+	"golang.org/x/crypto/ed25519/internal/edwards25519"
+)
+
+const (
+	// PublicKeySize is the size, in bytes, of public keys as used in this package.
+	PublicKeySize = 32
+	// PrivateKeySize is the size, in bytes, of private keys as used in this package.
+	PrivateKeySize = 64
+	// SignatureSize is the size, in bytes, of signatures generated and verified by this package.
+	SignatureSize = 64
+)
+
+// PublicKey is the type of Ed25519 public keys.
+type PublicKey []byte
+
+// PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
+type PrivateKey []byte
+
+// Public returns the PublicKey corresponding to priv.
+func (priv PrivateKey) Public() crypto.PublicKey {
+	publicKey := make([]byte, PublicKeySize)
+	copy(publicKey, priv[32:])
+	return PublicKey(publicKey)
+}
+
+// Sign signs the given message with priv.
+// Ed25519 performs two passes over messages to be signed and therefore cannot
+// handle pre-hashed messages. Thus opts.HashFunc() must return zero to
+// indicate the message hasn't been hashed. This can be achieved by passing
+// crypto.Hash(0) as the value for opts.
+func (priv PrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) {
+	if opts.HashFunc() != crypto.Hash(0) {
+		return nil, errors.New("ed25519: cannot sign hashed message")
+	}
+
+	return Sign(priv, message), nil
+}
+
+// GenerateKey generates a public/private key pair using entropy from rand.
+// If rand is nil, crypto/rand.Reader will be used.
+func GenerateKey(rand io.Reader) (publicKey PublicKey, privateKey PrivateKey, err error) {
+	if rand == nil {
+		rand = cryptorand.Reader
+	}
+
+	privateKey = make([]byte, PrivateKeySize)
+	publicKey = make([]byte, PublicKeySize)
+	_, err = io.ReadFull(rand, privateKey[:32])
+	if err != nil {
+		return nil, nil, err
+	}
+
+	digest := sha512.Sum512(privateKey[:32])
+	digest[0] &= 248
+	digest[31] &= 127
+	digest[31] |= 64
+
+	var A edwards25519.ExtendedGroupElement
+	var hBytes [32]byte
+	copy(hBytes[:], digest[:])
+	edwards25519.GeScalarMultBase(&A, &hBytes)
+	var publicKeyBytes [32]byte
+	A.ToBytes(&publicKeyBytes)
+
+	copy(privateKey[32:], publicKeyBytes[:])
+	copy(publicKey, publicKeyBytes[:])
+
+	return publicKey, privateKey, nil
+}
+
+// Sign signs the message with privateKey and returns a signature. It will
+// panic if len(privateKey) is not PrivateKeySize.
+func Sign(privateKey PrivateKey, message []byte) []byte {
+	if l := len(privateKey); l != PrivateKeySize {
+		panic("ed25519: bad private key length: " + strconv.Itoa(l))
+	}
+
+	h := sha512.New()
+	h.Write(privateKey[:32])
+
+	var digest1, messageDigest, hramDigest [64]byte
+	var expandedSecretKey [32]byte
+	h.Sum(digest1[:0])
+	copy(expandedSecretKey[:], digest1[:])
+	expandedSecretKey[0] &= 248
+	expandedSecretKey[31] &= 63
+	expandedSecretKey[31] |= 64
+
+	h.Reset()
+	h.Write(digest1[32:])
+	h.Write(message)
+	h.Sum(messageDigest[:0])
+
+	var messageDigestReduced [32]byte
+	edwards25519.ScReduce(&messageDigestReduced, &messageDigest)
+	var R edwards25519.ExtendedGroupElement
+	edwards25519.GeScalarMultBase(&R, &messageDigestReduced)
+
+	var encodedR [32]byte
+	R.ToBytes(&encodedR)
+
+	h.Reset()
+	h.Write(encodedR[:])
+	h.Write(privateKey[32:])
+	h.Write(message)
+	h.Sum(hramDigest[:0])
+	var hramDigestReduced [32]byte
+	edwards25519.ScReduce(&hramDigestReduced, &hramDigest)
+
+	var s [32]byte
+	edwards25519.ScMulAdd(&s, &hramDigestReduced, &expandedSecretKey, &messageDigestReduced)
+
+	signature := make([]byte, SignatureSize)
+	copy(signature[:], encodedR[:])
+	copy(signature[32:], s[:])
+
+	return signature
+}
+
+// Verify reports whether sig is a valid signature of message by publicKey. It
+// will panic if len(publicKey) is not PublicKeySize.
+func Verify(publicKey PublicKey, message, sig []byte) bool {
+	if l := len(publicKey); l != PublicKeySize {
+		panic("ed25519: bad public key length: " + strconv.Itoa(l))
+	}
+
+	if len(sig) != SignatureSize || sig[63]&224 != 0 {
+		return false
+	}
+
+	var A edwards25519.ExtendedGroupElement
+	var publicKeyBytes [32]byte
+	copy(publicKeyBytes[:], publicKey)
+	if !A.FromBytes(&publicKeyBytes) {
+		return false
+	}
+	edwards25519.FeNeg(&A.X, &A.X)
+	edwards25519.FeNeg(&A.T, &A.T)
+
+	h := sha512.New()
+	h.Write(sig[:32])
+	h.Write(publicKey[:])
+	h.Write(message)
+	var digest [64]byte
+	h.Sum(digest[:0])
+
+	var hReduced [32]byte
+	edwards25519.ScReduce(&hReduced, &digest)
+
+	var R edwards25519.ProjectiveGroupElement
+	var s [32]byte
+	copy(s[:], sig[32:])
+
+	// https://tools.ietf.org/html/rfc8032#section-5.1.7 requires that s be in
+	// the range [0, order) in order to prevent signature malleability.
+	if !edwards25519.ScMinimal(&s) {
+		return false
+	}
+
+	edwards25519.GeDoubleScalarMultVartime(&R, &hReduced, &A, &s)
+
+	var checkR [32]byte
+	R.ToBytes(&checkR)
+	return bytes.Equal(sig[:32], checkR[:])
+}

vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package edwards25519
+
+// These values are from the public domain, “ref10” implementation of ed25519
+// from SUPERCOP.
+
+// d is a constant in the Edwards curve equation.
+var d = FieldElement{
+	-10913610, 13857413, -15372611, 6949391, 114729, -8787816, -6275908, -3247719, -18696448, -12055116,
+}
+
+// d2 is 2*d.
+var d2 = FieldElement{
+	-21827239, -5839606, -30745221, 13898782, 229458, 15978800, -12551817, -6495438, 29715968, 9444199,
+}
+
+// SqrtM1 is the square-root of -1 in the field.
+var SqrtM1 = FieldElement{
+	-32595792, -7943725, 9377950, 3500415, 12389472, -272473, -25146209, -2005654, 326686, 11406482,
+}
+
+// A is a constant in the Montgomery-form of curve25519.
+var A = FieldElement{
+	486662, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+}
+
+// bi contains precomputed multiples of the base-point. See the Ed25519 paper
+// for a discussion about how these values are used.
+var bi = [8]PreComputedGroupElement{
+	{
+		FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605},
+		FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378},
+		FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546},
+	},
+	{
+		FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024},
+		FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574},
+		FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357},
+	},
+	{
+		FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380},
+		FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306},
+		FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942},
+	},
+	{
+		FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766},
+		FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701},
+		FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300},
+	},
+	{
+		FieldElement{-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211, -1361450, -13062696, 13821877},
+		FieldElement{-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028, -7212327, 18853322, -14220951},
+		FieldElement{4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358, -10431137, 2207753, -3209784},
+	},
+	{
+		FieldElement{-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364, -663000, -31111463, -16132436},
+		FieldElement{25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789, 15725684, 171356, 6466918},
+		FieldElement{23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339, -14088058, -30714912, 16193877},
+	},
+	{
+		FieldElement{-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398, 4729455, -18074513, 9256800},
+		FieldElement{-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405, 9761698, -19827198, 630305},
+		FieldElement{-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551, -15960994, -2449256, -14291300},
+	},
+	{
+		FieldElement{-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575, 15033784, 25105118, -7894876},
+		FieldElement{-24326370, 15950226, -31801215, -14592823, -11662737, -5090925, 1573892, -2625887, 2198790, -15804619},
+		FieldElement{-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022, -16236442, -32461234, -12290683},
+	},
+}
+
+// base contains precomputed multiples of the base-point. See the Ed25519 paper
+// for a discussion about how these values are used.
+var base = [32][8]PreComputedGroupElement{
+	{
+		{
+			FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605},
+			FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378},
+			FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546},
+		},
+		{
+			FieldElement{-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303},
+			FieldElement{-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -5319081},
+			FieldElement{26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697},
+		},
+		{
+			FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024},
+			FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574},
+			FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357},
+		},
+		{
+			FieldElement{-17036878, 13921892, 10945806, -6033431, 27105052, -16084379, -28926210, 15006023, 3284568, -6276540},
+			FieldElement{23599295, -8306047, -11193664, -7687416, 13236774, 10506355, 7464579, 9656445, 13059162, 10374397},
+			FieldElement{7798556, 16710257, 3033922, 2874086, 28997861, 2835604, 32406664, -3839045, -641708, -101325},
+		},
+		{
+			FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380},
+			FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306},
+			FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942},
+		},
+		{
+			FieldElement{-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777},
+			FieldElement{-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737},
+			FieldElement{-18199695, -15951423, -10473290, 1707278, -17185920, 3916101, -28236412, 3959421, 27914454, 4383652},
+		},
+		{
+			FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766},
+			FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701},
+			FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300},
+		},
+		{
+			FieldElement{14499471, -2729599, -33191113, -4254652, 28494862, 14271267, 30290735, 10876454, -33154098, 2381726},
+			FieldElement{-7195431, -2655363, -14730155, 462251, -27724326, 3941372, -6236617, 3696005, -32300832, 15351955},
+			FieldElement{27431194, 8222322, 16448760, -3907995, -18707002, 11938355, -32961401, -2970515, 29551813, 10109425},
+		},
+	},
+	{
+		{
+			FieldElement{-13657040, -13155431, -31283750, 11777098, 21447386, 6519384, -2378284, -1627556, 10092783, -4764171},
+			FieldElement{27939166, 14210322, 4677035, 16277044, -22964462, -12398139, -32508754, 12005538, -17810127, 12803510},
+			FieldElement{17228999, -15661624, -1233527, 300140, -1224870, -11714777, 30364213, -9038194, 18016357, 4397660},
+		},
+		{
+			FieldElement{-10958843, -7690207, 4776341, -14954238, 27850028, -15602212, -26619106, 14544525, -17477504, 982639},
+			FieldElement{29253598, 15796703, -2863982, -9908884, 10057023, 3163536, 7332899, -4120128, -21047696, 9934963},
+			FieldElement{5793303, 16271923, -24131614, -10116404, 29188560, 1206517, -14747930, 4559895, -30123922, -10897950},
+		},
+		{
+			FieldElement{-27643952, -11493006, 16282657, -11036493, 28414021, -15012264, 24191034, 4541697, -13338309, 5500568},
+			FieldElement{12650548, -1497113, 9052871, 11355358, -17680037, -8400164, -17430592, 12264343, 10874051, 13524335},
+			FieldElement{25556948, -3045990, 714651, 2510400, 23394682, -10415330, 33119038, 5080568, -22528059, 5376628},
+		},
+		{
+			FieldElement{-26088264, -4011052, -17013699, -3537628, -6726793, 1920897, -22321305, -9447443, 4535768, 1569007},
+			FieldElement{-2255422, 14606630, -21692440, -8039818, 28430649, 8775819, -30494562, 3044290, 31848280, 12543772},
+			FieldElement{-22028579, 2943893, -31857513, 6777306, 13784462, -4292203, -27377195, -2062731, 7718482, 14474653},
+		},
+		{
+			FieldElement{2385315, 2454213, -22631320, 46603, -4437935, -15680415, 656965, -7236665, 24316168, -5253567},
+			FieldElement{13741529, 10911568, -33233417, -8603737, -20177830, -1033297, 33040651, -13424532, -20729456, 8321686},
+			FieldElement{21060490, -2212744, 15712757, -4336099, 1639040, 10656336, 23845965, -11874838, -9984458, 608372},
+		},
+		{
+			FieldElement{-13672732, -15087586, -10889693, -7557059, -6036909, 11305547, 1123968, -6780577, 27229399, 23887},
+			FieldElement{-23244140, -294205, -11744728, 14712571, -29465699, -2029617, 12797024, -6440308, -1633405, 16678954},
+			FieldElement{-29500620, 4770662, -16054387, 14001338, 7830047, 9564805, -1508144, -4795045, -17169265, 4904953},
+		},
+		{
+			FieldElement{24059557, 14617003, 19037157, -15039908, 19766093, -14906429, 5169211, 16191880, 2128236, -4326833},
+			FieldElement{-16981152, 4124966, -8540610, -10653797, 30336522, -14105247, -29806336, 916033, -6882542, -2986532},
+			FieldElement{-22630907, 12419372, -7134229, -7473371, -16478904, 16739175, 285431, 2763829, 15736322, 4143876},
+		},
+		{
+			FieldElement{2379352, 11839345, -4110402, -5988665, 11274298, 794957, 212801, -14594663, 23527084, -16458268},
+			FieldElement{33431127, -11130478, -17838966, -15626900, 8909499, 8376530, -32625340, 4087881, -15188911, -14416214},
+			FieldElement{1767683, 7197987, -13205226, -2022635, -13091350, 448826, 5799055, 4357868, -4774191, -16323038},
+		},
+	},
+	{
+		{
+			FieldElement{6721966, 13833823, -23523388, -1551314, 26354293, -11863321, 23365147, -3949732, 7390890, 2759800},
+			FieldElement{4409041, 2052381, 23373853, 10530217, 7676779, -12885954, 21302353, -4264057, 1244380, -12919645},
+			FieldElement{-4421239, 7169619, 4982368, -2957590, 30256825, -2777540, 14086413, 9208236, 15886429, 16489664},
+		},
+		{
+			FieldElement{1996075, 10375649, 14346367, 13311202, -6874135, -16438411, -13693198, 398369, -30606455, -712933},
+			FieldElement{-25307465, 9795880, -2777414, 14878809, -33531835, 14780363, 13348553, 12076947, -30836462, 5113182},
+			FieldElement{-17770784, 11797796, 31950843, 13929123, -25888302, 12288344, -30341101, -7336386, 13847711, 5387222},
+		},
+		{
+			FieldElement{-18582163, -3416217, 17824843, -2340966, 22744343, -10442611, 8763061, 3617786, -19600662, 10370991},
+			FieldElement{20246567, -14369378, 22358229, -543712, 18507283, -10413996, 14554437, -8746092, 32232924, 16763880},
+			FieldElement{9648505, 10094563, 26416693, 14745928, -30374318, -6472621, 11094161, 15689506, 3140038, -16510092},
+		},
+		{
+			FieldElement{-16160072, 5472695, 31895588, 4744994, 8823515, 10365685, -27224800, 9448613, -28774454, 366295},
+			FieldElement{19153450, 11523972, -11096490, -6503142, -24647631, 5420647, 28344573, 8041113, 719605, 11671788},
+			FieldElement{8678025, 2694440, -6808014, 2517372, 4964326, 11152271, -15432916, -15266516, 27000813, -10195553},
+		},
+		{
+			FieldElement{-15157904, 7134312, 8639287, -2814877, -7235688, 10421742, 564065, 5336097, 6750977, -14521026},
+			FieldElement{11836410, -3979488, 26297894, 16080799, 23455045, 15735944, 1695823, -8819122, 8169720, 16220347},
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+			FieldElement{-25493081, -6962928, 32500200, -9419051, -23038724, -2302222, 14898637, 3848455, 20969334, -5157516},
+			FieldElement{-20384450, -14347713, -18336405, 13884722, -33039454, 2842114, -21610826, -3649888, 11177095, 14989547},
+			FieldElement{-24496721, -11716016, 16959896, 2278463, 12066309, 10137771, 13515641, 2581286, -28487508, 9930240},
+		},
+		{
+			FieldElement{-17751622, -2097826, 16544300, -13009300, -15914807, -14949081, 18345767, -13403753, 16291481, -5314038},
+			FieldElement{-33229194, 2553288, 32678213, 9875984, 8534129, 6889387, -9676774, 6957617, 4368891, 9788741},
+			FieldElement{16660756, 7281060, -10830758, 12911820, 20108584, -8101676, -21722536, -8613148, 16250552, -11111103},
+		},
+		{
+			FieldElement{-19765507, 2390526, -16551031, 14161980, 1905286, 6414907, 4689584, 10604807, -30190403, 4782747},
+			FieldElement{-1354539, 14736941, -7367442, -13292886, 7710542, -14155590, -9981571, 4383045, 22546403, 437323},
+			FieldElement{31665577, -12180464, -16186830, 1491339, -18368625, 3294682, 27343084, 2786261, -30633590, -14097016},
+		},
+		{
+			FieldElement{-14467279, -683715, -33374107, 7448552, 19294360, 14334329, -19690631, 2355319, -19284671, -6114373},
+			FieldElement{15121312, -15796162, 6377020, -6031361, -10798111, -12957845, 18952177, 15496498, -29380133, 11754228},
+			FieldElement{-2637277, -13483075, 8488727, -14303896, 12728761, -1622493, 7141596, 11724556, 22761615, -10134141},
+		},
+		{
+			FieldElement{16918416, 11729663, -18083579, 3022987, -31015732, -13339659, -28741185, -12227393, 32851222, 11717399},
+			FieldElement{11166634, 7338049, -6722523, 4531520, -29468672, -7302055, 31474879, 3483633, -1193175, -4030831},
+			FieldElement{-185635, 9921305, 31456609, -13536438, -12013818, 13348923, 33142652, 6546660, -19985279, -3948376},
+		},
+		{
+			FieldElement{-32460596, 11266712, -11197107, -7899103, 31703694, 3855903, -8537131, -12833048, -30772034, -15486313},
+			FieldElement{-18006477, 12709068, 3991746, -6479188, -21491523, -10550425, -31135347, -16049879, 10928917, 3011958},
+			FieldElement{-6957757, -15594337, 31696059, 334240, 29576716, 14796075, -30831056, -12805180, 18008031, 10258577},
+		},
+		{
+			FieldElement{-22448644, 15655569, 7018479, -4410003, -30314266, -1201591, -1853465, 1367120, 25127874, 6671743},
+			FieldElement{29701166, -14373934, -10878120, 9279288, -17568, 13127210, 21382910, 11042292, 25838796, 4642684},
+			FieldElement{-20430234, 14955537, -24126347, 8124619, -5369288, -5990470, 30468147, -13900640, 18423289, 4177476},
+		},
+	},
+}

vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go

+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package edwards25519
+
+import "encoding/binary"
+
+// This code is a port of the public domain, “ref10” implementation of ed25519
+// from SUPERCOP.
+
+// FieldElement represents an element of the field GF(2^255 - 19).  An element
+// t, entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
+// t[3]+2^102 t[4]+...+2^230 t[9].  Bounds on each t[i] vary depending on
+// context.
+type FieldElement [10]int32
+
+var zero FieldElement
+
+func FeZero(fe *FieldElement) {
+	copy(fe[:], zero[:])
+}
+
+func FeOne(fe *FieldElement) {
+	FeZero(fe)
+	fe[0] = 1
+}
+
+func FeAdd(dst, a, b *FieldElement) {
+	dst[0] = a[0] + b[0]
+	dst[1] = a[1] + b[1]
+	dst[2] = a[2] + b[2]
+	dst[3] = a[3] + b[3]
+	dst[4] = a[4] + b[4]
+	dst[5] = a[5] + b[5]
+	dst[6] = a[6] + b[6]
+	dst[7] = a[7] + b[7]
+	dst[8] = a[8] + b[8]
+	dst[9] = a[9] + b[9]
+}
+
+func FeSub(dst, a, b *FieldElement) {
+	dst[0] = a[0] - b[0]
+	dst[1] = a[1] - b[1]
+	dst[2] = a[2] - b[2]
+	dst[3] = a[3] - b[3]
+	dst[4] = a[4] - b[4]
+	dst[5] = a[5] - b[5]
+	dst[6] = a[6] - b[6]
+	dst[7] = a[7] - b[7]
+	dst[8] = a[8] - b[8]
+	dst[9] = a[9] - b[9]
+}
+
+func FeCopy(dst, src *FieldElement) {
+	copy(dst[:], src[:])
+}
+
+// Replace (f,g) with (g,g) if b == 1;
+// replace (f,g) with (f,g) if b == 0.
+//
+// Preconditions: b in {0,1}.
+func FeCMove(f, g *FieldElement, b int32) {
+	b = -b
+	f[0] ^= b & (f[0] ^ g[0])
+	f[1] ^= b & (f[1] ^ g[1])
+	f[2] ^= b & (f[2] ^ g[2])
+	f[3] ^= b & (f[3] ^ g[3])
+	f[4] ^= b & (f[4] ^ g[4])
+	f[5] ^= b & (f[5] ^ g[5])
+	f[6] ^= b & (f[6] ^ g[6])
+	f[7] ^= b & (f[7] ^ g[7])
+	f[8] ^= b & (f[8] ^ g[8])
+	f[9] ^= b & (f[9] ^ g[9])
+}
+
+func load3(in []byte) int64 {
+	var r int64
+	r = int64(in[0])
+	r |= int64(in[1]) << 8
+	r |= int64(in[2]) << 16
+	return r
+}
+
+func load4(in []byte) int64 {
+	var r int64
+	r = int64(in[0])
+	r |= int64(in[1]) << 8
+	r |= int64(in[2]) << 16
+	r |= int64(in[3]) << 24
+	return r
+}
+
+func FeFromBytes(dst *FieldElement, src *[32]byte) {
+	h0 := load4(src[:])
+	h1 := load3(src[4:]) << 6
+	h2 := load3(src[7:]) << 5
+	h3 := load3(src[10:]) << 3
+	h4 := load3(src[13:]) << 2
+	h5 := load4(src[16:])
+	h6 := load3(src[20:]) << 7
+	h7 := load3(src[23:]) << 5
+	h8 := load3(src[26:]) << 4
+	h9 := (load3(src[29:]) & 8388607) << 2
+
+	FeCombine(dst, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
+}
+
+// FeToBytes marshals h to s.
+// Preconditions:
+//   |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+//
+// Write p=2^255-19; q=floor(h/p).
+// Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))).
+//
+// Proof:
+//   Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4.
+//   Also have |h-2^230 h9|<2^230 so |19 2^(-255)(h-2^230 h9)|<1/4.
+//
+//   Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9).
+//   Then 0<y<1.
+//
+//   Write r=h-pq.
+//   Have 0<=r<=p-1=2^255-20.
+//   Thus 0<=r+19(2^-255)r<r+19(2^-255)2^255<=2^255-1.
+//
+//   Write x=r+19(2^-255)r+y.
+//   Then 0<x<2^255 so floor(2^(-255)x) = 0 so floor(q+2^(-255)x) = q.
+//
+//   Have q+2^(-255)x = 2^(-255)(h + 19 2^(-25) h9 + 2^(-1))
+//   so floor(2^(-255)(h + 19 2^(-25) h9 + 2^(-1))) = q.
+func FeToBytes(s *[32]byte, h *FieldElement) {
+	var carry [10]int32
+
+	q := (19*h[9] + (1 << 24)) >> 25
+	q = (h[0] + q) >> 26
+	q = (h[1] + q) >> 25
+	q = (h[2] + q) >> 26
+	q = (h[3] + q) >> 25
+	q = (h[4] + q) >> 26
+	q = (h[5] + q) >> 25
+	q = (h[6] + q) >> 26
+	q = (h[7] + q) >> 25
+	q = (h[8] + q) >> 26
+	q = (h[9] + q) >> 25
+
+	// Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20.
+	h[0] += 19 * q
+	// Goal: Output h-2^255 q, which is between 0 and 2^255-20.
+
+	carry[0] = h[0] >> 26
+	h[1] += carry[0]
+	h[0] -= carry[0] << 26
+	carry[1] = h[1] >> 25
+	h[2] += carry[1]
+	h[1] -= carry[1] << 25
+	carry[2] = h[2] >> 26
+	h[3] += carry[2]
+	h[2] -= carry[2] << 26
+	carry[3] = h[3] >> 25
+	h[4] += carry[3]
+	h[3] -= carry[3] << 25
+	carry[4] = h[4] >> 26
+	h[5] += carry[4]
+	h[4] -= carry[4] << 26
+	carry[5] = h[5] >> 25
+	h[6] += carry[5]
+	h[5] -= carry[5] << 25
+	carry[6] = h[6] >> 26
+	h[7] += carry[6]
+	h[6] -= carry[6] << 26
+	carry[7] = h[7] >> 25
+	h[8] += carry[7]
+	h[7] -= carry[7] << 25
+	carry[8] = h[8] >> 26
+	h[9] += carry[8]
+	h[8] -= carry[8] << 26
+	carry[9] = h[9] >> 25
+	h[9] -= carry[9] << 25
+	// h10 = carry9
+
+	// Goal: Output h[0]+...+2^255 h10-2^255 q, which is between 0 and 2^255-20.
+	// Have h[0]+...+2^230 h[9] between 0 and 2^255-1;
+	// evidently 2^255 h10-2^255 q = 0.
+	// Goal: Output h[0]+...+2^230 h[9].
+
+	s[0] = byte(h[0] >> 0)
+	s[1] = byte(h[0] >> 8)
+	s[2] = byte(h[0] >> 16)
+	s[3] = byte((h[0] >> 24) | (h[1] << 2))
+	s[4] = byte(h[1] >> 6)
+	s[5] = byte(h[1] >> 14)
+	s[6] = byte((h[1] >> 22) | (h[2] << 3))
+	s[7] = byte(h[2] >> 5)
+	s[8] = byte(h[2] >> 13)
+	s[9] = byte((h[2] >> 21) | (h[3] << 5))
+	s[10] = byte(h[3] >> 3)
+	s[11] = byte(h[3] >> 11)
+	s[12] = byte((h[3] >> 19) | (h[4] << 6))
+	s[13] = byte(h[4] >> 2)
+	s[14] = byte(h[4] >> 10)
+	s[15] = byte(h[4] >> 18)
+	s[16] = byte(h[5] >> 0)
+	s[17] = byte(h[5] >> 8)
+	s[18] = byte(h[5] >> 16)
+	s[19] = byte((h[5] >> 24) | (h[6] << 1))
+	s[20] = byte(h[6] >> 7)
+	s[21] = byte(h[6] >> 15)
+	s[22] = byte((h[6] >> 23) | (h[7] << 3))
+	s[23] = byte(h[7] >> 5)
+	s[24] = byte(h[7] >> 13)
+	s[25] = byte((h[7] >> 21) | (h[8] << 4))
+	s[26] = byte(h[8] >> 4)
+	s[27] = byte(h[8] >> 12)
+	s[28] = byte((h[8] >> 20) | (h[9] << 6))
+	s[29] = byte(h[9] >> 2)
+	s[30] = byte(h[9] >> 10)
+	s[31] = byte(h[9] >> 18)
+}
+
+func FeIsNegative(f *FieldElement) byte {
+	var s [32]byte
+	FeToBytes(&s, f)
+	return s[0] & 1
+}
+
+func FeIsNonZero(f *FieldElement) int32 {
+	var s [32]byte
+	FeToBytes(&s, f)
+	var x uint8
+	for _, b := range s {
+		x |= b
+	}
+	x |= x >> 4
+	x |= x >> 2
+	x |= x >> 1
+	return int32(x & 1)
+}
+
+// FeNeg sets h = -f
+//
+// Preconditions:
+//    |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+//
+// Postconditions:
+//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+func FeNeg(h, f *FieldElement) {
+	h[0] = -f[0]
+	h[1] = -f[1]
+	h[2] = -f[2]
+	h[3] = -f[3]
+	h[4] = -f[4]
+	h[5] = -f[5]
+	h[6] = -f[6]
+	h[7] = -f[7]
+	h[8] = -f[8]
+	h[9] = -f[9]
+}
+
+func FeCombine(h *FieldElement, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) {
+	var c0, c1, c2, c3, c4, c5, c6, c7, c8, c9 int64
+
+	/*
+	  |h0| <= (1.1*1.1*2^52*(1+19+19+19+19)+1.1*1.1*2^50*(38+38+38+38+38))
+	    i.e. |h0| <= 1.2*2^59; narrower ranges for h2, h4, h6, h8
+	  |h1| <= (1.1*1.1*2^51*(1+1+19+19+19+19+19+19+19+19))
+	    i.e. |h1| <= 1.5*2^58; narrower ranges for h3, h5, h7, h9
+	*/
+
+	c0 = (h0 + (1 << 25)) >> 26
+	h1 += c0
+	h0 -= c0 << 26
+	c4 = (h4 + (1 << 25)) >> 26
+	h5 += c4
+	h4 -= c4 << 26
+	/* |h0| <= 2^25 */
+	/* |h4| <= 2^25 */
+	/* |h1| <= 1.51*2^58 */
+	/* |h5| <= 1.51*2^58 */
+
+	c1 = (h1 + (1 << 24)) >> 25
+	h2 += c1
+	h1 -= c1 << 25
+	c5 = (h5 + (1 << 24)) >> 25
+	h6 += c5
+	h5 -= c5 << 25
+	/* |h1| <= 2^24; from now on fits into int32 */
+	/* |h5| <= 2^24; from now on fits into int32 */
+	/* |h2| <= 1.21*2^59 */
+	/* |h6| <= 1.21*2^59 */
+
+	c2 = (h2 + (1 << 25)) >> 26
+	h3 += c2
+	h2 -= c2 << 26
+	c6 = (h6 + (1 << 25)) >> 26
+	h7 += c6
+	h6 -= c6 << 26
+	/* |h2| <= 2^25; from now on fits into int32 unchanged */
+	/* |h6| <= 2^25; from now on fits into int32 unchanged */
+	/* |h3| <= 1.51*2^58 */
+	/* |h7| <= 1.51*2^58 */
+
+	c3 = (h3 + (1 << 24)) >> 25
+	h4 += c3
+	h3 -= c3 << 25
+	c7 = (h7 + (1 << 24)) >> 25
+	h8 += c7
+	h7 -= c7 << 25
+	/* |h3| <= 2^24; from now on fits into int32 unchanged */
+	/* |h7| <= 2^24; from now on fits into int32 unchanged */
+	/* |h4| <= 1.52*2^33 */
+	/* |h8| <= 1.52*2^33 */
+
+	c4 = (h4 + (1 << 25)) >> 26
+	h5 += c4
+	h4 -= c4 << 26
+	c8 = (h8 + (1 << 25)) >> 26
+	h9 += c8
+	h8 -= c8 << 26
+	/* |h4| <= 2^25; from now on fits into int32 unchanged */
+	/* |h8| <= 2^25; from now on fits into int32 unchanged */
+	/* |h5| <= 1.01*2^24 */
+	/* |h9| <= 1.51*2^58 */
+
+	c9 = (h9 + (1 << 24)) >> 25
+	h0 += c9 * 19
+	h9 -= c9 << 25
+	/* |h9| <= 2^24; from now on fits into int32 unchanged */
+	/* |h0| <= 1.8*2^37 */
+
+	c0 = (h0 + (1 << 25)) >> 26
+	h1 += c0
+	h0 -= c0 << 26
+	/* |h0| <= 2^25; from now on fits into int32 unchanged */
+	/* |h1| <= 1.01*2^24 */
+
+	h[0] = int32(h0)
+	h[1] = int32(h1)
+	h[2] = int32(h2)
+	h[3] = int32(h3)
+	h[4] = int32(h4)
+	h[5] = int32(h5)
+	h[6] = int32(h6)
+	h[7] = int32(h7)
+	h[8] = int32(h8)
+	h[9] = int32(h9)
+}
+
+// FeMul calculates h = f * g
+// Can overlap h with f or g.
+//
+// Preconditions:
+//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+//    |g| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+//
+// Postconditions:
+//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+//
+// Notes on implementation strategy:
+//
+// Using schoolbook multiplication.
+// Karatsuba would save a little in some cost models.
+//
+// Most multiplications by 2 and 19 are 32-bit precomputations;
+// cheaper than 64-bit postcomputations.
+//
+// There is one remaining multiplication by 19 in the carry chain;
+// one *19 precomputation can be merged into this,
+// but the resulting data flow is considerably less clean.
+//
+// There are 12 carries below.
+// 10 of them are 2-way parallelizable and vectorizable.
+// Can get away with 11 carries, but then data flow is much deeper.
+//
+// With tighter constraints on inputs, can squeeze carries into int32.
+func FeMul(h, f, g *FieldElement) {
+	f0 := int64(f[0])
+	f1 := int64(f[1])
+	f2 := int64(f[2])
+	f3 := int64(f[3])
+	f4 := int64(f[4])
+	f5 := int64(f[5])
+	f6 := int64(f[6])
+	f7 := int64(f[7])
+	f8 := int64(f[8])
+	f9 := int64(f[9])
+
+	f1_2 := int64(2 * f[1])
+	f3_2 := int64(2 * f[3])
+	f5_2 := int64(2 * f[5])
+	f7_2 := int64(2 * f[7])
+	f9_2 := int64(2 * f[9])
+
+	g0 := int64(g[0])
+	g1 := int64(g[1])
+	g2 := int64(g[2])
+	g3 := int64(g[3])
+	g4 := int64(g[4])
+	g5 := int64(g[5])
+	g6 := int64(g[6])
+	g7 := int64(g[7])
+	g8 := int64(g[8])
+	g9 := int64(g[9])
+
+	g1_19 := int64(19 * g[1]) /* 1.4*2^29 */
+	g2_19 := int64(19 * g[2]) /* 1.4*2^30; still ok */
+	g3_19 := int64(19 * g[3])
+	g4_19 := int64(19 * g[4])
+	g5_19 := int64(19 * g[5])
+	g6_19 := int64(19 * g[6])
+	g7_19 := int64(19 * g[7])
+	g8_19 := int64(19 * g[8])
+	g9_19 := int64(19 * g[9])
+
+	h0 := f0*g0 + f1_2*g9_19 + f2*g8_19 + f3_2*g7_19 + f4*g6_19 + f5_2*g5_19 + f6*g4_19 + f7_2*g3_19 + f8*g2_19 + f9_2*g1_19
+	h1 := f0*g1 + f1*g0 + f2*g9_19 + f3*g8_19 + f4*g7_19 + f5*g6_19 + f6*g5_19 + f7*g4_19 + f8*g3_19 + f9*g2_19
+	h2 := f0*g2 + f1_2*g1 + f2*g0 + f3_2*g9_19 + f4*g8_19 + f5_2*g7_19 + f6*g6_19 + f7_2*g5_19 + f8*g4_19 + f9_2*g3_19
+	h3 := f0*g3 + f1*g2 + f2*g1 + f3*g0 + f4*g9_19 + f5*g8_19 + f6*g7_19 + f7*g6_19 + f8*g5_19 + f9*g4_19
+	h4 := f0*g4 + f1_2*g3 + f2*g2 + f3_2*g1 + f4*g0 + f5_2*g9_19 + f6*g8_19 + f7_2*g7_19 + f8*g6_19 + f9_2*g5_19
+	h5 := f0*g5 + f1*g4 + f2*g3 + f3*g2 + f4*g1 + f5*g0 + f6*g9_19 + f7*g8_19 + f8*g7_19 + f9*g6_19
+	h6 := f0*g6 + f1_2*g5 + f2*g4 + f3_2*g3 + f4*g2 + f5_2*g1 + f6*g0 + f7_2*g9_19 + f8*g8_19 + f9_2*g7_19
+	h7 := f0*g7 + f1*g6 + f2*g5 + f3*g4 + f4*g3 + f5*g2 + f6*g1 + f7*g0 + f8*g9_19 + f9*g8_19
+	h8 := f0*g8 + f1_2*g7 + f2*g6 + f3_2*g5 + f4*g4 + f5_2*g3 + f6*g2 + f7_2*g1 + f8*g0 + f9_2*g9_19
+	h9 := f0*g9 + f1*g8 + f2*g7 + f3*g6 + f4*g5 + f5*g4 + f6*g3 + f7*g2 + f8*g1 + f9*g0
+
+	FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
+}
+
+func feSquare(f *FieldElement) (h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) {
+	f0 := int64(f[0])
+	f1 := int64(f[1])
+	f2 := int64(f[2])
+	f3 := int64(f[3])
+	f4 := int64(f[4])
+	f5 := int64(f[5])
+	f6 := int64(f[6])
+	f7 := int64(f[7])
+	f8 := int64(f[8])
+	f9 := int64(f[9])
+	f0_2 := int64(2 * f[0])
+	f1_2 := int64(2 * f[1])
+	f2_2 := int64(2 * f[2])
+	f3_2 := int64(2 * f[3])
+	f4_2 := int64(2 * f[4])
+	f5_2 := int64(2 * f[5])
+	f6_2 := int64(2 * f[6])
+	f7_2 := int64(2 * f[7])
+	f5_38 := 38 * f5 // 1.31*2^30
+	f6_19 := 19 * f6 // 1.31*2^30
+	f7_38 := 38 * f7 // 1.31*2^30
+	f8_19 := 19 * f8 // 1.31*2^30
+	f9_38 := 38 * f9 // 1.31*2^30
+
+	h0 = f0*f0 + f1_2*f9_38 + f2_2*f8_19 + f3_2*f7_38 + f4_2*f6_19 + f5*f5_38
+	h1 = f0_2*f1 + f2*f9_38 + f3_2*f8_19 + f4*f7_38 + f5_2*f6_19
+	h2 = f0_2*f2 + f1_2*f1 + f3_2*f9_38 + f4_2*f8_19 + f5_2*f7_38 + f6*f6_19
+	h3 = f0_2*f3 + f1_2*f2 + f4*f9_38 + f5_2*f8_19 + f6*f7_38
+	h4 = f0_2*f4 + f1_2*f3_2 + f2*f2 + f5_2*f9_38 + f6_2*f8_19 + f7*f7_38
+	h5 = f0_2*f5 + f1_2*f4 + f2_2*f3 + f6*f9_38 + f7_2*f8_19
+	h6 = f0_2*f6 + f1_2*f5_2 + f2_2*f4 + f3_2*f3 + f7_2*f9_38 + f8*f8_19
+	h7 = f0_2*f7 + f1_2*f6 + f2_2*f5 + f3_2*f4 + f8*f9_38
+	h8 = f0_2*f8 + f1_2*f7_2 + f2_2*f6 + f3_2*f5_2 + f4*f4 + f9*f9_38
+	h9 = f0_2*f9 + f1_2*f8 + f2_2*f7 + f3_2*f6 + f4_2*f5
+
+	return
+}
+
+// FeSquare calculates h = f*f. Can overlap h with f.
+//
+// Preconditions:
+//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+//
+// Postconditions:
+//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+func FeSquare(h, f *FieldElement) {
+	h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f)
+	FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
+}
+
+// FeSquare2 sets h = 2 * f * f
+//
+// Can overlap h with f.
+//
+// Preconditions:
+//    |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
+//
+// Postconditions:
+//    |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
+// See fe_mul.c for discussion of implementation strategy.
+func FeSquare2(h, f *FieldElement) {
+	h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f)
+
+	h0 += h0
+	h1 += h1
+	h2 += h2
+	h3 += h3
+	h4 += h4
+	h5 += h5
+	h6 += h6
+	h7 += h7
+	h8 += h8
+	h9 += h9
+
+	FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
+}
+
+func FeInvert(out, z *FieldElement) {
+	var t0, t1, t2, t3 FieldElement
+	var i int
+
+	FeSquare(&t0, z)        // 2^1
+	FeSquare(&t1, &t0)      // 2^2
+	for i = 1; i < 2; i++ { // 2^3
+		FeSquare(&t1, &t1)
+	}
+	FeMul(&t1, z, &t1)      // 2^3 + 2^0
+	FeMul(&t0, &t0, &t1)    // 2^3 + 2^1 + 2^0
+	FeSquare(&t2, &t0)      // 2^4 + 2^2 + 2^1
+	FeMul(&t1, &t1, &t2)    // 2^4 + 2^3 + 2^2 + 2^1 + 2^0
+	FeSquare(&t2, &t1)      // 5,4,3,2,1
+	for i = 1; i < 5; i++ { // 9,8,7,6,5
+		FeSquare(&t2, &t2)
+	}
+	FeMul(&t1, &t2, &t1)     // 9,8,7,6,5,4,3,2,1,0
+	FeSquare(&t2, &t1)       // 10..1
+	for i = 1; i < 10; i++ { // 19..10
+		FeSquare(&t2, &t2)
+	}
+	FeMul(&t2, &t2, &t1)     // 19..0
+	FeSquare(&t3, &t2)       // 20..1
+	for i = 1; i < 20; i++ { // 39..20
+		FeSquare(&t3, &t3)
+	}
+	FeMul(&t2, &t3, &t2)     // 39..0
+	FeSquare(&t2, &t2)       // 40..1
+	for i = 1; i < 10; i++ { // 49..10
+		FeSquare(&t2, &t2)
+	}
+	FeMul(&t1, &t2, &t1)     // 49..0
+	FeSquare(&t2, &t1)       // 50..1
+	for i = 1; i < 50; i++ { // 99..50
+		FeSquare(&t2, &t2)
+	}
+	FeMul(&t2, &t2, &t1)      // 99..0
+	FeSquare(&t3, &t2)        // 100..1
+	for i = 1; i < 100; i++ { // 199..100
+		FeSquare(&t3, &t3)
+	}
+	FeMul(&t2, &t3, &t2)     // 199..0
+	FeSquare(&t2, &t2)       // 200..1
+	for i = 1; i < 50; i++ { // 249..50
+		FeSquare(&t2, &t2)
+	}
+	FeMul(&t1, &t2, &t1)    // 249..0
+	FeSquare(&t1, &t1)      // 250..1
+	for i = 1; i < 5; i++ { // 254..5
+		FeSquare(&t1, &t1)
+	}
+	FeMul(out, &t1, &t0) // 254..5,3,1,0
+}
+
+func fePow22523(out, z *FieldElement) {
+	var t0, t1, t2 FieldElement
+	var i int
+
+	FeSquare(&t0, z)
+	for i = 1; i < 1; i++ {
+		FeSquare(&t0, &t0)
+	}
+	FeSquare(&t1, &t0)
+	for i = 1; i < 2; i++ {
+		FeSquare(&t1, &t1)
+	}
+	FeMul(&t1, z, &t1)
+	FeMul(&t0, &t0, &t1)
+	FeSquare(&t0, &t0)
+	for i = 1; i < 1; i++ {
+		FeSquare(&t0, &t0)
+	}
+	FeMul(&t0, &t1, &t0)
+	FeSquare(&t1, &t0)
+	for i = 1; i < 5; i++ {
+		FeSquare(&t1, &t1)
+	}
+	FeMul(&t0, &t1, &t0)
+	FeSquare(&t1, &t0)
+	for i = 1; i < 10; i++ {
+		FeSquare(&t1, &t1)
+	}
+	FeMul(&t1, &t1, &t0)
+	FeSquare(&t2, &t1)
+	for i = 1; i < 20; i++ {
+		FeSquare(&t2, &t2)
+	}
+	FeMul(&t1, &t2, &t1)
+	FeSquare(&t1, &t1)
+	for i = 1; i < 10; i++ {
+		FeSquare(&t1, &t1)
+	}
+	FeMul(&t0, &t1, &t0)
+	FeSquare(&t1, &t0)
+	for i = 1; i < 50; i++ {
+		FeSquare(&t1, &t1)
+	}
+	FeMul(&t1, &t1, &t0)
+	FeSquare(&t2, &t1)
+	for i = 1; i < 100; i++ {
+		FeSquare(&t2, &t2)
+	}
+	FeMul(&t1, &t2, &t1)
+	FeSquare(&t1, &t1)
+	for i = 1; i < 50; i++ {
+		FeSquare(&t1, &t1)
+	}
+	FeMul(&t0, &t1, &t0)
+	FeSquare(&t0, &t0)
+	for i = 1; i < 2; i++ {
+		FeSquare(&t0, &t0)
+	}
+	FeMul(out, &t0, z)
+}
+
+// Group elements are members of the elliptic curve -x^2 + y^2 = 1 + d * x^2 *
+// y^2 where d = -121665/121666.
+//
+// Several representations are used:
+//   ProjectiveGroupElement: (X:Y:Z) satisfying x=X/Z, y=Y/Z
+//   ExtendedGroupElement: (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
+//   CompletedGroupElement: ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
+//   PreComputedGroupElement: (y+x,y-x,2dxy)
+
+type ProjectiveGroupElement struct {
+	X, Y, Z FieldElement
+}
+
+type ExtendedGroupElement struct {
+	X, Y, Z, T FieldElement
+}
+
+type CompletedGroupElement struct {
+	X, Y, Z, T FieldElement
+}
+
+type PreComputedGroupElement struct {
+	yPlusX, yMinusX, xy2d FieldElement
+}
+
+type CachedGroupElement struct {
+	yPlusX, yMinusX, Z, T2d FieldElement
+}
+
+func (p *ProjectiveGroupElement) Zero() {
+	FeZero(&p.X)
+	FeOne(&p.Y)
+	FeOne(&p.Z)
+}
+
+func (p *ProjectiveGroupElement) Double(r *CompletedGroupElement) {
+	var t0 FieldElement
+
+	FeSquare(&r.X, &p.X)
+	FeSquare(&r.Z, &p.Y)
+	FeSquare2(&r.T, &p.Z)
+	FeAdd(&r.Y, &p.X, &p.Y)
+	FeSquare(&t0, &r.Y)
+	FeAdd(&r.Y, &r.Z, &r.X)
+	FeSub(&r.Z, &r.Z, &r.X)
+	FeSub(&r.X, &t0, &r.Y)
+	FeSub(&r.T, &r.T, &r.Z)
+}
+
+func (p *ProjectiveGroupElement) ToBytes(s *[32]byte) {
+	var recip, x, y FieldElement
+
+	FeInvert(&recip, &p.Z)
+	FeMul(&x, &p.X, &recip)
+	FeMul(&y, &p.Y, &recip)
+	FeToBytes(s, &y)
+	s[31] ^= FeIsNegative(&x) << 7
+}
+
+func (p *ExtendedGroupElement) Zero() {
+	FeZero(&p.X)
+	FeOne(&p.Y)
+	FeOne(&p.Z)
+	FeZero(&p.T)
+}
+
+func (p *ExtendedGroupElement) Double(r *CompletedGroupElement) {
+	var q ProjectiveGroupElement
+	p.ToProjective(&q)
+	q.Double(r)
+}
+
+func (p *ExtendedGroupElement) ToCached(r *CachedGroupElement) {
+	FeAdd(&r.yPlusX, &p.Y, &p.X)
+	FeSub(&r.yMinusX, &p.Y, &p.X)
+	FeCopy(&r.Z, &p.Z)
+	FeMul(&r.T2d, &p.T, &d2)
+}
+
+func (p *ExtendedGroupElement) ToProjective(r *ProjectiveGroupElement) {
+	FeCopy(&r.X, &p.X)
+	FeCopy(&r.Y, &p.Y)
+	FeCopy(&r.Z, &p.Z)
+}
+
+func (p *ExtendedGroupElement) ToBytes(s *[32]byte) {
+	var recip, x, y FieldElement
+
+	FeInvert(&recip, &p.Z)
+	FeMul(&x, &p.X, &recip)
+	FeMul(&y, &p.Y, &recip)
+	FeToBytes(s, &y)
+	s[31] ^= FeIsNegative(&x) << 7
+}
+
+func (p *ExtendedGroupElement) FromBytes(s *[32]byte) bool {
+	var u, v, v3, vxx, check FieldElement
+
+	FeFromBytes(&p.Y, s)
+	FeOne(&p.Z)
+	FeSquare(&u, &p.Y)
+	FeMul(&v, &u, &d)
+	FeSub(&u, &u, &p.Z) // y = y^2-1
+	FeAdd(&v, &v, &p.Z) // v = dy^2+1
+
+	FeSquare(&v3, &v)
+	FeMul(&v3, &v3, &v) // v3 = v^3
+	FeSquare(&p.X, &v3)
+	FeMul(&p.X, &p.X, &v)
+	FeMul(&p.X, &p.X, &u) // x = uv^7
+
+	fePow22523(&p.X, &p.X) // x = (uv^7)^((q-5)/8)
+	FeMul(&p.X, &p.X, &v3)
+	FeMul(&p.X, &p.X, &u) // x = uv^3(uv^7)^((q-5)/8)
+
+	var tmpX, tmp2 [32]byte
+
+	FeSquare(&vxx, &p.X)
+	FeMul(&vxx, &vxx, &v)
+	FeSub(&check, &vxx, &u) // vx^2-u
+	if FeIsNonZero(&check) == 1 {
+		FeAdd(&check, &vxx, &u) // vx^2+u
+		if FeIsNonZero(&check) == 1 {
+			return false
+		}
+		FeMul(&p.X, &p.X, &SqrtM1)
+
+		FeToBytes(&tmpX, &p.X)
+		for i, v := range tmpX {
+			tmp2[31-i] = v
+		}
+	}
+
+	if FeIsNegative(&p.X) != (s[31] >> 7) {
+		FeNeg(&p.X, &p.X)
+	}
+
+	FeMul(&p.T, &p.X, &p.Y)
+	return true
+}
+
+func (p *CompletedGroupElement) ToProjective(r *ProjectiveGroupElement) {
+	FeMul(&r.X, &p.X, &p.T)
+	FeMul(&r.Y, &p.Y, &p.Z)
+	FeMul(&r.Z, &p.Z, &p.T)
+}
+
+func (p *CompletedGroupElement) ToExtended(r *ExtendedGroupElement) {
+	FeMul(&r.X, &p.X, &p.T)
+	FeMul(&r.Y, &p.Y, &p.Z)
+	FeMul(&r.Z, &p.Z, &p.T)
+	FeMul(&r.T, &p.X, &p.Y)
+}
+
+func (p *PreComputedGroupElement) Zero() {
+	FeOne(&p.yPlusX)
+	FeOne(&p.yMinusX)
+	FeZero(&p.xy2d)
+}
+
+func geAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) {
+	var t0 FieldElement
+
+	FeAdd(&r.X, &p.Y, &p.X)
+	FeSub(&r.Y, &p.Y, &p.X)
+	FeMul(&r.Z, &r.X, &q.yPlusX)
+	FeMul(&r.Y, &r.Y, &q.yMinusX)
+	FeMul(&r.T, &q.T2d, &p.T)
+	FeMul(&r.X, &p.Z, &q.Z)
+	FeAdd(&t0, &r.X, &r.X)
+	FeSub(&r.X, &r.Z, &r.Y)
+	FeAdd(&r.Y, &r.Z, &r.Y)
+	FeAdd(&r.Z, &t0, &r.T)
+	FeSub(&r.T, &t0, &r.T)
+}
+
+func geSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) {
+	var t0 FieldElement
+
+	FeAdd(&r.X, &p.Y, &p.X)
+	FeSub(&r.Y, &p.Y, &p.X)
+	FeMul(&r.Z, &r.X, &q.yMinusX)
+	FeMul(&r.Y, &r.Y, &q.yPlusX)
+	FeMul(&r.T, &q.T2d, &p.T)
+	FeMul(&r.X, &p.Z, &q.Z)
+	FeAdd(&t0, &r.X, &r.X)
+	FeSub(&r.X, &r.Z, &r.Y)
+	FeAdd(&r.Y, &r.Z, &r.Y)
+	FeSub(&r.Z, &t0, &r.T)
+	FeAdd(&r.T, &t0, &r.T)
+}
+
+func geMixedAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) {
+	var t0 FieldElement
+
+	FeAdd(&r.X, &p.Y, &p.X)
+	FeSub(&r.Y, &p.Y, &p.X)
+	FeMul(&r.Z, &r.X, &q.yPlusX)
+	FeMul(&r.Y, &r.Y, &q.yMinusX)
+	FeMul(&r.T, &q.xy2d, &p.T)
+	FeAdd(&t0, &p.Z, &p.Z)
+	FeSub(&r.X, &r.Z, &r.Y)
+	FeAdd(&r.Y, &r.Z, &r.Y)
+	FeAdd(&r.Z, &t0, &r.T)
+	FeSub(&r.T, &t0, &r.T)
+}
+
+func geMixedSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) {
+	var t0 FieldElement
+
+	FeAdd(&r.X, &p.Y, &p.X)
+	FeSub(&r.Y, &p.Y, &p.X)
+	FeMul(&r.Z, &r.X, &q.yMinusX)
+	FeMul(&r.Y, &r.Y, &q.yPlusX)
+	FeMul(&r.T, &q.xy2d, &p.T)
+	FeAdd(&t0, &p.Z, &p.Z)
+	FeSub(&r.X, &r.Z, &r.Y)
+	FeAdd(&r.Y, &r.Z, &r.Y)
+	FeSub(&r.Z, &t0, &r.T)
+	FeAdd(&r.T, &t0, &r.T)
+}
+
+func slide(r *[256]int8, a *[32]byte) {
+	for i := range r {
+		r[i] = int8(1 & (a[i>>3] >> uint(i&7)))
+	}
+
+	for i := range r {
+		if r[i] != 0 {
+			for b := 1; b <= 6 && i+b < 256; b++ {
+				if r[i+b] != 0 {
+					if r[i]+(r[i+b]<<uint(b)) <= 15 {
+						r[i] += r[i+b] << uint(b)
+						r[i+b] = 0
+					} else if r[i]-(r[i+b]<<uint(b)) >= -15 {
+						r[i] -= r[i+b] << uint(b)
+						for k := i + b; k < 256; k++ {
+							if r[k] == 0 {
+								r[k] = 1
+								break
+							}
+							r[k] = 0
+						}
+					} else {
+						break
+					}
+				}
+			}
+		}
+	}
+}
+
+// GeDoubleScalarMultVartime sets r = a*A + b*B
