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| 1 // Copyright 2013 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 CHROME_BROWSER_PREFS_PREF_HASH_CALCULATOR_H_ |
| 6 #define CHROME_BROWSER_PREFS_PREF_HASH_CALCULATOR_H_ |
| 7 |
| 8 #include <string> |
| 9 |
| 10 #include "base/basictypes.h" |
| 11 |
| 12 namespace base { |
| 13 class Value; |
| 14 } // namespace base |
| 15 |
| 16 // Calculates and validates preference value hashes. |
| 17 class PrefHashCalculator { |
| 18 public: |
| 19 enum ValidationResult { |
| 20 INVALID, |
| 21 VALID, |
| 22 VALID_LEGACY, |
| 23 }; |
| 24 |
| 25 // Constructs a PrefHashCalculator using |seed| and |device_id|. The same |
| 26 // parameters must be used in order to successfully validate generated hashes. |
| 27 // |device_id| may be empty. |
| 28 PrefHashCalculator(const std::string& seed, const std::string& device_id); |
| 29 |
| 30 // Calculates a hash value for the supplied preference |path| and |value|. |
| 31 // |value| may be null if the preference has no value. |
| 32 std::string Calculate(const std::string& path, const base::Value* value) |
| 33 const; |
| 34 |
| 35 // Validates the provided preference hash using current and legacy hashing |
| 36 // algorithms. |
| 37 ValidationResult Validate(const std::string& path, |
| 38 const base::Value* value, |
| 39 const std::string& hash) const; |
| 40 |
| 41 private: |
| 42 // Calculate a hash using a deprecated hash algorithm. For validating old |
| 43 // hashes during migration. |
| 44 std::string CalculateLegacyHash(const std::string& path, |
| 45 const base::Value* value) const; |
| 46 |
| 47 std::string seed_; |
| 48 std::string device_id_; |
| 49 |
| 50 DISALLOW_COPY_AND_ASSIGN(PrefHashCalculator); |
| 51 }; |
| 52 |
| 53 #endif // CHROME_BROWSER_PREFS_PREF_HASH_CALCULATOR_H_ |
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