crypto/tls: decouple handshake signatures from the handshake hash.

Prior to TLS 1.2, the handshake had a pleasing property that one could
incrementally hash it and, from that, get the needed hashes for both
the CertificateVerify and Finished messages.

TLS 1.2 introduced negotiation for the signature and hash and it became
possible for the handshake hash to be, say, SHA-384, but for the
CertificateVerify to sign the handshake with SHA-1. The problem is that
one doesn't know in advance which hashes will be needed and thus the
handshake needs to be buffered.

Go ignored this, always kept a single handshake hash, and any signatures
over the handshake had to use that hash.

However, there are a set of servers that inspect the client's offered
signature hash functions and will abort the handshake if one of the
server's certificates is signed with a hash function outside of that
set. https://robertsspaceindustries.com/ is an example of such a server.

Clearly not a lot of thought happened when that server code was written,
but its out there and we have to deal with it.

This change decouples the handshake hash from the CertificateVerify
hash. This lays the groundwork for advertising support for SHA-384 but
doesn't actually make that change in the interests of reviewability.
Updating the advertised hash functions will cause changes in many of the
testdata/ files and some errors might get lost in the noise. This change
only needs to update four testdata/ files: one because a SHA-384-based
handshake is now being signed with SHA-256 and the others because the
TLS 1.2 CertificateRequest message now includes SHA-1.

This change also has the effect of adding support for
client-certificates in SSLv3 servers. However, SSLv3 is now disabled by
default so this should be moot.

It would be possible to avoid much of this change and just support
SHA-384 for the ServerKeyExchange as the SKX only signs over the nonces
and SKX params (a design mistake in TLS). However, that would leave Go
in the odd situation where it advertised support for SHA-384, but would
only use the handshake hash when signing client certificates. I fear
that'll just cause problems in the future.

Much of this code was written by davidben@ for the purposes of testing
BoringSSL.

Partly addresses #9757

Change-Id: I5137a472b6076812af387a5a69fc62c7373cd485
Reviewed-on: https://go-review.googlesource.com/9415
Run-TryBot: Adam Langley <agl@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>

src/crypto/tls/cipher_suites.go

@@ -5,7 +5,6 @@
 package tls
 
 import (
-	"crypto"
 	"crypto/aes"
 	"crypto/cipher"
 	"crypto/des"
@@ -49,6 +48,9 @@ const (
 	// suiteTLS12 indicates that the cipher suite should only be advertised
 	// and accepted when using TLS 1.2.
 	suiteTLS12
+	// suiteSHA384 indicates that the cipher suite uses SHA384 as the
+	// handshake hash.
+	suiteSHA384
 	// suiteDefaultOff indicates that this cipher suite is not included by
 	// default.
 	suiteDefaultOff
@@ -64,31 +66,30 @@ type cipherSuite struct {
 	ivLen  int
 	ka     func(version uint16) keyAgreement
 	// flags is a bitmask of the suite* values, above.
-	flags     int
-	cipher    func(key, iv []byte, isRead bool) interface{}
-	mac       func(version uint16, macKey []byte) macFunction
-	aead      func(key, fixedNonce []byte) cipher.AEAD
-	tls12Hash crypto.Hash
+	flags  int
+	cipher func(key, iv []byte, isRead bool) interface{}
+	mac    func(version uint16, macKey []byte) macFunction
+	aead   func(key, fixedNonce []byte) cipher.AEAD
 }
 
 var cipherSuites = []*cipherSuite{
 	// Ciphersuite order is chosen so that ECDHE comes before plain RSA
 	// and RC4 comes before AES (because of the Lucky13 attack).
-	{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadAESGCM, crypto.SHA256},
-	{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECDSA | suiteTLS12, nil, nil, aeadAESGCM, crypto.SHA256},
-	{TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadAESGCM, crypto.SHA384},
-	{TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECDSA | suiteTLS12, nil, nil, aeadAESGCM, crypto.SHA384},
-	{TLS_ECDHE_RSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheRSAKA, suiteECDHE | suiteDefaultOff, cipherRC4, macSHA1, nil, crypto.SHA256},
-	{TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheECDSAKA, suiteECDHE | suiteECDSA | suiteDefaultOff, cipherRC4, macSHA1, nil, crypto.SHA256},
-	{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil, crypto.SHA256},
-	{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECDSA, cipherAES, macSHA1, nil, crypto.SHA256},
-	{TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil, crypto.SHA256},
-	{TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECDSA, cipherAES, macSHA1, nil, crypto.SHA256},
-	{TLS_RSA_WITH_RC4_128_SHA, 16, 20, 0, rsaKA, suiteDefaultOff, cipherRC4, macSHA1, nil, crypto.SHA256},
-	{TLS_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil, crypto.SHA256},
-	{TLS_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil, crypto.SHA256},
-	{TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, ecdheRSAKA, suiteECDHE, cipher3DES, macSHA1, nil, crypto.SHA256},
-	{TLS_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, rsaKA, 0, cipher3DES, macSHA1, nil, crypto.SHA256},
+	{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadAESGCM},
+	{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECDSA | suiteTLS12, nil, nil, aeadAESGCM},
+	{TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
+	{TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECDSA | suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
+	{TLS_ECDHE_RSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheRSAKA, suiteECDHE | suiteDefaultOff, cipherRC4, macSHA1, nil},
+	{TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheECDSAKA, suiteECDHE | suiteECDSA | suiteDefaultOff, cipherRC4, macSHA1, nil},
+	{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil},
+	{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECDSA, cipherAES, macSHA1, nil},
+	{TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil},
+	{TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECDSA, cipherAES, macSHA1, nil},
+	{TLS_RSA_WITH_RC4_128_SHA, 16, 20, 0, rsaKA, suiteDefaultOff, cipherRC4, macSHA1, nil},
+	{TLS_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil},
+	{TLS_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil},
+	{TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, ecdheRSAKA, suiteECDHE, cipher3DES, macSHA1, nil},
+	{TLS_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, rsaKA, 0, cipher3DES, macSHA1, nil},
 }
 
 func cipherRC4(key, iv []byte, isRead bool) interface{} {

src/crypto/tls/common.go

@@ -141,23 +141,16 @@ type signatureAndHash struct {
 	hash, signature uint8
 }
 
-// supportedSKXSignatureAlgorithms contains the signature and hash algorithms
-// that the code advertises as supported in a TLS 1.2 ClientHello.
-var supportedSKXSignatureAlgorithms = []signatureAndHash{
+// supportedSignatureAlgorithms contains the signature and hash algorithms that
+// the code advertises as supported in a TLS 1.2 ClientHello and in a TLS 1.2
+// CertificateRequest.
+var supportedSignatureAlgorithms = []signatureAndHash{
 	{hashSHA256, signatureRSA},
 	{hashSHA256, signatureECDSA},
 	{hashSHA1, signatureRSA},
 	{hashSHA1, signatureECDSA},
 }
 
-// supportedClientCertSignatureAlgorithms contains the signature and hash
-// algorithms that the code advertises as supported in a TLS 1.2
-// CertificateRequest.
-var supportedClientCertSignatureAlgorithms = []signatureAndHash{
-	{hashSHA256, signatureRSA},
-	{hashSHA256, signatureECDSA},
-}
-
 // ConnectionState records basic TLS details about the connection.
 type ConnectionState struct {
 	Version                     uint16                // TLS version used by the connection (e.g. VersionTLS12)
@@ -705,3 +698,12 @@ func initDefaultCipherSuites() {
 func unexpectedMessageError(wanted, got interface{}) error {
 	return fmt.Errorf("tls: received unexpected handshake message of type %T when waiting for %T", got, wanted)
 }
+
+func isSupportedSignatureAndHash(sigHash signatureAndHash, sigHashes []signatureAndHash) bool {
+	for _, s := range sigHashes {
+		if s == sigHash {
+			return true
+		}
+	}
+	return false
+}

src/crypto/tls/handshake_client.go

@@ -89,7 +89,7 @@ NextCipherSuite:
 	}
 
 	if hello.vers >= VersionTLS12 {
-		hello.signatureAndHashes = supportedSKXSignatureAlgorithms
+		hello.signatureAndHashes = supportedSignatureAlgorithms
 	}
 
 	var session *ClientSessionState
@@ -169,18 +169,26 @@ NextCipherSuite:
 		serverHello:  serverHello,
 		hello:        hello,
 		suite:        suite,
-		finishedHash: newFinishedHash(c.vers, suite.tls12Hash),
+		finishedHash: newFinishedHash(c.vers, suite),
 		session:      session,
 	}
 
-	hs.finishedHash.Write(hs.hello.marshal())
-	hs.finishedHash.Write(hs.serverHello.marshal())
-
 	isResume, err := hs.processServerHello()
 	if err != nil {
 		return err
 	}
 