+// where a = a[0]+256*a[1]+...+256^31 a[31].
+// and b = b[0]+256*b[1]+...+256^31 b[31].
+// B is the Ed25519 base point (x,4/5) with x positive.
+func GeDoubleScalarMultVartime(r *ProjectiveGroupElement, a *[32]byte, A *ExtendedGroupElement, b *[32]byte) {
+	var aSlide, bSlide [256]int8
+	var Ai [8]CachedGroupElement // A,3A,5A,7A,9A,11A,13A,15A
+	var t CompletedGroupElement
+	var u, A2 ExtendedGroupElement
+	var i int
+
+	slide(&aSlide, a)
+	slide(&bSlide, b)
+
+	A.ToCached(&Ai[0])
+	A.Double(&t)
+	t.ToExtended(&A2)
+
+	for i := 0; i < 7; i++ {
+		geAdd(&t, &A2, &Ai[i])
+		t.ToExtended(&u)
+		u.ToCached(&Ai[i+1])
+	}
+
+	r.Zero()
+
+	for i = 255; i >= 0; i-- {
+		if aSlide[i] != 0 || bSlide[i] != 0 {
+			break
+		}
+	}
+
+	for ; i >= 0; i-- {
+		r.Double(&t)
+
+		if aSlide[i] > 0 {
+			t.ToExtended(&u)
+			geAdd(&t, &u, &Ai[aSlide[i]/2])
+		} else if aSlide[i] < 0 {
+			t.ToExtended(&u)
+			geSub(&t, &u, &Ai[(-aSlide[i])/2])
+		}
+
+		if bSlide[i] > 0 {
+			t.ToExtended(&u)
+			geMixedAdd(&t, &u, &bi[bSlide[i]/2])
+		} else if bSlide[i] < 0 {
+			t.ToExtended(&u)
+			geMixedSub(&t, &u, &bi[(-bSlide[i])/2])
+		}
+
+		t.ToProjective(r)
+	}
+}
+
+// equal returns 1 if b == c and 0 otherwise, assuming that b and c are
+// non-negative.
+func equal(b, c int32) int32 {
+	x := uint32(b ^ c)
+	x--
+	return int32(x >> 31)
+}
+
+// negative returns 1 if b < 0 and 0 otherwise.
+func negative(b int32) int32 {
+	return (b >> 31) & 1
+}
+
+func PreComputedGroupElementCMove(t, u *PreComputedGroupElement, b int32) {
+	FeCMove(&t.yPlusX, &u.yPlusX, b)
+	FeCMove(&t.yMinusX, &u.yMinusX, b)
+	FeCMove(&t.xy2d, &u.xy2d, b)
+}
+
+func selectPoint(t *PreComputedGroupElement, pos int32, b int32) {
+	var minusT PreComputedGroupElement
+	bNegative := negative(b)
+	bAbs := b - (((-bNegative) & b) << 1)
+
+	t.Zero()
+	for i := int32(0); i < 8; i++ {
+		PreComputedGroupElementCMove(t, &base[pos][i], equal(bAbs, i+1))
+	}
+	FeCopy(&minusT.yPlusX, &t.yMinusX)
+	FeCopy(&minusT.yMinusX, &t.yPlusX)
+	FeNeg(&minusT.xy2d, &t.xy2d)
+	PreComputedGroupElementCMove(t, &minusT, bNegative)
+}
+
+// GeScalarMultBase computes h = a*B, where
+//   a = a[0]+256*a[1]+...+256^31 a[31]
+//   B is the Ed25519 base point (x,4/5) with x positive.
+//
+// Preconditions:
+//   a[31] <= 127
+func GeScalarMultBase(h *ExtendedGroupElement, a *[32]byte) {
+	var e [64]int8
+
+	for i, v := range a {
+		e[2*i] = int8(v & 15)
+		e[2*i+1] = int8((v >> 4) & 15)
+	}
+
+	// each e[i] is between 0 and 15 and e[63] is between 0 and 7.
+
+	carry := int8(0)
+	for i := 0; i < 63; i++ {
+		e[i] += carry
+		carry = (e[i] + 8) >> 4
+		e[i] -= carry << 4
+	}
+	e[63] += carry
+	// each e[i] is between -8 and 8.
+
+	h.Zero()
+	var t PreComputedGroupElement
+	var r CompletedGroupElement
+	for i := int32(1); i < 64; i += 2 {
+		selectPoint(&t, i/2, int32(e[i]))
+		geMixedAdd(&r, h, &t)
+		r.ToExtended(h)
+	}
+
+	var s ProjectiveGroupElement
+
+	h.Double(&r)
+	r.ToProjective(&s)
+	s.Double(&r)
+	r.ToProjective(&s)
+	s.Double(&r)
+	r.ToProjective(&s)
+	s.Double(&r)
+	r.ToExtended(h)
+
+	for i := int32(0); i < 64; i += 2 {
+		selectPoint(&t, i/2, int32(e[i]))
+		geMixedAdd(&r, h, &t)
+		r.ToExtended(h)
+	}
+}
+
+// The scalars are GF(2^252 + 27742317777372353535851937790883648493).
+
+// Input:
+//   a[0]+256*a[1]+...+256^31*a[31] = a
+//   b[0]+256*b[1]+...+256^31*b[31] = b
+//   c[0]+256*c[1]+...+256^31*c[31] = c
+//
+// Output:
+//   s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l
+//   where l = 2^252 + 27742317777372353535851937790883648493.
+func ScMulAdd(s, a, b, c *[32]byte) {
+	a0 := 2097151 & load3(a[:])
+	a1 := 2097151 & (load4(a[2:]) >> 5)
+	a2 := 2097151 & (load3(a[5:]) >> 2)
+	a3 := 2097151 & (load4(a[7:]) >> 7)
+	a4 := 2097151 & (load4(a[10:]) >> 4)
+	a5 := 2097151 & (load3(a[13:]) >> 1)
+	a6 := 2097151 & (load4(a[15:]) >> 6)
+	a7 := 2097151 & (load3(a[18:]) >> 3)
+	a8 := 2097151 & load3(a[21:])
+	a9 := 2097151 & (load4(a[23:]) >> 5)
+	a10 := 2097151 & (load3(a[26:]) >> 2)
+	a11 := (load4(a[28:]) >> 7)
+	b0 := 2097151 & load3(b[:])
+	b1 := 2097151 & (load4(b[2:]) >> 5)
+	b2 := 2097151 & (load3(b[5:]) >> 2)
+	b3 := 2097151 & (load4(b[7:]) >> 7)
+	b4 := 2097151 & (load4(b[10:]) >> 4)
+	b5 := 2097151 & (load3(b[13:]) >> 1)
+	b6 := 2097151 & (load4(b[15:]) >> 6)
+	b7 := 2097151 & (load3(b[18:]) >> 3)
+	b8 := 2097151 & load3(b[21:])
+	b9 := 2097151 & (load4(b[23:]) >> 5)
+	b10 := 2097151 & (load3(b[26:]) >> 2)
+	b11 := (load4(b[28:]) >> 7)
+	c0 := 2097151 & load3(c[:])
+	c1 := 2097151 & (load4(c[2:]) >> 5)
+	c2 := 2097151 & (load3(c[5:]) >> 2)
+	c3 := 2097151 & (load4(c[7:]) >> 7)
+	c4 := 2097151 & (load4(c[10:]) >> 4)
+	c5 := 2097151 & (load3(c[13:]) >> 1)
+	c6 := 2097151 & (load4(c[15:]) >> 6)
+	c7 := 2097151 & (load3(c[18:]) >> 3)
+	c8 := 2097151 & load3(c[21:])
+	c9 := 2097151 & (load4(c[23:]) >> 5)
+	c10 := 2097151 & (load3(c[26:]) >> 2)
+	c11 := (load4(c[28:]) >> 7)
+	var carry [23]int64
+
+	s0 := c0 + a0*b0
+	s1 := c1 + a0*b1 + a1*b0
+	s2 := c2 + a0*b2 + a1*b1 + a2*b0
+	s3 := c3 + a0*b3 + a1*b2 + a2*b1 + a3*b0
+	s4 := c4 + a0*b4 + a1*b3 + a2*b2 + a3*b1 + a4*b0
+	s5 := c5 + a0*b5 + a1*b4 + a2*b3 + a3*b2 + a4*b1 + a5*b0
+	s6 := c6 + a0*b6 + a1*b5 + a2*b4 + a3*b3 + a4*b2 + a5*b1 + a6*b0
+	s7 := c7 + a0*b7 + a1*b6 + a2*b5 + a3*b4 + a4*b3 + a5*b2 + a6*b1 + a7*b0
+	s8 := c8 + a0*b8 + a1*b7 + a2*b6 + a3*b5 + a4*b4 + a5*b3 + a6*b2 + a7*b1 + a8*b0
+	s9 := c9 + a0*b9 + a1*b8 + a2*b7 + a3*b6 + a4*b5 + a5*b4 + a6*b3 + a7*b2 + a8*b1 + a9*b0
+	s10 := c10 + a0*b10 + a1*b9 + a2*b8 + a3*b7 + a4*b6 + a5*b5 + a6*b4 + a7*b3 + a8*b2 + a9*b1 + a10*b0
+	s11 := c11 + a0*b11 + a1*b10 + a2*b9 + a3*b8 + a4*b7 + a5*b6 + a6*b5 + a7*b4 + a8*b3 + a9*b2 + a10*b1 + a11*b0
+	s12 := a1*b11 + a2*b10 + a3*b9 + a4*b8 + a5*b7 + a6*b6 + a7*b5 + a8*b4 + a9*b3 + a10*b2 + a11*b1
+	s13 := a2*b11 + a3*b10 + a4*b9 + a5*b8 + a6*b7 + a7*b6 + a8*b5 + a9*b4 + a10*b3 + a11*b2
+	s14 := a3*b11 + a4*b10 + a5*b9 + a6*b8 + a7*b7 + a8*b6 + a9*b5 + a10*b4 + a11*b3
+	s15 := a4*b11 + a5*b10 + a6*b9 + a7*b8 + a8*b7 + a9*b6 + a10*b5 + a11*b4
+	s16 := a5*b11 + a6*b10 + a7*b9 + a8*b8 + a9*b7 + a10*b6 + a11*b5
+	s17 := a6*b11 + a7*b10 + a8*b9 + a9*b8 + a10*b7 + a11*b6
+	s18 := a7*b11 + a8*b10 + a9*b9 + a10*b8 + a11*b7
+	s19 := a8*b11 + a9*b10 + a10*b9 + a11*b8
+	s20 := a9*b11 + a10*b10 + a11*b9
+	s21 := a10*b11 + a11*b10
+	s22 := a11 * b11
+	s23 := int64(0)
+
+	carry[0] = (s0 + (1 << 20)) >> 21
+	s1 += carry[0]
+	s0 -= carry[0] << 21
+	carry[2] = (s2 + (1 << 20)) >> 21
+	s3 += carry[2]
+	s2 -= carry[2] << 21
+	carry[4] = (s4 + (1 << 20)) >> 21
+	s5 += carry[4]
+	s4 -= carry[4] << 21
+	carry[6] = (s6 + (1 << 20)) >> 21
+	s7 += carry[6]
+	s6 -= carry[6] << 21
+	carry[8] = (s8 + (1 << 20)) >> 21
+	s9 += carry[8]
+	s8 -= carry[8] << 21
+	carry[10] = (s10 + (1 << 20)) >> 21
+	s11 += carry[10]
+	s10 -= carry[10] << 21
+	carry[12] = (s12 + (1 << 20)) >> 21
+	s13 += carry[12]
+	s12 -= carry[12] << 21
+	carry[14] = (s14 + (1 << 20)) >> 21
+	s15 += carry[14]
+	s14 -= carry[14] << 21
+	carry[16] = (s16 + (1 << 20)) >> 21
+	s17 += carry[16]
+	s16 -= carry[16] << 21
+	carry[18] = (s18 + (1 << 20)) >> 21
+	s19 += carry[18]
+	s18 -= carry[18] << 21
+	carry[20] = (s20 + (1 << 20)) >> 21
+	s21 += carry[20]
+	s20 -= carry[20] << 21
+	carry[22] = (s22 + (1 << 20)) >> 21
+	s23 += carry[22]
+	s22 -= carry[22] << 21
+
+	carry[1] = (s1 + (1 << 20)) >> 21
+	s2 += carry[1]
+	s1 -= carry[1] << 21
+	carry[3] = (s3 + (1 << 20)) >> 21
+	s4 += carry[3]
+	s3 -= carry[3] << 21
+	carry[5] = (s5 + (1 << 20)) >> 21
+	s6 += carry[5]
+	s5 -= carry[5] << 21
+	carry[7] = (s7 + (1 << 20)) >> 21
+	s8 += carry[7]
+	s7 -= carry[7] << 21
+	carry[9] = (s9 + (1 << 20)) >> 21
+	s10 += carry[9]
+	s9 -= carry[9] << 21
+	carry[11] = (s11 + (1 << 20)) >> 21
+	s12 += carry[11]
+	s11 -= carry[11] << 21
+	carry[13] = (s13 + (1 << 20)) >> 21
+	s14 += carry[13]
+	s13 -= carry[13] << 21
+	carry[15] = (s15 + (1 << 20)) >> 21
+	s16 += carry[15]
+	s15 -= carry[15] << 21
+	carry[17] = (s17 + (1 << 20)) >> 21
+	s18 += carry[17]
+	s17 -= carry[17] << 21
+	carry[19] = (s19 + (1 << 20)) >> 21
+	s20 += carry[19]
+	s19 -= carry[19] << 21
+	carry[21] = (s21 + (1 << 20)) >> 21
+	s22 += carry[21]
+	s21 -= carry[21] << 21
+
+	s11 += s23 * 666643
+	s12 += s23 * 470296
+	s13 += s23 * 654183
+	s14 -= s23 * 997805
+	s15 += s23 * 136657
+	s16 -= s23 * 683901
+	s23 = 0
+
+	s10 += s22 * 666643
+	s11 += s22 * 470296
+	s12 += s22 * 654183
+	s13 -= s22 * 997805
+	s14 += s22 * 136657
+	s15 -= s22 * 683901
+	s22 = 0
+
+	s9 += s21 * 666643
+	s10 += s21 * 470296
+	s11 += s21 * 654183
+	s12 -= s21 * 997805
+	s13 += s21 * 136657
+	s14 -= s21 * 683901
+	s21 = 0
+
+	s8 += s20 * 666643
+	s9 += s20 * 470296
+	s10 += s20 * 654183
+	s11 -= s20 * 997805
+	s12 += s20 * 136657
+	s13 -= s20 * 683901
+	s20 = 0
+
+	s7 += s19 * 666643
+	s8 += s19 * 470296
+	s9 += s19 * 654183
+	s10 -= s19 * 997805
+	s11 += s19 * 136657
+	s12 -= s19 * 683901
+	s19 = 0
+
+	s6 += s18 * 666643
+	s7 += s18 * 470296
+	s8 += s18 * 654183
+	s9 -= s18 * 997805
+	s10 += s18 * 136657
+	s11 -= s18 * 683901
+	s18 = 0
+
+	carry[6] = (s6 + (1 << 20)) >> 21
+	s7 += carry[6]
+	s6 -= carry[6] << 21
+	carry[8] = (s8 + (1 << 20)) >> 21
+	s9 += carry[8]
+	s8 -= carry[8] << 21
+	carry[10] = (s10 + (1 << 20)) >> 21
+	s11 += carry[10]
+	s10 -= carry[10] << 21
+	carry[12] = (s12 + (1 << 20)) >> 21
+	s13 += carry[12]
+	s12 -= carry[12] << 21
+	carry[14] = (s14 + (1 << 20)) >> 21
+	s15 += carry[14]
+	s14 -= carry[14] << 21
+	carry[16] = (s16 + (1 << 20)) >> 21
+	s17 += carry[16]
+	s16 -= carry[16] << 21
+
+	carry[7] = (s7 + (1 << 20)) >> 21
+	s8 += carry[7]
+	s7 -= carry[7] << 21
+	carry[9] = (s9 + (1 << 20)) >> 21
+	s10 += carry[9]
+	s9 -= carry[9] << 21
+	carry[11] = (s11 + (1 << 20)) >> 21
+	s12 += carry[11]
+	s11 -= carry[11] << 21
+	carry[13] = (s13 + (1 << 20)) >> 21
+	s14 += carry[13]
+	s13 -= carry[13] << 21
+	carry[15] = (s15 + (1 << 20)) >> 21
+	s16 += carry[15]
+	s15 -= carry[15] << 21
+
+	s5 += s17 * 666643
+	s6 += s17 * 470296
+	s7 += s17 * 654183
+	s8 -= s17 * 997805
+	s9 += s17 * 136657
+	s10 -= s17 * 683901
+	s17 = 0
+
+	s4 += s16 * 666643
+	s5 += s16 * 470296
+	s6 += s16 * 654183
+	s7 -= s16 * 997805
+	s8 += s16 * 136657
+	s9 -= s16 * 683901
+	s16 = 0
+
+	s3 += s15 * 666643
+	s4 += s15 * 470296
+	s5 += s15 * 654183
+	s6 -= s15 * 997805
+	s7 += s15 * 136657
+	s8 -= s15 * 683901
+	s15 = 0
+
+	s2 += s14 * 666643
+	s3 += s14 * 470296
+	s4 += s14 * 654183
+	s5 -= s14 * 997805
+	s6 += s14 * 136657
+	s7 -= s14 * 683901
+	s14 = 0
+
+	s1 += s13 * 666643
+	s2 += s13 * 470296
+	s3 += s13 * 654183
+	s4 -= s13 * 997805
+	s5 += s13 * 136657
+	s6 -= s13 * 683901
+	s13 = 0
+
+	s0 += s12 * 666643
+	s1 += s12 * 470296
+	s2 += s12 * 654183
+	s3 -= s12 * 997805
+	s4 += s12 * 136657
+	s5 -= s12 * 683901
+	s12 = 0
+
+	carry[0] = (s0 + (1 << 20)) >> 21
+	s1 += carry[0]
+	s0 -= carry[0] << 21
+	carry[2] = (s2 + (1 << 20)) >> 21
+	s3 += carry[2]
+	s2 -= carry[2] << 21
+	carry[4] = (s4 + (1 << 20)) >> 21
+	s5 += carry[4]
+	s4 -= carry[4] << 21
+	carry[6] = (s6 + (1 << 20)) >> 21
+	s7 += carry[6]
+	s6 -= carry[6] << 21
+	carry[8] = (s8 + (1 << 20)) >> 21
+	s9 += carry[8]
+	s8 -= carry[8] << 21
+	carry[10] = (s10 + (1 << 20)) >> 21
+	s11 += carry[10]
+	s10 -= carry[10] << 21
+
+	carry[1] = (s1 + (1 << 20)) >> 21
+	s2 += carry[1]
+	s1 -= carry[1] << 21
+	carry[3] = (s3 + (1 << 20)) >> 21
+	s4 += carry[3]
+	s3 -= carry[3] << 21
+	carry[5] = (s5 + (1 << 20)) >> 21
+	s6 += carry[5]
+	s5 -= carry[5] << 21
+	carry[7] = (s7 + (1 << 20)) >> 21
+	s8 += carry[7]
+	s7 -= carry[7] << 21
+	carry[9] = (s9 + (1 << 20)) >> 21
+	s10 += carry[9]
+	s9 -= carry[9] << 21
+	carry[11] = (s11 + (1 << 20)) >> 21
+	s12 += carry[11]
+	s11 -= carry[11] << 21
+
+	s0 += s12 * 666643
+	s1 += s12 * 470296
+	s2 += s12 * 654183
+	s3 -= s12 * 997805
+	s4 += s12 * 136657
+	s5 -= s12 * 683901
+	s12 = 0
+
+	carry[0] = s0 >> 21
+	s1 += carry[0]
+	s0 -= carry[0] << 21
+	carry[1] = s1 >> 21
+	s2 += carry[1]
+	s1 -= carry[1] << 21
+	carry[2] = s2 >> 21
+	s3 += carry[2]
+	s2 -= carry[2] << 21
+	carry[3] = s3 >> 21
+	s4 += carry[3]
+	s3 -= carry[3] << 21
+	carry[4] = s4 >> 21
+	s5 += carry[4]
+	s4 -= carry[4] << 21
+	carry[5] = s5 >> 21
+	s6 += carry[5]
+	s5 -= carry[5] << 21
+	carry[6] = s6 >> 21
+	s7 += carry[6]
+	s6 -= carry[6] << 21
+	carry[7] = s7 >> 21
+	s8 += carry[7]
+	s7 -= carry[7] << 21
+	carry[8] = s8 >> 21
+	s9 += carry[8]
+	s8 -= carry[8] << 21
+	carry[9] = s9 >> 21
+	s10 += carry[9]
+	s9 -= carry[9] << 21
+	carry[10] = s10 >> 21
+	s11 += carry[10]
+	s10 -= carry[10] << 21
+	carry[11] = s11 >> 21
+	s12 += carry[11]
+	s11 -= carry[11] << 21
+
+	s0 += s12 * 666643
+	s1 += s12 * 470296
+	s2 += s12 * 654183
+	s3 -= s12 * 997805
+	s4 += s12 * 136657
+	s5 -= s12 * 683901
+	s12 = 0
+
+	carry[0] = s0 >> 21
+	s1 += carry[0]
+	s0 -= carry[0] << 21
+	carry[1] = s1 >> 21
+	s2 += carry[1]
+	s1 -= carry[1] << 21
+	carry[2] = s2 >> 21
+	s3 += carry[2]
+	s2 -= carry[2] << 21
+	carry[3] = s3 >> 21
+	s4 += carry[3]
+	s3 -= carry[3] << 21
+	carry[4] = s4 >> 21
+	s5 += carry[4]
+	s4 -= carry[4] << 21
+	carry[5] = s5 >> 21
+	s6 += carry[5]
+	s5 -= carry[5] << 21
+	carry[6] = s6 >> 21
+	s7 += carry[6]
+	s6 -= carry[6] << 21
+	carry[7] = s7 >> 21
+	s8 += carry[7]
+	s7 -= carry[7] << 21
+	carry[8] = s8 >> 21
+	s9 += carry[8]
+	s8 -= carry[8] << 21
+	carry[9] = s9 >> 21
+	s10 += carry[9]
+	s9 -= carry[9] << 21
+	carry[10] = s10 >> 21
+	s11 += carry[10]
+	s10 -= carry[10] << 21
+
+	s[0] = byte(s0 >> 0)
+	s[1] = byte(s0 >> 8)
+	s[2] = byte((s0 >> 16) | (s1 << 5))
+	s[3] = byte(s1 >> 3)
+	s[4] = byte(s1 >> 11)
+	s[5] = byte((s1 >> 19) | (s2 << 2))
+	s[6] = byte(s2 >> 6)
+	s[7] = byte((s2 >> 14) | (s3 << 7))
+	s[8] = byte(s3 >> 1)
+	s[9] = byte(s3 >> 9)
+	s[10] = byte((s3 >> 17) | (s4 << 4))
+	s[11] = byte(s4 >> 4)
+	s[12] = byte(s4 >> 12)
+	s[13] = byte((s4 >> 20) | (s5 << 1))
+	s[14] = byte(s5 >> 7)
+	s[15] = byte((s5 >> 15) | (s6 << 6))
+	s[16] = byte(s6 >> 2)
+	s[17] = byte(s6 >> 10)
+	s[18] = byte((s6 >> 18) | (s7 << 3))
+	s[19] = byte(s7 >> 5)
+	s[20] = byte(s7 >> 13)
+	s[21] = byte(s8 >> 0)
+	s[22] = byte(s8 >> 8)
+	s[23] = byte((s8 >> 16) | (s9 << 5))
+	s[24] = byte(s9 >> 3)
+	s[25] = byte(s9 >> 11)
+	s[26] = byte((s9 >> 19) | (s10 << 2))
+	s[27] = byte(s10 >> 6)
+	s[28] = byte((s10 >> 14) | (s11 << 7))
+	s[29] = byte(s11 >> 1)
+	s[30] = byte(s11 >> 9)
+	s[31] = byte(s11 >> 17)
+}
+
+// Input:
+//   s[0]+256*s[1]+...+256^63*s[63] = s
+//
+// Output:
+//   s[0]+256*s[1]+...+256^31*s[31] = s mod l
+//   where l = 2^252 + 27742317777372353535851937790883648493.
+func ScReduce(out *[32]byte, s *[64]byte) {
+	s0 := 2097151 & load3(s[:])
+	s1 := 2097151 & (load4(s[2:]) >> 5)
+	s2 := 2097151 & (load3(s[5:]) >> 2)
+	s3 := 2097151 & (load4(s[7:]) >> 7)
+	s4 := 2097151 & (load4(s[10:]) >> 4)
+	s5 := 2097151 & (load3(s[13:]) >> 1)
+	s6 := 2097151 & (load4(s[15:]) >> 6)
+	s7 := 2097151 & (load3(s[18:]) >> 3)
+	s8 := 2097151 & load3(s[21:])
+	s9 := 2097151 & (load4(s[23:]) >> 5)
+	s10 := 2097151 & (load3(s[26:]) >> 2)
+	s11 := 2097151 & (load4(s[28:]) >> 7)
+	s12 := 2097151 & (load4(s[31:]) >> 4)
+	s13 := 2097151 & (load3(s[34:]) >> 1)
+	s14 := 2097151 & (load4(s[36:]) >> 6)
+	s15 := 2097151 & (load3(s[39:]) >> 3)
+	s16 := 2097151 & load3(s[42:])
+	s17 := 2097151 & (load4(s[44:]) >> 5)
+	s18 := 2097151 & (load3(s[47:]) >> 2)
+	s19 := 2097151 & (load4(s[49:]) >> 7)
+	s20 := 2097151 & (load4(s[52:]) >> 4)
+	s21 := 2097151 & (load3(s[55:]) >> 1)
+	s22 := 2097151 & (load4(s[57:]) >> 6)
+	s23 := (load4(s[60:]) >> 3)
+
+	s11 += s23 * 666643
+	s12 += s23 * 470296
+	s13 += s23 * 654183
+	s14 -= s23 * 997805
+	s15 += s23 * 136657
+	s16 -= s23 * 683901
+	s23 = 0
+
+	s10 += s22 * 666643
+	s11 += s22 * 470296
+	s12 += s22 * 654183
+	s13 -= s22 * 997805
+	s14 += s22 * 136657
+	s15 -= s22 * 683901
+	s22 = 0
+
+	s9 += s21 * 666643
+	s10 += s21 * 470296
+	s11 += s21 * 654183
+	s12 -= s21 * 997805
+	s13 += s21 * 136657
+	s14 -= s21 * 683901
+	s21 = 0
+
+	s8 += s20 * 666643
+	s9 += s20 * 470296
+	s10 += s20 * 654183
+	s11 -= s20 * 997805
+	s12 += s20 * 136657
+	s13 -= s20 * 683901
+	s20 = 0
+
+	s7 += s19 * 666643
+	s8 += s19 * 470296
+	s9 += s19 * 654183
+	s10 -= s19 * 997805
+	s11 += s19 * 136657
+	s12 -= s19 * 683901
+	s19 = 0
+
+	s6 += s18 * 666643
+	s7 += s18 * 470296
+	s8 += s18 * 654183
+	s9 -= s18 * 997805
+	s10 += s18 * 136657
+	s11 -= s18 * 683901
+	s18 = 0
+
+	var carry [17]int64
+
+	carry[6] = (s6 + (1 << 20)) >> 21
+	s7 += carry[6]
+	s6 -= carry[6] << 21
+	carry[8] = (s8 + (1 << 20)) >> 21
+	s9 += carry[8]
+	s8 -= carry[8] << 21
+	carry[10] = (s10 + (1 << 20)) >> 21
+	s11 += carry[10]
+	s10 -= carry[10] << 21
+	carry[12] = (s12 + (1 << 20)) >> 21
+	s13 += carry[12]
+	s12 -= carry[12] << 21
+	carry[14] = (s14 + (1 << 20)) >> 21
+	s15 += carry[14]
+	s14 -= carry[14] << 21
+	carry[16] = (s16 + (1 << 20)) >> 21
+	s17 += carry[16]
+	s16 -= carry[16] << 21
+
+	carry[7] = (s7 + (1 << 20)) >> 21
+	s8 += carry[7]
+	s7 -= carry[7] << 21
+	carry[9] = (s9 + (1 << 20)) >> 21
+	s10 += carry[9]
+	s9 -= carry[9] << 21
+	carry[11] = (s11 + (1 << 20)) >> 21
+	s12 += carry[11]
+	s11 -= carry[11] << 21
+	carry[13] = (s13 + (1 << 20)) >> 21
+	s14 += carry[13]
+	s13 -= carry[13] << 21
+	carry[15] = (s15 + (1 << 20)) >> 21
+	s16 += carry[15]
+	s15 -= carry[15] << 21
+
+	s5 += s17 * 666643
+	s6 += s17 * 470296
+	s7 += s17 * 654183
+	s8 -= s17 * 997805
+	s9 += s17 * 136657
+	s10 -= s17 * 683901
+	s17 = 0
+
+	s4 += s16 * 666643
+	s5 += s16 * 470296
+	s6 += s16 * 654183
+	s7 -= s16 * 997805
+	s8 += s16 * 136657
+	s9 -= s16 * 683901
+	s16 = 0
+
+	s3 += s15 * 666643
+	s4 += s15 * 470296
+	s5 += s15 * 654183
+	s6 -= s15 * 997805
+	s7 += s15 * 136657
+	s8 -= s15 * 683901
+	s15 = 0
+
+	s2 += s14 * 666643
+	s3 += s14 * 470296
+	s4 += s14 * 654183
+	s5 -= s14 * 997805
+	s6 += s14 * 136657
+	s7 -= s14 * 683901
+	s14 = 0
+
+	s1 += s13 * 666643
+	s2 += s13 * 470296
+	s3 += s13 * 654183
+	s4 -= s13 * 997805
+	s5 += s13 * 136657
+	s6 -= s13 * 683901
+	s13 = 0
+
+	s0 += s12 * 666643
+	s1 += s12 * 470296
+	s2 += s12 * 654183
+	s3 -= s12 * 997805
+	s4 += s12 * 136657
+	s5 -= s12 * 683901
+	s12 = 0
+
+	carry[0] = (s0 + (1 << 20)) >> 21
+	s1 += carry[0]
+	s0 -= carry[0] << 21
+	carry[2] = (s2 + (1 << 20)) >> 21
+	s3 += carry[2]
+	s2 -= carry[2] << 21
+	carry[4] = (s4 + (1 << 20)) >> 21
+	s5 += carry[4]
+	s4 -= carry[4] << 21
+	carry[6] = (s6 + (1 << 20)) >> 21
+	s7 += carry[6]
+	s6 -= carry[6] << 21
+	carry[8] = (s8 + (1 << 20)) >> 21
+	s9 += carry[8]
+	s8 -= carry[8] << 21
+	carry[10] = (s10 + (1 << 20)) >> 21
+	s11 += carry[10]
+	s10 -= carry[10] << 21
+
+	carry[1] = (s1 + (1 << 20)) >> 21
+	s2 += carry[1]
+	s1 -= carry[1] << 21
+	carry[3] = (s3 + (1 << 20)) >> 21
+	s4 += carry[3]
+	s3 -= carry[3] << 21
+	carry[5] = (s5 + (1 << 20)) >> 21
+	s6 += carry[5]
+	s5 -= carry[5] << 21
+	carry[7] = (s7 + (1 << 20)) >> 21
+	s8 += carry[7]
+	s7 -= carry[7] << 21
+	carry[9] = (s9 + (1 << 20)) >> 21
+	s10 += carry[9]
+	s9 -= carry[9] << 21
+	carry[11] = (s11 + (1 << 20)) >> 21
+	s12 += carry[11]
+	s11 -= carry[11] << 21
+
+	s0 += s12 * 666643
+	s1 += s12 * 470296
+	s2 += s12 * 654183
+	s3 -= s12 * 997805
+	s4 += s12 * 136657
+	s5 -= s12 * 683901
+	s12 = 0
+
+	carry[0] = s0 >> 21
+	s1 += carry[0]
+	s0 -= carry[0] << 21
+	carry[1] = s1 >> 21
+	s2 += carry[1]
+	s1 -= carry[1] << 21
+	carry[2] = s2 >> 21
+	s3 += carry[2]
+	s2 -= carry[2] << 21
+	carry[3] = s3 >> 21
+	s4 += carry[3]
+	s3 -= carry[3] << 21
+	carry[4] = s4 >> 21
+	s5 += carry[4]
+	s4 -= carry[4] << 21
+	carry[5] = s5 >> 21
+	s6 += carry[5]
+	s5 -= carry[5] << 21
+	carry[6] = s6 >> 21
+	s7 += carry[6]
+	s6 -= carry[6] << 21
+	carry[7] = s7 >> 21
+	s8 += carry[7]
+	s7 -= carry[7] << 21
+	carry[8] = s8 >> 21
+	s9 += carry[8]
+	s8 -= carry[8] << 21
+	carry[9] = s9 >> 21
+	s10 += carry[9]
+	s9 -= carry[9] << 21
+	carry[10] = s10 >> 21
+	s11 += carry[10]
+	s10 -= carry[10] << 21
+	carry[11] = s11 >> 21
+	s12 += carry[11]
+	s11 -= carry[11] << 21
+
+	s0 += s12 * 666643
+	s1 += s12 * 470296
+	s2 += s12 * 654183
+	s3 -= s12 * 997805
+	s4 += s12 * 136657
+	s5 -= s12 * 683901
+	s12 = 0
+
+	carry[0] = s0 >> 21
+	s1 += carry[0]
+	s0 -= carry[0] << 21
+	carry[1] = s1 >> 21
+	s2 += carry[1]
+	s1 -= carry[1] << 21
+	carry[2] = s2 >> 21
+	s3 += carry[2]
+	s2 -= carry[2] << 21
+	carry[3] = s3 >> 21
+	s4 += carry[3]
+	s3 -= carry[3] << 21
+	carry[4] = s4 >> 21
+	s5 += carry[4]
+	s4 -= carry[4] << 21
+	carry[5] = s5 >> 21
+	s6 += carry[5]
+	s5 -= carry[5] << 21
+	carry[6] = s6 >> 21
+	s7 += carry[6]
+	s6 -= carry[6] << 21
+	carry[7] = s7 >> 21
+	s8 += carry[7]
+	s7 -= carry[7] << 21
+	carry[8] = s8 >> 21
+	s9 += carry[8]
+	s8 -= carry[8] << 21
+	carry[9] = s9 >> 21
+	s10 += carry[9]
+	s9 -= carry[9] << 21
+	carry[10] = s10 >> 21
+	s11 += carry[10]
+	s10 -= carry[10] << 21
+
+	out[0] = byte(s0 >> 0)
+	out[1] = byte(s0 >> 8)
+	out[2] = byte((s0 >> 16) | (s1 << 5))
+	out[3] = byte(s1 >> 3)
+	out[4] = byte(s1 >> 11)
+	out[5] = byte((s1 >> 19) | (s2 << 2))
+	out[6] = byte(s2 >> 6)
+	out[7] = byte((s2 >> 14) | (s3 << 7))
+	out[8] = byte(s3 >> 1)
+	out[9] = byte(s3 >> 9)
+	out[10] = byte((s3 >> 17) | (s4 << 4))
+	out[11] = byte(s4 >> 4)
+	out[12] = byte(s4 >> 12)
+	out[13] = byte((s4 >> 20) | (s5 << 1))
+	out[14] = byte(s5 >> 7)
+	out[15] = byte((s5 >> 15) | (s6 << 6))
+	out[16] = byte(s6 >> 2)
+	out[17] = byte(s6 >> 10)
+	out[18] = byte((s6 >> 18) | (s7 << 3))
+	out[19] = byte(s7 >> 5)
+	out[20] = byte(s7 >> 13)
+	out[21] = byte(s8 >> 0)
+	out[22] = byte(s8 >> 8)
+	out[23] = byte((s8 >> 16) | (s9 << 5))
+	out[24] = byte(s9 >> 3)
+	out[25] = byte(s9 >> 11)
+	out[26] = byte((s9 >> 19) | (s10 << 2))
+	out[27] = byte(s10 >> 6)
+	out[28] = byte((s10 >> 14) | (s11 << 7))
+	out[29] = byte(s11 >> 1)
+	out[30] = byte(s11 >> 9)
+	out[31] = byte(s11 >> 17)
+}
+
+// order is the order of Curve25519 in little-endian form.
+var order = [4]uint64{0x5812631a5cf5d3ed, 0x14def9dea2f79cd6, 0, 0x1000000000000000}
+
+// ScMinimal returns true if the given scalar is less than the order of the
+// curve.
+func ScMinimal(scalar *[32]byte) bool {
+	for i := 3; ; i-- {
+		v := binary.LittleEndian.Uint64(scalar[i*8:])
+		if v > order[i] {
+			return false
+		} else if v < order[i] {
+			break
+		} else if i == 0 {
+			return false
+		}
+	}
+
+	return true
+}

