Convert tls1_process_sigalgs to CBS.

ok miod@ jsing@

1 files changed, 14 insertions, 5 deletions

diff --git a/src/lib/libssl/t1_lib.c b/src/lib/libssl/t1_lib.c
index 70823bf8e7..2481a71f84 100644
--- a/src/lib/libssl/t1_lib.c
+++ b/src/lib/libssl/t1_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: t1_lib.c,v 1.80 2015/07/19 20:32:18 doug Exp $ */
+/* $OpenBSD: t1_lib.c,v 1.81 2015/07/24 03:50:12 doug Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -2336,26 +2336,35 @@ tls12_get_hash(unsigned char hash_alg)
 int
 tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
 {
-        int i, idx;
+        int idx;
         const EVP_MD *md;
         CERT *c = s->cert;
+        CBS cbs;
 
         /* Extension ignored for inappropriate versions */
         if (!SSL_USE_SIGALGS(s))
                 return 1;
 
         /* Should never happen */
-        if (!c)
+        if (!c || dsize < 0)
                 return 0;
 
+        CBS_init(&cbs, data, dsize);
+
         c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
         c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
         c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
         c->pkeys[SSL_PKEY_ECC].digest = NULL;
         c->pkeys[SSL_PKEY_GOST01].digest = NULL;
 
-        for (i = 0; i < dsize; i += 2) {
-                unsigned char hash_alg = data[i], sig_alg = data[i + 1];
+        while (CBS_len(&cbs) > 0) {
+                uint8_t hash_alg, sig_alg;
+
+                if (!CBS_get_u8(&cbs, &hash_alg) ||
+                    !CBS_get_u8(&cbs, &sig_alg)) {
+                        /* Should never happen */
+                        return 0;
+                }
 
                 switch (sig_alg) {
                 case TLSEXT_signature_rsa: