Use digest indices for signature algorithms.

Don't hard code EVP_sha* etc for signature algorithms: use table
indices instead. Add SHA224 and SHA512 to tables.
Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

ssl/ssl_ciph.c

@@ -230,11 +230,13 @@ static const ssl_cipher_table ssl_cipher_table_mac[SSL_MD_NUM_IDX] = {
     {SSL_GOST12_256, NID_id_GostR3411_2012_256},  /* SSL_MD_GOST12_256_IDX 6 */
     {SSL_GOST89MAC12, NID_gost_mac_12},           /* SSL_MD_GOST89MAC12_IDX 7 */
     {SSL_GOST12_512, NID_id_GostR3411_2012_512},  /* SSL_MD_GOST12_512_IDX 8 */
-    {0, NID_md5_sha1}           /* SSL_MD_MD5_SHA1_IDX 9 */
+    {0, NID_md5_sha1},          /* SSL_MD_MD5_SHA1_IDX 9 */
+    {0, NID_sha224},            /* SSL_MD_SHA224_IDX 10 */
+    {0, NID_sha512}             /* SSL_MD_SHA512_IDX 11 */
 };
 
 static const EVP_MD *ssl_digest_methods[SSL_MD_NUM_IDX] = {
-    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
 };
 
 /* Utility function for table lookup */

ssl/ssl_locl.h

@@ -406,7 +406,9 @@
 # define SSL_MD_GOST89MAC12_IDX 7
 # define SSL_MD_GOST12_512_IDX  8
 # define SSL_MD_MD5_SHA1_IDX 9
-# define SSL_MAX_DIGEST 10
+# define SSL_MD_SHA224_IDX 10
+# define SSL_MD_SHA512_IDX 11
+# define SSL_MAX_DIGEST 12
 
 /* Bits for algorithm2 (handshake digests and other extra flags) */
 

ssl/t1_lib.c

@@ -3254,39 +3254,20 @@ int tls12_get_sigid(const EVP_PKEY *pk)
 typedef struct {
     int nid;
     int secbits;
-    const EVP_MD *(*mfunc) (void);
+    int md_idx;
     unsigned char tlsext_hash;
 } tls12_hash_info;
 
-static const EVP_MD* md_gost94()
-{
-	return EVP_get_digestbynid(NID_id_GostR3411_94);
-}
-
-static const EVP_MD* md_gost2012_256()
-{
-	return EVP_get_digestbynid(NID_id_GostR3411_2012_256);
-}
-
-static const EVP_MD* md_gost2012_512()
-{
-	return EVP_get_digestbynid(NID_id_GostR3411_2012_512);
-}
-
 static const tls12_hash_info tls12_md_info[] = {
-#ifdef OPENSSL_NO_MD5
-    {NID_md5, 64, 0, TLSEXT_hash_md5},
-#else
-    {NID_md5, 64, EVP_md5, TLSEXT_hash_md5},
-#endif
-    {NID_sha1, 80, EVP_sha1, TLSEXT_hash_sha1},
-    {NID_sha224, 112, EVP_sha224, TLSEXT_hash_sha224},
-    {NID_sha256, 128, EVP_sha256, TLSEXT_hash_sha256},
-    {NID_sha384, 192, EVP_sha384, TLSEXT_hash_sha384},
-    {NID_sha512, 256, EVP_sha512, TLSEXT_hash_sha512},
-    {NID_id_GostR3411_94,       128, md_gost94, TLSEXT_hash_gostr3411},
-    {NID_id_GostR3411_2012_256, 128, md_gost2012_256, TLSEXT_hash_gostr34112012_256},
-    {NID_id_GostR3411_2012_512, 256, md_gost2012_512, TLSEXT_hash_gostr34112012_512},
+    {NID_md5, 64, SSL_MD_MD5_IDX, TLSEXT_hash_md5},
+    {NID_sha1, 80, SSL_MD_SHA1_IDX, TLSEXT_hash_sha1},
+    {NID_sha224, 112, SSL_MD_SHA224_IDX, TLSEXT_hash_sha224},
+    {NID_sha256, 128, SSL_MD_SHA256_IDX, TLSEXT_hash_sha256},
+    {NID_sha384, 192, SSL_MD_SHA384_IDX, TLSEXT_hash_sha384},
+    {NID_sha512, 256, SSL_MD_SHA512_IDX, TLSEXT_hash_sha512},
+    {NID_id_GostR3411_94,       128, SSL_MD_GOST94_IDX, TLSEXT_hash_gostr3411},
+    {NID_id_GostR3411_2012_256, 128, SSL_MD_GOST12_256_IDX, TLSEXT_hash_gostr34112012_256},
+    {NID_id_GostR3411_2012_512, 256, SSL_MD_GOST12_512_IDX, TLSEXT_hash_gostr34112012_512},
 };
 
 static const tls12_hash_info *tls12_get_hash_info(unsigned char hash_alg)
@@ -3310,9 +3291,9 @@ const EVP_MD *tls12_get_hash(unsigned char hash_alg)
     if (hash_alg == TLSEXT_hash_md5 && FIPS_mode())
         return NULL;
     inf = tls12_get_hash_info(hash_alg);
-    if (!inf || !inf->mfunc)
+    if (!inf)
         return NULL;
-    return inf->mfunc();
+    return ssl_md(inf->md_idx);
 }
 
 static int tls12_get_pkey_idx(unsigned char sig_alg)
@@ -3374,7 +3355,7 @@ static int tls12_sigalg_allowed(SSL *s, int op, const unsigned char *ptmp)
 {
     /* See if we have an entry in the hash table and it is enabled */
     const tls12_hash_info *hinf = tls12_get_hash_info(ptmp[0]);
-    if (!hinf || !hinf->mfunc)
+    if (hinf == NULL || ssl_md(hinf->md_idx) == NULL)
         return 0;
     /* See if public key algorithm allowed */
     if (tls12_get_pkey_idx(ptmp[1]) == -1)