vendor/gopkg.in/square/go-jose.v1/asymmetric.go → vendor/gopkg.in/square/go-jose.v2/asymmetric.go

@@ -28,7 +28,9 @@ import (
 	"fmt"
 	"math/big"
 
-	"gopkg.in/square/go-jose.v1/cipher"
+	"golang.org/x/crypto/ed25519"
+	"gopkg.in/square/go-jose.v2/cipher"
+	"gopkg.in/square/go-jose.v2/json"
 )
 
 // A generic RSA-based encrypter/verifier
@@ -46,6 +48,10 @@ type ecEncrypterVerifier struct {
 	publicKey *ecdsa.PublicKey
 }
 
+type edEncrypterVerifier struct {
+	publicKey ed25519.PublicKey
+}
+
 // A key generator for ECDH-ES
 type ecKeyGenerator struct {
 	size      int
@@ -58,6 +64,10 @@ type ecDecrypterSigner struct {
 	privateKey *ecdsa.PrivateKey
 }
 
+type edDecrypterSigner struct {
+	privateKey ed25519.PrivateKey
+}
+
 // newRSARecipient creates recipientKeyInfo based on the given key.
 func newRSARecipient(keyAlg KeyAlgorithm, publicKey *rsa.PublicKey) (recipientKeyInfo, error) {
 	// Verify that key management algorithm is supported by this encrypter
@@ -94,7 +104,7 @@ func newRSASigner(sigAlg SignatureAlgorithm, privateKey *rsa.PrivateKey) (recipi
 
 	return recipientSigInfo{
 		sigAlg: sigAlg,
-		publicKey: &JsonWebKey{
+		publicKey: &JSONWebKey{
 			Key: &privateKey.PublicKey,
 		},
 		signer: &rsaDecrypterSigner{
@@ -103,6 +113,25 @@ func newRSASigner(sigAlg SignatureAlgorithm, privateKey *rsa.PrivateKey) (recipi
 	}, nil
 }
 
+func newEd25519Signer(sigAlg SignatureAlgorithm, privateKey ed25519.PrivateKey) (recipientSigInfo, error) {
+	if sigAlg != EdDSA {
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	if privateKey == nil {
+		return recipientSigInfo{}, errors.New("invalid private key")
+	}
+	return recipientSigInfo{
+		sigAlg: sigAlg,
+		publicKey: &JSONWebKey{
+			Key: privateKey.Public(),
+		},
+		signer: &edDecrypterSigner{
+			privateKey: privateKey,
+		},
+	}, nil
+}
+
 // newECDHRecipient creates recipientKeyInfo based on the given key.
 func newECDHRecipient(keyAlg KeyAlgorithm, publicKey *ecdsa.PublicKey) (recipientKeyInfo, error) {
 	// Verify that key management algorithm is supported by this encrypter
@@ -139,7 +168,7 @@ func newECDSASigner(sigAlg SignatureAlgorithm, privateKey *ecdsa.PrivateKey) (re
 
 	return recipientSigInfo{
 		sigAlg: sigAlg,
-		publicKey: &JsonWebKey{
+		publicKey: &JSONWebKey{
 			Key: &privateKey.PublicKey,
 		},
 		signer: &ecDecrypterSigner{
@@ -178,7 +207,7 @@ func (ctx rsaEncrypterVerifier) encrypt(cek []byte, alg KeyAlgorithm) ([]byte, e
 
 // Decrypt the given payload and return the content encryption key.
 func (ctx rsaDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
-	return ctx.decrypt(recipient.encryptedKey, KeyAlgorithm(headers.Alg), generator)
+	return ctx.decrypt(recipient.encryptedKey, headers.getAlgorithm(), generator)
 }
 
 // Decrypt the given payload. Based on the key encryption algorithm,
@@ -366,10 +395,15 @@ func (ctx ecKeyGenerator) genKey() ([]byte, rawHeader, error) {
 
 	out := josecipher.DeriveECDHES(ctx.algID, []byte{}, []byte{}, priv, ctx.publicKey, ctx.size)
 
-	headers := rawHeader{
-		Epk: &JsonWebKey{
+	b, err := json.Marshal(&JSONWebKey{
 		Key: &priv.PublicKey,
-		},
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+
+	headers := rawHeader{
+		headerEPK: makeRawMessage(b),
 	}
 
 	return out, headers, nil
@@ -377,11 +411,15 @@ func (ctx ecKeyGenerator) genKey() ([]byte, rawHeader, error) {
 
 // Decrypt the given payload and return the content encryption key.
 func (ctx ecDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
-	if headers.Epk == nil {
+	epk, err := headers.getEPK()
+	if err != nil {
+		return nil, errors.New("square/go-jose: invalid epk header")
+	}
+	if epk == nil {
 		return nil, errors.New("square/go-jose: missing epk header")
 	}
 
-	publicKey, ok := headers.Epk.Key.(*ecdsa.PublicKey)
+	publicKey, ok := epk.Key.(*ecdsa.PublicKey)
 	if publicKey == nil || !ok {
 		return nil, errors.New("square/go-jose: invalid epk header")
 	}
@@ -390,19 +428,26 @@ func (ctx ecDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientI
 		return nil, errors.New("square/go-jose: invalid public key in epk header")
 	}
 
-	apuData := headers.Apu.bytes()
-	apvData := headers.Apv.bytes()
+	apuData, err := headers.getAPU()
+	if err != nil {
+		return nil, errors.New("square/go-jose: invalid apu header")
+	}
+	apvData, err := headers.getAPV()
+	if err != nil {
+		return nil, errors.New("square/go-jose: invalid apv header")
+	}
 
 	deriveKey := func(algID string, size int) []byte {
-		return josecipher.DeriveECDHES(algID, apuData, apvData, ctx.privateKey, publicKey, size)
+		return josecipher.DeriveECDHES(algID, apuData.bytes(), apvData.bytes(), ctx.privateKey, publicKey, size)
 	}
 
 	var keySize int
 
-	switch KeyAlgorithm(headers.Alg) {
+	algorithm := headers.getAlgorithm()
+	switch algorithm {
 	case ECDH_ES:
 		// ECDH-ES uses direct key agreement, no key unwrapping necessary.
-		return deriveKey(string(headers.Enc), generator.keySize()), nil
+		return deriveKey(string(headers.getEncryption()), generator.keySize()), nil
 	case ECDH_ES_A128KW:
 		keySize = 16
 	case ECDH_ES_A192KW:
@@ -413,7 +458,7 @@ func (ctx ecDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientI
 		return nil, ErrUnsupportedAlgorithm
 	}
 
-	key := deriveKey(headers.Alg, keySize)
+	key := deriveKey(string(algorithm), keySize)
 	block, err := aes.NewCipher(key)
 	if err != nil {
 		return nil, err
@@ -421,6 +466,32 @@ func (ctx ecDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientI
 
 	return josecipher.KeyUnwrap(block, recipient.encryptedKey)
 }
+func (ctx edDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	if alg != EdDSA {
+		return Signature{}, ErrUnsupportedAlgorithm
+	}
+
+	sig, err := ctx.privateKey.Sign(randReader, payload, crypto.Hash(0))
+	if err != nil {
+		return Signature{}, err
+	}
+
+	return Signature{
+		Signature: sig,
+		protected: &rawHeader{},
+	}, nil
+}
+
+func (ctx edEncrypterVerifier) verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error {
+	if alg != EdDSA {
+		return ErrUnsupportedAlgorithm
+	}
+	ok := ed25519.Verify(ctx.publicKey, payload, signature)
+	if !ok {
+		return errors.New("square/go-jose: ed25519 signature failed to verify")
+	}
+	return nil
+}
 
 // Sign the given payload
 func (ctx ecDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
@@ -457,7 +528,7 @@ func (ctx ecDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm)
 
 	keyBytes := curveBits / 8
 	if curveBits%8 > 0 {
-		keyBytes += 1
+		keyBytes++
 	}
 
 	// We serialize the outpus (r and s) into big-endian byte arrays and pad

vendor/gopkg.in/square/go-jose.v1/cipher/ecdh_es.go → vendor/gopkg.in/square/go-jose.v2/cipher/ecdh_es.go

@@ -28,7 +28,7 @@ import (
 // size may be at most 1<<16 bytes (64 KiB).
 func DeriveECDHES(alg string, apuData, apvData []byte, priv *ecdsa.PrivateKey, pub *ecdsa.PublicKey, size int) []byte {
 	if size > 1<<16 {
-		panic("ECDH-ES output size too large, must be less than 1<<16")
+		panic("ECDH-ES output size too large, must be less than or equal to 1<<16")
 	}
 
 	// algId, partyUInfo, partyVInfo inputs must be prefixed with the length

vendor/gopkg.in/square/go-jose.v1/crypter.go → vendor/gopkg.in/square/go-jose.v2/crypter.go

@@ -22,21 +22,15 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
+
+	"gopkg.in/square/go-jose.v2/json"
 )
 
 // Encrypter represents an encrypter which produces an encrypted JWE object.
 type Encrypter interface {
-	Encrypt(plaintext []byte) (*JsonWebEncryption, error)
-	EncryptWithAuthData(plaintext []byte, aad []byte) (*JsonWebEncryption, error)
-	SetCompression(alg CompressionAlgorithm)
-}
-
-// MultiEncrypter represents an encrypter which supports multiple recipients.
-type MultiEncrypter interface {
-	Encrypt(plaintext []byte) (*JsonWebEncryption, error)
-	EncryptWithAuthData(plaintext []byte, aad []byte) (*JsonWebEncryption, error)
-	SetCompression(alg CompressionAlgorithm)
-	AddRecipient(alg KeyAlgorithm, encryptionKey interface{}) error
+	Encrypt(plaintext []byte) (*JSONWebEncryption, error)
+	EncryptWithAuthData(plaintext []byte, aad []byte) (*JSONWebEncryption, error)
+	Options() EncrypterOptions
 }
 
 // A generic content cipher
@@ -69,6 +63,7 @@ type genericEncrypter struct {
 	cipher         contentCipher
 	recipients     []recipientKeyInfo
 	keyGenerator   keyGenerator
+	extraHeaders   map[HeaderKey]interface{}
 }
 
 type recipientKeyInfo struct {
@@ -77,19 +72,55 @@ type recipientKeyInfo struct {
 	keyEncrypter keyEncrypter
 }
 
-// SetCompression sets a compression algorithm to be applied before encryption.
-func (ctx *genericEncrypter) SetCompression(compressionAlg CompressionAlgorithm) {
-	ctx.compressionAlg = compressionAlg
+// EncrypterOptions represents options that can be set on new encrypters.
+type EncrypterOptions struct {
+	Compression CompressionAlgorithm
+
+	// Optional map of additional keys to be inserted into the protected header
+	// of a JWS object. Some specifications which make use of JWS like to insert
+	// additional values here. All values must be JSON-serializable.
+	ExtraHeaders map[HeaderKey]interface{}
+}
+
+// WithHeader adds an arbitrary value to the ExtraHeaders map, initializing it
+// if necessary. It returns itself and so can be used in a fluent style.
+func (eo *EncrypterOptions) WithHeader(k HeaderKey, v interface{}) *EncrypterOptions {
+	if eo.ExtraHeaders == nil {
+		eo.ExtraHeaders = map[HeaderKey]interface{}{}
+	}
+	eo.ExtraHeaders[k] = v
+	return eo
+}
+
+// WithContentType adds a content type ("cty") header and returns the updated
+// EncrypterOptions.
+func (eo *EncrypterOptions) WithContentType(contentType ContentType) *EncrypterOptions {
+	return eo.WithHeader(HeaderContentType, contentType)
+}
+
+// WithType adds a type ("typ") header and returns the updated EncrypterOptions.
+func (eo *EncrypterOptions) WithType(typ ContentType) *EncrypterOptions {
+	return eo.WithHeader(HeaderType, typ)
+}
+
+// Recipient represents an algorithm/key to encrypt messages to.
+type Recipient struct {
+	Algorithm KeyAlgorithm
+	Key       interface{}
+	KeyID     string
 }
 
 // NewEncrypter creates an appropriate encrypter based on the key type
-func NewEncrypter(alg KeyAlgorithm, enc ContentEncryption, encryptionKey interface{}) (Encrypter, error) {
+func NewEncrypter(enc ContentEncryption, rcpt Recipient, opts *EncrypterOptions) (Encrypter, error) {
 	encrypter := &genericEncrypter{
 		contentAlg: enc,
-		compressionAlg: NONE,
 		recipients: []recipientKeyInfo{},
 		cipher:     getContentCipher(enc),
 	}
+	if opts != nil {
+		encrypter.compressionAlg = opts.Compression
+		encrypter.extraHeaders = opts.ExtraHeaders
+	}
 
 	if encrypter.cipher == nil {
 		return nil, ErrUnsupportedAlgorithm
@@ -97,15 +128,16 @@ func NewEncrypter(alg KeyAlgorithm, enc ContentEncryption, encryptionKey interfa
 
 	var keyID string
 	var rawKey interface{}
-	switch encryptionKey := encryptionKey.(type) {
-	case *JsonWebKey:
-		keyID = encryptionKey.KeyID
-		rawKey = encryptionKey.Key
+	switch encryptionKey := rcpt.Key.(type) {
+	case JSONWebKey:
+		keyID, rawKey = encryptionKey.KeyID, encryptionKey.Key
+	case *JSONWebKey:
+		keyID, rawKey = encryptionKey.KeyID, encryptionKey.Key
 	default:
 		rawKey = encryptionKey
 	}
 
-	switch alg {
+	switch rcpt.Algorithm {
 	case DIRECT:
 		// Direct encryption mode must be treated differently
 		if reflect.TypeOf(rawKey) != reflect.TypeOf([]byte{}) {
@@ -114,11 +146,12 @@ func NewEncrypter(alg KeyAlgorithm, enc ContentEncryption, encryptionKey interfa
 		encrypter.keyGenerator = staticKeyGenerator{
 			key: rawKey.([]byte),
 		}
-		recipient, _ := newSymmetricRecipient(alg, rawKey.([]byte))
-		if keyID != "" {
-			recipient.keyID = keyID
+		recipientInfo, _ := newSymmetricRecipient(rcpt.Algorithm, rawKey.([]byte))
+		recipientInfo.keyID = keyID
+		if rcpt.KeyID != "" {
+			recipientInfo.keyID = rcpt.KeyID
 		}
-		encrypter.recipients = []recipientKeyInfo{recipient}
+		encrypter.recipients = []recipientKeyInfo{recipientInfo}
 		return encrypter, nil
 	case ECDH_ES:
 		// ECDH-ES (w/o key wrapping) is similar to DIRECT mode
@@ -131,33 +164,36 @@ func NewEncrypter(alg KeyAlgorithm, enc ContentEncryption, encryptionKey interfa
 			algID:     string(enc),
 			publicKey: rawKey.(*ecdsa.PublicKey),
 		}
-		recipient, _ := newECDHRecipient(alg, rawKey.(*ecdsa.PublicKey))
-		if keyID != "" {
-			recipient.keyID = keyID
+		recipientInfo, _ := newECDHRecipient(rcpt.Algorithm, rawKey.(*ecdsa.PublicKey))
+		recipientInfo.keyID = keyID
+		if rcpt.KeyID != "" {
+			recipientInfo.keyID = rcpt.KeyID
 		}
-		encrypter.recipients = []recipientKeyInfo{recipient}
+		encrypter.recipients = []recipientKeyInfo{recipientInfo}
 		return encrypter, nil
 	default:
 		// Can just add a standard recipient
 		encrypter.keyGenerator = randomKeyGenerator{
 			size: encrypter.cipher.keySize(),
 		}
-		err := encrypter.AddRecipient(alg, encryptionKey)
+		err := encrypter.addRecipient(rcpt)
 		return encrypter, err
 	}
 }
 
 // NewMultiEncrypter creates a multi-encrypter based on the given parameters
-func NewMultiEncrypter(enc ContentEncryption) (MultiEncrypter, error) {
+func NewMultiEncrypter(enc ContentEncryption, rcpts []Recipient, opts *EncrypterOptions) (Encrypter, error) {
 	cipher := getContentCipher(enc)
 
 	if cipher == nil {
 		return nil, ErrUnsupportedAlgorithm
 	}
+	if rcpts == nil || len(rcpts) == 0 {
+		return nil, fmt.Errorf("square/go-jose: recipients is nil or empty")
+	}
 
 	encrypter := &genericEncrypter{
 		contentAlg: enc,
-		compressionAlg: NONE,
 		recipients: []recipientKeyInfo{},
 		cipher:     cipher,
 		keyGenerator: randomKeyGenerator{
@@ -165,21 +201,35 @@ func NewMultiEncrypter(enc ContentEncryption) (MultiEncrypter, error) {
 		},
 	}
 
+	if opts != nil {
+		encrypter.compressionAlg = opts.Compression
+	}
+
+	for _, recipient := range rcpts {
+		err := encrypter.addRecipient(recipient)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	return encrypter, nil
 }
 
-func (ctx *genericEncrypter) AddRecipient(alg KeyAlgorithm, encryptionKey interface{}) (err error) {
-	var recipient recipientKeyInfo
+func (ctx *genericEncrypter) addRecipient(recipient Recipient) (err error) {
+	var recipientInfo recipientKeyInfo
 
-	switch alg {
+	switch recipient.Algorithm {
 	case DIRECT, ECDH_ES:
-		return fmt.Errorf("square/go-jose: key algorithm '%s' not supported in multi-recipient mode", alg)
+		return fmt.Errorf("square/go-jose: key algorithm '%s' not supported in multi-recipient mode", recipient.Algorithm)
 	}
 
-	recipient, err = makeJWERecipient(alg, encryptionKey)
+	recipientInfo, err = makeJWERecipient(recipient.Algorithm, recipient.Key)
+	if recipient.KeyID != "" {
+		recipientInfo.keyID = recipient.KeyID
+	}
 
 	if err == nil {
-		ctx.recipients = append(ctx.recipients, recipient)
+		ctx.recipients = append(ctx.recipients, recipientInfo)
 	}
 	return err
 }
@@ -192,11 +242,9 @@ func makeJWERecipient(alg KeyAlgorithm, encryptionKey interface{}) (recipientKey
 		return newECDHRecipient(alg, encryptionKey)
 	case []byte:
 		return newSymmetricRecipient(alg, encryptionKey)
-	case *JsonWebKey:
+	case *JSONWebKey:
 		recipient, err := makeJWERecipient(alg, encryptionKey.Key)
-		if err == nil && encryptionKey.KeyID != "" {
 		recipient.keyID = encryptionKey.KeyID
-		}
 		return recipient, err
 	default:
 		return recipientKeyInfo{}, ErrUnsupportedKeyType
@@ -218,7 +266,9 @@ func newDecrypter(decryptionKey interface{}) (keyDecrypter, error) {
 		return &symmetricKeyCipher{
 			key: decryptionKey,
 		}, nil
-	case *JsonWebKey:
+	case JSONWebKey:
+		return newDecrypter(decryptionKey.Key)
+	case *JSONWebKey:
 		return newDecrypter(decryptionKey.Key)
 	default:
 		return nil, ErrUnsupportedKeyType
@@ -226,18 +276,21 @@ func newDecrypter(decryptionKey interface{}) (keyDecrypter, error) {
 }
 
