Add SSL_CIPHER_is_AEAD.

Change-Id: Ia6598ee4b2d4623abfc140d6a5c0eca4bcb30427
Reviewed-on: https://boringssl-review.googlesource.com/13180
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

include/openssl/ssl.h

@@ -1161,6 +1161,9 @@ OPENSSL_EXPORT int SSL_CIPHER_has_SHA1_HMAC(const SSL_CIPHER *cipher);
 /* SSL_CIPHER_has_SHA256_HMAC returns one if |cipher| uses HMAC-SHA256. */
 OPENSSL_EXPORT int SSL_CIPHER_has_SHA256_HMAC(const SSL_CIPHER *cipher);
 
+/* SSL_CIPHER_is_AEAD returns one if |cipher| uses an AEAD cipher. */
+OPENSSL_EXPORT int SSL_CIPHER_is_AEAD(const SSL_CIPHER *cipher);
+
 /* SSL_CIPHER_is_AESGCM returns one if |cipher| uses AES-GCM. */
 OPENSSL_EXPORT int SSL_CIPHER_is_AESGCM(const SSL_CIPHER *cipher);
 

ssl/ssl_cipher.c

@@ -1483,6 +1483,10 @@ int SSL_CIPHER_has_SHA256_HMAC(const SSL_CIPHER *cipher) {
   return (cipher->algorithm_mac & SSL_SHA256) != 0;
 }
 
+int SSL_CIPHER_is_AEAD(const SSL_CIPHER *cipher) {
+  return (cipher->algorithm_mac & SSL_AEAD) != 0;
+}
+
 int SSL_CIPHER_is_AESGCM(const SSL_CIPHER *cipher) {
   return (cipher->algorithm_enc & (SSL_AES128GCM | SSL_AES256GCM)) != 0;
 }