+	// No signatures of the handshake are needed in a resumption.
+	// Otherwise, in a full handshake, if we don't have any certificates
+	// configured then we will never send a CertificateVerify message and
+	// thus no signatures are needed in that case either.
+	if isResume || len(c.config.Certificates) == 0 {
+		hs.finishedHash.discardHandshakeBuffer()
+	}
+
+	hs.finishedHash.Write(hs.hello.marshal())
+	hs.finishedHash.Write(hs.serverHello.marshal())
+
 	if isResume {
 		if err := hs.establishKeys(); err != nil {
 			return err
@@ -424,7 +432,6 @@ func (hs *clientHandshakeState) doFullHandshake() error {
 	}
 
 	if chainToSend != nil {
-		var signed []byte
 		certVerify := &certificateVerifyMsg{
 			hasSignatureAndHash: c.vers >= VersionTLS12,
 		}
@@ -434,31 +441,42 @@ func (hs *clientHandshakeState) doFullHandshake() error {
 			c.sendAlert(alertInternalError)
 			return fmt.Errorf("tls: client certificate private key of type %T does not implement crypto.Signer", chainToSend.PrivateKey)
 		}
+
+		var signatureType uint8
 		switch key.Public().(type) {
 		case *ecdsa.PublicKey:
-			digest, hashFunc, hashId := hs.finishedHash.hashForClientCertificate(signatureECDSA)
-			signed, err = key.Sign(c.config.rand(), digest, hashFunc)
-			certVerify.signatureAndHash.signature = signatureECDSA
-			certVerify.signatureAndHash.hash = hashId
+			signatureType = signatureECDSA
 		case *rsa.PublicKey:
-			digest, hashFunc, hashId := hs.finishedHash.hashForClientCertificate(signatureRSA)
-			signed, err = key.Sign(c.config.rand(), digest, hashFunc)
-			certVerify.signatureAndHash.signature = signatureRSA
-			certVerify.signatureAndHash.hash = hashId
+			signatureType = signatureRSA
 		default:
-			err = fmt.Errorf("tls: unknown client certificate key type: %T", key)
+			c.sendAlert(alertInternalError)
+			return fmt.Errorf("tls: failed to sign handshake with client certificate: unknown client certificate key type: %T", key)
+		}
+
+		certVerify.signatureAndHash, err = hs.finishedHash.selectClientCertSignatureAlgorithm(certReq.signatureAndHashes, signatureType)
+		if err != nil {
+			c.sendAlert(alertInternalError)
+			return err
 		}
+		digest, hashFunc, err := hs.finishedHash.hashForClientCertificate(certVerify.signatureAndHash, hs.masterSecret)
 		if err != nil {
 			c.sendAlert(alertInternalError)
-			return errors.New("tls: failed to sign handshake with client certificate: " + err.Error())
+			return err
+		}
+		certVerify.signature, err = key.Sign(c.config.rand(), digest, hashFunc)
+		if err != nil {
+			c.sendAlert(alertInternalError)
+			return err
 		}
-		certVerify.signature = signed
 
 		hs.finishedHash.Write(certVerify.marshal())
 		c.writeRecord(recordTypeHandshake, certVerify.marshal())
 	}
 
-	hs.masterSecret = masterFromPreMasterSecret(c.vers, hs.suite.tls12Hash, preMasterSecret, hs.hello.random, hs.serverHello.random)
+	hs.masterSecret = masterFromPreMasterSecret(c.vers, hs.suite, preMasterSecret, hs.hello.random, hs.serverHello.random)
+
+	hs.finishedHash.discardHandshakeBuffer()
+
 	return nil
 }
 
@@ -466,7 +484,7 @@ func (hs *clientHandshakeState) establishKeys() error {
 	c := hs.c
 
 	clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV :=
-		keysFromMasterSecret(c.vers, hs.suite.tls12Hash, hs.masterSecret, hs.hello.random, hs.serverHello.random, hs.suite.macLen, hs.suite.keyLen, hs.suite.ivLen)
+		keysFromMasterSecret(c.vers, hs.suite, hs.masterSecret, hs.hello.random, hs.serverHello.random, hs.suite.macLen, hs.suite.keyLen, hs.suite.ivLen)
 	var clientCipher, serverCipher interface{}
 	var clientHash, serverHash macFunction
 	if hs.suite.cipher != nil {

src/crypto/tls/handshake_messages_test.go

@@ -136,7 +136,7 @@ func (*clientHelloMsg) Generate(rand *rand.Rand, size int) reflect.Value {
 		}
 	}
 	if rand.Intn(10) > 5 {
-		m.signatureAndHashes = supportedSKXSignatureAlgorithms
+		m.signatureAndHashes = supportedSignatureAlgorithms
 	}
 	m.alpnProtocols = make([]string, rand.Intn(5))
 	for i := range m.alpnProtocols {

src/crypto/tls/handshake_server.go

@@ -49,8 +49,6 @@ func (c *Conn) serverHandshake() error {
 	if err != nil {
 		return err
 	}
-	hs.finishedHash = newFinishedHash(hs.c.vers, hs.suite.tls12Hash)
-	hs.finishedHash.Write(hs.clientHello.marshal())
 
 	// For an overview of TLS handshaking, see https://tools.ietf.org/html/rfc5246#section-7.3
 	if isResume {
@@ -320,6 +318,9 @@ func (hs *serverHandshakeState) doResumeHandshake() error {
 	// that we're doing a resumption.
 	hs.hello.sessionId = hs.clientHello.sessionId
 	hs.hello.ticketSupported = hs.sessionState.usedOldKey
+	hs.finishedHash = newFinishedHash(c.vers, hs.suite)
+	hs.finishedHash.discardHandshakeBuffer()
+	hs.finishedHash.Write(hs.clientHello.marshal())
 	hs.finishedHash.Write(hs.hello.marshal())
 	c.writeRecord(recordTypeHandshake, hs.hello.marshal())
 
@@ -344,6 +345,14 @@ func (hs *serverHandshakeState) doFullHandshake() error {
 
 	hs.hello.ticketSupported = hs.clientHello.ticketSupported && !config.SessionTicketsDisabled
 	hs.hello.cipherSuite = hs.suite.id
+
+	hs.finishedHash = newFinishedHash(hs.c.vers, hs.suite)
+	if config.ClientAuth == NoClientCert {
+		// No need to keep a full record of the handshake if client
+		// certificates won't be used.
+		hs.finishedHash.discardHandshakeBuffer()
+	}
+	hs.finishedHash.Write(hs.clientHello.marshal())
 	hs.finishedHash.Write(hs.hello.marshal())
 	c.writeRecord(recordTypeHandshake, hs.hello.marshal())
 
@@ -380,7 +389,7 @@ func (hs *serverHandshakeState) doFullHandshake() error {
 		}
 		if c.vers >= VersionTLS12 {
 			certReq.hasSignatureAndHash = true
-			certReq.signatureAndHashes = supportedClientCertSignatureAlgorithms
+			certReq.signatureAndHashes = supportedSignatureAlgorithms
 		}
 
 		// An empty list of certificateAuthorities signals to
@@ -444,6 +453,13 @@ func (hs *serverHandshakeState) doFullHandshake() error {
 	}
 	hs.finishedHash.Write(ckx.marshal())
 
+	preMasterSecret, err := keyAgreement.processClientKeyExchange(config, hs.cert, ckx, c.vers)
+	if err != nil {
+		c.sendAlert(alertHandshakeFailure)
+		return err
+	}
+	hs.masterSecret = masterFromPreMasterSecret(c.vers, hs.suite, preMasterSecret, hs.clientHello.random, hs.hello.random)
+
 	// If we received a client cert in response to our certificate request message,
 	// the client will send us a certificateVerifyMsg immediately after the
 	// clientKeyExchangeMsg.  This message is a digest of all preceding
@@ -461,8 +477,31 @@ func (hs *serverHandshakeState) doFullHandshake() error {
 			return unexpectedMessageError(certVerify, msg)
 		}
 
+		// Determine the signature type.
+		var signatureAndHash signatureAndHash
+		if certVerify.hasSignatureAndHash {
+			signatureAndHash = certVerify.signatureAndHash
+			if !isSupportedSignatureAndHash(signatureAndHash, supportedSignatureAlgorithms) {
+				return errors.New("tls: unsupported hash function for client certificate")
+			}
+		} else {
+			// Before TLS 1.2 the signature algorithm was implicit
+			// from the key type, and only one hash per signature
+			// algorithm was possible. Leave the hash as zero.
+			switch pub.(type) {
+			case *ecdsa.PublicKey:
+				signatureAndHash.signature = signatureECDSA
+			case *rsa.PublicKey:
+				signatureAndHash.signature = signatureRSA
+			}
+		}
+
 		switch key := pub.(type) {
 		case *ecdsa.PublicKey:
+			if signatureAndHash.signature != signatureECDSA {
+				err = errors.New("bad signature type for client's ECDSA certificate")
+				break
+			}
 			ecdsaSig := new(ecdsaSignature)
 			if _, err = asn1.Unmarshal(certVerify.signature, ecdsaSig); err != nil {
 				break
@@ -471,28 +510,34 @@ func (hs *serverHandshakeState) doFullHandshake() error {
 				err = errors.New("ECDSA signature contained zero or negative values")
 				break
 			}
-			digest, _, _ := hs.finishedHash.hashForClientCertificate(signatureECDSA)
+			var digest []byte
+			if digest, _, err = hs.finishedHash.hashForClientCertificate(signatureAndHash, hs.masterSecret); err != nil {
+				break
+			}
 			if !ecdsa.Verify(key, digest, ecdsaSig.R, ecdsaSig.S) {
 				err = errors.New("ECDSA verification failure")
-				break
 			}
 		case *rsa.PublicKey:
-			digest, hashFunc, _ := hs.finishedHash.hashForClientCertificate(signatureRSA)
+			if signatureAndHash.signature != signatureRSA {
+				err = errors.New("bad signature type for client's RSA certificate")
+				break
+			}
+			var digest []byte
+			var hashFunc crypto.Hash
+			if digest, hashFunc, err = hs.finishedHash.hashForClientCertificate(signatureAndHash, hs.masterSecret); err != nil {
+				break
+			}
 			err = rsa.VerifyPKCS1v15(key, hashFunc, digest, certVerify.signature)
 		}
 		if err != nil {
 			c.sendAlert(alertBadCertificate)
-			return errors.New("could not validate signature of connection nonces: " + err.Error())
+			return errors.New("tls: could not validate signature of connection nonces: " + err.Error())
 		}
 