 // Implementation of encrypt method producing a JWE object.
-func (ctx *genericEncrypter) Encrypt(plaintext []byte) (*JsonWebEncryption, error) {
+func (ctx *genericEncrypter) Encrypt(plaintext []byte) (*JSONWebEncryption, error) {
 	return ctx.EncryptWithAuthData(plaintext, nil)
 }
 
 // Implementation of encrypt method producing a JWE object.
-func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JsonWebEncryption, error) {
-	obj := &JsonWebEncryption{}
+func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JSONWebEncryption, error) {
+	obj := &JSONWebEncryption{}
 	obj.aad = aad
 
-	obj.protected = &rawHeader{
-		Enc: ctx.contentAlg,
+	obj.protected = &rawHeader{}
+	err := obj.protected.set(headerEncryption, ctx.contentAlg)
+	if err != nil {
+		return nil, err
 	}
+
 	obj.recipients = make([]recipientInfo, len(ctx.recipients))
 
 	if len(ctx.recipients) == 0 {
@@ -257,9 +310,16 @@ func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JsonWe
 			return nil, err
 		}
 
-		recipient.header.Alg = string(info.keyAlg)
+		err = recipient.header.set(headerAlgorithm, info.keyAlg)
+		if err != nil {
+			return nil, err
+		}
+
 		if info.keyID != "" {
-			recipient.header.Kid = info.keyID
+			err = recipient.header.set(headerKeyID, info.keyID)
+			if err != nil {
+				return nil, err
+			}
 		}
 		obj.recipients[i] = recipient
 	}
@@ -277,7 +337,18 @@ func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JsonWe
 			return nil, err
 		}
 
-		obj.protected.Zip = ctx.compressionAlg
+		err = obj.protected.set(headerCompression, ctx.compressionAlg)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	for k, v := range ctx.extraHeaders {
+		b, err := json.Marshal(v)
+		if err != nil {
+			return nil, err
+		}
+		(*obj.protected)[k] = makeRawMessage(b)
 	}
 
 	authData := obj.computeAuthData()
@@ -293,17 +364,29 @@ func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JsonWe
 	return obj, nil
 }
 
+func (ctx *genericEncrypter) Options() EncrypterOptions {
+	return EncrypterOptions{
+		Compression:  ctx.compressionAlg,
+		ExtraHeaders: ctx.extraHeaders,
+	}
+}
+
 // Decrypt and validate the object and return the plaintext. Note that this
 // function does not support multi-recipient, if you desire multi-recipient
 // decryption use DecryptMulti instead.
-func (obj JsonWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error) {
+func (obj JSONWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error) {
 	headers := obj.mergedHeaders(nil)
 
 	if len(obj.recipients) > 1 {
 		return nil, errors.New("square/go-jose: too many recipients in payload; expecting only one")
 	}
 
-	if len(headers.Crit) > 0 {
+	critical, err := headers.getCritical()
+	if err != nil {
+		return nil, fmt.Errorf("square/go-jose: invalid crit header")
+	}
+
+	if len(critical) > 0 {
 		return nil, fmt.Errorf("square/go-jose: unsupported crit header")
 	}
 
@@ -312,9 +395,9 @@ func (obj JsonWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error)
 		return nil, err
 	}
 
-	cipher := getContentCipher(headers.Enc)
+	cipher := getContentCipher(headers.getEncryption())
 	if cipher == nil {
-		return nil, fmt.Errorf("square/go-jose: unsupported enc value '%s'", string(headers.Enc))
+		return nil, fmt.Errorf("square/go-jose: unsupported enc value '%s'", string(headers.getEncryption()))
 	}
 
 	generator := randomKeyGenerator{
@@ -344,8 +427,8 @@ func (obj JsonWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error)
 	}
 
 	// The "zip" header parameter may only be present in the protected header.
-	if obj.protected.Zip != "" {
-		plaintext, err = decompress(obj.protected.Zip, plaintext)
+	if comp := obj.protected.getCompression(); comp != "" {
+		plaintext, err = decompress(comp, plaintext)
 	}
 
 	return plaintext, err
@@ -355,21 +438,27 @@ func (obj JsonWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error)
 // with support for multiple recipients. It returns the index of the recipient
 // for which the decryption was successful, the merged headers for that recipient,
 // and the plaintext.
-func (obj JsonWebEncryption) DecryptMulti(decryptionKey interface{}) (int, JoseHeader, []byte, error) {
+func (obj JSONWebEncryption) DecryptMulti(decryptionKey interface{}) (int, Header, []byte, error) {
 	globalHeaders := obj.mergedHeaders(nil)
 
-	if len(globalHeaders.Crit) > 0 {
-		return -1, JoseHeader{}, nil, fmt.Errorf("square/go-jose: unsupported crit header")
+	critical, err := globalHeaders.getCritical()
+	if err != nil {
+		return -1, Header{}, nil, fmt.Errorf("square/go-jose: invalid crit header")
+	}
+
+	if len(critical) > 0 {
+		return -1, Header{}, nil, fmt.Errorf("square/go-jose: unsupported crit header")
 	}
 
 	decrypter, err := newDecrypter(decryptionKey)
 	if err != nil {
-		return -1, JoseHeader{}, nil, err
+		return -1, Header{}, nil, err
 	}
 
-	cipher := getContentCipher(globalHeaders.Enc)
+	encryption := globalHeaders.getEncryption()
+	cipher := getContentCipher(encryption)
 	if cipher == nil {
-		return -1, JoseHeader{}, nil, fmt.Errorf("square/go-jose: unsupported enc value '%s'", string(globalHeaders.Enc))
+		return -1, Header{}, nil, fmt.Errorf("square/go-jose: unsupported enc value '%s'", string(encryption))
 	}
 
 	generator := randomKeyGenerator{
@@ -404,13 +493,18 @@ func (obj JsonWebEncryption) DecryptMulti(decryptionKey interface{}) (int, JoseH
 	}
 
 	if plaintext == nil || err != nil {
-		return -1, JoseHeader{}, nil, ErrCryptoFailure
+		return -1, Header{}, nil, ErrCryptoFailure
 	}
 
 	// The "zip" header parameter may only be present in the protected header.
-	if obj.protected.Zip != "" {
-		plaintext, err = decompress(obj.protected.Zip, plaintext)
+	if comp := obj.protected.getCompression(); comp != "" {
+		plaintext, err = decompress(comp, plaintext)
+	}
+
+	sanitized, err := headers.sanitized()
+	if err != nil {
+		return -1, Header{}, nil, fmt.Errorf("square/go-jose: failed to sanitize header: %v", err)
 	}
 
-	return index, headers.sanitized(), plaintext, err
+	return index, sanitized, plaintext, err
 }

vendor/gopkg.in/square/go-jose.v1/doc.go → vendor/gopkg.in/square/go-jose.v2/doc.go

@@ -17,10 +17,11 @@
 /*
 
 Package jose aims to provide an implementation of the Javascript Object Signing
-and Encryption set of standards. For the moment, it mainly focuses on
-encryption and signing based on the JSON Web Encryption and JSON Web Signature
-standards.  The library supports both the compact and full serialization
-formats, and has optional support for multiple recipients.
+and Encryption set of standards. It implements encryption and signing based on
+the JSON Web Encryption and JSON Web Signature standards, with optional JSON
+Web Token support available in a sub-package. The library supports both the
+compact and full serialization formats, and has optional support for multiple
+recipients.
 
 */
-package jose // import "gopkg.in/square/go-jose.v1"
+package jose

vendor/gopkg.in/square/go-jose.v1/encoding.go → vendor/gopkg.in/square/go-jose.v2/encoding.go

@@ -21,29 +21,14 @@ import (
 	"compress/flate"
 	"encoding/base64"
 	"encoding/binary"
+	"encoding/json"
 	"io"
 	"math/big"
 	"regexp"
-	"strings"
-
-	"gopkg.in/square/go-jose.v1/json"
 )
 
 var stripWhitespaceRegex = regexp.MustCompile("\\s")
 
-// Url-safe base64 encode that strips padding
-func base64URLEncode(data []byte) string {
-	var result = base64.URLEncoding.EncodeToString(data)
-	return strings.TrimRight(result, "=")
-}
-
-// Url-safe base64 decoder that adds padding
-func base64URLDecode(data string) ([]byte, error) {
-	var missing = (4 - len(data)%4) % 4
-	data += strings.Repeat("=", missing)
-	return base64.URLEncoding.DecodeString(data)
-}
-
 // Helper function to serialize known-good objects.
 // Precondition: value is not a nil pointer.
 func mustSerializeJSON(value interface{}) []byte {
@@ -162,7 +147,7 @@ func (b *byteBuffer) UnmarshalJSON(data []byte) error {
 		return nil
 	}
 
-	decoded, err := base64URLDecode(encoded)
+	decoded, err := base64.RawURLEncoding.DecodeString(encoded)
 	if err != nil {
 		return err
 	}
@@ -173,7 +158,7 @@ func (b *byteBuffer) UnmarshalJSON(data []byte) error {
 }
 
 func (b *byteBuffer) base64() string {
-	return base64URLEncode(b.data)
+	return base64.RawURLEncoding.EncodeToString(b.data)
 }
 
 func (b *byteBuffer) bytes() []byte {

vendor/gopkg.in/square/go-jose.v1/jose-util/main.go → vendor/gopkg.in/square/go-jose.v2/jose-util/main.go

@@ -22,7 +22,7 @@ import (
 	"os"
 
 	"gopkg.in/alecthomas/kingpin.v2"
-	"gopkg.in/square/go-jose.v1"
+	"gopkg.in/square/go-jose.v2"
 )
 
 var (
@@ -50,7 +50,7 @@ var (
 )
 
 func main() {
-	app.Version("v1")
+	app.Version("v2")
 
 	command := kingpin.MustParse(app.Parse(os.Args[1:]))
 
@@ -63,13 +63,13 @@ func main() {
 
 	switch command {
 	case "encrypt":
-		pub, err := jose.LoadPublicKey(keyBytes)
+		pub, err := LoadPublicKey(keyBytes)
 		exitOnError(err, "unable to read public key")
 
 		alg := jose.KeyAlgorithm(*algFlag)
 		enc := jose.ContentEncryption(*encFlag)
 
-		crypter, err := jose.NewEncrypter(alg, enc, pub)
+		crypter, err := jose.NewEncrypter(enc, jose.Recipient{Algorithm: alg, Key: pub}, nil)
 		exitOnError(err, "unable to instantiate encrypter")
 
 		obj, err := crypter.Encrypt(readInput(*inFile))
@@ -85,7 +85,7 @@ func main() {
 
 		writeOutput(*outFile, []byte(msg))
 	case "decrypt":
-		priv, err := jose.LoadPrivateKey(keyBytes)
+		priv, err := LoadPrivateKey(keyBytes)
 		exitOnError(err, "unable to read private key")
 
 		obj, err := jose.ParseEncrypted(string(readInput(*inFile)))
@@ -96,11 +96,11 @@ func main() {
 
 		writeOutput(*outFile, plaintext)
 	case "sign":
-		signingKey, err := jose.LoadPrivateKey(keyBytes)
+		signingKey, err := LoadPrivateKey(keyBytes)
 		exitOnError(err, "unable to read private key")
 
 		alg := jose.SignatureAlgorithm(*sigAlgFlag)
-		signer, err := jose.NewSigner(alg, signingKey)
+		signer, err := jose.NewSigner(jose.SigningKey{Algorithm: alg, Key: signingKey}, nil)
 		exitOnError(err, "unable to make signer")
 
 		obj, err := signer.Sign(readInput(*inFile))
@@ -116,8 +116,8 @@ func main() {
 
 		writeOutput(*outFile, []byte(msg))
 	case "verify":
-		verificationKey, err := jose.LoadPublicKey(keyBytes)
-		exitOnError(err, "unable to read private key")
+		verificationKey, err := LoadPublicKey(keyBytes)
+		exitOnError(err, "unable to read public key")
 
 		obj, err := jose.ParseSigned(string(readInput(*inFile)))
 		exitOnError(err, "unable to parse message")
@@ -133,13 +133,13 @@ func main() {
 		var err error
 		switch *formatFlag {
 		case "", "JWE":
-			var jwe *jose.JsonWebEncryption
+			var jwe *jose.JSONWebEncryption
 			jwe, err = jose.ParseEncrypted(input)
 			if err == nil {
 				serialized = jwe.FullSerialize()
 			}
 		case "JWS":
-			var jws *jose.JsonWebSignature
+			var jws *jose.JSONWebSignature
 			jws, err = jose.ParseSigned(input)
 			if err == nil {
 				serialized = jws.FullSerialize()

vendor/gopkg.in/square/go-jose.v1/utils.go → vendor/gopkg.in/square/go-jose.v2/jose-util/utils.go

@@ -14,15 +14,32 @@
  * limitations under the License.
  */
 
-package jose
+package main
 
 import (
 	"crypto/x509"
 	"encoding/pem"
+	"errors"
 	"fmt"
+	"gopkg.in/square/go-jose.v2"
 )
 
-// LoadPublicKey loads a public key from PEM/DER-encoded data.
+func LoadJSONWebKey(json []byte, pub bool) (*jose.JSONWebKey, error) {
+	var jwk jose.JSONWebKey
+	err := jwk.UnmarshalJSON(json)
+	if err != nil {
+		return nil, err
+	}
+	if !jwk.Valid() {
+		return nil, errors.New("invalid JWK key")
+	}
+	if jwk.IsPublic() != pub {
+		return nil, errors.New("priv/pub JWK key mismatch")
+	}
+	return &jwk, nil
+}
+
+// LoadPublicKey loads a public key from PEM/DER/JWK-encoded data.
 func LoadPublicKey(data []byte) (interface{}, error) {
 	input := data
 
@@ -42,10 +59,15 @@ func LoadPublicKey(data []byte) (interface{}, error) {
 		return cert.PublicKey, nil
 	}
 
-	return nil, fmt.Errorf("square/go-jose: parse error, got '%s' and '%s'", err0, err1)
+	jwk, err2 := LoadJSONWebKey(data, true)
+	if err2 == nil {
+		return jwk, nil
+	}
+
+	return nil, fmt.Errorf("square/go-jose: parse error, got '%s', '%s' and '%s'", err0, err1, err2)
 }
 
-// LoadPrivateKey loads a private key from PEM/DER-encoded data.
+// LoadPrivateKey loads a private key from PEM/DER/JWK-encoded data.
 func LoadPrivateKey(data []byte) (interface{}, error) {
 	input := data
 
@@ -70,5 +92,10 @@ func LoadPrivateKey(data []byte) (interface{}, error) {
 		return priv, nil
 	}
 
-	return nil, fmt.Errorf("square/go-jose: parse error, got '%s', '%s' and '%s'", err0, err1, err2)
+	jwk, err3 := LoadJSONWebKey(input, false)
+	if err3 == nil {
+		return jwk, nil
+	}
+
+	return nil, fmt.Errorf("square/go-jose: parse error, got '%s', '%s', '%s' and '%s'", err0, err1, err2, err3)
 }

vendor/gopkg.in/square/go-jose.v1/jwe.go → vendor/gopkg.in/square/go-jose.v2/jwe.go

@@ -17,14 +17,14 @@
 package jose
 
 import (
+	"encoding/base64"
+	"encoding/json"
 	"fmt"
 	"strings"
-
-	"gopkg.in/square/go-jose.v1/json"
 )
 
-// rawJsonWebEncryption represents a raw JWE JSON object. Used for parsing/serializing.
-type rawJsonWebEncryption struct {
+// rawJSONWebEncryption represents a raw JWE JSON object. Used for parsing/serializing.
+type rawJSONWebEncryption struct {
 	Protected    *byteBuffer        `json:"protected,omitempty"`
 	Unprotected  *rawHeader         `json:"unprotected,omitempty"`
 	Header       *rawHeader         `json:"header,omitempty"`
@@ -42,13 +42,13 @@ type rawRecipientInfo struct {
 	EncryptedKey string     `json:"encrypted_key,omitempty"`
 }
 
-// JsonWebEncryption represents an encrypted JWE object after parsing.
-type JsonWebEncryption struct {
-	Header                   JoseHeader
+// JSONWebEncryption represents an encrypted JWE object after parsing.
+type JSONWebEncryption struct {
+	Header                   Header
 	protected, unprotected   *rawHeader
 	recipients               []recipientInfo
 	aad, iv, ciphertext, tag []byte
-	original                 *rawJsonWebEncryption
+	original                 *rawJSONWebEncryption
 }
 
 // recipientInfo represents a raw JWE Per-Recipient header JSON object after parsing.
@@ -58,7 +58,7 @@ type recipientInfo struct {
 }
 
 // GetAuthData retrieves the (optional) authenticated data attached to the object.
-func (obj JsonWebEncryption) GetAuthData() []byte {
+func (obj JSONWebEncryption) GetAuthData() []byte {
 	if obj.aad != nil {
 		out := make([]byte, len(obj.aad))
 		copy(out, obj.aad)
@@ -69,7 +69,7 @@ func (obj JsonWebEncryption) GetAuthData() []byte {
 }
 
 // Get the merged header values
-func (obj JsonWebEncryption) mergedHeaders(recipient *recipientInfo) rawHeader {
+func (obj JSONWebEncryption) mergedHeaders(recipient *recipientInfo) rawHeader {
 	out := rawHeader{}
 	out.merge(obj.protected)
 	out.merge(obj.unprotected)
@@ -82,26 +82,26 @@ func (obj JsonWebEncryption) mergedHeaders(recipient *recipientInfo) rawHeader {
 }
 
 // Get the additional authenticated data from a JWE object.
-func (obj JsonWebEncryption) computeAuthData() []byte {
+func (obj JSONWebEncryption) computeAuthData() []byte {
 	var protected string
 
 	if obj.original != nil {
 		protected = obj.original.Protected.base64()
 	} else {
-		protected = base64URLEncode(mustSerializeJSON((obj.protected)))
+		protected = base64.RawURLEncoding.EncodeToString(mustSerializeJSON((obj.protected)))
 	}
 
 	output := []byte(protected)
 	if obj.aad != nil {
 		output = append(output, '.')
-		output = append(output, []byte(base64URLEncode(obj.aad))...)
+		output = append(output, []byte(base64.RawURLEncoding.EncodeToString(obj.aad))...)
 	}
 
 	return output
 }
 
 // ParseEncrypted parses an encrypted message in compact or full serialization format.
-func ParseEncrypted(input string) (*JsonWebEncryption, error) {
+func ParseEncrypted(input string) (*JSONWebEncryption, error) {
 	input = stripWhitespace(input)
 	if strings.HasPrefix(input, "{") {
 		return parseEncryptedFull(input)
@@ -111,8 +111,8 @@ func ParseEncrypted(input string) (*JsonWebEncryption, error) {
 }
 
 // parseEncryptedFull parses a message in compact format.
-func parseEncryptedFull(input string) (*JsonWebEncryption, error) {
-	var parsed rawJsonWebEncryption
+func parseEncryptedFull(input string) (*JSONWebEncryption, error) {
+	var parsed rawJSONWebEncryption
 	err := json.Unmarshal([]byte(input), &parsed)
 	if err != nil {
 		return nil, err
@@ -122,17 +122,23 @@ func parseEncryptedFull(input string) (*JsonWebEncryption, error) {
 }
 
 // sanitized produces a cleaned-up JWE object from the raw JSON.
-func (parsed *rawJsonWebEncryption) sanitized() (*JsonWebEncryption, error) {
-	obj := &JsonWebEncryption{
+func (parsed *rawJSONWebEncryption) sanitized() (*JSONWebEncryption, error) {
+	obj := &JSONWebEncryption{
 		original:    parsed,
 		unprotected: parsed.Unprotected,
 	}
 
 	// Check that there is not a nonce in the unprotected headers
-	if (parsed.Unprotected != nil && parsed.Unprotected.Nonce != "") ||
-		(parsed.Header != nil && parsed.Header.Nonce != "") {
+	if parsed.Unprotected != nil {
+		if nonce := parsed.Unprotected.getNonce(); nonce != "" {
+			return nil, ErrUnprotectedNonce
+		}
+	}
+	if parsed.Header != nil {
+		if nonce := parsed.Header.getNonce(); nonce != "" {
 			return nil, ErrUnprotectedNonce
 		}
+	}
 
 	if parsed.Protected != nil && len(parsed.Protected.bytes()) > 0 {
 		err := json.Unmarshal(parsed.Protected.bytes(), &obj.protected)
@@ -143,11 +149,16 @@ func (parsed *rawJsonWebEncryption) sanitized() (*JsonWebEncryption, error) {
 
 	// Note: this must be called _after_ we parse the protected header,
 	// otherwise fields from the protected header will not get picked up.
-	obj.Header = obj.mergedHeaders(nil).sanitized()
+	var err error
+	mergedHeaders := obj.mergedHeaders(nil)
+	obj.Header, err = mergedHeaders.sanitized()
+	if err != nil {
+		return nil, fmt.Errorf("square/go-jose: cannot sanitize merged headers: %v (%v)", err, mergedHeaders)
+	}
 
 	if len(parsed.Recipients) == 0 {
 		obj.recipients = []recipientInfo{
-			recipientInfo{
+			{
 				header:       parsed.Header,
 				encryptedKey: parsed.EncryptedKey.bytes(),
 			},
@@ -155,13 +166,13 @@ func (parsed *rawJsonWebEncryption) sanitized() (*JsonWebEncryption, error) {
 	} else {
 		obj.recipients = make([]recipientInfo, len(parsed.Recipients))
 		for r := range parsed.Recipients {
-			encryptedKey, err := base64URLDecode(parsed.Recipients[r].EncryptedKey)
+			encryptedKey, err := base64.RawURLEncoding.DecodeString(parsed.Recipients[r].EncryptedKey)
 			if err != nil {
 				return nil, err
 			}
 
 			// Check that there is not a nonce in the unprotected header
-			if parsed.Recipients[r].Header != nil && parsed.Recipients[r].Header.Nonce != "" {
+			if parsed.Recipients[r].Header != nil && parsed.Recipients[r].Header.getNonce() != "" {
 				return nil, ErrUnprotectedNonce
 			}
 
@@ -172,7 +183,7 @@ func (parsed *rawJsonWebEncryption) sanitized() (*JsonWebEncryption, error) {
 
 	for _, recipient := range obj.recipients {
 		headers := obj.mergedHeaders(&recipient)
-		if headers.Alg == "" || headers.Enc == "" {
+		if headers.getAlgorithm() == "" || headers.getEncryption() == "" {
 			return nil, fmt.Errorf("square/go-jose: message is missing alg/enc headers")
 		}
 	}
@@ -186,38 +197,38 @@ func (parsed *rawJsonWebEncryption) sanitized() (*JsonWebEncryption, error) {
 }
 
 // parseEncryptedCompact parses a message in compact format.
-func parseEncryptedCompact(input string) (*JsonWebEncryption, error) {
+func parseEncryptedCompact(input string) (*JSONWebEncryption, error) {
 	parts := strings.Split(input, ".")
 	if len(parts) != 5 {
 		return nil, fmt.Errorf("square/go-jose: compact JWE format must have five parts")
 	}
 
-	rawProtected, err := base64URLDecode(parts[0])
+	rawProtected, err := base64.RawURLEncoding.DecodeString(parts[0])
 	if err != nil {
 		return nil, err
 	}
 
-	encryptedKey, err := base64URLDecode(parts[1])
+	encryptedKey, err := base64.RawURLEncoding.DecodeString(parts[1])
 	if err != nil {
 		return nil, err
 	}
 
-	iv, err := base64URLDecode(parts[2])
+	iv, err := base64.RawURLEncoding.DecodeString(parts[2])
 	if err != nil {
 		return nil, err
 	}
 
-	ciphertext, err := base64URLDecode(parts[3])
+	ciphertext, err := base64.RawURLEncoding.DecodeString(parts[3])
 	if err != nil {
 		return nil, err
 	}
 
-	tag, err := base64URLDecode(parts[4])
+	tag, err := base64.RawURLEncoding.DecodeString(parts[4])
 	if err != nil {
 		return nil, err
 	}
 
-	raw := &rawJsonWebEncryption{
+	raw := &rawJSONWebEncryption{
 		Protected:    newBuffer(rawProtected),
 		EncryptedKey: newBuffer(encryptedKey),
 		Iv:           newBuffer(iv),
@@ -229,7 +240,7 @@ func parseEncryptedCompact(input string) (*JsonWebEncryption, error) {
 }
 
 // CompactSerialize serializes an object using the compact serialization format.
-func (obj JsonWebEncryption) CompactSerialize() (string, error) {
+func (obj JSONWebEncryption) CompactSerialize() (string, error) {
 	if len(obj.recipients) != 1 || obj.unprotected != nil ||
 		obj.protected == nil || obj.recipients[0].header != nil {
 		return "", ErrNotSupported
@@ -239,16 +250,16 @@ func (obj JsonWebEncryption) CompactSerialize() (string, error) {
 
 	return fmt.Sprintf(
 		"%s.%s.%s.%s.%s",
-		base64URLEncode(serializedProtected),
-		base64URLEncode(obj.recipients[0].encryptedKey),
-		base64URLEncode(obj.iv),
-		base64URLEncode(obj.ciphertext),
-		base64URLEncode(obj.tag)), nil
+		base64.RawURLEncoding.EncodeToString(serializedProtected),
+		base64.RawURLEncoding.EncodeToString(obj.recipients[0].encryptedKey),
+		base64.RawURLEncoding.EncodeToString(obj.iv),
+		base64.RawURLEncoding.EncodeToString(obj.ciphertext),
+		base64.RawURLEncoding.EncodeToString(obj.tag)), nil
 }
 
