Add support for GCM cipher suites from RFC 7714.

talk/session/media/srtpfilter.h

 /*
  * libjingle
  * Copyright 2009 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 30 matching lines @@
 #include "webrtc/base/sigslotrepeater.h"
 #include "webrtc/base/sslstreamadapter.h"
 
 // Forward declaration to avoid pulling in libsrtp headers here
 struct srtp_event_data_t;
 struct srtp_ctx_t;
 struct srtp_policy_t;
 
 namespace cricket {
 
-// Key is 128 bits and salt is 112 bits == 30 bytes. B64 bloat => 40 bytes.
-extern const int SRTP_MASTER_KEY_BASE64_LEN;
-
-// Needed for DTLS-SRTP
-extern const int SRTP_MASTER_KEY_KEY_LEN;
-extern const int SRTP_MASTER_KEY_SALT_LEN;
-
 class SrtpSession;
 class SrtpStat;
 
 void EnableSrtpDebugging();
 void ShutdownSrtp();
 
 // Class to transform SRTP to/from RTP.
 // Initialize by calling SetSend with the local security params, then call
 // SetRecv once the remote security params are received. At that point
 // Protect/UnprotectRt(c)p can be called to encrypt/decrypt data.
@@ skipping 253 matching lines @@
   std::map<FailureKey, FailureStat> failures_;
   // Threshold in ms to silent the signaling errors.
   uint32_t signal_silent_time_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(SrtpStat);
 };
 
 }  // namespace cricket
 
 #endif  // TALK_SESSION_MEDIA_SRTPFILTER_H_