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..13ffa6c2226d5c37b8462b8ed9c30f7021922b6e 100644
--- a/components/cryptauth/device_to_device_authenticator.h
+++ b/components/cryptauth/device_to_device_authenticator.h
@@ -5,12 +5,15 @@
 #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"
 #include "components/cryptauth/authenticator.h"
 #include "components/cryptauth/connection.h"
 #include "components/cryptauth/connection_observer.h"
+#include "components/cryptauth/session_keys.h"
 
 namespace base {
 class Timer;
@@ -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);
+                                const SessionKeys& session_keys);
 
   // Callback when [Initiator Auth] is created.
   void OnInitiatorAuthCreated(const std::string& message);
@@ -168,8 +171,8 @@ class DeviceToDeviceAuthenticator : public Authenticator,
   // The private key generated for the session.
   std::string local_session_private_key_;
 
-  // The derived symmetric key for the session.
-  std::string session_symmetric_key_;
+  // The derived symmetric keys for the session.
+  SessionKeys session_keys_;
 
   base::WeakPtrFactory<DeviceToDeviceAuthenticator> weak_ptr_factory_;