 		hs.finishedHash.Write(certVerify.marshal())
 	}
-	preMasterSecret, err := keyAgreement.processClientKeyExchange(config, hs.cert, ckx, c.vers)
-	if err != nil {
-		c.sendAlert(alertHandshakeFailure)
-		return err
-	}
-	hs.masterSecret = masterFromPreMasterSecret(c.vers, hs.suite.tls12Hash, preMasterSecret, hs.clientHello.random, hs.hello.random)
+
+	hs.finishedHash.discardHandshakeBuffer()
 
 	return nil
 }
@@ -501,7 +546,7 @@ func (hs *serverHandshakeState) establishKeys() error {
 	c := hs.c
 
 	clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV :=
-		keysFromMasterSecret(c.vers, hs.suite.tls12Hash, hs.masterSecret, hs.clientHello.random, hs.hello.random, hs.suite.macLen, hs.suite.keyLen, hs.suite.ivLen)
+		keysFromMasterSecret(c.vers, hs.suite, hs.masterSecret, hs.clientHello.random, hs.hello.random, hs.suite.macLen, hs.suite.keyLen, hs.suite.ivLen)
 
 	var clientCipher, serverCipher interface{}
 	var clientHash, serverHash macFunction

src/crypto/tls/key_agreement.go

@@ -11,7 +11,6 @@ import (
 	"crypto/md5"
 	"crypto/rsa"
 	"crypto/sha1"
-	"crypto/sha256"
 	"crypto/x509"
 	"encoding/asn1"
 	"errors"
@@ -108,30 +107,26 @@ func md5SHA1Hash(slices [][]byte) []byte {
 	return md5sha1
 }
 
-// sha256Hash implements TLS 1.2's hash function.
-func sha256Hash(slices [][]byte) []byte {
-	h := sha256.New()
-	for _, slice := range slices {
-		h.Write(slice)
-	}
-	return h.Sum(nil)
-}
-
 // hashForServerKeyExchange hashes the given slices and returns their digest
-// and the identifier of the hash function used. The hashFunc argument is only
-// used for >= TLS 1.2 and precisely identifies the hash function to use.
-func hashForServerKeyExchange(sigType, hashFunc uint8, version uint16, slices ...[]byte) ([]byte, crypto.Hash, error) {
+// and the identifier of the hash function used. The sigAndHash argument is
+// only used for >= TLS 1.2 and precisely identifies the hash function to use.
+func hashForServerKeyExchange(sigAndHash signatureAndHash, version uint16, slices ...[]byte) ([]byte, crypto.Hash, error) {
 	if version >= VersionTLS12 {
-		switch hashFunc {
-		case hashSHA256:
-			return sha256Hash(slices), crypto.SHA256, nil
-		case hashSHA1:
-			return sha1Hash(slices), crypto.SHA1, nil
-		default:
-			return nil, crypto.Hash(0), errors.New("tls: unknown hash function used by peer")
+		if !isSupportedSignatureAndHash(sigAndHash, supportedSignatureAlgorithms) {
+			return nil, crypto.Hash(0), errors.New("tls: unsupported hash function used by peer")
 		}
+		hashFunc, err := lookupTLSHash(sigAndHash.hash)
+		if err != nil {
+			return nil, crypto.Hash(0), err
+		}
+		h := hashFunc.New()
+		for _, slice := range slices {
+			h.Write(slice)
+		}
+		digest := h.Sum(nil)
+		return digest, hashFunc, nil
 	}
-	if sigType == signatureECDSA {
+	if sigAndHash.signature == signatureECDSA {
 		return sha1Hash(slices), crypto.SHA1, nil
 	}
 	return md5SHA1Hash(slices), crypto.MD5SHA1, nil
@@ -140,20 +135,19 @@ func hashForServerKeyExchange(sigType, hashFunc uint8, version uint16, slices ..
 // pickTLS12HashForSignature returns a TLS 1.2 hash identifier for signing a
 // ServerKeyExchange given the signature type being used and the client's
 // advertised list of supported signature and hash combinations.
-func pickTLS12HashForSignature(sigType uint8, clientSignatureAndHashes []signatureAndHash) (uint8, error) {
-	if len(clientSignatureAndHashes) == 0 {
+func pickTLS12HashForSignature(sigType uint8, clientList []signatureAndHash) (uint8, error) {
+	if len(clientList) == 0 {
 		// If the client didn't specify any signature_algorithms
 		// extension then we can assume that it supports SHA1. See
 		// http://tools.ietf.org/html/rfc5246#section-7.4.1.4.1
 		return hashSHA1, nil
 	}
 
-	for _, sigAndHash := range clientSignatureAndHashes {
+	for _, sigAndHash := range clientList {
 		if sigAndHash.signature != sigType {
 			continue
 		}
-		switch sigAndHash.hash {
-		case hashSHA1, hashSHA256:
+		if isSupportedSignatureAndHash(sigAndHash, supportedSignatureAlgorithms) {
 			return sigAndHash.hash, nil
 		}
 	}
@@ -226,14 +220,15 @@ NextCandidate:
 	serverECDHParams[3] = byte(len(ecdhePublic))
 	copy(serverECDHParams[4:], ecdhePublic)
 
-	var tls12HashId uint8
+	sigAndHash := signatureAndHash{signature: ka.sigType}
+
 	if ka.version >= VersionTLS12 {
-		if tls12HashId, err = pickTLS12HashForSignature(ka.sigType, clientHello.signatureAndHashes); err != nil {
+		if sigAndHash.hash, err = pickTLS12HashForSignature(ka.sigType, clientHello.signatureAndHashes); err != nil {
 			return nil, err
 		}
 	}
 
-	digest, hashFunc, err := hashForServerKeyExchange(ka.sigType, tls12HashId, ka.version, clientHello.random, hello.random, serverECDHParams)
+	digest, hashFunc, err := hashForServerKeyExchange(sigAndHash, ka.version, clientHello.random, hello.random, serverECDHParams)
 	if err != nil {
 		return nil, err
 	}
@@ -271,8 +266,8 @@ NextCandidate:
 	copy(skx.key, serverECDHParams)
 	k := skx.key[len(serverECDHParams):]
 	if ka.version >= VersionTLS12 {
-		k[0] = tls12HashId
-		k[1] = ka.sigType
+		k[0] = sigAndHash.hash
+		k[1] = sigAndHash.signature
 		k = k[2:]
 	}
 	k[0] = byte(len(sig) >> 8)
@@ -333,15 +328,14 @@ func (ka *ecdheKeyAgreement) processServerKeyExchange(config *Config, clientHell
 		return errServerKeyExchange
 	}
 
-	var tls12HashId uint8
+	sigAndHash := signatureAndHash{signature: ka.sigType}
 	if ka.version >= VersionTLS12 {
 		// handle SignatureAndHashAlgorithm
-		var sigAndHash []uint8
-		sigAndHash, sig = sig[:2], sig[2:]
-		if sigAndHash[1] != ka.sigType {
+		sigAndHash = signatureAndHash{hash: sig[0], signature: sig[1]}
+		if sigAndHash.signature != ka.sigType {
 			return errServerKeyExchange
 		}
-		tls12HashId = sigAndHash[0]
+		sig = sig[2:]
 		if len(sig) < 2 {
 			return errServerKeyExchange
 		}
@@ -352,7 +346,7 @@ func (ka *ecdheKeyAgreement) processServerKeyExchange(config *Config, clientHell
 	}
 	sig = sig[2:]
 
-	digest, hashFunc, err := hashForServerKeyExchange(ka.sigType, tls12HashId, ka.version, clientHello.random, serverHello.random, serverECDHParams)
+	digest, hashFunc, err := hashForServerKeyExchange(sigAndHash, ka.version, clientHello.random, serverHello.random, serverECDHParams)
 	if err != nil {
 		return err
 	}

src/crypto/tls/prf_test.go

@@ -5,7 +5,6 @@
 package tls
 
 import (
-	"crypto"
 	"encoding/hex"
 	"testing"
 )
@@ -36,7 +35,7 @@ func TestSplitPreMasterSecret(t *testing.T) {
 
 type testKeysFromTest struct {
 	version                    uint16
-	hash                       crypto.Hash
+	suite                      *cipherSuite
 	preMasterSecret            string
 	clientRandom, serverRandom string
 	masterSecret               string
@@ -51,13 +50,13 @@ func TestKeysFromPreMasterSecret(t *testing.T) {
 		clientRandom, _ := hex.DecodeString(test.clientRandom)
 		serverRandom, _ := hex.DecodeString(test.serverRandom)
 
-		masterSecret := masterFromPreMasterSecret(test.version, test.hash, in, clientRandom, serverRandom)
+		masterSecret := masterFromPreMasterSecret(test.version, test.suite, in, clientRandom, serverRandom)
 		if s := hex.EncodeToString(masterSecret); s != test.masterSecret {
 			t.Errorf("#%d: bad master secret %s, want %s", i, s, test.masterSecret)
 			continue
 		}
 
