Add various functions for SSL_CIPHER.

Change-Id: I21051a6d1594c2606e171449d377663f8eccc847
Reviewed-on: https://boringssl-review.googlesource.com/6450
Reviewed-by: Adam Langley <agl@google.com>

ssl/ssl_cipher.c

diff --git a/ssl/ssl_cipher.c b/ssl/ssl_cipher.c
index 0ffeb5b..e87835f 100644
--- a/ssl/ssl_cipher.c
+++ b/ssl/ssl_cipher.c
@@ -1384,10 +1384,18 @@
   return (cipher->algorithm_mac & SSL_MD5) != 0;
 }
 
+int SSL_CIPHER_has_SHA1_HMAC(const SSL_CIPHER *cipher) {
+  return (cipher->algorithm_mac & SSL_SHA1) != 0;
+}
+
 int SSL_CIPHER_is_AESGCM(const SSL_CIPHER *cipher) {
   return (cipher->algorithm_enc & (SSL_AES128GCM | SSL_AES256GCM)) != 0;
 }
 
+int SSL_CIPHER_is_AES128GCM(const SSL_CIPHER *cipher) {
+  return (cipher->algorithm_enc & SSL_AES128GCM) != 0;
+}
+
 int SSL_CIPHER_is_CHACHA20POLY1305(const SSL_CIPHER *cipher) {
   return (cipher->algorithm_enc & SSL_CHACHA20POLY1305_OLD) != 0;
 }
@@ -1406,6 +1414,17 @@
       cipher->algorithm_mac != SSL_AEAD;
 }
 
+int SSL_CIPHER_is_ECDSA(const SSL_CIPHER *cipher) {
+  return (cipher->algorithm_auth & SSL_aECDSA) != 0;
+}
+
+uint16_t SSL_CIPHER_get_min_version(const SSL_CIPHER *cipher) {
+  if (cipher->algorithm_ssl & SSL_TLSV1_2) {
+    return TLS1_2_VERSION;
+  }
+  return SSL3_VERSION;
+}
+
 /* return the actual cipher being used */
 const char *SSL_CIPHER_get_name(const SSL_CIPHER *cipher) {
   if (cipher != NULL) {