 // FullSerialize serializes an object using the full JSON serialization format.
-func (obj JsonWebEncryption) FullSerialize() string {
-	raw := rawJsonWebEncryption{
+func (obj JSONWebEncryption) FullSerialize() string {
+	raw := rawJSONWebEncryption{
 		Unprotected:  obj.unprotected,
 		Iv:           newBuffer(obj.iv),
 		Ciphertext:   newBuffer(obj.ciphertext),
@@ -262,7 +273,7 @@ func (obj JsonWebEncryption) FullSerialize() string {
 		for _, recipient := range obj.recipients {
 			info := rawRecipientInfo{
 				Header:       recipient.header,
-				EncryptedKey: base64URLEncode(recipient.encryptedKey),
+				EncryptedKey: base64.RawURLEncoding.EncodeToString(recipient.encryptedKey),
 			}
 			raw.Recipients = append(raw.Recipients, info)
 		}

vendor/gopkg.in/square/go-jose.v2/jwk-keygen/main.go

+/*-
+ * Copyright 2017 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package main
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/rsa"
+	"encoding/base32"
+	"errors"
+	"fmt"
+	"golang.org/x/crypto/ed25519"
+	"io"
+	"os"
+
+	"gopkg.in/alecthomas/kingpin.v2"
+	"gopkg.in/square/go-jose.v2"
+)
+
+var (
+	app = kingpin.New("jwk-keygen", "A command-line utility to generate public/pirvate keypairs in JWK format.")
+
+	use = app.Flag("use", "Desrired key use").Required().Enum("enc", "sig")
+	alg = app.Flag("alg", "Generate key to be used for ALG").Required().Enum(
+		// `sig`
+		string(jose.ES256), string(jose.ES384), string(jose.ES512), string(jose.EdDSA),
+		string(jose.RS256), string(jose.RS384), string(jose.RS512), string(jose.PS256), string(jose.PS384), string(jose.PS512),
+		// `enc`
+		string(jose.RSA1_5), string(jose.RSA_OAEP), string(jose.RSA_OAEP_256),
+		string(jose.ECDH_ES), string(jose.ECDH_ES_A128KW), string(jose.ECDH_ES_A192KW), string(jose.ECDH_ES_A256KW),
+	)
+	bits    = app.Flag("bits", "Key size in bits").Int()
+	kid     = app.Flag("kid", "Key ID").String()
+	kidRand = app.Flag("kid-rand", "Generate random Key ID").Bool()
+)
+
+// KeygenSig generates keypair for corresponding SignatureAlgorithm.
+func KeygenSig(alg jose.SignatureAlgorithm, bits int) (crypto.PublicKey, crypto.PrivateKey, error) {
+	switch alg {
+	case jose.ES256, jose.ES384, jose.ES512, jose.EdDSA:
+		keylen := map[jose.SignatureAlgorithm]int{
+			jose.ES256: 256,
+			jose.ES384: 384,
+			jose.ES512: 521, // sic!
+			jose.EdDSA: 256,
+		}
+		if bits != 0 && bits != keylen[alg] {
+			return nil, nil, errors.New("this `alg` does not support arbitrary key length")
+		}
+	case jose.RS256, jose.RS384, jose.RS512, jose.PS256, jose.PS384, jose.PS512:
+		if bits == 0 {
+			bits = 2048
+		}
+		if bits < 2048 {
+			return nil, nil, errors.New("too short key for RSA `alg`, 2048+ is required")
+		}
+	}
+	switch alg {
+	case jose.ES256:
+		// The cryptographic operations are implemented using constant-time algorithms.
+		key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+		return key.Public(), key, err
+	case jose.ES384:
+		// NB: The cryptographic operations do not use constant-time algorithms.
+		key, err := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
+		return key.Public(), key, err
+	case jose.ES512:
+		// NB: The cryptographic operations do not use constant-time algorithms.
+		key, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
+		return key.Public(), key, err
+	case jose.EdDSA:
+		pub, key, err := ed25519.GenerateKey(rand.Reader)
+		return pub, key, err
+	case jose.RS256, jose.RS384, jose.RS512, jose.PS256, jose.PS384, jose.PS512:
+		key, err := rsa.GenerateKey(rand.Reader, bits)
+		return key.Public(), key, err
+	default:
+		return nil, nil, errors.New("unknown `alg` for `use` = `sig`")
+	}
+}
+
+// KeygenEnc generates keypair for corresponding KeyAlgorithm.
+func KeygenEnc(alg jose.KeyAlgorithm, bits int) (crypto.PublicKey, crypto.PrivateKey, error) {
+	switch alg {
+	case jose.RSA1_5, jose.RSA_OAEP, jose.RSA_OAEP_256:
+		if bits == 0 {
+			bits = 2048
+		}
+		if bits < 2048 {
+			return nil, nil, errors.New("too short key for RSA `alg`, 2048+ is required")
+		}
+		key, err := rsa.GenerateKey(rand.Reader, bits)
+		return key.Public(), key, err
+	case jose.ECDH_ES, jose.ECDH_ES_A128KW, jose.ECDH_ES_A192KW, jose.ECDH_ES_A256KW:
+		var crv elliptic.Curve
+		switch bits {
+		case 0, 256:
+			crv = elliptic.P256()
+		case 384:
+			crv = elliptic.P384()
+		case 521:
+			crv = elliptic.P521()
+		default:
+			return nil, nil, errors.New("unknown elliptic curve bit length, use one of 256, 384, 521")
+		}
+		key, err := ecdsa.GenerateKey(crv, rand.Reader)
+		return key.Public(), key, err
+	default:
+		return nil, nil, errors.New("unknown `alg` for `use` = `enc`")
+	}
+}
+
+func main() {
+	app.Version("v2")
+	kingpin.MustParse(app.Parse(os.Args[1:]))
+
+	if *kidRand {
+		if *kid == "" {
+			b := make([]byte, 5)
+			_, err := rand.Read(b)
+			app.FatalIfError(err, "can't Read() crypto/rand")
+			*kid = base32.StdEncoding.EncodeToString(b)
+		} else {
+			app.FatalUsage("can't combine --kid and --kid-rand")
+		}
+	}
+
+	var privKey crypto.PublicKey
+	var pubKey crypto.PrivateKey
+	var err error
+	switch *use {
+	case "sig":
+		pubKey, privKey, err = KeygenSig(jose.SignatureAlgorithm(*alg), *bits)
+	case "enc":
+		pubKey, privKey, err = KeygenEnc(jose.KeyAlgorithm(*alg), *bits)
+	}
+	app.FatalIfError(err, "unable to generate key")
+
+	priv := jose.JSONWebKey{Key: privKey, KeyID: *kid, Algorithm: *alg, Use: *use}
+	pub := jose.JSONWebKey{Key: pubKey, KeyID: *kid, Algorithm: *alg, Use: *use}
+
+	if priv.IsPublic() || !pub.IsPublic() || !priv.Valid() || !pub.Valid() {
+		app.Fatalf("invalid keys were generated")
+	}
+
+	privJS, err := priv.MarshalJSON()
+	app.FatalIfError(err, "can't Marshal private key to JSON")
+	pubJS, err := pub.MarshalJSON()
+	app.FatalIfError(err, "can't Marshal public key to JSON")
+
+	if *kid == "" {
+		fmt.Printf("==> jwk_%s.pub <==\n", *alg)
+		fmt.Println(string(pubJS))
+		fmt.Printf("==> jwk_%s <==\n", *alg)
+		fmt.Println(string(privJS))
+	} else {
+		// JWK Thumbprint (RFC7638) is not used for key id because of
+		// lack of canonical representation.
+		fname := fmt.Sprintf("jwk_%s_%s_%s", *use, *alg, *kid)
+		err = writeNewFile(fname+".pub", pubJS, 0444)
+		app.FatalIfError(err, "can't write public key to file %s.pub", fname)
+		fmt.Printf("Written public key to %s.pub\n", fname)
+		err = writeNewFile(fname, privJS, 0400)
+		app.FatalIfError(err, "cant' write private key to file %s", fname)
+		fmt.Printf("Written private key to %s\n", fname)
+	}
+}
+
+// writeNewFile is shameless copy-paste from ioutil.WriteFile with a bit
+// different flags for OpenFile.
+func writeNewFile(filename string, data []byte, perm os.FileMode) error {
+	f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_EXCL, perm)
+	if err != nil {
+		return err
+	}
+	n, err := f.Write(data)
+	if err == nil && n < len(data) {
+		err = io.ErrShortWrite
+	}
+	if err1 := f.Close(); err == nil {
+		err = err1
+	}
+	return err
+}

vendor/gopkg.in/square/go-jose.v1/jwk.go → vendor/gopkg.in/square/go-jose.v2/jwk.go

@@ -29,11 +29,13 @@ import (
 	"reflect"
 	"strings"
 
-	"gopkg.in/square/go-jose.v1/json"
+	"golang.org/x/crypto/ed25519"
+
+	"gopkg.in/square/go-jose.v2/json"
 )
 
-// rawJsonWebKey represents a public or private key in JWK format, used for parsing/serializing.
-type rawJsonWebKey struct {
+// rawJSONWebKey represents a public or private key in JWK format, used for parsing/serializing.
+type rawJSONWebKey struct {
 	Use string      `json:"use,omitempty"`
 	Kty string      `json:"kty,omitempty"`
 	Kid string      `json:"kid,omitempty"`
@@ -58,8 +60,8 @@ type rawJsonWebKey struct {
 	X5c []string `json:"x5c,omitempty"`
 }
 
-// JsonWebKey represents a public or private key in JWK format.
-type JsonWebKey struct {
+// JSONWebKey represents a public or private key in JWK format.
+type JSONWebKey struct {
 	Key          interface{}
 	Certificates []*x509.Certificate
 	KeyID        string
@@ -68,15 +70,19 @@ type JsonWebKey struct {
 }
 
 // MarshalJSON serializes the given key to its JSON representation.
-func (k JsonWebKey) MarshalJSON() ([]byte, error) {
-	var raw *rawJsonWebKey
+func (k JSONWebKey) MarshalJSON() ([]byte, error) {
+	var raw *rawJSONWebKey
 	var err error
 
 	switch key := k.Key.(type) {
+	case ed25519.PublicKey:
+		raw = fromEdPublicKey(key)
 	case *ecdsa.PublicKey:
 		raw, err = fromEcPublicKey(key)
 	case *rsa.PublicKey:
 		raw = fromRsaPublicKey(key)
+	case ed25519.PrivateKey:
+		raw, err = fromEdPrivateKey(key)
 	case *ecdsa.PrivateKey:
 		raw, err = fromEcPrivateKey(key)
 	case *rsa.PrivateKey:
@@ -103,8 +109,8 @@ func (k JsonWebKey) MarshalJSON() ([]byte, error) {
 }
 
 // UnmarshalJSON reads a key from its JSON representation.
-func (k *JsonWebKey) UnmarshalJSON(data []byte) (err error) {
-	var raw rawJsonWebKey
+func (k *JSONWebKey) UnmarshalJSON(data []byte) (err error) {
+	var raw rawJSONWebKey
 	err = json.Unmarshal(data, &raw)
 	if err != nil {
 		return err
@@ -126,12 +132,22 @@ func (k *JsonWebKey) UnmarshalJSON(data []byte) (err error) {
 		}
 	case "oct":
 		key, err = raw.symmetricKey()
+	case "OKP":
+		if raw.Crv == "Ed25519" && raw.X != nil {
+			if raw.D != nil {
+				key, err = raw.edPrivateKey()
+			} else {
+				key, err = raw.edPublicKey()
+			}
+		} else {
+			err = fmt.Errorf("square/go-jose: unknown curve %s'", raw.Crv)
+		}
 	default:
 		err = fmt.Errorf("square/go-jose: unknown json web key type '%s'", raw.Kty)
 	}
 
 	if err == nil {
-		*k = JsonWebKey{Key: key, KeyID: raw.Kid, Algorithm: raw.Alg, Use: raw.Use}
+		*k = JSONWebKey{Key: key, KeyID: raw.Kid, Algorithm: raw.Alg, Use: raw.Use}
 	}
 
 	k.Certificates = make([]*x509.Certificate, len(raw.X5c))
@@ -149,17 +165,17 @@ func (k *JsonWebKey) UnmarshalJSON(data []byte) (err error) {
 	return
 }
 
-// JsonWebKeySet represents a JWK Set object.
-type JsonWebKeySet struct {
-	Keys []JsonWebKey `json:"keys"`
+// JSONWebKeySet represents a JWK Set object.
+type JSONWebKeySet struct {
+	Keys []JSONWebKey `json:"keys"`
 }
 
 // Key convenience method returns keys by key ID. Specification states
 // that a JWK Set "SHOULD" use distinct key IDs, but allows for some
 // cases where they are not distinct. Hence method returns a slice
-// of JsonWebKeys.
-func (s *JsonWebKeySet) Key(kid string) []JsonWebKey {
-	var keys []JsonWebKey
+// of JSONWebKeys.
+func (s *JSONWebKeySet) Key(kid string) []JSONWebKey {
+	var keys []JSONWebKey
 	for _, key := range s.Keys {
 		if key.KeyID == kid {
 			keys = append(keys, key)
@@ -171,6 +187,7 @@ func (s *JsonWebKeySet) Key(kid string) []JsonWebKey {
 
 const rsaThumbprintTemplate = `{"e":"%s","kty":"RSA","n":"%s"}`
 const ecThumbprintTemplate = `{"crv":"%s","kty":"EC","x":"%s","y":"%s"}`
+const edThumbprintTemplate = `{"crv":"%s","kty":"OKP",x":"%s"}`
 
 func ecThumbprintInput(curve elliptic.Curve, x, y *big.Int) (string, error) {
 	coordLength := curveSize(curve)
@@ -190,12 +207,20 @@ func rsaThumbprintInput(n *big.Int, e int) (string, error) {
 		newBuffer(n.Bytes()).base64()), nil
 }
 
+func edThumbprintInput(ed ed25519.PublicKey) (string, error) {
+	crv := "Ed25519"
+	return fmt.Sprintf(edThumbprintTemplate, crv,
+		newFixedSizeBuffer(ed, 32).base64()), nil
+}
+
 // Thumbprint computes the JWK Thumbprint of a key using the
 // indicated hash algorithm.
-func (k *JsonWebKey) Thumbprint(hash crypto.Hash) ([]byte, error) {
+func (k *JSONWebKey) Thumbprint(hash crypto.Hash) ([]byte, error) {
 	var input string
 	var err error
 	switch key := k.Key.(type) {
+	case ed25519.PublicKey:
+		input, err = edThumbprintInput(key)
 	case *ecdsa.PublicKey:
 		input, err = ecThumbprintInput(key.Curve, key.X, key.Y)
 	case *ecdsa.PrivateKey:
@@ -204,6 +229,8 @@ func (k *JsonWebKey) Thumbprint(hash crypto.Hash) ([]byte, error) {
 		input, err = rsaThumbprintInput(key.N, key.E)
 	case *rsa.PrivateKey:
 		input, err = rsaThumbprintInput(key.N, key.E)
+	case ed25519.PrivateKey:
+		input, err = edThumbprintInput(ed25519.PublicKey(key[0:32]))
 	default:
 		return nil, fmt.Errorf("square/go-jose: unknown key type '%s'", reflect.TypeOf(key))
 	}
@@ -218,17 +245,36 @@ func (k *JsonWebKey) Thumbprint(hash crypto.Hash) ([]byte, error) {
 }
 
 // IsPublic returns true if the JWK represents a public key (not symmetric, not private).
-func (k *JsonWebKey) IsPublic() bool {
+func (k *JSONWebKey) IsPublic() bool {
 	switch k.Key.(type) {
-	case *ecdsa.PublicKey, *rsa.PublicKey:
+	case *ecdsa.PublicKey, *rsa.PublicKey, ed25519.PublicKey:
 		return true
 	default:
 		return false
 	}
 }
 
+// Public creates JSONWebKey with corresponding publik key if JWK represents asymmetric private key.
+func (k *JSONWebKey) Public() JSONWebKey {
+	if k.IsPublic() {
+		return *k
+	}
+	ret := *k
+	switch key := k.Key.(type) {
+	case *ecdsa.PrivateKey:
+		ret.Key = key.Public()
+	case *rsa.PrivateKey:
+		ret.Key = key.Public()
+	case ed25519.PrivateKey:
+		ret.Key = key.Public()
+	default:
+		return JSONWebKey{} // returning invalid key
+	}
+	return ret
+}
+
 // Valid checks that the key contains the expected parameters.
-func (k *JsonWebKey) Valid() bool {
+func (k *JSONWebKey) Valid() bool {
 	if k.Key == nil {
 		return false
 	}
@@ -249,13 +295,21 @@ func (k *JsonWebKey) Valid() bool {
 		if key.N == nil || key.E == 0 || key.D == nil || len(key.Primes) < 2 {
 			return false
 		}
+	case ed25519.PublicKey:
+		if len(key) != 32 {
+			return false
+		}
+	case ed25519.PrivateKey:
+		if len(key) != 64 {
+			return false
+		}
 	default:
 		return false
 	}
 	return true
 }
 
-func (key rawJsonWebKey) rsaPublicKey() (*rsa.PublicKey, error) {
+func (key rawJSONWebKey) rsaPublicKey() (*rsa.PublicKey, error) {
 	if key.N == nil || key.E == nil {
 		return nil, fmt.Errorf("square/go-jose: invalid RSA key, missing n/e values")
 	}
@@ -266,15 +320,23 @@ func (key rawJsonWebKey) rsaPublicKey() (*rsa.PublicKey, error) {
 	}, nil
 }
 
-func fromRsaPublicKey(pub *rsa.PublicKey) *rawJsonWebKey {
-	return &rawJsonWebKey{
+func fromEdPublicKey(pub ed25519.PublicKey) *rawJSONWebKey {
+	return &rawJSONWebKey{
+		Kty: "OKP",
+		Crv: "Ed25519",
+		X:   newBuffer(pub),
+	}
+}
+
+func fromRsaPublicKey(pub *rsa.PublicKey) *rawJSONWebKey {
+	return &rawJSONWebKey{
 		Kty: "RSA",
 		N:   newBuffer(pub.N.Bytes()),
 		E:   newBufferFromInt(uint64(pub.E)),
 	}
 }
 
-func (key rawJsonWebKey) ecPublicKey() (*ecdsa.PublicKey, error) {
+func (key rawJSONWebKey) ecPublicKey() (*ecdsa.PublicKey, error) {
 	var curve elliptic.Curve
 	switch key.Crv {
 	case "P-256":
@@ -305,7 +367,7 @@ func (key rawJsonWebKey) ecPublicKey() (*ecdsa.PublicKey, error) {
 	}, nil
 }
 
-func fromEcPublicKey(pub *ecdsa.PublicKey) (*rawJsonWebKey, error) {
+func fromEcPublicKey(pub *ecdsa.PublicKey) (*rawJSONWebKey, error) {
 	if pub == nil || pub.X == nil || pub.Y == nil {
 		return nil, fmt.Errorf("square/go-jose: invalid EC key (nil, or X/Y missing)")
 	}
@@ -324,7 +386,7 @@ func fromEcPublicKey(pub *ecdsa.PublicKey) (*rawJsonWebKey, error) {
 		return nil, fmt.Errorf("square/go-jose: invalid EC key (X/Y too large)")
 	}
 
-	key := &rawJsonWebKey{
+	key := &rawJSONWebKey{
 		Kty: "EC",
 		Crv: name,
 		X:   newFixedSizeBuffer(xBytes, size),
@@ -334,7 +396,37 @@ func fromEcPublicKey(pub *ecdsa.PublicKey) (*rawJsonWebKey, error) {
 	return key, nil
 }
 
-func (key rawJsonWebKey) rsaPrivateKey() (*rsa.PrivateKey, error) {
+func (key rawJSONWebKey) edPrivateKey() (ed25519.PrivateKey, error) {
+	var missing []string
+	switch {
+	case key.D == nil:
+		missing = append(missing, "D")
+	case key.X == nil:
+		missing = append(missing, "X")
+	}
+
+	if len(missing) > 0 {
+		return nil, fmt.Errorf("square/go-jose: invalid Ed25519 private key, missing %s value(s)", strings.Join(missing, ", "))
+	}
+
+	privateKey := make([]byte, ed25519.PrivateKeySize)
+	copy(privateKey[0:32], key.X.bytes())
+	copy(privateKey[32:], key.D.bytes())
+	rv := ed25519.PrivateKey(privateKey)
+	return rv, nil
+}
+
+func (key rawJSONWebKey) edPublicKey() (ed25519.PublicKey, error) {
+	if key.X == nil {
+		return nil, fmt.Errorf("square/go-jose: invalid Ed key, missing x value")
+	}
+	publicKey := make([]byte, ed25519.PublicKeySize)
+	copy(publicKey[0:32], key.X.bytes())
+	rv := ed25519.PublicKey(publicKey)
+	return rv, nil
+}
+
+func (key rawJSONWebKey) rsaPrivateKey() (*rsa.PrivateKey, error) {
 	var missing []string
 	switch {
 	case key.N == nil:
@@ -379,7 +471,14 @@ func (key rawJsonWebKey) rsaPrivateKey() (*rsa.PrivateKey, error) {
 	return rv, err
 }
 
-func fromRsaPrivateKey(rsa *rsa.PrivateKey) (*rawJsonWebKey, error) {
+func fromEdPrivateKey(ed ed25519.PrivateKey) (*rawJSONWebKey, error) {
+	raw := fromEdPublicKey(ed25519.PublicKey(ed[0:32]))
+
+	raw.D = newBuffer(ed[32:])
+	return raw, nil
+}
+
+func fromRsaPrivateKey(rsa *rsa.PrivateKey) (*rawJSONWebKey, error) {
 	if len(rsa.Primes) != 2 {
 		return nil, ErrUnsupportedKeyType
 	}
@@ -393,7 +492,7 @@ func fromRsaPrivateKey(rsa *rsa.PrivateKey) (*rawJsonWebKey, error) {
 	return raw, nil
 }
 
-func (key rawJsonWebKey) ecPrivateKey() (*ecdsa.PrivateKey, error) {
+func (key rawJSONWebKey) ecPrivateKey() (*ecdsa.PrivateKey, error) {
 	var curve elliptic.Curve
 	switch key.Crv {
 	case "P-256":
@@ -427,7 +526,7 @@ func (key rawJsonWebKey) ecPrivateKey() (*ecdsa.PrivateKey, error) {
 	}, nil
 }
 
-func fromEcPrivateKey(ec *ecdsa.PrivateKey) (*rawJsonWebKey, error) {
+func fromEcPrivateKey(ec *ecdsa.PrivateKey) (*rawJSONWebKey, error) {
 	raw, err := fromEcPublicKey(&ec.PublicKey)
 	if err != nil {
 		return nil, err
@@ -442,14 +541,14 @@ func fromEcPrivateKey(ec *ecdsa.PrivateKey) (*rawJsonWebKey, error) {
 	return raw, nil
 }
 
-func fromSymmetricKey(key []byte) (*rawJsonWebKey, error) {
-	return &rawJsonWebKey{
+func fromSymmetricKey(key []byte) (*rawJSONWebKey, error) {
+	return &rawJSONWebKey{
 		Kty: "oct",
 		K:   newBuffer(key),
 	}, nil
 }
 
-func (key rawJsonWebKey) symmetricKey() ([]byte, error) {
+func (key rawJSONWebKey) symmetricKey() ([]byte, error) {
 	if key.K == nil {
 		return nil, fmt.Errorf("square/go-jose: invalid OCT (symmetric) key, missing k value")
 	}

vendor/gopkg.in/square/go-jose.v1/jws.go → vendor/gopkg.in/square/go-jose.v2/jws.go

@@ -17,15 +17,16 @@
 package jose
 
 import (
+	"encoding/base64"
 	"errors"
 	"fmt"
 	"strings"
 
-	"gopkg.in/square/go-jose.v1/json"
+	"gopkg.in/square/go-jose.v2/json"
 )
 
-// rawJsonWebSignature represents a raw JWS JSON object. Used for parsing/serializing.
-type rawJsonWebSignature struct {
+// rawJSONWebSignature represents a raw JWS JSON object. Used for parsing/serializing.
+type rawJSONWebSignature struct {
 	Payload    *byteBuffer        `json:"payload,omitempty"`
 	Signatures []rawSignatureInfo `json:"signatures,omitempty"`
 	Protected  *byteBuffer        `json:"protected,omitempty"`
@@ -40,8 +41,8 @@ type rawSignatureInfo struct {
 	Signature *byteBuffer `json:"signature,omitempty"`
 }
 
-// JsonWebSignature represents a signed JWS object after parsing.
-type JsonWebSignature struct {
+// JSONWebSignature represents a signed JWS object after parsing.
+type JSONWebSignature struct {
 	payload []byte
 	// Signatures attached to this object (may be more than one for multi-sig).
 	// Be careful about accessing these directly, prefer to use Verify() or
@@ -51,8 +52,19 @@ type JsonWebSignature struct {
 
 // Signature represents a single signature over the JWS payload and protected header.
 type Signature struct {
-	// Header fields, such as the signature algorithm
-	Header JoseHeader
+	// Merged header fields. Contains both protected and unprotected header
+	// values. Prefer using Protected and Unprotected fields instead of this.
+	// Values in this header may or may not have been signed and in general
+	// should not be trusted.
+	Header Header
+
+	// Protected header. Values in this header were signed and
+	// will be verified as part of the signature verification process.
+	Protected Header
+
+	// Unprotected header. Values in this header were not signed
+	// and in general should not be trusted.
+	Unprotected Header
 
 	// The actual signature value
 	Signature []byte
@@ -63,7 +75,7 @@ type Signature struct {
 }
 
 // ParseSigned parses a signed message in compact or full serialization format.
-func ParseSigned(input string) (*JsonWebSignature, error) {
+func ParseSigned(input string) (*JSONWebSignature, error) {
 	input = stripWhitespace(input)
 	if strings.HasPrefix(input, "{") {
 		return parseSignedFull(input)
@@ -81,25 +93,25 @@ func (sig Signature) mergedHeaders() rawHeader {
 }
 
 // Compute data to be signed
-func (obj JsonWebSignature) computeAuthData(signature *Signature) []byte {
+func (obj JSONWebSignature) computeAuthData(signature *Signature) []byte {
 	var serializedProtected string
 
 	if signature.original != nil && signature.original.Protected != nil {
 		serializedProtected = signature.original.Protected.base64()
 	} else if signature.protected != nil {
-		serializedProtected = base64URLEncode(mustSerializeJSON(signature.protected))
+		serializedProtected = base64.RawURLEncoding.EncodeToString(mustSerializeJSON(signature.protected))
 	} else {
 		serializedProtected = ""
 	}
 
 	return []byte(fmt.Sprintf("%s.%s",
 		serializedProtected,
-		base64URLEncode(obj.payload)))
+		base64.RawURLEncoding.EncodeToString(obj.payload)))
 }
 
 // parseSignedFull parses a message in full format.
-func parseSignedFull(input string) (*JsonWebSignature, error) {
-	var parsed rawJsonWebSignature
+func parseSignedFull(input string) (*JSONWebSignature, error) {
+	var parsed rawJSONWebSignature
 	err := json.Unmarshal([]byte(input), &parsed)
 	if err != nil {
 		return nil, err
@@ -109,12 +121,12 @@ func parseSignedFull(input string) (*JsonWebSignature, error) {
 }
 
 // sanitized produces a cleaned-up JWS object from the raw JSON.
-func (parsed *rawJsonWebSignature) sanitized() (*JsonWebSignature, error) {
+func (parsed *rawJSONWebSignature) sanitized() (*JSONWebSignature, error) {
 	if parsed.Payload == nil {
 		return nil, fmt.Errorf("square/go-jose: missing payload in JWS message")
 	}
 
-	obj := &JsonWebSignature{
+	obj := &JSONWebSignature{
 		payload:    parsed.Payload.bytes(),
 		Signatures: make([]Signature, len(parsed.Signatures)),
 	}
@@ -131,7 +143,7 @@ func (parsed *rawJsonWebSignature) sanitized() (*JsonWebSignature, error) {
 		}
 
 		// Check that there is not a nonce in the unprotected header
-		if parsed.Header != nil && parsed.Header.Nonce != "" {
+		if parsed.Header != nil && parsed.Header.getNonce() != "" {
 			return nil, ErrUnprotectedNonce
 		}
 
