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// Copyright (c) 2012 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 CHROMEOS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
#define CHROMEOS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/memory/weak_ptr.h"
#include "chromeos/chromeos_export.h"
namespace chromeos {
// This class is used to get the system salt from cryptohome and cache it.
class CHROMEOS_EXPORT SystemSaltGetter {
public:
typedef base::Callback<void(const std::string& system_salt)>
GetSystemSaltCallback;
// Manage an explicitly initialized global instance.
static void Initialize();
static bool IsInitialized();
static void Shutdown();
static SystemSaltGetter* Get();
// Converts |salt| to a hex encoded string.
static std::string ConvertRawSaltToHexString(const std::vector<uint8>& salt);
// Returns system hash in hex encoded ascii format. Note: this may return
// an empty string (e.g. if cryptohome is not running). It is up to the
// calling function to try again after a delay if desired.
void GetSystemSalt(const GetSystemSaltCallback& callback);
// Synchronous version of GetSystemSalt().
// Blocks the UI thread until the Cryptohome service returns the result.
// DEPRECATED: DO NOT USE.
std::string GetSystemSaltSync();
// Returns system hash in hex encoded ascii format, cached by a prior call
// to GetSystemSalt(). Note: this may return an empty string (e.g. if
// GetSystemSalt() is not yet called).
std::string GetCachedSystemSalt();
protected:
SystemSaltGetter();
~SystemSaltGetter();
private:
// Used to implement GetSystemSalt().
void GetSystemSaltInternal(const GetSystemSaltCallback& callback,
bool service_is_available);
// Loads the system salt from cryptohome and caches it.
void LoadSystemSalt();
std::string system_salt_;
base::WeakPtrFactory<SystemSaltGetter> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(SystemSaltGetter);
};
} // namespace chromeos
#endif // CHROMEOS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
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