From 63c1df098316fdd3090631b31c64c7f4a6ae7aca Mon Sep 17 00:00:00 2001
From: Matt Caswell <matt@openssl.org>
Date: Wed, 14 Dec 2016 16:50:14 +0000
Subject: [PATCH] Remove some unneeded functions

The sigalgs work has made some old lookup tables and functions redundant
so remove them.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2157)
---
 ssl/ssl_locl.h |  1 -
 ssl/t1_lib.c   | 63 +++++++++++---------------------------------------
 2 files changed, 14 insertions(+), 50 deletions(-)

diff --git a/ssl/ssl_locl.h b/ssl/ssl_locl.h
index 750219fdc1..06c1a09f52 100644
--- a/ssl/ssl_locl.h
+++ b/ssl/ssl_locl.h
@@ -2145,7 +2145,6 @@ __owur int tls_use_ticket(SSL *s);
 
 __owur int tls12_get_sigandhash(SSL *s, WPACKET *pkt, const EVP_PKEY *pk,
                                 const EVP_MD *md);
-__owur int tls12_get_sigid(const EVP_PKEY *pk);
 __owur const EVP_MD *tls12_get_hash(int hash_nid);
 void ssl_set_sig_mask(uint32_t *pmask_a, SSL *s, int op);
 
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 1b82b6e001..da5797228a 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -1287,44 +1287,6 @@ static int tls_decrypt_ticket(SSL *s, const unsigned char *etick,
     return ret;
 }
 
-/* Tables to translate from NIDs to TLS v1.2 ids */
-
-typedef struct {
-    int nid;
-    int id;
-} tls12_lookup;
-
-static const tls12_lookup tls12_md[] = {
-    {NID_md5, TLSEXT_hash_md5},
-    {NID_sha1, TLSEXT_hash_sha1},
-    {NID_sha224, TLSEXT_hash_sha224},
-    {NID_sha256, TLSEXT_hash_sha256},
-    {NID_sha384, TLSEXT_hash_sha384},
-    {NID_sha512, TLSEXT_hash_sha512},
-    {NID_id_GostR3411_94, TLSEXT_hash_gostr3411},
-    {NID_id_GostR3411_2012_256, TLSEXT_hash_gostr34112012_256},
-    {NID_id_GostR3411_2012_512, TLSEXT_hash_gostr34112012_512},
-};
-
-static const tls12_lookup tls12_sig[] = {
-    {EVP_PKEY_RSA, TLSEXT_signature_rsa},
-    {EVP_PKEY_DSA, TLSEXT_signature_dsa},
-    {EVP_PKEY_EC, TLSEXT_signature_ecdsa},
-    {NID_id_GostR3410_2001, TLSEXT_signature_gostr34102001},
-    {NID_id_GostR3410_2012_256, TLSEXT_signature_gostr34102012_256},
-    {NID_id_GostR3410_2012_512, TLSEXT_signature_gostr34102012_512}
-};
-
-static int tls12_find_id(int nid, const tls12_lookup *table, size_t tlen)
-{
-    size_t i;
-    for (i = 0; i < tlen; i++) {
-        if (table[i].nid == nid)
-            return table[i].id;
-    }
-    return -1;
-}
-
 int tls12_get_sigandhash(SSL *s, WPACKET *pkt, const EVP_PKEY *pk,
                          const EVP_MD *md)
 {
@@ -1352,11 +1314,6 @@ int tls12_get_sigandhash(SSL *s, WPACKET *pkt, const EVP_PKEY *pk,
     return 0;
 }
 
-int tls12_get_sigid(const EVP_PKEY *pk)
-{
-    return tls12_find_id(EVP_PKEY_id(pk), tls12_sig, OSSL_NELEM(tls12_sig));
-}
-
 typedef struct {
     int nid;
     int secbits;
@@ -1829,8 +1786,8 @@ int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
 int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
 {
     unsigned int *sigalgs, *sptr;
-    int rhash, rsign;
     size_t i;
+
     if (salglen & 1)
         return 0;
     sigalgs = OPENSSL_malloc(salglen * sizeof(*sigalgs));
@@ -1841,13 +1798,21 @@ int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
      * RSA-PKCS1. For now we only allow setting of RSA-PKCS1
      */
     for (i = 0, sptr = sigalgs; i < salglen; i += 2) {
-        rhash = tls12_find_id(*psig_nids++, tls12_md, OSSL_NELEM(tls12_md));
-        rsign = tls12_find_id(*psig_nids++, tls12_sig, OSSL_NELEM(tls12_sig));
+        size_t j;
+        SIGALG_LOOKUP *curr;
+        int md_id = *psig_nids++;
+        int sig_id = *psig_nids++;
+
+        for (j = 0, curr = sigalg_lookup_tbl; j < OSSL_NELEM(sigalg_lookup_tbl);
+             j++, curr++) {
+            if (curr->hash == md_id && curr->sig == sig_id && !curr->notls12) {
+                *sptr++ = curr->sigalg;
+                break;
+            }
+        }
 
-        if (rhash == -1 || rsign == -1)
+        if (j == OSSL_NELEM(sigalg_lookup_tbl))
             goto err;
-        *sptr++ = rhash;
-        *sptr++ = rsign;
     }
 
     if (client) {
-- 
2.25.1