Enforce incrementing counter for TLS 1.2 AES-GCM.

Change-Id: I7e790bc176369f2a57cc486c3dc960971faf019d
Reviewed-on: https://boringssl-review.googlesource.com/16625
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/include/openssl/cipher.h b/include/openssl/cipher.h
index f93f4cb..5710e3c 100644
--- a/include/openssl/cipher.h
+++ b/include/openssl/cipher.h
@@ -586,5 +586,6 @@
 #define CIPHER_R_UNSUPPORTED_TAG_SIZE 122
 #define CIPHER_R_WRONG_FINAL_BLOCK_LENGTH 123
 #define CIPHER_R_NO_DIRECTION_SET 124
+#define CIPHER_R_INVALID_NONCE 125
 
 #endif  /* OPENSSL_HEADER_CIPHER_H */