Add three Suite B modes to TLS code, supporting RFC6460.

(backport from HEAD)

ssl/s23_srvr.c

@@ -425,6 +425,13 @@ int ssl23_get_client_hello(SSL *s)
 			}
 		}
 
+	if (s->version < TLS1_2_VERSION && tls1_suiteb(s))
+		{
+		SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,
+				SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE);
+		goto err;
+		}
+
 #ifdef OPENSSL_FIPS
 	if (FIPS_mode() && (s->version < TLS1_VERSION))
 		{