-		clientMAC, serverMAC, clientKey, serverKey, _, _ := keysFromMasterSecret(test.version, test.hash, masterSecret, clientRandom, serverRandom, test.macLen, test.keyLen, 0)
+		clientMAC, serverMAC, clientKey, serverKey, _, _ := keysFromMasterSecret(test.version, test.suite, masterSecret, clientRandom, serverRandom, test.macLen, test.keyLen, 0)
 		clientMACString := hex.EncodeToString(clientMAC)
 		serverMACString := hex.EncodeToString(serverMAC)
 		clientKeyString := hex.EncodeToString(clientKey)
@@ -71,11 +70,20 @@ func TestKeysFromPreMasterSecret(t *testing.T) {
 	}
 }
 
+func cipherSuiteById(id uint16) *cipherSuite {
+	for _, cipherSuite := range cipherSuites {
+		if cipherSuite.id == id {
+			return cipherSuite
+		}
+	}
+	panic("ciphersuite not found")
+}
+
 // These test vectors were generated from GnuTLS using `gnutls-cli --insecure -d 9 `
 var testKeysFromTests = []testKeysFromTest{
 	{
 		VersionTLS10,
-		crypto.SHA1,
+		cipherSuiteById(TLS_RSA_WITH_RC4_128_SHA),
 		"0302cac83ad4b1db3b9ab49ad05957de2a504a634a386fc600889321e1a971f57479466830ac3e6f468e87f5385fa0c5",
 		"4ae66303755184a3917fcb44880605fcc53baa01912b22ed94473fc69cebd558",
 		"4ae663020ec16e6bb5130be918cfcafd4d765979a3136a5d50c593446e4e44db",
@@ -89,7 +97,7 @@ var testKeysFromTests = []testKeysFromTest{
 	},
 	{
 		VersionTLS10,
-		crypto.SHA1,
+		cipherSuiteById(TLS_RSA_WITH_RC4_128_SHA),
 		"03023f7527316bc12cbcd69e4b9e8275d62c028f27e65c745cfcddc7ce01bd3570a111378b63848127f1c36e5f9e4890",
 		"4ae66364b5ea56b20ce4e25555aed2d7e67f42788dd03f3fee4adae0459ab106",
 		"4ae66363ab815cbf6a248b87d6b556184e945e9b97fbdf247858b0bdafacfa1c",
@@ -103,7 +111,7 @@ var testKeysFromTests = []testKeysFromTest{
 	},
 	{
 		VersionTLS10,
-		crypto.SHA1,
+		cipherSuiteById(TLS_RSA_WITH_RC4_128_SHA),
 		"832d515f1d61eebb2be56ba0ef79879efb9b527504abb386fb4310ed5d0e3b1f220d3bb6b455033a2773e6d8bdf951d278a187482b400d45deb88a5d5a6bb7d6a7a1decc04eb9ef0642876cd4a82d374d3b6ff35f0351dc5d411104de431375355addc39bfb1f6329fb163b0bc298d658338930d07d313cd980a7e3d9196cac1",
 		"4ae663b2ee389c0de147c509d8f18f5052afc4aaf9699efe8cb05ece883d3a5e",
 		"4ae664d503fd4cff50cfc1fb8fc606580f87b0fcdac9554ba0e01d785bdf278e",
@@ -117,7 +125,7 @@ var testKeysFromTests = []testKeysFromTest{
 	},
 	{
 		VersionSSL30,
-		crypto.SHA1,
+		cipherSuiteById(TLS_RSA_WITH_RC4_128_SHA),
 		"832d515f1d61eebb2be56ba0ef79879efb9b527504abb386fb4310ed5d0e3b1f220d3bb6b455033a2773e6d8bdf951d278a187482b400d45deb88a5d5a6bb7d6a7a1decc04eb9ef0642876cd4a82d374d3b6ff35f0351dc5d411104de431375355addc39bfb1f6329fb163b0bc298d658338930d07d313cd980a7e3d9196cac1",
 		"4ae663b2ee389c0de147c509d8f18f5052afc4aaf9699efe8cb05ece883d3a5e",
 		"4ae664d503fd4cff50cfc1fb8fc606580f87b0fcdac9554ba0e01d785bdf278e",

