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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROMEOS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
      6 #define CHROMEOS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
      7 
      8 #include <string>
      9 #include <vector>
     10 
     11 #include "base/basictypes.h"
     12 #include "base/callback_forward.h"
     13 #include "base/memory/weak_ptr.h"
     14 #include "chromeos/chromeos_export.h"
     15 #include "chromeos/dbus/dbus_method_call_status.h"
     16 
     17 namespace chromeos {
     18 
     19 // This class is used to get the system salt from cryptohome and cache it.
     20 class CHROMEOS_EXPORT SystemSaltGetter {
     21  public:
     22   typedef base::Callback<void(const std::string& system_salt)>
     23       GetSystemSaltCallback;
     24 
     25   // Manage an explicitly initialized global instance.
     26   static void Initialize();
     27   static bool IsInitialized();
     28   static void Shutdown();
     29   static SystemSaltGetter* Get();
     30 
     31   // Converts |salt| to a hex encoded string.
     32   static std::string ConvertRawSaltToHexString(const std::vector<uint8>& salt);
     33 
     34   // Returns system hash in hex encoded ascii format. Note: this may return
     35   // an empty string (e.g. errors in D-Bus layer)
     36   void GetSystemSalt(const GetSystemSaltCallback& callback);
     37 
     38  protected:
     39   SystemSaltGetter();
     40   ~SystemSaltGetter();
     41 
     42  private:
     43   // Used to implement GetSystemSalt().
     44   void DidWaitForServiceToBeAvailable(const GetSystemSaltCallback& callback,
     45                                       bool service_is_available);
     46   void DidGetSystemSalt(const GetSystemSaltCallback& callback,
     47                         DBusMethodCallStatus call_status,
     48                         const std::vector<uint8>& system_salt);
     49 
     50   std::string system_salt_;
     51 
     52   base::WeakPtrFactory<SystemSaltGetter> weak_ptr_factory_;
     53 
     54   DISALLOW_COPY_AND_ASSIGN(SystemSaltGetter);
     55 };
     56 
     57 }  // namespace chromeos
     58 
     59 #endif  // CHROMEOS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
     60