@@ -152,10 +164,28 @@ func (parsed *rawJsonWebSignature) sanitized() (*JsonWebSignature, error) {
 			Signature: parsed.Signature,
 		}
 
-		signature.Header = signature.mergedHeaders().sanitized()
+		var err error
+		signature.Header, err = signature.mergedHeaders().sanitized()
+		if err != nil {
+			return nil, err
+		}
+
+		if signature.header != nil {
+			signature.Unprotected, err = signature.header.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		if signature.protected != nil {
+			signature.Protected, err = signature.protected.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
 
 		// As per RFC 7515 Section 4.1.3, only public keys are allowed to be embedded.
-		jwk := signature.Header.JsonWebKey
+		jwk := signature.Header.JSONWebKey
 		if jwk != nil && (!jwk.Valid() || !jwk.IsPublic()) {
 			return nil, errors.New("square/go-jose: invalid embedded jwk, must be public key")
 		}
@@ -173,15 +203,34 @@ func (parsed *rawJsonWebSignature) sanitized() (*JsonWebSignature, error) {
 		}
 
 		// Check that there is not a nonce in the unprotected header
-		if sig.Header != nil && sig.Header.Nonce != "" {
+		if sig.Header != nil && sig.Header.getNonce() != "" {
 			return nil, ErrUnprotectedNonce
 		}
 
-		obj.Signatures[i].Header = obj.Signatures[i].mergedHeaders().sanitized()
+		var err error
+		obj.Signatures[i].Header, err = obj.Signatures[i].mergedHeaders().sanitized()
+		if err != nil {
+			return nil, err
+		}
+
+		if obj.Signatures[i].header != nil {
+			obj.Signatures[i].Unprotected, err = obj.Signatures[i].header.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		if obj.Signatures[i].protected != nil {
+			obj.Signatures[i].Protected, err = obj.Signatures[i].protected.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
+
 		obj.Signatures[i].Signature = sig.Signature.bytes()
 
 		// As per RFC 7515 Section 4.1.3, only public keys are allowed to be embedded.
-		jwk := obj.Signatures[i].Header.JsonWebKey
+		jwk := obj.Signatures[i].Header.JSONWebKey
 		if jwk != nil && (!jwk.Valid() || !jwk.IsPublic()) {
 			return nil, errors.New("square/go-jose: invalid embedded jwk, must be public key")
 		}
@@ -197,28 +246,28 @@ func (parsed *rawJsonWebSignature) sanitized() (*JsonWebSignature, error) {
 }
 
 // parseSignedCompact parses a message in compact format.
-func parseSignedCompact(input string) (*JsonWebSignature, error) {
+func parseSignedCompact(input string) (*JSONWebSignature, error) {
 	parts := strings.Split(input, ".")
 	if len(parts) != 3 {
 		return nil, fmt.Errorf("square/go-jose: compact JWS format must have three parts")
 	}
 
-	rawProtected, err := base64URLDecode(parts[0])
+	rawProtected, err := base64.RawURLEncoding.DecodeString(parts[0])
 	if err != nil {
 		return nil, err
 	}
 
-	payload, err := base64URLDecode(parts[1])
+	payload, err := base64.RawURLEncoding.DecodeString(parts[1])
 	if err != nil {
 		return nil, err
 	}
 
-	signature, err := base64URLDecode(parts[2])
+	signature, err := base64.RawURLEncoding.DecodeString(parts[2])
 	if err != nil {
 		return nil, err
 	}
 
-	raw := &rawJsonWebSignature{
+	raw := &rawJSONWebSignature{
 		Payload:   newBuffer(payload),
 		Protected: newBuffer(rawProtected),
 		Signature: newBuffer(signature),
@@ -227,7 +276,7 @@ func parseSignedCompact(input string) (*JsonWebSignature, error) {
 }
 
 // CompactSerialize serializes an object using the compact serialization format.
-func (obj JsonWebSignature) CompactSerialize() (string, error) {
+func (obj JSONWebSignature) CompactSerialize() (string, error) {
 	if len(obj.Signatures) != 1 || obj.Signatures[0].header != nil || obj.Signatures[0].protected == nil {
 		return "", ErrNotSupported
 	}
@@ -236,14 +285,14 @@ func (obj JsonWebSignature) CompactSerialize() (string, error) {
 
 	return fmt.Sprintf(
 		"%s.%s.%s",
-		base64URLEncode(serializedProtected),
-		base64URLEncode(obj.payload),
-		base64URLEncode(obj.Signatures[0].Signature)), nil
+		base64.RawURLEncoding.EncodeToString(serializedProtected),
+		base64.RawURLEncoding.EncodeToString(obj.payload),
+		base64.RawURLEncoding.EncodeToString(obj.Signatures[0].Signature)), nil
 }
 
 // FullSerialize serializes an object using the full JSON serialization format.
-func (obj JsonWebSignature) FullSerialize() string {
-	raw := rawJsonWebSignature{
+func (obj JSONWebSignature) FullSerialize() string {
+	raw := rawJSONWebSignature{
 		Payload: newBuffer(obj.payload),
 	}
 

vendor/gopkg.in/square/go-jose.v2/jwt/builder.go

+/*-
+ * Copyright 2016 Zbigniew Mandziejewicz
+ * Copyright 2016 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jwt
+
+import (
+	"bytes"
+	"reflect"
+
+	"gopkg.in/square/go-jose.v2/json"
+
+	"gopkg.in/square/go-jose.v2"
+)
+
+// Builder is a utility for making JSON Web Tokens. Calls can be chained, and
+// errors are accumulated until the final call to CompactSerialize/FullSerialize.
+type Builder interface {
+	// Claims encodes claims into JWE/JWS form. Multiple calls will merge claims
+	// into single JSON object. If you are passing private claims, make sure to set
+	// struct field tags to specify the name for the JSON key to be used when
+	// serializing.
+	Claims(i interface{}) Builder
+	// Token builds a JSONWebToken from provided data.
+	Token() (*JSONWebToken, error)
+	// FullSerialize serializes a token using the full serialization format.
+	FullSerialize() (string, error)
+	// CompactSerialize serializes a token using the compact serialization format.
+	CompactSerialize() (string, error)
+}
+
+// NestedBuilder is a utility for making Signed-Then-Encrypted JSON Web Tokens.
+// Calls can be chained, and errors are accumulated until final call to
+// CompactSerialize/FullSerialize.
+type NestedBuilder interface {
+	// Claims encodes claims into JWE/JWS form. Multiple calls will merge claims
+	// into single JSON object. If you are passing private claims, make sure to set
+	// struct field tags to specify the name for the JSON key to be used when
+	// serializing.
+	Claims(i interface{}) NestedBuilder
+	// Token builds a NestedJSONWebToken from provided data.
+	Token() (*NestedJSONWebToken, error)
+	// FullSerialize serializes a token using the full serialization format.
+	FullSerialize() (string, error)
+	// CompactSerialize serializes a token using the compact serialization format.
+	CompactSerialize() (string, error)
+}
+
+type builder struct {
+	payload map[string]interface{}
+	err     error
+}
+
+type signedBuilder struct {
+	builder
+	sig jose.Signer
+}
+
+type encryptedBuilder struct {
+	builder
+	enc jose.Encrypter
+}
+
+type nestedBuilder struct {
+	builder
+	sig jose.Signer
+	enc jose.Encrypter
+}
+
+// Signed creates builder for signed tokens.
+func Signed(sig jose.Signer) Builder {
+	return &signedBuilder{
+		sig: sig,
+	}
+}
+
+// Encrypted creates builder for encrypted tokens.
+func Encrypted(enc jose.Encrypter) Builder {
+	return &encryptedBuilder{
+		enc: enc,
+	}
+}
+
+// SignedAndEncrypted creates builder for signed-then-encrypted tokens.
+// ErrInvalidContentType will be returned if encrypter doesn't have JWT content type.
+func SignedAndEncrypted(sig jose.Signer, enc jose.Encrypter) NestedBuilder {
+	if contentType, _ := enc.Options().ExtraHeaders[jose.HeaderContentType].(jose.ContentType); contentType != "JWT" {
+		return &nestedBuilder{
+			builder: builder{
+				err: ErrInvalidContentType,
+			},
+		}
+	}
+	return &nestedBuilder{
+		sig: sig,
+		enc: enc,
+	}
+}
+
+func (b builder) claims(i interface{}) builder {
+	if b.err != nil {
+		return b
+	}
+
+	m, ok := i.(map[string]interface{})
+	switch {
+	case ok:
+		return b.merge(m)
+	case reflect.Indirect(reflect.ValueOf(i)).Kind() == reflect.Struct:
+		m, err := normalize(i)
+		if err != nil {
+			return builder{
+				err: err,
+			}
+		}
+		return b.merge(m)
+	default:
+		return builder{
+			err: ErrInvalidClaims,
+		}
+	}
+}
+
+func normalize(i interface{}) (map[string]interface{}, error) {
+	m := make(map[string]interface{})
+
+	raw, err := json.Marshal(i)
+	if err != nil {
+		return nil, err
+	}
+
+	d := json.NewDecoder(bytes.NewReader(raw))
+	d.UseNumber()
+
+	if err := d.Decode(&m); err != nil {
+		return nil, err
+	}
+
+	return m, nil
+}
+
+func (b *builder) merge(m map[string]interface{}) builder {
+	p := make(map[string]interface{})
+	for k, v := range b.payload {
+		p[k] = v
+	}
+	for k, v := range m {
+		p[k] = v
+	}
+
+	return builder{
+		payload: p,
+	}
+}
+
+func (b *builder) token(p func(interface{}) ([]byte, error), h []jose.Header) (*JSONWebToken, error) {
+	return &JSONWebToken{
+		payload: p,
+		Headers: h,
+	}, nil
+}
+
+func (b *signedBuilder) Claims(i interface{}) Builder {
+	return &signedBuilder{
+		builder: b.builder.claims(i),
+		sig:     b.sig,
+	}
+}
+
+func (b *signedBuilder) Token() (*JSONWebToken, error) {
+	sig, err := b.sign()
+	if err != nil {
+		return nil, err
+	}
+
+	h := make([]jose.Header, len(sig.Signatures))
+	for i, v := range sig.Signatures {
+		h[i] = v.Header
+	}
+
+	return b.builder.token(sig.Verify, h)
+}
+
+func (b *signedBuilder) CompactSerialize() (string, error) {
+	sig, err := b.sign()
+	if err != nil {
+		return "", err
+	}
+
+	return sig.CompactSerialize()
+}
+
+func (b *signedBuilder) FullSerialize() (string, error) {
+	sig, err := b.sign()
+	if err != nil {
+		return "", err
+	}
+
+	return sig.FullSerialize(), nil
+}
+
+func (b *signedBuilder) sign() (*jose.JSONWebSignature, error) {
+	if b.err != nil {
+		return nil, b.err
+	}
+
+	p, err := json.Marshal(b.payload)
+	if err != nil {
+		return nil, err
+	}
+
+	return b.sig.Sign(p)
+}
+
+func (b *encryptedBuilder) Claims(i interface{}) Builder {
+	return &encryptedBuilder{
+		builder: b.builder.claims(i),
+		enc:     b.enc,
+	}
+}
+
+func (b *encryptedBuilder) CompactSerialize() (string, error) {
+	enc, err := b.encrypt()
+	if err != nil {
+		return "", err
+	}
+
+	return enc.CompactSerialize()
+}
+
+func (b *encryptedBuilder) FullSerialize() (string, error) {
+	enc, err := b.encrypt()
+	if err != nil {
+		return "", err
+	}
+
+	return enc.FullSerialize(), nil
+}
+
+func (b *encryptedBuilder) Token() (*JSONWebToken, error) {
+	enc, err := b.encrypt()
+	if err != nil {
+		return nil, err
+	}
+
+	return b.builder.token(enc.Decrypt, []jose.Header{enc.Header})
+}
+
+func (b *encryptedBuilder) encrypt() (*jose.JSONWebEncryption, error) {
+	if b.err != nil {
+		return nil, b.err
+	}
+
+	p, err := json.Marshal(b.payload)
+	if err != nil {
+		return nil, err
+	}
+
+	return b.enc.Encrypt(p)
+}
+
+func (b *nestedBuilder) Claims(i interface{}) NestedBuilder {
+	return &nestedBuilder{
+		builder: b.builder.claims(i),
+		sig:     b.sig,
+		enc:     b.enc,
+	}
+}
+
+func (b *nestedBuilder) Token() (*NestedJSONWebToken, error) {
+	enc, err := b.signAndEncrypt()
+	if err != nil {
+		return nil, err
+	}
+
+	return &NestedJSONWebToken{
+		enc:     enc,
+		Headers: []jose.Header{enc.Header},
+	}, nil
+}
+
+func (b *nestedBuilder) CompactSerialize() (string, error) {
+	enc, err := b.signAndEncrypt()
+	if err != nil {
+		return "", err
+	}
+
+	return enc.CompactSerialize()
+}
+
+func (b *nestedBuilder) FullSerialize() (string, error) {
+	enc, err := b.signAndEncrypt()
+	if err != nil {
+		return "", err
+	}
+
+	return enc.FullSerialize(), nil
+}
+
+func (b *nestedBuilder) signAndEncrypt() (*jose.JSONWebEncryption, error) {
+	if b.err != nil {
+		return nil, b.err
+	}
+
+	p, err := json.Marshal(b.payload)
+	if err != nil {
+		return nil, err
+	}
+
+	sig, err := b.sig.Sign(p)
+	if err != nil {
+		return nil, err
+	}
+
+	p2, err := sig.CompactSerialize()
+	if err != nil {
+		return nil, err
+	}
+
+	return b.enc.Encrypt([]byte(p2))
+}

vendor/gopkg.in/square/go-jose.v2/jwt/claims.go

+/*-
+ * Copyright 2016 Zbigniew Mandziejewicz
+ * Copyright 2016 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jwt
+
+import (
+	"encoding/json"
+	"strconv"
+	"time"
+)
+
+// Claims represents public claim values (as specified in RFC 7519).
+type Claims struct {
+	Issuer    string      `json:"iss,omitempty"`
+	Subject   string      `json:"sub,omitempty"`
+	Audience  Audience    `json:"aud,omitempty"`
+	Expiry    NumericDate `json:"exp,omitempty"`
+	NotBefore NumericDate `json:"nbf,omitempty"`
+	IssuedAt  NumericDate `json:"iat,omitempty"`
+	ID        string      `json:"jti,omitempty"`
+}
+
+// NumericDate represents date and time as the number of seconds since the
+// epoch, including leap seconds. Non-integer values can be represented
+// in the serialized format, but we round to the nearest second.
+type NumericDate int64
+
+// NewNumericDate constructs NumericDate from time.Time value.
+func NewNumericDate(t time.Time) NumericDate {
+	if t.IsZero() {
+		return NumericDate(0)
+	}
+
+	// While RFC 7519 technically states that NumericDate values may be
+	// non-integer values, we don't bother serializing timestamps in
+	// claims with sub-second accurancy and just round to the nearest
+	// second instead. Not convined sub-second accuracy is useful here.
+	return NumericDate(t.Unix())
+}
+
+// MarshalJSON serializes the given NumericDate into its JSON representation.
+func (n NumericDate) MarshalJSON() ([]byte, error) {
+	return []byte(strconv.FormatInt(int64(n), 10)), nil
+}
+
+// UnmarshalJSON reads a date from its JSON representation.
+func (n *NumericDate) UnmarshalJSON(b []byte) error {
+	s := string(b)
+
+	f, err := strconv.ParseFloat(s, 64)
+	if err != nil {
+		return ErrUnmarshalNumericDate
+	}
+
+	*n = NumericDate(f)
+	return nil
+}
+
+// Time returns time.Time representation of NumericDate.
+func (n NumericDate) Time() time.Time {
+	return time.Unix(int64(n), 0)
+}
+
+// Audience represents the recipents that the token is intended for.
+type Audience []string
+
+// UnmarshalJSON reads an audience from its JSON representation.
+func (s *Audience) UnmarshalJSON(b []byte) error {
+	var v interface{}
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+
+	switch v := v.(type) {
+	case string:
+		*s = []string{v}
+	case []interface{}:
+		a := make([]string, len(v))
+		for i, e := range v {
+			s, ok := e.(string)
+			if !ok {
+				return ErrUnmarshalAudience
+			}
+			a[i] = s
+		}
+		*s = a
+	default:
+		return ErrUnmarshalAudience
+	}
+
+	return nil
+}
+
+func (s Audience) Contains(v string) bool {
+	for _, a := range s {
+		if a == v {
+			return true
+		}
+	}
+	return false
+}

vendor/gopkg.in/square/go-jose.v2/jwt/doc.go

+/*-
+ * Copyright 2017 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+
+Package jwt provides an implementation of the JSON Web Token standard.
+
+*/
+package jwt

vendor/gopkg.in/square/go-jose.v2/jwt/errors.go

+/*-
+ * Copyright 2016 Zbigniew Mandziejewicz
+ * Copyright 2016 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jwt
+
+import "errors"
+
+// ErrUnmarshalAudience indicates that aud claim could not be unmarshalled.
+var ErrUnmarshalAudience = errors.New("square/go-jose/jwt: expected string or array value to unmarshal to Audience")
+
+// ErrUnmarshalNumericDate indicates that JWT NumericDate could not be unmarshalled.
+var ErrUnmarshalNumericDate = errors.New("square/go-jose/jwt: expected number value to unmarshal NumericDate")
+
+// ErrInvalidClaims indicates that given claims have invalid type.
+var ErrInvalidClaims = errors.New("square/go-jose/jwt: expected claims to be value convertible into JSON object")
+
+// ErrInvalidIssuer indicates invalid iss claim.
+var ErrInvalidIssuer = errors.New("square/go-jose/jwt: validation failed, invalid issuer claim (iss)")
+
+// ErrInvalidSubject indicates invalid sub claim.
+var ErrInvalidSubject = errors.New("square/go-jose/jwt: validation failed, invalid subject claim (sub)")
+
+// ErrInvalidAudience indicated invalid aud claim.
+var ErrInvalidAudience = errors.New("square/go-jose/jwt: validation failed, invalid audience claim (aud)")
+
+// ErrInvalidID indicates invalid jti claim.
+var ErrInvalidID = errors.New("square/go-jose/jwt: validation failed, invalid ID claim (jti)")
+
+// ErrNotValidYet indicates that token is used before time indicated in nbf claim.
+var ErrNotValidYet = errors.New("square/go-jose/jwt: validation failed, token not valid yet (nbf)")
+
+// ErrExpired indicates that token is used after expiry time indicated in exp claim.
+var ErrExpired = errors.New("square/go-jose/jwt: validation failed, token is expired (exp)")
+
+// ErrInvalidContentType indicated that token requires JWT cty header.
+var ErrInvalidContentType = errors.New("square/go-jose/jwt: expected content type to be JWT (cty header)")

vendor/gopkg.in/square/go-jose.v2/jwt/jwt.go

+/*-
+ * Copyright 2016 Zbigniew Mandziejewicz
+ * Copyright 2016 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jwt
+
+import (
+	"gopkg.in/square/go-jose.v2"
+	"gopkg.in/square/go-jose.v2/json"
+	"strings"
+)
+
+// JSONWebToken represents a JSON Web Token (as specified in RFC7519).
+type JSONWebToken struct {
+	payload func(k interface{}) ([]byte, error)
+	Headers []jose.Header
+}
+
+type NestedJSONWebToken struct {
+	enc     *jose.JSONWebEncryption
+	Headers []jose.Header
+}
+
+// Claims deserializes a JSONWebToken into dest using the provided key.
+func (t *JSONWebToken) Claims(key interface{}, dest ...interface{}) error {
+	b, err := t.payload(key)
+	if err != nil {
+		return err
+	}
+
+	for _, d := range dest {
+		if err := json.Unmarshal(b, d); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (t *NestedJSONWebToken) Decrypt(decryptionKey interface{}) (*JSONWebToken, error) {
+	b, err := t.enc.Decrypt(decryptionKey)
+	if err != nil {
+		return nil, err
+	}
+
+	sig, err := ParseSigned(string(b))
+	if err != nil {
+		return nil, err
+	}
+
+	return sig, nil
+}
+
+// ParseSigned parses token from JWS form.
+func ParseSigned(s string) (*JSONWebToken, error) {
+	sig, err := jose.ParseSigned(s)
+	if err != nil {
+		return nil, err
+	}
+	headers := make([]jose.Header, len(sig.Signatures))
+	for i, signature := range sig.Signatures {
+		headers[i] = signature.Header
+	}
+
+	return &JSONWebToken{
+		payload: sig.Verify,
+		Headers: headers,
+	}, nil
+}
+
+// ParseEncrypted parses token from JWE form.
+func ParseEncrypted(s string) (*JSONWebToken, error) {
+	enc, err := jose.ParseEncrypted(s)
+	if err != nil {
+		return nil, err
+	}
+
+	return &JSONWebToken{
+		payload: enc.Decrypt,
+		Headers: []jose.Header{enc.Header},
+	}, nil
+}
+
+// ParseSignedAndEncrypted parses signed-then-encrypted token from JWE form.
+func ParseSignedAndEncrypted(s string) (*NestedJSONWebToken, error) {
+	enc, err := jose.ParseEncrypted(s)
+	if err != nil {
+		return nil, err
+	}
+
+	contentType, _ := enc.Header.ExtraHeaders[jose.HeaderContentType].(string)
+	if strings.ToUpper(contentType) != "JWT" {
+		return nil, ErrInvalidContentType
+	}
+
+	return &NestedJSONWebToken{
+		enc:     enc,
+		Headers: []jose.Header{enc.Header},
+	}, nil
+}

vendor/gopkg.in/square/go-jose.v2/jwt/validation.go

+/*-
+ * Copyright 2016 Zbigniew Mandziejewicz
+ * Copyright 2016 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jwt
+
+import "time"
+
+const (
+	// DefaultLeeway defines the default leeway for matching NotBefore/Expiry claims.
+	DefaultLeeway = 1.0 * time.Minute
+)
+
+// Expected defines values used for protected claims validation.
+// If field has zero value then validation is skipped.
+type Expected struct {
+	// Issuer matches the "iss" claim exactly.
+	Issuer string
+	// Subject matches the "sub" claim exactly.
+	Subject string
+	// Audience matches the values in "aud" claim, regardless of their order.
+	Audience Audience
+	// ID matches the "jti" claim exactly.
+	ID string
+	// Time matches the "exp" and "ebf" claims with leeway.
+	Time time.Time
+}
+
+// WithTime copies expectations with new time.
+func (e Expected) WithTime(t time.Time) Expected {
+	e.Time = t
+	return e
+}
+
+// Validate checks claims in a token against expected values.
+// A default leeway value of one minute is used to compare time values.
+func (c Claims) Validate(e Expected) error {
+	return c.ValidateWithLeeway(e, DefaultLeeway)
+}
+
+// ValidateWithLeeway checks claims in a token against expected values. A
+// custom leeway may be specified for comparing time values. You may pass a
+// zero value to check time values with no leeway, but you should not that
+// numeric date values are rounded to the nearest second and sub-second
+// precision is not supported.
+func (c Claims) ValidateWithLeeway(e Expected, leeway time.Duration) error {
+	if e.Issuer != "" && e.Issuer != c.Issuer {
+		return ErrInvalidIssuer
+	}
+
+	if e.Subject != "" && e.Subject != c.Subject {
+		return ErrInvalidSubject
+	}
+
+	if e.ID != "" && e.ID != c.ID {
+		return ErrInvalidID
+	}
+
+	if len(e.Audience) != 0 {
+		for _, v := range e.Audience {
+			if !c.Audience.Contains(v) {
+				return ErrInvalidAudience
+			}
+		}
+	}
+
+	if !e.Time.IsZero() && e.Time.Add(leeway).Before(c.NotBefore.Time()) {
+		return ErrNotValidYet
+	}
+
+	if !e.Time.IsZero() && e.Time.Add(-leeway).After(c.Expiry.Time()) {
+		return ErrExpired
+	}
+
+	return nil
+}

vendor/gopkg.in/square/go-jose.v1/shared.go → vendor/gopkg.in/square/go-jose.v2/shared.go

@@ -20,6 +20,8 @@ import (
 	"crypto/elliptic"
 	"errors"
 	"fmt"
+
+	"gopkg.in/square/go-jose.v2/json"
 )
 
 // KeyAlgorithm represents a key management algorithm.
@@ -34,6 +36,9 @@ type ContentEncryption string
 // CompressionAlgorithm represents an algorithm used for plaintext compression.
 type CompressionAlgorithm string
 
+// ContentType represents type of the contained data.
+type ContentType string
+
 var (
 	// ErrCryptoFailure represents an error in cryptographic primitive. This
 	// occurs when, for example, a message had an invalid authentication tag or
@@ -63,6 +68,7 @@ var (
 
 // Key management algorithms
 const (
+	ED25519            = KeyAlgorithm("ED25519")
 	RSA1_5             = KeyAlgorithm("RSA1_5")             // RSA-PKCS1v1.5
 	RSA_OAEP           = KeyAlgorithm("RSA-OAEP")           // RSA-OAEP-SHA1
 	RSA_OAEP_256       = KeyAlgorithm("RSA-OAEP-256")       // RSA-OAEP-SHA256
@@ -84,6 +90,7 @@ const (
 
 // Signature algorithms
 const (
+	EdDSA = SignatureAlgorithm("EdDSA")
 	HS256 = SignatureAlgorithm("HS256") // HMAC using SHA-256
 	HS384 = SignatureAlgorithm("HS384") // HMAC using SHA-384
 	HS512 = SignatureAlgorithm("HS512") // HMAC using SHA-512
@@ -114,84 +121,265 @@ const (
 	DEFLATE = CompressionAlgorithm("DEF") // DEFLATE (RFC 1951)
 )
 
+// A key in the protected header of a JWS object. Use of the Header...
+// constants is preferred to enhance type safety.
+type HeaderKey string
+
+const (
+	HeaderType        HeaderKey = "typ" // string
+	HeaderContentType           = "cty" // string
+
+	// These are set by go-jose and shouldn't need to be set by consumers of the
+	// library.
+	headerAlgorithm   = "alg"  // string
+	headerEncryption  = "enc"  // ContentEncryption
+	headerCompression = "zip"  // CompressionAlgorithm
+	headerCritical    = "crit" // []string
+
+	headerAPU = "apu" // *byteBuffer
+	headerAPV = "apv" // *byteBuffer
+	headerEPK = "epk" // *JSONWebKey
+	headerIV  = "iv"  // *byteBuffer
+	headerTag = "tag" // *byteBuffer
+
+	headerJWK   = "jwk"   // *JSONWebKey
+	headerKeyID = "kid"   // string
+	headerNonce = "nonce" // string
+)
+
 // rawHeader represents the JOSE header for JWE/JWS objects (used for parsing).
-type rawHeader struct {
-	Alg   string               `json:"alg,omitempty"`
-	Enc   ContentEncryption    `json:"enc,omitempty"`
-	Zip   CompressionAlgorithm `json:"zip,omitempty"`
-	Crit  []string             `json:"crit,omitempty"`
-	Apu   *byteBuffer          `json:"apu,omitempty"`
-	Apv   *byteBuffer          `json:"apv,omitempty"`
-	Epk   *JsonWebKey          `json:"epk,omitempty"`
-	Iv    *byteBuffer          `json:"iv,omitempty"`
-	Tag   *byteBuffer          `json:"tag,omitempty"`
-	Jwk   *JsonWebKey          `json:"jwk,omitempty"`
-	Kid   string               `json:"kid,omitempty"`
-	Nonce string               `json:"nonce,omitempty"`
-}
-
-// JoseHeader represents the read-only JOSE header for JWE/JWS objects.
-type JoseHeader struct {
+//
+// The decoding of the constituent items is deferred because we want to marshal
+// some members into particular structs rather than generic maps, but at the
+// same time we need to receive any extra fields unhandled by this library to
+// pass through to consuming code in case it wants to examine them.
+type rawHeader map[HeaderKey]*json.RawMessage
+
+// Header represents the read-only JOSE header for JWE/JWS objects.
+type Header struct {
 	KeyID      string
-	JsonWebKey *JsonWebKey
+	JSONWebKey *JSONWebKey
 	Algorithm  string
 	Nonce      string
+
+	// Any headers not recognised above get unmarshaled from JSON in a generic
+	// manner and placed in this map.
+	ExtraHeaders map[HeaderKey]interface{}
 }
 
