Updating D2D protocol to v1 to support separate sequence numbers.

components/cryptauth/device_to_device_authenticator.h

Index: components/cryptauth/device_to_device_authenticator.h
diff --git a/components/cryptauth/device_to_device_authenticator.h b/components/cryptauth/device_to_device_authenticator.h
index e398206b2bab3384a0feb345a58eb1461cf6ec56..b01a977ed0a3967120685dcfdf88fc5c1bfb552a 100644
--- a/components/cryptauth/device_to_device_authenticator.h
+++ b/components/cryptauth/device_to_device_authenticator.h
@@ -5,6 +5,8 @@
 #ifndef COMPONENTS_CRYPTAUTH_DEVICE_TO_DEVICE_AUTHENTICATOR_H_
 #define COMPONENTS_CRYPTAUTH_DEVICE_TO_DEVICE_AUTHENTICATOR_H_
 
+#include <memory>
+
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ -18,6 +20,7 @@ class Timer;
 
 namespace cryptauth {
 class SecureMessageDelegate;
+class SessionKeys;
 }
 
 namespace cryptauth {
@@ -110,7 +113,7 @@ class DeviceToDeviceAuthenticator : public Authenticator,
 
   // Callback for validating the received [Remote Auth].
   void OnResponderAuthValidated(bool validated,
-                                const std::string& session_symmetric_key);
+                                std::unique_ptr<SessionKeys> session_keys);
 
   // Callback when [Initiator Auth] is created.
   void OnInitiatorAuthCreated(const std::string& message);
@@ -169,7 +172,7 @@ class DeviceToDeviceAuthenticator : public Authenticator,
   std::string local_session_private_key_;
 
   // The derived symmetric key for the session.

[Tim Song, 2017/05/22 23:18:24]

nit: s/key/keys

[sacomoto, 2017/05/23 09:50:13]

Done.

-  std::string session_symmetric_key_;
+  std::unique_ptr<SessionKeys> session_keys_;
 
   base::WeakPtrFactory<DeviceToDeviceAuthenticator> weak_ptr_factory_;