[Cast Channel] Add support for nonce challenge to Cast channel authentication.

extensions/browser/api/cast_channel/cast_socket.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_SOCKET_H_
 #define EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_SOCKET_H_
 
 #include <stdint.h>
 
 #include <queue>
@@ skipping 200 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(CastSocketTest, TestConnectAuthMessageCorrupted);
   FRIEND_TEST_ALL_PREFIXES(CastSocketTest,
                            TestConnectChallengeReplyReceiveError);
   FRIEND_TEST_ALL_PREFIXES(CastSocketTest,
                            TestConnectChallengeVerificationFails);
   friend class AuthTransportDelegate;
   friend class ApiResourceManager<CastSocketImpl>;
   friend class CastSocketTest;
   friend class TestCastSocket;
 
+  static void EnsureNonceTimely();
+
   void SetErrorState(ChannelError error_state) override;
 
   // Frees resources and cancels pending callbacks.  |ready_state_| will be set
   // READY_STATE_CLOSED on completion.  A no-op if |ready_state_| is already
   // READY_STATE_CLOSED.
   void CloseInternal();
 
   // Creates an instance of TCPClientSocket.
   virtual std::unique_ptr<net::TCPClientSocket> CreateTcpSocket();
   // Creates an instance of SSLClientSocket with the given underlying |socket|.
@@ skipping 45 matching lines @@
   // Runs the external connection callback and resets it.
   void DoConnectCallback();
 
   virtual bool CalledOnValidThread() const;
 
   virtual base::Timer* GetTimer();
 
   void SetConnectState(proto::ConnectionState connect_state);
   void SetReadyState(ReadyState ready_state);
 
+  // The nonce challenge to send to the Cast receiver.
+  // The nonce is updated daily.
+  static std::string nonce_;
+  static base::Time nonce_generation_time_;
+
   base::ThreadChecker thread_checker_;
 
   const std::string owner_extension_id_;
   // The id of the channel.
   int channel_id_;
   // The IP endpoint that the the channel is connected to.
   net::IPEndPoint ip_endpoint_;
   // Receiver authentication requested for the channel.
   ChannelAuthType channel_auth_;
   // The NetLog for this service.
@@ skipping 83 matching lines @@
   // information.
   AuthTransportDelegate* auth_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(CastSocketImpl);
 };
 }  // namespace cast_channel
 }  // namespace api
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_CAST_CHANNEL_CAST_SOCKET_H_