Negotiate the same SRTP crypto suites for every DTLS association formed.

webrtc/p2p/base/dtlstransportinternal.h

 /*
  *  Copyright 2016 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 11 matching lines @@
 #include "webrtc/p2p/base/packettransportinternal.h"
 
 namespace cricket {
 
 enum PacketFlags {
   PF_NORMAL = 0x00,       // A normal packet.
   PF_SRTP_BYPASS = 0x01,  // An encrypted SRTP packet; bypass any additional
                           // crypto provided by the transport (e.g. DTLS)
 };
 
-// DtlsTransportInternal is an internal interface that does DTLS.
+// DtlsTransportInternal is an internal interface that does DTLS, also
+// negotiating SRTP crypto suites so that it may be used for DTLS-SRTP.
+//
 // Once the public interface is supported,
 // (https://www.w3.org/TR/webrtc/#rtcdtlstransport-interface)
 // the DtlsTransportInterface will be split from this class.
 class DtlsTransportInternal : public rtc::PacketTransportInternal {
  public:
   virtual ~DtlsTransportInternal() {}
 
   virtual DtlsTransportState dtls_state() const = 0;
 
   virtual const std::string& transport_name() const = 0;
 
   virtual int component() const = 0;
 
   virtual bool IsDtlsActive() const = 0;
 
   virtual bool GetSslRole(rtc::SSLRole* role) const = 0;
 
   virtual bool SetSslRole(rtc::SSLRole role) = 0;
 
-  // Sets up the ciphers to use for DTLS-SRTP.
-  virtual bool SetSrtpCryptoSuites(const std::vector<int>& ciphers) = 0;
-
-  // Keep the original one for backward compatibility until all dependencies
-  // move away. TODO(zhihuang): Remove this function.
-  virtual bool SetSrtpCiphers(const std::vector<std::string>& ciphers) = 0;
-
   // Finds out which DTLS-SRTP cipher was negotiated.
   // TODO(zhihuang): Remove this once all dependencies implement this.
   virtual bool GetSrtpCryptoSuite(int* cipher) = 0;
 
   // Finds out which DTLS cipher was negotiated.
   // TODO(zhihuang): Remove this once all dependencies implement this.
   virtual bool GetSslCipherSuite(int* cipher) = 0;
 
   // Gets the local RTCCertificate used for DTLS.
   virtual rtc::scoped_refptr<rtc::RTCCertificate> GetLocalCertificate()
@@ skipping 35 matching lines @@
  protected:
   DtlsTransportInternal() {}
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(DtlsTransportInternal);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_DTLSTRANSPORTINTERNAL_H_