src/crypto/tls/testdata/Client-TLSv12-ClientCert-RSA-AES256-GCM-SHA384

@@ -9,11 +9,11 @@
 00000070  08 04 01 04 03 02 01 02  03 ff 01 00 01 00 00 12  |................|
 00000080  00 00                                             |..|
 >>> Flow 2 (server to client)
-00000000  16 03 03 00 59 02 00 00  55 03 03 45 6f 12 3b 7d  |....Y...U..Eo.;}|
-00000010  30 71 fe ad ab 43 21 b1  68 78 42 2e cb b9 44 c9  |0q...C!.hxB...D.|
-00000020  93 0a f3 4a dc f6 b1 a1  fe e3 22 20 1b 24 38 d4  |...J......" .$8.|
-00000030  5c 84 2e c7 63 c1 a4 84  ca b6 2a 6c b3 90 04 9e  |\...c.....*l....|
-00000040  7e a6 60 d7 1d 76 26 2f  68 12 59 a3 c0 30 00 00  |~.`..v&/h.Y..0..|
+00000000  16 03 03 00 59 02 00 00  55 03 03 c1 99 f4 77 ba  |....Y...U.....w.|
+00000010  f5 46 ef 26 6d 0d e2 57  6f 04 28 01 4e 69 d8 e0  |.F.&m..Wo.(.Ni..|
+00000020  2f 70 03 fe 77 b9 d1 7b  fc 49 ed 20 e2 0f 35 19  |/p..w..{.I. ..5.|
+00000030  ae 5a 66 04 be cc 60 d3  4f 6d ce b2 25 7f 25 24  |.Zf...`.Om..%.%$|
+00000040  31 23 d8 40 bf 78 77 4d  fa 11 22 3d c0 30 00 00  |1#.@.xwM.."=.0..|
 00000050  0d ff 01 00 01 00 00 0b  00 04 03 00 01 02 16 03  |................|
 00000060  03 02 be 0b 00 02 ba 00  02 b7 00 02 b4 30 82 02  |.............0..|
 00000070  b0 30 82 02 19 a0 03 02  01 02 02 09 00 85 b0 bb  |.0..............|
@@ -59,20 +59,20 @@
 000002f0  5f 33 c4 b6 d8 c9 75 90  96 8c 0f 52 98 b5 cd 98  |_3....u....R....|
 00000300  1f 89 20 5f f2 a0 1c a3  1b 96 94 dd a9 fd 57 e9  |.. _..........W.|
 00000310  70 e8 26 6d 71 99 9b 26  6e 38 50 29 6c 90 a7 bd  |p.&mq..&n8P)l...|
-00000320  d9 16 03 03 00 cd 0c 00  00 c9 03 00 17 41 04 a9  |.............A..|
-00000330  2e 21 28 57 be bc 41 fd  5b a8 fa e2 d9 9d d5 47  |.!(W..A.[......G|
-00000340  08 f2 68 6c 30 3f da 1c  be 40 71 7f 1d 45 a6 24  |..hl0?...@q..E.$|
-00000350  73 42 86 16 f8 16 3b 12  87 90 19 dd 03 3a 9a 45  |sB....;......:.E|
-00000360  ac ad ce 9f fc 22 8d 1f  e7 3e b2 ba 62 29 90 04  |....."...>..b)..|
-00000370  01 00 80 a0 41 e8 bf 28  94 15 fa 7b 2c aa 42 08  |....A..(...{,.B.|
-00000380  e8 e0 20 5e e0 9b 86 92  c7 f4 78 ce 9a 72 49 19  |.. ^......x..rI.|
-00000390  45 cb ed 4f 23 11 3d a2  9a 9e f3 80 47 d3 16 96  |E..O#.=.....G...|
-000003a0  ea 91 8d 62 91 5c b6 04  46 7f d5 06 d3 8f 4d f8  |...b.\..F.....M.|
-000003b0  77 ae ee c4 42 b6 44 db  cd cf 76 aa 5b 3c b0 93  |w...B.D...v.[<..|
-000003c0  6d 2d 51 53 f8 f4 c5 3e  ba 9c 8f 35 95 7c 87 33  |m-QS...>...5.|.3|
-000003d0  95 0b 69 be 33 c0 a9 b7  f7 a8 de ae 1c 95 3a c1  |..i.3.........:.|
-000003e0  11 55 4e f6 82 6d 25 d7  96 e5 fd ab cc 72 58 5b  |.UN..m%......rX[|
-000003f0  6e 12 4c 16 03 03 00 2e  0d 00 00 26 03 01 02 40  |n.L........&...@|
+00000320  d9 16 03 03 00 cd 0c 00  00 c9 03 00 17 41 04 2b  |.............A.+|
+00000330  31 48 64 07 93 c0 be 1d  68 24 fc 3a e9 ab fa 89  |1Hd.....h$.:....|
+00000340  5f 30 31 4f 39 bf c5 a4  90 40 2f c1 f3 83 a6 2a  |_01O9....@/....*|
+00000350  00 aa d5 d3 4e 8b ac 3f  4f d6 a2 e5 e6 3b a7 75  |....N..?O....;.u|
+00000360  75 6d 9a de fa 86 ba b8  e5 c0 64 a0 a6 24 8e 04  |um........d..$..|
+00000370  01 00 80 0b 10 7f 53 50  56 f1 0d 66 42 b3 6a ab  |......SPV..fB.j.|
+00000380  8b 47 e5 c2 95 01 3b 1d  e6 00 43 3e 5e 1e 15 27  |.G....;...C>^..'|
+00000390  9c cb eb 71 8a 57 50 29  5d 46 5d a6 b1 66 13 a6  |...q.WP)]F]..f..|
+000003a0  59 0a 0d 8b a1 6f 8b 56  fd 6e 42 df 11 16 00 3c  |Y....o.V.nB....<|
+000003b0  e7 d4 10 6d 03 63 47 25  f5 fa 5d ae b9 67 fd 06  |...m.cG%..]..g..|
+000003c0  e0 c3 8d c3 62 d4 72 18  0b eb 8a c2 3e 40 35 fc  |....b.r.....>@5.|
+000003d0  ec 6f e1 52 95 4f b8 52  4c 8e 97 67 bc 63 9a 37  |.o.R.O.RL..g.c.7|
+000003e0  df 89 2b ae 42 88 b6 f7  5b 31 84 47 44 e2 d8 c2  |..+.B...[1.GD...|
+000003f0  79 a8 b0 16 03 03 00 2e  0d 00 00 26 03 01 02 40  |y..........&...@|
 00000400  00 1e 06 01 06 02 06 03  05 01 05 02 05 03 04 01  |................|
 00000410  04 02 04 03 03 01 03 02  03 03 02 01 02 02 02 03  |................|
 00000420  00 00 0e 00 00 00                                 |......|
@@ -114,26 +114,26 @@
 00000220  a7 24 20 3e b2 56 1c ce  97 28 5e f8 2b 2d 4f 9e  |.$ >.V...(^.+-O.|
 00000230  f1 07 9f 6c 4b 5b 83 56  e2 32 42 e9 58 b6 d7 49  |...lK[.V.2B.X..I|
 00000240  a6 b5 68 1a 41 03 56 6b  dc 5a 89 16 03 03 00 88  |..h.A.Vk.Z......|
-00000250  0f 00 00 84 05 01 00 80  38 ca f2 b9 60 19 01 9c  |........8...`...|
-00000260  ce 24 b2 10 54 62 0f a3  03 7a af 0d 64 aa e9 c9  |.$..Tb...z..d...|
-00000270  d5 47 40 ec a6 44 b3 5a  97 73 2c e8 2b 17 e9 fb  |.G@..D.Z.s,.+...|
-00000280  2b 87 4b cc 80 ee 8a 88  35 c2 4f 2f e7 f0 1e c7  |+.K.....5.O/....|
-00000290  c6 40 6b f8 c5 71 83 2b  c0 8e 41 62 3f 3a 80 96  |.@k..q.+..Ab?:..|
-000002a0  71 a5 25 50 d3 4e 01 86  ff 1f d3 a0 a8 23 ef 80  |q.%P.N.......#..|
-000002b0  3a 79 77 d6 88 5f 70 a2  98 7a 0a 71 1e 9b 81 5d  |:yw.._p..z.q...]|
-000002c0  14 61 ac 2f 96 22 49 18  57 47 42 cf 2d 6f c3 8b  |.a./."I.WGB.-o..|
-000002d0  95 24 24 87 75 4e 52 28  14 03 03 00 01 01 16 03  |.$$.uNR(........|
-000002e0  03 00 28 00 00 00 00 00  00 00 00 4b 1b ec 28 3a  |..(........K..(:|
-000002f0  02 86 9e 52 29 d1 73 ce  60 eb 80 92 0a 1a bc 07  |...R).s.`.......|
-00000300  14 15 98 1e f7 98 d1 28  eb b7 43                 |.......(..C|
+00000250  0f 00 00 84 04 01 00 80  0a 86 16 61 b0 61 19 af  |...........a.a..|
+00000260  0e 42 fc ec 44 c2 2b dd  27 cc 9a ee d1 a8 64 7c  |.B..D.+.'.....d||
+00000270  ac 69 55 22 3b b2 ba 56  c0 22 53 af 11 be cf f0  |.iU";..V."S.....|
+00000280  90 d1 0e 72 51 d0 f2 4e  cd e0 d2 d6 a0 2f 91 46  |...rQ..N...../.F|
+00000290  fa bd 97 b5 a6 ef 66 2e  5e 15 e2 89 df b0 ea 0e  |......f.^.......|
+000002a0  67 c4 8c 7e a1 4f 9a 00  dc 32 f9 d1 cd 72 ea 1f  |g..~.O...2...r..|
+000002b0  c6 6a 20 54 a2 0f e8 32  50 4e f6 b6 79 70 4c bb  |.j T...2PN..ypL.|
+000002c0  68 8f a8 5a 46 49 a6 54  b6 83 53 df 5f 2b 00 cb  |h..ZFI.T..S._+..|
+000002d0  09 36 86 f1 21 6b bb 98  14 03 03 00 01 01 16 03  |.6..!k..........|
+000002e0  03 00 28 00 00 00 00 00  00 00 00 af 07 a0 f1 0b  |..(.............|
+000002f0  cb 36 97 2c 38 96 e4 02  7c 4d 66 db d0 72 2c 00  |.6.,8...|Mf..r,.|
+00000300  2d ea 21 0a 55 7e 98 9d  65 9a 18                 |-.!.U~..e..|
 >>> Flow 4 (server to client)
-00000000  14 03 03 00 01 01 16 03  03 00 28 c3 0d 76 f6 6c  |..........(..v.l|
-00000010  2f 07 ca 24 51 2d 2b f3  92 72 82 49 79 70 a8 e9  |/..$Q-+..r.Iyp..|
-00000020  38 99 cf 1b ff 6c 7a 83  7c b0 3b f6 a5 f6 21 db  |8....lz.|.;...!.|
-00000030  56 1e 7c                                          |V.||
+00000000  14 03 03 00 01 01 16 03  03 00 28 27 8b bb 41 ea  |..........('..A.|
+00000010  84 0b 2b d3 d8 1b 13 7c  7c 9d fd 8d 2d 8e ed 2b  |..+....||...-..+|
+00000020  1f 32 d5 8d 61 e1 bd 7a  74 59 51 a9 b9 85 6f ae  |.2..a..ztYQ...o.|
+00000030  34 1f b1                                          |4..|
 >>> Flow 5 (client to server)
-00000000  17 03 03 00 1e 00 00 00  00 00 00 00 01 00 9f 31  |...............1|
-00000010  ad 88 20 ee 78 04 8c 11  dc dd cb 50 f6 8b d7 fb  |.. .x......P....|
-00000020  2e 22 c2 15 03 03 00 1a  00 00 00 00 00 00 00 02  |."..............|
-00000030  e5 ab e8 1a 4e 58 d7 b1  eb 61 10 a8 5a be f5 2e  |....NX...a..Z...|
-00000040  f5 ae                                             |..|
+00000000  17 03 03 00 1e 00 00 00  00 00 00 00 01 0c f2 76  |...............v|
+00000010  e3 1c 31 7e bd 51 b4 4a  a8 82 d1 b6 64 51 5f 17  |..1~.Q.J....dQ_.|
+00000020  fc 28 5d 15 03 03 00 1a  00 00 00 00 00 00 00 02  |.(].............|
+00000030  14 1c ec a4 e3 2f 16 d9  22 94 ad be 2a 82 0a 68  |...../.."...*..h|
+00000040  31 d4                                             |1.|

