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// Copyright 2013 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_PREFS_PREF_HASH_CALCULATOR_H_
#define CHROME_BROWSER_PREFS_PREF_HASH_CALCULATOR_H_
#include <string>
#include "base/basictypes.h"
namespace base {
class Value;
} // namespace base
// Calculates and validates preference value hashes.
class PrefHashCalculator {
public:
enum ValidationResult {
INVALID,
VALID,
// Valid under a deprecated but as secure algorithm.
VALID_SECURE_LEGACY,
};
// Constructs a PrefHashCalculator using |seed| and |device_id|. The same
// parameters must be used in order to successfully validate generated hashes.
// |device_id| may be empty.
PrefHashCalculator(const std::string& seed, const std::string& device_id);
~PrefHashCalculator();
// Calculates a hash value for the supplied preference |path| and |value|.
// |value| may be null if the preference has no value.
std::string Calculate(const std::string& path, const base::Value* value)
const;
// Validates the provided preference hash using current and legacy hashing
// algorithms.
ValidationResult Validate(const std::string& path,
const base::Value* value,
const std::string& hash) const;
private:
const std::string seed_;
const std::string device_id_;
DISALLOW_COPY_AND_ASSIGN(PrefHashCalculator);
};
#endif // CHROME_BROWSER_PREFS_PREF_HASH_CALCULATOR_H_
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