Index: chrome/browser/prefs/pref_hash_calculator.h |
diff --git a/chrome/browser/prefs/pref_hash_calculator.h b/chrome/browser/prefs/pref_hash_calculator.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..6f0fd851790c341d8baae1241f4f27d427fa3513 |
--- /dev/null |
+++ b/chrome/browser/prefs/pref_hash_calculator.h |
@@ -0,0 +1,53 @@ |
+// 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_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); |
+ |
+ // 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: |
+ // Calculate a hash using a deprecated hash algorithm. For validating old |
+ // hashes during migration. |
+ std::string CalculateLegacyHash(const std::string& path, |
+ const base::Value* value) const; |
+ |
+ std::string seed_; |
+ std::string device_id_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(PrefHashCalculator); |
+}; |
+ |
+#endif // CHROME_BROWSER_PREFS_PREF_HASH_CALCULATOR_H_ |