src/crypto/tls/testdata/Server-TLSv12-ClientAuthRequestedAndECDSAGiven

 >>> Flow 1 (client to server)
-00000000  16 03 01 00 5c 01 00 00  58 03 03 52 cc 57 59 65  |....\...X..R.WYe|
-00000010  ae b3 ec a4 7a 05 f7 ec  39 22 7d 8c 91 96 6b e0  |....z...9"}...k.|
-00000020  69 81 ff 88 28 17 60 ac  94 19 ff 00 00 04 00 05  |i...(.`.........|
-00000030  00 ff 01 00 00 2b 00 0d  00 22 00 20 06 01 06 02  |.....+...". ....|
-00000040  06 03 05 01 05 02 05 03  04 01 04 02 04 03 03 01  |................|
-00000050  03 02 03 03 02 01 02 02  02 03 01 01 00 0f 00 01  |................|
-00000060  01                                                |.|
+00000000  16 03 01 00 5b 01 00 00  57 03 03 3b 02 c7 94 b7  |....[...W..;....|
+00000010  61 d9 c9 d4 1f 4e 9a a0  73 77 d7 6b 4f 42 af 97  |a....N..sw.kOB..|
+00000020  3c 12 f8 10 38 c7 3d 56  11 a3 09 00 00 04 00 05  |<...8.=V........|
+00000030  00 ff 02 01 00 00 29 00  0d 00 20 00 1e 06 01 06  |......)... .....|
+00000040  02 06 03 05 01 05 02 05  03 04 01 04 02 04 03 03  |................|
+00000050  01 03 02 03 03 02 01 02  02 02 03 00 0f 00 01 01  |................|
 >>> Flow 2 (server to client)
 00000000  16 03 03 00 31 02 00 00  2d 03 03 00 00 00 00 00  |....1...-.......|
 00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
@@ -54,9 +53,9 @@
 000002c0  50 56 5c d5 82 5a 2d 5a  5f 33 c4 b6 d8 c9 75 90  |PV\..Z-Z_3....u.|
 000002d0  96 8c 0f 52 98 b5 cd 98  1f 89 20 5f f2 a0 1c a3  |...R...... _....|
 000002e0  1b 96 94 dd a9 fd 57 e9  70 e8 26 6d 71 99 9b 26  |......W.p.&mq..&|
-000002f0  6e 38 50 29 6c 90 a7 bd  d9 16 03 03 00 0f 0d 00  |n8P)l...........|
-00000300  00 0b 02 01 40 00 04 04  01 04 03 00 00 16 03 03  |....@...........|
-00000310  00 04 0e 00 00 00                                 |......|
+000002f0  6e 38 50 29 6c 90 a7 bd  d9 16 03 03 00 13 0d 00  |n8P)l...........|
+00000300  00 0f 02 01 40 00 08 04  01 04 03 02 01 02 03 00  |....@...........|
+00000310  00 16 03 03 00 04 0e 00  00 00                    |..........|
 >>> Flow 3 (client to server)
 00000000  16 03 03 02 0a 0b 00 02  06 00 02 03 00 02 00 30  |...............0|
 00000010  82 01 fc 30 82 01 5e 02  09 00 9a 30 84 6c 26 35  |...0..^....0.l&5|
@@ -91,32 +90,33 @@
 000001e0  be e8 91 b3 da 1a f5 5d  a3 23 f5 26 8b 45 70 8d  |.......].#.&.Ep.|
 000001f0  65 62 9b 7e 01 99 3d 18  f6 10 9a 38 61 9b 2e 57  |eb.~..=....8a..W|
 00000200  e4 fa cc b1 8a ce e2 23  a0 87 f0 e1 67 51 eb 16  |.......#....gQ..|
-00000210  03 03 00 86 10 00 00 82  00 80 47 5a 2f b8 78 46  |..........GZ/.xF|
-00000220  9f 3c fc ab 8b 35 c9 77  da c3 96 78 31 7c 2b 4f  |.<...5.w...x1|+O|
-00000230  56 be 0f 33 bd 17 bc 1c  86 5a ae b3 0f 8b 18 2f  |V..3.....Z...../|
-00000240  48 0d e0 0a 20 d3 53 96  88 d2 8a 7d b6 58 13 44  |H... .S....}.X.D|
-00000250  a5 e8 19 6d 02 df a6 1b  79 c5 54 c2 ef 4d 41 4f  |...m....y.T..MAO|
-00000260  04 1c eb 37 55 b7 2b f4  7c 6d 37 9c f1 89 a0 2c  |...7U.+.|m7....,|
-00000270  0f ba 10 09 e4 a1 ee 0a  7e 9a fd 2c 32 63 1c 55  |........~..,2c.U|
-00000280  85 38 de d0 7b 5f 46 03  1f cc 4d 69 51 97 d8 d7  |.8..{_F...MiQ...|
-00000290  88 6f ba 43 04 b0 42 09  61 5e 16 03 03 00 92 0f  |.o.C..B.a^......|
-000002a0  00 00 8e 04 03 00 8a 30  81 87 02 41 14 3d 4c 71  |.......0...A.=Lq|
-000002b0  c2 32 4a 20 ee b7 69 17  55 e8 99 55 11 76 51 7a  |.2J ..i.U..U.vQz|
-000002c0  74 55 e7 e8 c3 3b b3 70  db 1c 8e f6 8a d4 99 40  |tU...;.p.......@|
-000002d0  6e da 04 fd 7a 47 41 d6  ae c0 63 ad fd 91 a8 58  |n...zGA...c....X|
-000002e0  24 b9 ac 2f 7a 4c bf 5b  24 12 cb 3a f3 02 42 00  |$../zL.[$..:..B.|
-000002f0  90 f9 48 97 0e d4 33 99  09 9f 1d a8 97 16 60 82  |..H...3.......`.|
-00000300  85 cc 5a 5d 79 f7 2f 03  2a c0 b8 12 61 ac 9f 88  |..Z]y./.*...a...|
-00000310  1d 0d 9e 0a ee 28 a8 5a  e2 42 b7 94 e2 e6 0e 13  |.....(.Z.B......|
-00000320  c8 64 dc 4e d3 6b 10 d6  83 41 9c dc d4 53 c3 08  |.d.N.k...A...S..|
-00000330  19 14 03 03 00 01 01 16  03 03 00 24 ef bd e3 23  |...........$...#|
-00000340  10 23 ae 6e b5 12 eb 9c  21 78 db 36 fd bf 7f ee  |.#.n....!x.6....|
-00000350  6f c8 00 2d b6 35 cc 2f  38 73 ae a4 34 cf 0d df  |o..-.5./8s..4...|
+00000210  03 03 00 86 10 00 00 82  00 80 ba 08 cf e6 45 d3  |..............E.|
+00000220  24 3f 4a 7e 0d 68 5f ed  5d a2 0e ad fa 41 6c 71  |$?J~.h_.]....Alq|
+00000230  43 ce 20 cf 12 c2 e1 45  78 9c 00 0b 69 f5 5f b1  |C. ....Ex...i._.|
+00000240  45 48 27 32 51 44 d8 cd  3b dc 78 1b df ee 82 68  |EH'2QD..;.x....h|
+00000250  3e 1e 26 bf e5 8d 8f 0a  6c 62 a0 f0 47 65 50 8d  |>.&.....lb..GeP.|
+00000260  2c 9a 80 bb 0a 2b e4 14  25 c6 2c 86 17 67 1b e8  |,....+..%.,..g..|
+00000270  ca 89 78 79 00 a2 d8 0e  b1 02 49 28 12 a3 a1 46  |..xy......I(...F|
+00000280  bb 6c 59 bf 59 4b 5b 48  0c 24 38 ee 7f 9f fd dd  |.lY.YK[H.$8.....|
+00000290  62 07 41 0c 5a bd 29 a4  3a ef 16 03 03 00 93 0f  |b.A.Z.).:.......|
+000002a0  00 00 8f 04 03 00 8b 30  81 88 02 42 00 9d ee a7  |.......0...B....|
+000002b0  23 08 8d 08 61 7a 5c 97  0a 6b 3e 65 3f 1e d2 36  |#...az\..k>e?..6|
+000002c0  4e 25 27 96 8f 92 08 b8  da 69 f9 3d 1e 77 88 dc  |N%'......i.=.w..|
+000002d0  33 3e 5f c5 eb 40 16 ab  32 3e c6 f5 a5 9f 42 22  |3>_..@..2>....B"|
+000002e0  f6 56 86 1f e0 95 c8 83  2d 5a c9 b9 79 b2 02 42  |.V......-Z..y..B|
+000002f0  01 2d 43 06 1d 79 3b ca  84 b2 81 21 51 01 4e 3b  |.-C..y;....!Q.N;|
+00000300  9d 5a b2 c5 87 e4 ea f9  08 2e bb 28 cc 9f a6 c6  |.Z.........(....|
+00000310  f7 6a 5c 2a f0 c8 02 33  ba 56 ea bc 3b ac 97 bc  |.j\*...3.V..;...|
+00000320  4b d0 e0 19 18 14 a6 8c  d5 60 05 b3 a2 20 7f c3  |K........`... ..|
+00000330  24 f9 14 03 03 00 01 01  16 03 03 00 24 99 58 7b  |$...........$.X{|
+00000340  e7 5d 19 95 f0 8b d5 86  7d 87 19 03 98 24 3d e8  |.]......}....$=.|
+00000350  cc c0 79 58 f9 81 b8 6c  fb d6 ed a4 84 96 13 b7  |..yX...l........|
+00000360  d0                                                |.|
 >>> Flow 4 (server to client)
-00000000  14 03 03 00 01 01 16 03  03 00 24 a7 50 0f 50 b4  |..........$.P.P.|
-00000010  1c c3 4d f3 7a 64 df 65  ac 35 22 13 46 cc ec 36  |..M.zd.e.5".F..6|
-00000020  e6 d2 f3 67 94 6a 18 85  9f 4a 3c 44 a3 58 b0 17  |...g.j...J<D.X..|
-00000030  03 03 00 21 51 0a 41 8c  fd 50 e3 54 8b 6a 1f 83  |...!Q.A..P.T.j..|
-00000040  a5 37 98 e1 5b 1e ec 03  1d c7 0e 28 6d 79 3f 34  |.7..[......(my?4|
-00000050  de 1c 38 6d 7e 15 03 03  00 16 06 fc b1 7d ad 70  |..8m~........}.p|
-00000060  1a de d4 b7 b5 e7 a2 6d  1b 9a b0 31 0c cc 7b 70  |.......m...1..{p|
+00000000  14 03 03 00 01 01 16 03  03 00 24 50 c9 ae 5b 73  |..........$P..[s|
+00000010  ce 45 98 b1 88 74 25 bd  18 6c 08 aa e4 7c 39 0b  |.E...t%..l...|9.|
+00000020  d3 e9 c2 29 fe a1 fd 0e  46 80 63 0a a0 b2 55 17  |...)....F.c...U.|
+00000030  03 03 00 21 89 28 af 50  62 c3 63 39 5b 13 03 45  |...!.(.Pb.c9[..E|
+00000040  48 c9 3c 74 93 1a 01 47  ec 28 0b 7d 37 1d 15 48  |H.<t...G.(.}7..H|
+00000050  ac eb dc 62 04 15 03 03  00 16 f6 84 ba 7b 57 9d  |...b.........{W.|
+00000060  b5 c7 d4 01 cd 04 8a d3  5a c9 c0 72 61 12 3f a1  |........Z..ra.?.|

