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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_TRACKED_PREF_HASH_CALCULATOR_H_ | |
6 #define CHROME_BROWSER_PREFS_TRACKED_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_TRACKED_PREF_HASH_CALCULATOR_H_ | |
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