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 under a deprecated but as secure algorithm. 23 VALID_SECURE_LEGACY, 24 }; 25 26 // Constructs a PrefHashCalculator using |seed| and |device_id|. The same 27 // parameters must be used in order to successfully validate generated hashes. 28 // |device_id| may be empty. 29 PrefHashCalculator(const std::string& seed, const std::string& device_id); 30 31 ~PrefHashCalculator(); 32 33 // Calculates a hash value for the supplied preference |path| and |value|. 34 // |value| may be null if the preference has no value. 35 std::string Calculate(const std::string& path, const base::Value* value) 36 const; 37 38 // Validates the provided preference hash using current and legacy hashing 39 // algorithms. 40 ValidationResult Validate(const std::string& path, 41 const base::Value* value, 42 const std::string& hash) const; 43 44 private: 45 const std::string seed_; 46 const std::string device_id_; 47 const std::string legacy_device_id_; 48 49 DISALLOW_COPY_AND_ASSIGN(PrefHashCalculator); 50 }; 51 52 #endif // CHROME_BROWSER_PREFS_PREF_HASH_CALCULATOR_H_ 53
