Add support for GCM cipher suites from RFC 7714.

webrtc/p2p/base/dtlstransportchannel.cc

 /*
  *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 77 matching lines @@
 
 DtlsTransportChannelWrapper::DtlsTransportChannelWrapper(
     Transport* transport,
     TransportChannelImpl* channel)
     : TransportChannelImpl(channel->transport_name(), channel->component()),
       transport_(transport),
       worker_thread_(rtc::Thread::Current()),
       channel_(channel),
       downward_(NULL),
       ssl_role_(rtc::SSL_CLIENT),
-      ssl_max_version_(rtc::SSL_PROTOCOL_DTLS_10) {
+      ssl_max_version_(rtc::SSL_PROTOCOL_DTLS_10),
+      enable_gcm_ciphers_(false) {
   channel_->SignalWritableState.connect(this,
       &DtlsTransportChannelWrapper::OnWritableState);
   channel_->SignalReadPacket.connect(this,
       &DtlsTransportChannelWrapper::OnReadPacket);
   channel_->SignalSentPacket.connect(
       this, &DtlsTransportChannelWrapper::OnSentPacket);
   channel_->SignalReadyToSend.connect(this,
       &DtlsTransportChannelWrapper::OnReadyToSend);
   channel_->SignalGatheringState.connect(
       this, &DtlsTransportChannelWrapper::OnGatheringState);
@@ skipping 51 matching lines @@
   if (dtls_active_) {
     LOG(LS_ERROR) << "Not changing max. protocol version "
                   << "while DTLS is negotiating";
     return false;
   }
 
   ssl_max_version_ = version;
   return true;
 }
 
+bool DtlsTransportChannelWrapper::SetEnableGcmCiphers(bool enable) {
+  if (dtls_active_) {
+    LOG(LS_ERROR) << "Not changing enabled GCM ciphers "
+                  << "while DTLS is negotiating";
+    return false;
+  }
+
+  enable_gcm_ciphers_ = enable;
+  return true;
+}
+
+bool DtlsTransportChannelWrapper::IsEnableGcmCiphers() const {
+  return enable_gcm_ciphers_;
+}
+
 bool DtlsTransportChannelWrapper::SetSslRole(rtc::SSLRole role) {
   if (dtls_state() == DTLS_TRANSPORT_CONNECTED) {
     if (ssl_role_ != role) {
       LOG(LS_ERROR) << "SSL Role can't be reversed after the session is setup.";
       return false;
     }
     return true;
   }
 
   ssl_role_ = role;
@@ skipping 448 matching lines @@
 
 void DtlsTransportChannelWrapper::Reconnect() {
   set_dtls_state(DTLS_TRANSPORT_NEW);
   set_writable(false);
   if (channel_->writable()) {
     OnWritableState(channel_);
   }
 }
 
 }  // namespace cricket