Cast: Added support for AES-CTR crypto.

media/cast/audio_sender/audio_sender.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_CAST_AUDIO_SENDER_H_
 #define MEDIA_CAST_AUDIO_SENDER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
 #include "media/cast/cast_config.h"
 #include "media/cast/cast_environment.h"
 #include "media/cast/rtcp/rtcp.h"
 #include "media/cast/rtp_sender/rtp_sender.h"
 
+namespace crypto {
+  class Encryptor;
+}
+
 namespace media {
 class AudioBus;
 }
 
 namespace media {
 namespace cast {
 
 class AudioEncoder;
 class LocalRtcpAudioSenderFeedback;
 class LocalRtpSenderStatistics;
@@ skipping 33 matching lines @@
  protected:
   void SendEncodedAudioFrame(scoped_ptr<EncodedAudioFrame> audio_frame,
                              const base::TimeTicks& recorded_time);
 
  private:
   friend class LocalRtcpAudioSenderFeedback;
 
   void ResendPackets(
       const MissingFramesAndPacketsMap& missing_frames_and_packets);
 
+  // Caller must allocate the destination |encrypted_frame|. The data member
+  // will be resized to hold the encrypted size.
+  bool EncryptAudioFrame(const EncodedAudioFrame& audio_frame,
+                         EncodedAudioFrame* encrypted_frame);
+
   void ScheduleNextRtcpReport();
   void SendRtcpReport();
 
   void InitializeTimers();
 
   base::WeakPtrFactory<AudioSender> weak_factory_;
 
   scoped_refptr<CastEnvironment> cast_environment_;
   scoped_refptr<AudioEncoder> audio_encoder_;
   RtpSender rtp_sender_;
   scoped_ptr<LocalRtpSenderStatistics> rtp_audio_sender_statistics_;
   scoped_ptr<LocalRtcpAudioSenderFeedback> rtcp_feedback_;
   Rtcp rtcp_;
   bool initialized_;
+  scoped_ptr<crypto::Encryptor> encryptor_;
+  std::string iv_mask_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioSender);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_AUDIO_SENDER_H_