crypto: pkcs7 - remove md4 md5 x.509 support

Remove support for md4 md5 hash and signatures in x.509 certificate
parsers, pkcs7 signature parser, authenticode parser.

All of these are insecure or broken, and everyone has long time ago
migrated to alternative hash implementations.

Also remove md2 & md3 oids which have already didn't have support.

This is also likely the last user of md4 in the kernel, and thus
crypto/md4.c and related tests in tcrypt & testmgr can likely be
removed. Other users such as cifs smbfs ext modpost sumversions have
their own internal implementation as needed.
Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/asymmetric_keys/mscode_parser.c

@@ -75,12 +75,6 @@ int mscode_note_digest_algo(void *context, size_t hdrlen,
 
 	oid = look_up_OID(value, vlen);
 	switch (oid) {
-	case OID_md4:
-		ctx->digest_algo = "md4";
-		break;
-	case OID_md5:
-		ctx->digest_algo = "md5";
-		break;
 	case OID_sha1:
 		ctx->digest_algo = "sha1";
 		break;

crypto/asymmetric_keys/pkcs7_parser.c

@@ -227,12 +227,6 @@ int pkcs7_sig_note_digest_algo(void *context, size_t hdrlen,
 	struct pkcs7_parse_context *ctx = context;
 
 	switch (ctx->last_oid) {
-	case OID_md4:
-		ctx->sinfo->sig->hash_algo = "md4";
-		break;
-	case OID_md5:
-		ctx->sinfo->sig->hash_algo = "md5";
-		break;
 	case OID_sha1:
 		ctx->sinfo->sig->hash_algo = "sha1";
 		break;

crypto/asymmetric_keys/x509_cert_parser.c

@@ -195,15 +195,9 @@ int x509_note_sig_algo(void *context, size_t hdrlen, unsigned char tag,
 	pr_debug("PubKey Algo: %u\n", ctx->last_oid);
 
 	switch (ctx->last_oid) {
-	case OID_md2WithRSAEncryption:
-	case OID_md3WithRSAEncryption:
 	default:
 		return -ENOPKG; /* Unsupported combination */
 
-	case OID_md4WithRSAEncryption:
-		ctx->cert->sig->hash_algo = "md4";
-		goto rsa_pkcs1;
-
 	case OID_sha1WithRSAEncryption:
 		ctx->cert->sig->hash_algo = "sha1";
 		goto rsa_pkcs1;

include/linux/oid_registry.h

@@ -30,9 +30,6 @@ enum OID {
 
 	/* PKCS#1 {iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-1(1)} */
 	OID_rsaEncryption,		/* 1.2.840.113549.1.1.1 */
-	OID_md2WithRSAEncryption,	/* 1.2.840.113549.1.1.2 */
-	OID_md3WithRSAEncryption,	/* 1.2.840.113549.1.1.3 */
-	OID_md4WithRSAEncryption,	/* 1.2.840.113549.1.1.4 */
 	OID_sha1WithRSAEncryption,	/* 1.2.840.113549.1.1.5 */
 	OID_sha256WithRSAEncryption,	/* 1.2.840.113549.1.1.11 */
 	OID_sha384WithRSAEncryption,	/* 1.2.840.113549.1.1.12 */
@@ -49,11 +46,6 @@ enum OID {
 	OID_smimeCapabilites,		/* 1.2.840.113549.1.9.15 */
 	OID_smimeAuthenticatedAttrs,	/* 1.2.840.113549.1.9.16.2.11 */
 
-	/* {iso(1) member-body(2) us(840) rsadsi(113549) digestAlgorithm(2)} */
-	OID_md2,			/* 1.2.840.113549.2.2 */
-	OID_md4,			/* 1.2.840.113549.2.4 */
-	OID_md5,			/* 1.2.840.113549.2.5 */
-
 	OID_mskrb5,			/* 1.2.840.48018.1.2.2 */
 	OID_krb5,			/* 1.2.840.113554.1.2.2 */
 	OID_krb5u2u,			/* 1.2.840.113554.1.2.2.3 */