Easy Sign-in: Use TPM RSA key to sign nonce in sign-in protocol

chrome/browser/signin/easy_unlock_service.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 CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_
 #define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 237 matching lines @@
   void OnCryptohomeKeysFetchedForChecking(
       const std::string& user_id,
       const std::set<std::string> paired_devices,
       bool success,
       const chromeos::EasyUnlockDeviceKeyDataList& key_data_list);
 #endif
 
   // Updates the service to state for handling system suspend.
   void PrepareForSuspend();
 
+  void EnsureTpmKeyPresentIfNeeded();
+
   Profile* profile_;
 
   // Created lazily in |GetScreenlockStateHandler|.
   scoped_ptr<EasyUnlockScreenlockStateHandler> screenlock_state_handler_;
 
   // The handler for the current auth attempt. Set iff an auth attempt is in
   // progress.
   scoped_ptr<EasyUnlockAuthAttempt> auth_attempt_;
 
   scoped_ptr<BluetoothDetector> bluetooth_detector_;
 
 #if defined(OS_CHROMEOS)
   // Monitors suspend and wake state of ChromeOS.
   class PowerMonitor;
   scoped_ptr<PowerMonitor> power_monitor_;
 #endif
 
   // Whether the service has been shut down.
   bool shut_down_;
 
+  bool tpm_key_checked_;
+
   ObserverList<EasyUnlockServiceObserver> observers_;
 
   base::WeakPtrFactory<EasyUnlockService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EasyUnlockService);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_