Implement debugging local unlock keys in chrome://proximity-auth.

components/proximity_auth/device_to_device_initiator_operations.cc

 // Copyright 2015 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.
 
 #include "components/proximity_auth/device_to_device_initiator_operations.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "components/proximity_auth/cryptauth/proto/cryptauth_api.pb.h"
 #include "components/proximity_auth/cryptauth/proto/securemessage.pb.h"
@@ skipping 197 matching lines @@
 
 // Called after the inner-most layer of [Responder Auth] is unwrapped.
 void OnInnerMessageUnwrappedForResponderAuth(
     const ValidateResponderAuthMessageContext& context,
     bool verified,
     const std::string& payload,
     const securemessage::Header& header) {
   if (!verified)
     PA_LOG(INFO) << "Failed to unwrap inner [Responder Auth] message.";
 
+  // Note: The GMS Core implementation does not properly set the metadata
+  // version, so we only check that the type is UNLOCK_KEY_SIGNED_CHALLENGE.
   cryptauth::GcmMetadata gcm_metadata;
   if (!gcm_metadata.ParseFromString(header.public_metadata()) ||
-      gcm_metadata.type() != cryptauth::UNLOCK_KEY_SIGNED_CHALLENGE ||
-      gcm_metadata.version() != kGcmMetadataVersion) {
+      gcm_metadata.type() != cryptauth::UNLOCK_KEY_SIGNED_CHALLENGE) {
     PA_LOG(WARNING) << "Failed to validate GcmMetadata in inner-most "
                     << "[Responder Auth] message.";
     context.callback.Run(false, std::string());
     return;
   }
 
   context.callback.Run(verified, context.session_symmetric_key);
 }
 
 }  // namespace
@@ skipping 87 matching lines @@
   create_options.encryption_scheme = securemessage::AES_256_CBC;
   create_options.signature_scheme = securemessage::HMAC_SHA256;
   create_options.associated_data = responder_auth_message;
   secure_message_delegate->CreateSecureMessage(
       kPayloadFiller, persistent_symmetric_key, create_options,
       base::Bind(&OnInnerMessageCreatedForInitiatorAuth, session_symmetric_key,
                  secure_message_delegate, callback));
 }
 
 }  // proximity_auth