src/crypto/tls/testdata/Server-TLSv12-ClientAuthRequestedAndGiven

 >>> Flow 1 (client to server)
-00000000  16 03 01 00 5c 01 00 00  58 03 03 52 cc 57 59 6b  |....\...X..R.WYk|
-00000010  11 07 04 39 77 20 c2 b4  3f cb 0a c9 53 fe 5b 3e  |...9w ..?...S.[>|
-00000020  5f 58 2c 7e 30 69 e1 8e  6c 9d c8 00 00 04 00 05  |_X,~0i..l.......|
-00000030  00 ff 01 00 00 2b 00 0d  00 22 00 20 06 01 06 02  |.....+...". ....|
-00000040  06 03 05 01 05 02 05 03  04 01 04 02 04 03 03 01  |................|
-00000050  03 02 03 03 02 01 02 02  02 03 01 01 00 0f 00 01  |................|
-00000060  01                                                |.|
+00000000  16 03 01 00 5b 01 00 00  57 03 03 23 82 04 e6 b7  |....[...W..#....|
+00000010  a4 1e 2c 61 ae c0 cd ef  d3 2a 30 0b d7 19 88 16  |..,a.....*0.....|
+00000020  e3 af 68 6c 45 83 df f5  02 b0 43 00 00 04 00 05  |..hlE.....C.....|
+00000030  00 ff 02 01 00 00 29 00  0d 00 20 00 1e 06 01 06  |......)... .....|
+00000040  02 06 03 05 01 05 02 05  03 04 01 04 02 04 03 03  |................|
+00000050  01 03 02 03 03 02 01 02  02 02 03 00 0f 00 01 01  |................|
 >>> Flow 2 (server to client)
 00000000  16 03 03 00 31 02 00 00  2d 03 03 00 00 00 00 00  |....1...-.......|
 00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
@@ -54,9 +53,9 @@
 000002c0  50 56 5c d5 82 5a 2d 5a  5f 33 c4 b6 d8 c9 75 90  |PV\..Z-Z_3....u.|
 000002d0  96 8c 0f 52 98 b5 cd 98  1f 89 20 5f f2 a0 1c a3  |...R...... _....|
 000002e0  1b 96 94 dd a9 fd 57 e9  70 e8 26 6d 71 99 9b 26  |......W.p.&mq..&|
-000002f0  6e 38 50 29 6c 90 a7 bd  d9 16 03 03 00 0f 0d 00  |n8P)l...........|
-00000300  00 0b 02 01 40 00 04 04  01 04 03 00 00 16 03 03  |....@...........|
-00000310  00 04 0e 00 00 00                                 |......|
+000002f0  6e 38 50 29 6c 90 a7 bd  d9 16 03 03 00 13 0d 00  |n8P)l...........|
+00000300  00 0f 02 01 40 00 08 04  01 04 03 02 01 02 03 00  |....@...........|
+00000310  00 16 03 03 00 04 0e 00  00 00                    |..........|
 >>> Flow 3 (client to server)
 00000000  16 03 03 01 fb 0b 00 01  f7 00 01 f4 00 01 f1 30  |...............0|
 00000010  82 01 ed 30 82 01 58 a0  03 02 01 02 02 01 00 30  |...0..X........0|
@@ -90,32 +89,32 @@
 000001d0  8b ec ab 67 be c8 64 b0  11 50 46 58 17 6b 99 1c  |...g..d..PFX.k..|
 000001e0  d3 1d fc 06 f1 0e e5 96  a8 0c f9 78 20 b7 44 18  |...........x .D.|
 000001f0  51 8d 10 7e 4f 94 67 df  a3 4e 70 73 8e 90 91 85  |Q..~O.g..Nps....|
-00000200  16 03 03 00 86 10 00 00  82 00 80 44 89 7d aa 26  |...........D.}.&|
-00000210  30 ce 6b db 25 70 b0 1e  16 fa 5b 3a dd 4a 4b bd  |0.k.%p....[:.JK.|
-00000220  ec ee 50 9d 21 ba 52 b5  51 4f a8 65 d8 2e 41 e2  |..P.!.R.QO.e..A.|
-00000230  e1 dc f3 1a df 58 4f 87  7a d3 e1 e1 1c 13 b2 0b  |.....XO.z.......|
-00000240  b7 43 b7 92 f2 df 19 bb  79 71 e0 71 44 ab 19 2f  |.C......yq.qD../|
-00000250  37 11 ac 62 50 b6 f1 53  fe aa b4 bc 29 8e 0b 4c  |7..bP..S....)..L|
-00000260  0b 12 8d d5 84 a9 fa a9  ea 16 aa c3 0d da 32 c8  |..............2.|
-00000270  e0 4c 9f 99 f8 69 cd a8  c3 b1 76 42 67 f3 ff 15  |.L...i....vBg...|
-00000280  52 95 43 66 da 49 43 25  9d e5 eb 16 03 03 00 88  |R.Cf.IC%........|
-00000290  0f 00 00 84 04 01 00 80  01 d5 0e 1c 75 97 89 52  |............u..R|
-000002a0  1a f0 cc ef 93 6e 71 b2  b1 38 8c 50 11 f7 a3 02  |.....nq..8.P....|
-000002b0  71 c4 d5 6f 8d 01 83 06  2e ea 5a 10 8a 0d d0 fc  |q..o......Z.....|
-000002c0  b6 a2 63 af 4f 99 b5 eb  ab fd 01 c2 fb 26 fc fd  |..c.O........&..|
-000002d0  ad 2c b3 63 b3 87 a6 f5  14 ea 7d e7 fe a8 e7 7e  |.,.c......}....~|
-000002e0  20 ab b9 f6 c3 58 bd c0  f3 96 eb 83 dc 42 6c 0d  | ....X.......Bl.|
-000002f0  5e e8 09 55 c7 b8 24 05  dd e1 7c af 9f 2c 22 6c  |^..U..$...|..,"l|
-00000300  fa b8 94 13 3b f1 09 e1  38 59 fc a1 8c cb aa ca  |....;...8Y......|
-00000310  f8 e0 2a 9c 36 f9 c3 2b  14 03 03 00 01 01 16 03  |..*.6..+........|
-00000320  03 00 24 d0 12 7c cc d2  3e 37 1f f4 7d b4 c0 fc  |..$..|..>7..}...|
-00000330  19 f6 c8 ea 62 12 e0 0d  af 62 d4 69 f7 96 5a c0  |....b....b.i..Z.|
-00000340  97 d3 bb b0 a3 f7 3f                              |......?|
+00000200  16 03 03 00 86 10 00 00  82 00 80 a9 2f ef 94 68  |............/..h|
+00000210  e5 de 70 a0 f6 ef 70 e6  db 01 69 b1 0b e6 ee 21  |..p...p...i....!|
+00000220  48 e0 39 28 4d 19 61 b4  67 9d e6 a1 c5 93 49 b4  |H.9(M.a.g.....I.|
+00000230  5c ed 60 72 1a 01 aa b3  21 18 47 20 f0 0b cd e7  |\.`r....!.G ....|
+00000240  68 fa ca 35 65 86 06 42  9c 36 45 f3 36 42 17 88  |h..5e..B.6E.6B..|
+00000250  9f 0b 0b 99 35 28 d4 98  a3 86 4d 55 0b d0 2c 31  |....5(....MU..,1|
+00000260  64 d6 ce e4 50 a5 4e d6  a4 4b 9c b8 d2 4a 35 61  |d...P.N..K...J5a|
+00000270  0d f0 28 ad 96 91 59 04  5c 55 5a 0b 2d 12 a1 d1  |..(...Y.\UZ.-...|
+00000280  60 e8 55 a2 90 55 9a 55  ad 1d 05 16 03 03 00 88  |`.U..U.U........|
+00000290  0f 00 00 84 04 01 00 80  0f 8a 5c 80 aa 8e d3 c9  |..........\.....|
+000002a0  2c 97 a1 0b 0c 54 b4 66  4e 92 59 89 4e 3b 58 71  |,....T.fN.Y.N;Xq|
+000002b0  e0 d7 5a 5a 85 90 de 1e  b2 61 1b 0b f1 a2 1c d6  |..ZZ.....a......|
+000002c0  02 44 da 1e 10 fd 41 62  3f 11 13 0f 59 43 40 cb  |.D....Ab?...YC@.|
+000002d0  f4 6a e4 c9 a7 f4 20 be  d2 8c ac cb b9 24 40 51  |.j.... ......$@Q|
+000002e0  a9 83 c5 a9 34 b2 16 e2  4a 7b 0f d1 df a0 fc 15  |....4...J{......|
+000002f0  85 89 0c f7 5a bc bb c6  90 da e2 81 c3 c5 4d 58  |....Z.........MX|
+00000300  f3 04 73 8f ab 03 39 e5  88 52 bd 3a bd ca 0a 09  |..s...9..R.:....|
+00000310  23 36 68 dc b3 2b 1b 07  14 03 03 00 01 01 16 03  |#6h..+..........|
+00000320  03 00 24 64 3e ca cf ab  6e 8b 5e 2d bb b0 09 55  |..$d>...n.^-...U|
+00000330  68 c6 88 08 25 15 fc a5  6c 95 9a d8 b4 58 f9 a3  |h...%...l....X..|
+00000340  55 a0 92 c2 08 72 1c                              |U....r.|
 >>> Flow 4 (server to client)
-00000000  14 03 03 00 01 01 16 03  03 00 24 cd 20 85 1e 74  |..........$. ..t|
-00000010  18 b2 71 48 d5 10 61 c6  b0 18 26 83 c2 7f f1 b1  |..qH..a...&.....|
-00000020  2f b5 35 d0 47 a8 99 9a  9a a5 62 64 fb f9 29 17  |/.5.G.....bd..).|
-00000030  03 03 00 21 22 7b ed 61  e3 9b 6d 98 b9 23 98 e3  |...!"{.a..m..#..|
-00000040  55 11 b8 0f 7e 2b e1 c1  d4 f1 83 79 c3 f8 03 f0  |U...~+.....y....|
-00000050  02 5c 61 24 d7 15 03 03  00 16 14 2b a3 5a 56 f0  |.\a$.......+.ZV.|
-00000060  92 da d0 e6 32 91 d8 30  7a b4 d0 a2 93 f5 01 ea  |....2..0z.......|
+00000000  14 03 03 00 01 01 16 03  03 00 24 4e b8 9c fd 56  |..........$N...V|
+00000010  81 68 9d 5a 41 5c 53 f9  10 a5 d0 8e 93 79 4e 87  |.h.ZA\S......yN.|
+00000020  f8 92 09 09 0f ea 04 08  e8 14 e1 8a 0b f8 23 17  |..............#.|
+00000030  03 03 00 21 1f 22 bc 5a  ce d7 5e ca c4 d3 be f5  |...!.".Z..^.....|
+00000040  d4 f6 4e b9 aa 10 be d3  b6 a9 ad 3e f5 f6 69 fd  |..N........>..i.|
+00000050  23 a8 cd e2 4d 15 03 03  00 16 29 1d 72 73 aa 62  |#...M.....).rs.b|
+00000060  c7 ac 8b 19 8f 72 27 b2  12 ac ce 72 2c c4 47 19  |.....r'....r,.G.|

