Implement the encrypt-then-MAC TLS extension.

net/third_party/nss/ssl/sslt.h

 /*
  * This file contains prototypes for the public SSL functions.
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef __sslt_h_
 #define __sslt_h_
 
@@ skipping 186 matching lines @@
     ssl_cert_status_xtn              = 5,
 #ifdef NSS_ENABLE_ECC
     ssl_elliptic_curves_xtn          = 10,
     ssl_ec_point_formats_xtn         = 11,
 #endif
     ssl_signature_algorithms_xtn     = 13,
     ssl_use_srtp_xtn                 = 14,
     ssl_app_layer_protocol_xtn       = 16,
     ssl_signed_certificate_timestamp_xtn = 18,   /* RFC 6962 */
     ssl_session_ticket_xtn           = 35,
+    ssl_encrypt_then_mac_xtn         = 0x42,
     ssl_next_proto_nego_xtn          = 13172,
     ssl_channel_id_xtn               = 30032,
     ssl_padding_xtn                  = 35655,
     ssl_renegotiation_info_xtn       = 0xff01   /* experimental number */
 } SSLExtensionType;
 
-#define SSL_MAX_EXTENSIONS             12 /* doesn't include ssl_padding_xtn. */
+#define SSL_MAX_EXTENSIONS             13 /* doesn't include ssl_padding_xtn. */
 
 #endif /* __sslt_h_ */