Generalizing curves to groups in preparation for TLS 1.3.

The 'elliptic_curves' extension is being renamed to 'supported_groups'
in the TLS 1.3 draft, and most of the curve-specific methods are
generalized to groups/group IDs.

Change-Id: Icd1a1cf7365c8a4a64ae601993dc4273802610fb
Reviewed-on: https://boringssl-review.googlesource.com/7955
Reviewed-by: David Benjamin <davidben@google.com>

ssl/ssl_lib.c

diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 74c2d26..fd8c04c 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -341,7 +341,7 @@
   sk_X509_NAME_pop_free(ctx->client_CA, X509_NAME_free);
   sk_SRTP_PROTECTION_PROFILE_free(ctx->srtp_profiles);
   OPENSSL_free(ctx->psk_identity_hint);
-  OPENSSL_free(ctx->tlsext_ellipticcurvelist);
+  OPENSSL_free(ctx->supported_group_list);
   OPENSSL_free(ctx->alpn_client_proto_list);
   OPENSSL_free(ctx->ocsp_response);
   OPENSSL_free(ctx->signed_cert_timestamp_list);
@@ -403,14 +403,14 @@
   CRYPTO_refcount_inc(&ctx->references);
   ssl->initial_ctx = ctx;
 
-  if (ctx->tlsext_ellipticcurvelist) {
-    ssl->tlsext_ellipticcurvelist =
-        BUF_memdup(ctx->tlsext_ellipticcurvelist,
-                   ctx->tlsext_ellipticcurvelist_length * 2);
-    if (!ssl->tlsext_ellipticcurvelist) {
+  if (ctx->supported_group_list) {
+    ssl->supported_group_list =
+        BUF_memdup(ctx->supported_group_list,
+                   ctx->supported_group_list_len * 2);
+    if (!ssl->supported_group_list) {
       goto err;
     }
-    ssl->tlsext_ellipticcurvelist_length = ctx->tlsext_ellipticcurvelist_length;
+    ssl->supported_group_list_len = ctx->supported_group_list_len;
   }
 
   if (ssl->ctx->alpn_client_proto_list) {
@@ -499,7 +499,7 @@
 
   OPENSSL_free(ssl->tlsext_hostname);
   SSL_CTX_free(ssl->initial_ctx);
-  OPENSSL_free(ssl->tlsext_ellipticcurvelist);
+  OPENSSL_free(ssl->supported_group_list);
   OPENSSL_free(ssl->alpn_client_proto_list);
   EVP_PKEY_free(ssl->tlsext_channel_id_private);
   OPENSSL_free(ssl->psk_identity_hint);
@@ -1705,7 +1705,7 @@
       mask_a |= SSL_aRSA;
     } else if (ssl_private_key_type(ssl) == EVP_PKEY_EC) {
       /* An ECC certificate may be usable for ECDSA cipher suites depending on
-       * the key usage extension and on the client's curve preferences. */
+       * the key usage extension and on the client's group preferences. */
       X509 *x = ssl->cert->x509;
       /* This call populates extension flags (ex_flags). */
       X509_check_purpose(x, -1, 0);
@@ -1722,9 +1722,9 @@
     mask_k |= SSL_kDHE;
   }
 
-  /* Check for a shared curve to consider ECDHE ciphers. */
+  /* Check for a shared group to consider ECDHE ciphers. */
   uint16_t unused;
-  if (tls1_get_shared_curve(ssl, &unused)) {
+  if (tls1_get_shared_group(ssl, &unused)) {
     mask_k |= SSL_kECDHE;
   }