Move SrtpSession and tests to their own files.

webrtc/pc/srtpfilter.h

Index: webrtc/pc/srtpfilter.h
diff --git a/webrtc/pc/srtpfilter.h b/webrtc/pc/srtpfilter.h
index 97ae26b00dcaca48a40ef765e9aa389470129791..15fdae9582a4019e8fb52534d576516385eeba28 100644
--- a/webrtc/pc/srtpfilter.h
+++ b/webrtc/pc/srtpfilter.h
@@ -191,87 +191,6 @@ class SrtpFilter {
   std::vector<int> recv_encrypted_header_extension_ids_;
 };
 
-// Class that wraps a libSRTP session.
-class SrtpSession {
- public:
-  SrtpSession();
-  ~SrtpSession();
-
-  // Configures the session for sending data using the specified
-  // cipher-suite and key. Receiving must be done by a separate session.
-  bool SetSend(int cs, const uint8_t* key, size_t len);
-  bool UpdateSend(int cs, const uint8_t* key, size_t len);
-
-  // Configures the session for receiving data using the specified
-  // cipher-suite and key. Sending must be done by a separate session.
-  bool SetRecv(int cs, const uint8_t* key, size_t len);
-  bool UpdateRecv(int cs, const uint8_t* key, size_t len);
-
-  void SetEncryptedHeaderExtensionIds(
-      const std::vector<int>& encrypted_header_extension_ids);
-
-  // Encrypts/signs an individual RTP/RTCP packet, in-place.
-  // If an HMAC is used, this will increase the packet size.
-  bool ProtectRtp(void* data, int in_len, int max_len, int* out_len);
-  // Overloaded version, outputs packet index.
-  bool ProtectRtp(void* data,
-                  int in_len,
-                  int max_len,
-                  int* out_len,
-                  int64_t* index);
-  bool ProtectRtcp(void* data, int in_len, int max_len, int* out_len);
-  // Decrypts/verifies an invidiual RTP/RTCP packet.
-  // If an HMAC is used, this will decrease the packet size.
-  bool UnprotectRtp(void* data, int in_len, int* out_len);
-  bool UnprotectRtcp(void* data, int in_len, int* out_len);
-
-  // Helper method to get authentication params.
-  bool GetRtpAuthParams(uint8_t** key, int* key_len, int* tag_len);
-
-  int GetSrtpOverhead() const;
-
-  // If external auth is enabled, SRTP will write a dummy auth tag that then
-  // later must get replaced before the packet is sent out. Only supported for
-  // non-GCM cipher suites and can be checked through "IsExternalAuthActive"
-  // if it is actually used. This method is only valid before the RTP params
-  // have been set.
-  void EnableExternalAuth();
-  bool IsExternalAuthEnabled() const;
-
-  // A SRTP session supports external creation of the auth tag if a non-GCM
-  // cipher is used. This method is only valid after the RTP params have
-  // been set.
-  bool IsExternalAuthActive() const;
-
-  // Calls srtp_shutdown if it's initialized.
-  static void Terminate();
-
- private:
-  bool DoSetKey(int type, int cs, const uint8_t* key, size_t len);
-  bool SetKey(int type, int cs, const uint8_t* key, size_t len);
-  bool UpdateKey(int type, int cs, const uint8_t* key, size_t len);
-  bool SetEncryptedHeaderExtensionIds(int type,
-      const std::vector<int>& encrypted_header_extension_ids);
-    // Returns send stream current packet index from srtp db.
-  bool GetSendStreamPacketIndex(void* data, int in_len, int64_t* index);
-
-  static bool Init();
-  void HandleEvent(const srtp_event_data_t* ev);
-  static void HandleEventThunk(srtp_event_data_t* ev);
-
-  rtc::ThreadChecker thread_checker_;
-  srtp_ctx_t_* session_ = nullptr;
-  int rtp_auth_tag_len_ = 0;
-  int rtcp_auth_tag_len_ = 0;
-  static bool inited_;
-  static rtc::GlobalLockPod lock_;
-  int last_send_seq_num_ = -1;
-  bool external_auth_active_ = false;
-  bool external_auth_enabled_ = false;
-  std::vector<int> encrypted_header_extension_ids_;
-  RTC_DISALLOW_COPY_AND_ASSIGN(SrtpSession);
-};
-
 }  // namespace cricket
 
 #endif  // WEBRTC_PC_SRTPFILTER_H_