-// sanitized produces a cleaned-up header object from the raw JSON.
-func (parsed rawHeader) sanitized() JoseHeader {
-	return JoseHeader{
-		KeyID:      parsed.Kid,
-		JsonWebKey: parsed.Jwk,
-		Algorithm:  parsed.Alg,
-		Nonce:      parsed.Nonce,
+func (parsed rawHeader) set(k HeaderKey, v interface{}) error {
+	b, err := json.Marshal(v)
+	if err != nil {
+		return err
 	}
+
+	parsed[k] = makeRawMessage(b)
+	return nil
 }
 
-// Merge headers from src into dst, giving precedence to headers from l.
-func (dst *rawHeader) merge(src *rawHeader) {
-	if src == nil {
-		return
+// getString gets a string from the raw JSON, defaulting to "".
+func (parsed rawHeader) getString(k HeaderKey) string {
+	v, ok := parsed[k]
+	if !ok {
+		return ""
+	}
+	var s string
+	err := json.Unmarshal(*v, &s)
+	if err != nil {
+		return ""
 	}
+	return s
+}
 
-	if dst.Alg == "" {
-		dst.Alg = src.Alg
+// getByteBuffer gets a byte buffer from the raw JSON. Returns (nil, nil) if
+// not specified.
+func (parsed rawHeader) getByteBuffer(k HeaderKey) (*byteBuffer, error) {
+	v := parsed[k]
+	if v == nil {
+		return nil, nil
 	}
-	if dst.Enc == "" {
-		dst.Enc = src.Enc
+	var bb *byteBuffer
+	err := json.Unmarshal(*v, &bb)
+	if err != nil {
+		return nil, err
 	}
-	if dst.Zip == "" {
-		dst.Zip = src.Zip
+	return bb, nil
+}
+
+// getAlgorithm extracts parsed "alg" from the raw JSON as a KeyAlgorithm.
+func (parsed rawHeader) getAlgorithm() KeyAlgorithm {
+	return KeyAlgorithm(parsed.getString(headerAlgorithm))
+}
+
+// getSignatureAlgorithm extracts parsed "alg" from the raw JSON as a SignatureAlgorithm.
+func (parsed rawHeader) getSignatureAlgorithm() SignatureAlgorithm {
+	return SignatureAlgorithm(parsed.getString(headerAlgorithm))
+}
+
+// getEncryption extracts parsed "enc" from the raw JSON.
+func (parsed rawHeader) getEncryption() ContentEncryption {
+	return ContentEncryption(parsed.getString(headerEncryption))
+}
+
+// getCompression extracts parsed "zip" from the raw JSON.
+func (parsed rawHeader) getCompression() CompressionAlgorithm {
+	return CompressionAlgorithm(parsed.getString(headerCompression))
+}
+
+func (parsed rawHeader) getNonce() string {
+	return parsed.getString(headerNonce)
+}
+
+// getEPK extracts parsed "epk" from the raw JSON.
+func (parsed rawHeader) getEPK() (*JSONWebKey, error) {
+	v := parsed[headerEPK]
+	if v == nil {
+		return nil, nil
 	}
-	if dst.Crit == nil {
-		dst.Crit = src.Crit
+	var epk *JSONWebKey
+	err := json.Unmarshal(*v, &epk)
+	if err != nil {
+		return nil, err
 	}
-	if dst.Crit == nil {
-		dst.Crit = src.Crit
+	return epk, nil
+}
+
+// getAPU extracts parsed "apu" from the raw JSON.
+func (parsed rawHeader) getAPU() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerAPU)
+}
+
+// getAPV extracts parsed "apv" from the raw JSON.
+func (parsed rawHeader) getAPV() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerAPV)
+}
+
+// getIV extracts parsed "iv" frpom the raw JSON.
+func (parsed rawHeader) getIV() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerIV)
+}
+
+// getTag extracts parsed "tag" frpom the raw JSON.
+func (parsed rawHeader) getTag() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerTag)
+}
+
+// getJWK extracts parsed "jwk" from the raw JSON.
+func (parsed rawHeader) getJWK() (*JSONWebKey, error) {
+	v := parsed[headerJWK]
+	if v == nil {
+		return nil, nil
+	}
+	var jwk *JSONWebKey
+	err := json.Unmarshal(*v, &jwk)
+	if err != nil {
+		return nil, err
+	}
+	return jwk, nil
+}
+
+// getCritical extracts parsed "crit" from the raw JSON. If omitted, it
+// returns an empty slice.
+func (parsed rawHeader) getCritical() ([]string, error) {
+	v := parsed[headerCritical]
+	if v == nil {
+		return nil, nil
+	}
+
+	var q []string
+	err := json.Unmarshal(*v, &q)
+	if err != nil {
+		return nil, err
+	}
+	return q, nil
+}
+
+// sanitized produces a cleaned-up header object from the raw JSON.
+func (parsed rawHeader) sanitized() (h Header, err error) {
+	for k, v := range parsed {
+		if v == nil {
+			continue
+		}
+		switch k {
+		case headerJWK:
+			var jwk *JSONWebKey
+			err = json.Unmarshal(*v, &jwk)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal JWK: %v: %#v", err, string(*v))
+				return
+			}
+			h.JSONWebKey = jwk
+		case headerKeyID:
+			var s string
+			err = json.Unmarshal(*v, &s)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal key ID: %v: %#v", err, string(*v))
+				return
+			}
+			h.KeyID = s
+		case headerAlgorithm:
+			var s string
+			err = json.Unmarshal(*v, &s)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal algorithm: %v: %#v", err, string(*v))
+				return
+			}
+			h.Algorithm = s
+		case headerNonce:
+			var s string
+			err = json.Unmarshal(*v, &s)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal nonce: %v: %#v", err, string(*v))
+				return
 			}
-	if dst.Apu == nil {
-		dst.Apu = src.Apu
+			h.Nonce = s
+		default:
+			if h.ExtraHeaders == nil {
+				h.ExtraHeaders = map[HeaderKey]interface{}{}
 			}
-	if dst.Apv == nil {
-		dst.Apv = src.Apv
+			var v2 interface{}
+			err = json.Unmarshal(*v, &v2)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal value: %v: %#v", err, string(*v))
+				return
 			}
-	if dst.Epk == nil {
-		dst.Epk = src.Epk
+			h.ExtraHeaders[k] = v2
 		}
-	if dst.Iv == nil {
-		dst.Iv = src.Iv
 	}
-	if dst.Tag == nil {
-		dst.Tag = src.Tag
+	return
+}
+
+func (dst rawHeader) isSet(k HeaderKey) bool {
+	dvr := dst[k]
+	if dvr == nil {
+		return false
 	}
-	if dst.Kid == "" {
-		dst.Kid = src.Kid
+
+	var dv interface{}
+	err := json.Unmarshal(*dvr, &dv)
+	if err != nil {
+		return true
 	}
-	if dst.Jwk == nil {
-		dst.Jwk = src.Jwk
+
+	if dvStr, ok := dv.(string); ok {
+		return dvStr != ""
 	}
-	if dst.Nonce == "" {
-		dst.Nonce = src.Nonce
+
+	return true
+}
+
+// Merge headers from src into dst, giving precedence to headers from l.
+func (dst rawHeader) merge(src *rawHeader) {
+	if src == nil {
+		return
+	}
+
+	for k, v := range *src {
+		if dst.isSet(k) {
+			continue
+		}
+
+		dst[k] = v
 	}
 }
 
@@ -222,3 +410,8 @@ func curveSize(crv elliptic.Curve) int {
 
 	return div + 1
 }
+
+func makeRawMessage(b []byte) *json.RawMessage {
+	rm := json.RawMessage(b)
+	return &rm
+}

vendor/gopkg.in/square/go-jose.v1/signing.go → vendor/gopkg.in/square/go-jose.v2/signing.go

@@ -19,8 +19,13 @@ package jose
 import (
 	"crypto/ecdsa"
 	"crypto/rsa"
+	"encoding/base64"
 	"errors"
 	"fmt"
+
+	"golang.org/x/crypto/ed25519"
+
+	"gopkg.in/square/go-jose.v2/json"
 )
 
 // NonceSource represents a source of random nonces to go into JWS objects
@@ -30,17 +35,46 @@ type NonceSource interface {
 
 // Signer represents a signer which takes a payload and produces a signed JWS object.
 type Signer interface {
-	Sign(payload []byte) (*JsonWebSignature, error)
-	SetNonceSource(source NonceSource)
-	SetEmbedJwk(embed bool)
+	Sign(payload []byte) (*JSONWebSignature, error)
+	Options() SignerOptions
 }
 
-// MultiSigner represents a signer which supports multiple recipients.
-type MultiSigner interface {
-	Sign(payload []byte) (*JsonWebSignature, error)
-	SetNonceSource(source NonceSource)
-	SetEmbedJwk(embed bool)
-	AddRecipient(alg SignatureAlgorithm, signingKey interface{}) error
+// SigningKey represents an algorithm/key used to sign a message.
+type SigningKey struct {
+	Algorithm SignatureAlgorithm
+	Key       interface{}
+}
+
+// SignerOptions represents options that can be set when creating signers.
+type SignerOptions struct {
+	NonceSource NonceSource
+	EmbedJWK    bool
+
+	// Optional map of additional keys to be inserted into the protected header
+	// of a JWS object. Some specifications which make use of JWS like to insert
+	// additional values here. All values must be JSON-serializable.
+	ExtraHeaders map[HeaderKey]interface{}
+}
+
+// WithHeader adds an arbitrary value to the ExtraHeaders map, initializing it
+// if necessary. It returns itself and so can be used in a fluent style.
+func (so *SignerOptions) WithHeader(k HeaderKey, v interface{}) *SignerOptions {
+	if so.ExtraHeaders == nil {
+		so.ExtraHeaders = map[HeaderKey]interface{}{}
+	}
+	so.ExtraHeaders[k] = v
+	return so
+}
+
+// WithContentType adds a content type ("cty") header and returns the updated
+// SignerOptions.
+func (so *SignerOptions) WithContentType(contentType ContentType) *SignerOptions {
+	return so.WithHeader(HeaderContentType, contentType)
+}
+
+// WithType adds a type ("typ") header and returns the updated SignerOptions.
+func (so *SignerOptions) WithType(typ ContentType) *SignerOptions {
+	return so.WithHeader(HeaderType, typ)
 }
 
 type payloadSigner interface {
@@ -54,40 +88,48 @@ type payloadVerifier interface {
 type genericSigner struct {
 	recipients   []recipientSigInfo
 	nonceSource  NonceSource
-	embedJwk    bool
+	embedJWK     bool
+	extraHeaders map[HeaderKey]interface{}
 }
 
 type recipientSigInfo struct {
 	sigAlg    SignatureAlgorithm
-	keyID     string
-	publicKey *JsonWebKey
+	publicKey *JSONWebKey
 	signer    payloadSigner
 }
 
 // NewSigner creates an appropriate signer based on the key type
-func NewSigner(alg SignatureAlgorithm, signingKey interface{}) (Signer, error) {
-	// NewMultiSigner never fails (currently)
-	signer := NewMultiSigner()
+func NewSigner(sig SigningKey, opts *SignerOptions) (Signer, error) {
+	return NewMultiSigner([]SigningKey{sig}, opts)
+}
 
-	err := signer.AddRecipient(alg, signingKey)
+// NewMultiSigner creates a signer for multiple recipients
+func NewMultiSigner(sigs []SigningKey, opts *SignerOptions) (Signer, error) {
+	signer := &genericSigner{recipients: []recipientSigInfo{}}
+
+	if opts != nil {
+		signer.nonceSource = opts.NonceSource
+		signer.embedJWK = opts.EmbedJWK
+		signer.extraHeaders = opts.ExtraHeaders
+	}
+
+	for _, sig := range sigs {
+		err := signer.addRecipient(sig.Algorithm, sig.Key)
 		if err != nil {
 			return nil, err
 		}
+	}
 
 	return signer, nil
 }
 
-// NewMultiSigner creates a signer for multiple recipients
-func NewMultiSigner() MultiSigner {
-	return &genericSigner{
-		recipients: []recipientSigInfo{},
-		embedJwk:   true,
-	}
-}
-
 // newVerifier creates a verifier based on the key type
 func newVerifier(verificationKey interface{}) (payloadVerifier, error) {
 	switch verificationKey := verificationKey.(type) {
+	case ed25519.PublicKey:
+		return &edEncrypterVerifier{
+			publicKey: verificationKey,
+		}, nil
 	case *rsa.PublicKey:
 		return &rsaEncrypterVerifier{
 			publicKey: verificationKey,
@@ -100,14 +142,16 @@ func newVerifier(verificationKey interface{}) (payloadVerifier, error) {
 		return &symmetricMac{
 			key: verificationKey,
 		}, nil
-	case *JsonWebKey:
+	case JSONWebKey:
+		return newVerifier(verificationKey.Key)
+	case *JSONWebKey:
 		return newVerifier(verificationKey.Key)
 	default:
 		return nil, ErrUnsupportedKeyType
 	}
 }
 
-func (ctx *genericSigner) AddRecipient(alg SignatureAlgorithm, signingKey interface{}) error {
+func (ctx *genericSigner) addRecipient(alg SignatureAlgorithm, signingKey interface{}) error {
 	recipient, err := makeJWSRecipient(alg, signingKey)
 	if err != nil {
 		return err
@@ -119,39 +163,68 @@ func (ctx *genericSigner) AddRecipient(alg SignatureAlgorithm, signingKey interf
 
 func makeJWSRecipient(alg SignatureAlgorithm, signingKey interface{}) (recipientSigInfo, error) {
 	switch signingKey := signingKey.(type) {
+	case ed25519.PrivateKey:
+		return newEd25519Signer(alg, signingKey)
 	case *rsa.PrivateKey:
 		return newRSASigner(alg, signingKey)
 	case *ecdsa.PrivateKey:
 		return newECDSASigner(alg, signingKey)
 	case []byte:
 		return newSymmetricSigner(alg, signingKey)
-	case *JsonWebKey:
+	case JSONWebKey:
+		return newJWKSigner(alg, signingKey)
+	case *JSONWebKey:
+		return newJWKSigner(alg, *signingKey)
+	default:
+		return recipientSigInfo{}, ErrUnsupportedKeyType
+	}
+}
+
+func newJWKSigner(alg SignatureAlgorithm, signingKey JSONWebKey) (recipientSigInfo, error) {
 	recipient, err := makeJWSRecipient(alg, signingKey.Key)
 	if err != nil {
 		return recipientSigInfo{}, err
 	}
-		recipient.keyID = signingKey.KeyID
-		return recipient, nil
-	default:
-		return recipientSigInfo{}, ErrUnsupportedKeyType
+	if recipient.publicKey != nil {
+		// recipient.publicKey is a JWK synthesized for embedding when recipientSigInfo
+		// was created for the inner key (such as a RSA or ECDSA public key). It contains
+		// the pub key for embedding, but doesn't have extra params like key id.
+		publicKey := signingKey
+		publicKey.Key = recipient.publicKey.Key
+		recipient.publicKey = &publicKey
+
+		// This should be impossible, but let's check anyway.
+		if !recipient.publicKey.IsPublic() {
+			return recipientSigInfo{}, errors.New("square/go-jose: public key was unexpectedly not public")
+		}
 	}
+	return recipient, nil
 }
 
-func (ctx *genericSigner) Sign(payload []byte) (*JsonWebSignature, error) {
-	obj := &JsonWebSignature{}
+func (ctx *genericSigner) Sign(payload []byte) (*JSONWebSignature, error) {
+	obj := &JSONWebSignature{}
 	obj.payload = payload
 	obj.Signatures = make([]Signature, len(ctx.recipients))
 
 	for i, recipient := range ctx.recipients {
-		protected := &rawHeader{
-			Alg: string(recipient.sigAlg),
+		protected := map[HeaderKey]interface{}{
+			headerAlgorithm: string(recipient.sigAlg),
 		}
 
-		if recipient.publicKey != nil && ctx.embedJwk {
-			protected.Jwk = recipient.publicKey
+		if recipient.publicKey != nil {
+			// We want to embed the JWK or set the kid header, but not both. Having a protected
+			// header that contains an embedded JWK while also simultaneously containing the kid
+			// header is confusing, and at least in ACME the two are considered to be mutually
+			// exclusive. The fact that both can exist at the same time is a somewhat unfortunate
+			// result of the JOSE spec. We've decided that this library will only include one or
+			// the other to avoid this confusion.
+			//
+			// See https://github.com/square/go-jose/issues/157 for more context.
+			if ctx.embedJWK {
+				protected[headerJWK] = recipient.publicKey
+			} else {
+				protected[headerKeyID] = recipient.publicKey.KeyID
 			}
-		if recipient.keyID != "" {
-			protected.Kid = recipient.keyID
 		}
 
 		if ctx.nonceSource != nil {
@@ -159,40 +232,44 @@ func (ctx *genericSigner) Sign(payload []byte) (*JsonWebSignature, error) {
 			if err != nil {
 				return nil, fmt.Errorf("square/go-jose: Error generating nonce: %v", err)
 			}
-			protected.Nonce = nonce
+			protected[headerNonce] = nonce
+		}
+
+		for k, v := range ctx.extraHeaders {
+			protected[k] = v
 		}
 
 		serializedProtected := mustSerializeJSON(protected)
 
 		input := []byte(fmt.Sprintf("%s.%s",
-			base64URLEncode(serializedProtected),
-			base64URLEncode(payload)))
+			base64.RawURLEncoding.EncodeToString(serializedProtected),
+			base64.RawURLEncoding.EncodeToString(payload)))
 
 		signatureInfo, err := recipient.signer.signPayload(input, recipient.sigAlg)
 		if err != nil {
 			return nil, err
 		}
 
-		signatureInfo.protected = protected
+		signatureInfo.protected = &rawHeader{}
+		for k, v := range protected {
+			b, err := json.Marshal(v)
+			if err != nil {
+				return nil, fmt.Errorf("square/go-jose: Error marshalling item %#v: %v", k, err)
+			}
+			(*signatureInfo.protected)[k] = makeRawMessage(b)
+		}
 		obj.Signatures[i] = signatureInfo
 	}
 
 	return obj, nil
 }
 
-// SetNonceSource provides or updates a nonce pool to the first recipients.
-// After this method is called, the signer will consume one nonce per
-// signature, returning an error it is unable to get a nonce.
-func (ctx *genericSigner) SetNonceSource(source NonceSource) {
-	ctx.nonceSource = source
-}
-
-// SetEmbedJwk specifies if the signing key should be embedded in the protected
-// header, if any. It defaults to 'true', though that may change in the future.
-// Note that the use of embedded JWKs in the signature header can be dangerous,
-// as you cannot assume that the key received in a payload is trusted.
-func (ctx *genericSigner) SetEmbedJwk(embed bool) {
-	ctx.embedJwk = embed
+func (ctx *genericSigner) Options() SignerOptions {
+	return SignerOptions{
+		NonceSource:  ctx.nonceSource,
+		EmbedJWK:     ctx.embedJWK,
+		ExtraHeaders: ctx.extraHeaders,
+	}
 }
 
 // Verify validates the signature on the object and returns the payload.
@@ -202,7 +279,7 @@ func (ctx *genericSigner) SetEmbedJwk(embed bool) {
 // Be careful when verifying signatures based on embedded JWKs inside the
 // payload header. You cannot assume that the key received in a payload is
 // trusted.
-func (obj JsonWebSignature) Verify(verificationKey interface{}) ([]byte, error) {
+func (obj JSONWebSignature) Verify(verificationKey interface{}) ([]byte, error) {
 	verifier, err := newVerifier(verificationKey)
 	if err != nil {
 		return nil, err
@@ -214,13 +291,17 @@ func (obj JsonWebSignature) Verify(verificationKey interface{}) ([]byte, error)
 
 	signature := obj.Signatures[0]
 	headers := signature.mergedHeaders()
-	if len(headers.Crit) > 0 {
+	critical, err := headers.getCritical()
+	if err != nil {
+		return nil, err
+	}
+	if len(critical) > 0 {
 		// Unsupported crit header
 		return nil, ErrCryptoFailure
 	}
 
 	input := obj.computeAuthData(&signature)
-	alg := SignatureAlgorithm(headers.Alg)
+	alg := headers.getSignatureAlgorithm()
 	err = verifier.verifyPayload(input, signature.Signature, alg)
 	if err == nil {
 		return obj.payload, nil
@@ -233,7 +314,7 @@ func (obj JsonWebSignature) Verify(verificationKey interface{}) ([]byte, error)
 // returns the index of the signature that was verified, along with the signature
 // object and the payload. We return the signature and index to guarantee that
 // callers are getting the verified value.
-func (obj JsonWebSignature) VerifyMulti(verificationKey interface{}) (int, Signature, []byte, error) {
+func (obj JSONWebSignature) VerifyMulti(verificationKey interface{}) (int, Signature, []byte, error) {
 	verifier, err := newVerifier(verificationKey)
 	if err != nil {
 		return -1, Signature{}, nil, err
@@ -241,14 +322,18 @@ func (obj JsonWebSignature) VerifyMulti(verificationKey interface{}) (int, Signa
 
 	for i, signature := range obj.Signatures {
 		headers := signature.mergedHeaders()
-		if len(headers.Crit) > 0 {
+		critical, err := headers.getCritical()
+		if err != nil {
+			continue
+		}
+		if len(critical) > 0 {
 			// Unsupported crit header
 			continue
 		}
 
 		input := obj.computeAuthData(&signature)
-		alg := SignatureAlgorithm(headers.Alg)
-		err := verifier.verifyPayload(input, signature.Signature, alg)
+		alg := headers.getSignatureAlgorithm()
+		err = verifier.verifyPayload(input, signature.Signature, alg)
 		if err == nil {
 			return i, signature, obj.payload, nil
 		}

vendor/gopkg.in/square/go-jose.v1/symmetric.go → vendor/gopkg.in/square/go-jose.v2/symmetric.go

@@ -25,10 +25,11 @@ import (
 	"crypto/sha512"
 	"crypto/subtle"
 	"errors"
+	"fmt"
 	"hash"
 	"io"
 
-	"gopkg.in/square/go-jose.v1/cipher"
+	"gopkg.in/square/go-jose.v2/cipher"
 )
 
 // Random reader (stubbed out in tests)
@@ -229,11 +230,12 @@ func (ctx *symmetricKeyCipher) encryptKey(cek []byte, alg KeyAlgorithm) (recipie
 			return recipientInfo{}, err
 		}
 
+		header := &rawHeader{}
+		header.set(headerIV, newBuffer(parts.iv))
+		header.set(headerTag, newBuffer(parts.tag))
+
 		return recipientInfo{
-			header: &rawHeader{
-				Iv:  newBuffer(parts.iv),
-				Tag: newBuffer(parts.tag),
-			},
+			header:       header,
 			encryptedKey: parts.ciphertext,
 		}, nil
 	case A128KW, A192KW, A256KW:
@@ -258,7 +260,7 @@ func (ctx *symmetricKeyCipher) encryptKey(cek []byte, alg KeyAlgorithm) (recipie
 
 // Decrypt the content encryption key.
 func (ctx *symmetricKeyCipher) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
-	switch KeyAlgorithm(headers.Alg) {
+	switch headers.getAlgorithm() {
 	case DIRECT:
 		cek := make([]byte, len(ctx.key))
 		copy(cek, ctx.key)
@@ -266,10 +268,19 @@ func (ctx *symmetricKeyCipher) decryptKey(headers rawHeader, recipient *recipien
 	case A128GCMKW, A192GCMKW, A256GCMKW:
 		aead := newAESGCM(len(ctx.key))
 
+		iv, err := headers.getIV()
+		if err != nil {
+			return nil, fmt.Errorf("square/go-jose: invalid IV: %v", err)
+		}
+		tag, err := headers.getTag()
+		if err != nil {
+			return nil, fmt.Errorf("square/go-jose: invalid tag: %v", err)
+		}
+
 		parts := &aeadParts{
-			iv:         headers.Iv.bytes(),
+			iv:         iv.bytes(),
 			ciphertext: recipient.encryptedKey,
-			tag:        headers.Tag.bytes(),
+			tag:        tag.bytes(),
 		}
 
 		cek, err := aead.decrypt(ctx.key, []byte{}, parts)

vendor/manifest

@@ -190,12 +190,12 @@
 			"notests": true
 		},
 		{
-			"importpath": "github.com/xenolf/lego/acme",
+			"importpath": "github.com/xenolf/lego/acmev2",
 			"repository": "https://github.com/xenolf/lego",
 			"vcs": "git",
-			"revision": "4dde48a9b9916926a8dd4f69639c8dba40930355",
-			"branch": "master",
-			"path": "/acme",
+			"revision": "805eec97569ff533e1b75b16eac0bdd94e67bdd6",
+			"branch": "acmev2",
+			"path": "/acmev2",
 			"notests": true
 		},
 		{
@@ -208,21 +208,21 @@
 			"notests": true
 		},
 		{
-			"importpath": "golang.org/x/crypto/acme",
+			"importpath": "golang.org/x/crypto/curve25519",
 			"repository": "https://go.googlesource.com/crypto",
 			"vcs": "git",
-			"revision": "2faea1465de239e4babd8f5905cc25b781712442",
+			"revision": "94eea52f7b742c7cbe0b03b22f0c4c8631ece122",
 			"branch": "master",
-			"path": "acme",
+			"path": "curve25519",
 			"notests": true
 		},
 		{
-			"importpath": "golang.org/x/crypto/curve25519",
+			"importpath": "golang.org/x/crypto/ed25519",
 			"repository": "https://go.googlesource.com/crypto",
 			"vcs": "git",
-			"revision": "94eea52f7b742c7cbe0b03b22f0c4c8631ece122",
+			"revision": "c4a91bd4f524f10d064139674cf55852e055ad01",
 			"branch": "master",
-			"path": "curve25519",
+			"path": "/ed25519",
 			"notests": true
 		},
 		{
@@ -447,10 +447,10 @@
 			"notests": true
 		},
 		{
-			"importpath": "gopkg.in/square/go-jose.v1",
-			"repository": "https://gopkg.in/square/go-jose.v1",
+			"importpath": "gopkg.in/square/go-jose.v2",
+			"repository": "https://gopkg.in/square/go-jose.v2",
 			"vcs": "git",
-			"revision": "aa2e30fdd1fe9dd3394119af66451ae790d50e0d",
+			"revision": "6ee92191fea850cdcab9a18867abf5f521cdbadb",
 			"branch": "master",
 			"notests": true
 		},