src/crypto/tls/testdata/Server-TLSv12-ClientAuthRequestedNotGiven

 >>> Flow 1 (client to server)
-00000000  16 03 01 00 5c 01 00 00  58 03 03 52 cc 57 59 1b  |....\...X..R.WY.|
-00000010  08 fe f7 8a bf 07 84 2b  60 a6 13 2d 15 13 f8 b6  |.......+`..-....|
-00000020  d4 b6 3b f2 7a 98 ff 32  a0 68 7c 00 00 04 00 05  |..;.z..2.h|.....|
-00000030  00 ff 01 00 00 2b 00 0d  00 22 00 20 06 01 06 02  |.....+...". ....|
-00000040  06 03 05 01 05 02 05 03  04 01 04 02 04 03 03 01  |................|
-00000050  03 02 03 03 02 01 02 02  02 03 01 01 00 0f 00 01  |................|
-00000060  01                                                |.|
+00000000  16 03 01 00 5b 01 00 00  57 03 03 d7 96 89 ca 52  |....[...W......R|
+00000010  d3 5b 27 58 b9 d2 4a 09  ce 09 7a 0f ee ea fc be  |.['X..J...z.....|
+00000020  04 8b 05 15 5b ab 26 52  88 72 51 00 00 04 00 05  |....[.&R.rQ.....|
+00000030  00 ff 02 01 00 00 29 00  0d 00 20 00 1e 06 01 06  |......)... .....|
+00000040  02 06 03 05 01 05 02 05  03 04 01 04 02 04 03 03  |................|
+00000050  01 03 02 03 03 02 01 02  02 02 03 00 0f 00 01 01  |................|
 >>> Flow 2 (server to client)
 00000000  16 03 03 00 31 02 00 00  2d 03 03 00 00 00 00 00  |....1...-.......|
 00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
@@ -54,28 +53,28 @@
 000002c0  50 56 5c d5 82 5a 2d 5a  5f 33 c4 b6 d8 c9 75 90  |PV\..Z-Z_3....u.|
 000002d0  96 8c 0f 52 98 b5 cd 98  1f 89 20 5f f2 a0 1c a3  |...R...... _....|
 000002e0  1b 96 94 dd a9 fd 57 e9  70 e8 26 6d 71 99 9b 26  |......W.p.&mq..&|
-000002f0  6e 38 50 29 6c 90 a7 bd  d9 16 03 03 00 0f 0d 00  |n8P)l...........|
-00000300  00 0b 02 01 40 00 04 04  01 04 03 00 00 16 03 03  |....@...........|
-00000310  00 04 0e 00 00 00                                 |......|
+000002f0  6e 38 50 29 6c 90 a7 bd  d9 16 03 03 00 13 0d 00  |n8P)l...........|
+00000300  00 0f 02 01 40 00 08 04  01 04 03 02 01 02 03 00  |....@...........|
+00000310  00 16 03 03 00 04 0e 00  00 00                    |..........|
 >>> Flow 3 (client to server)
 00000000  16 03 03 00 07 0b 00 00  03 00 00 00 16 03 03 00  |................|
-00000010  86 10 00 00 82 00 80 6b  51 48 d3 18 7d 30 e0 0c  |.......kQH..}0..|
-00000020  20 8d f3 e4 39 47 30 0e  a5 85 79 f9 8b 11 50 9e  | ...9G0...y...P.|
-00000030  81 71 5c 26 c6 bb cb aa  d5 00 d1 89 79 b1 77 2d  |.q\&........y.w-|
-00000040  eb 9b 86 7c 52 c6 f7 b7  10 b0 b6 94 22 51 b8 12  |...|R......."Q..|
-00000050  3c 09 35 8e 1b cc f4 3b  b7 b8 78 ab 89 59 41 49  |<.5....;..x..YAI|
-00000060  21 31 eb f0 f8 94 63 3d  e6 96 8f b6 63 95 05 dd  |!1....c=....c...|
-00000070  46 b3 00 8a d6 83 75 99  1b 5a 48 0a 23 b5 10 c1  |F.....u..ZH.#...|
-00000080  95 b5 bc 15 72 b5 f5 a0  62 e2 1d c0 ff d2 87 a5  |....r...b.......|
-00000090  97 5c 33 49 a7 26 35 14  03 03 00 01 01 16 03 03  |.\3I.&5.........|
-000000a0  00 24 61 38 1f 9d fb d9  65 2e 02 07 fb be f9 85  |.$a8....e.......|
-000000b0  8d 15 34 c0 d1 0e 4e 10  3c 25 60 2f ac 04 21 66  |..4...N.<%`/..!f|
-000000c0  04 9d 9a 60 31 72                                 |...`1r|
+00000010  86 10 00 00 82 00 80 2a  d6 5e 1d 41 2f 3e 28 16  |.......*.^.A/>(.|
+00000020  59 0e af 65 a4 10 24 a0  cb 7b cb c5 4d f2 5b 61  |Y..e..$..{..M.[a|
+00000030  48 b2 13 26 0c 6e 7f 8d  7a fc cf 40 7c 1f 9b ca  |H..&.n..z..@|...|
+00000040  e2 2e 62 ba e0 54 be b4  3b b4 93 20 87 e9 55 58  |..b..T..;.. ..UX|
+00000050  b7 e3 8f 16 d0 9b 92 09  c3 37 fb 90 75 0d b1 34  |.........7..u..4|
+00000060  2c 2f da 8e 91 a2 54 a8  23 82 35 06 a6 37 98 d7  |,/....T.#.5..7..|
+00000070  54 13 35 48 3c bb db 5e  02 30 5d e6 76 ac 72 bd  |T.5H<..^.0].v.r.|
+00000080  40 da 41 62 0a 6c c1 4a  bc 4d c2 e0 19 2c 0a d0  |@.Ab.l.J.M...,..|
+00000090  02 be ca 74 9d fe f0 14  03 03 00 01 01 16 03 03  |...t............|
+000000a0  00 24 69 1d 39 5e 3d 56  c4 a9 69 be 15 e3 3f 54  |.$i.9^=V..i...?T|
+000000b0  59 cf 24 b1 6b 02 cf e3  88 89 e2 61 1e 28 a2 ac  |Y.$.k......a.(..|
+000000c0  cb e0 e2 26 d7 eb                                 |...&..|
 >>> Flow 4 (server to client)
-00000000  14 03 03 00 01 01 16 03  03 00 24 fe 0e 3e 84 af  |..........$..>..|
-00000010  e5 6b 10 ed 41 9c 2b e0  ba e0 2b 53 61 36 1b 40  |.k..A.+...+Sa6.@|
-00000020  35 de 3a c7 c3 5c df 74  67 f7 05 74 84 f5 e1 17  |5.:..\.tg..t....|
-00000030  03 03 00 21 d3 8d 81 85  b7 1f 30 bd 89 33 f9 81  |...!......0..3..|
-00000040  89 f7 af d1 be b0 c1 46  e3 df 32 f6 dc 2f 4d 82  |.......F..2../M.|
-00000050  0a 84 9f 5b 03 15 03 03  00 16 13 af 37 91 82 67  |...[........7..g|
-00000060  b0 7c 5e 0e ec 8e cc 31  a0 ea a5 72 a4 2b 0b 73  |.|^....1...r.+.s|
+00000000  14 03 03 00 01 01 16 03  03 00 24 30 d5 30 a5 a9  |..........$0.0..|
+00000010  c2 4d 71 23 01 6d d2 86  fa 08 77 a0 c2 a8 06 f9  |.Mq#.m....w.....|
+00000020  76 af e2 60 cd a8 8a c9  ee 7c 47 70 02 e6 04 17  |v..`.....|Gp....|
+00000030  03 03 00 21 a8 23 bf 89  d0 ec 14 17 8b 13 1f 66  |...!.#.........f|
+00000040  83 f8 b3 6b ce 70 ba 77  ab 04 6e b5 38 76 bc 4c  |...k.p.w..n.8v.L|
+00000050  b3 a2 ed 67 9a 15 03 03  00 16 1d c3 b9 d1 e5 39  |...g...........9|
+00000060  d8 1e f8 49 46 49 6c 58  57 fc c7 07 0f 10 94 c7  |...IFIlXW.......|