Add SSL_CIPHER_is_AES[128|256]CBC.

Change-Id: I3072f884be77b8646e90d316154b96448f0cf2a1
Reviewed-on: https://boringssl-review.googlesource.com/6520
Reviewed-by: David Benjamin <davidben@chromium.org>
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/ssl_cipher.c b/ssl/ssl_cipher.c
index 9365e6c..a8751bd 100644
--- a/ssl/ssl_cipher.c
+++ b/ssl/ssl_cipher.c
@@ -1396,6 +1396,14 @@
   return (cipher->algorithm_enc & SSL_AES128GCM) != 0;
 }
 
+int SSL_CIPHER_is_AES128CBC(const SSL_CIPHER *cipher) {
+  return (cipher->algorithm_enc & SSL_AES128) != 0;
+}
+
+int SSL_CIPHER_is_AES256CBC(const SSL_CIPHER *cipher) {
+  return (cipher->algorithm_enc & SSL_AES256) != 0;
+}
+
 int SSL_CIPHER_is_CHACHA20POLY1305(const SSL_CIPHER *cipher) {
   return (cipher->algorithm_enc & SSL_CHACHA20POLY1305_OLD) != 0;
 }