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comparison: ipc/chromium/src/base/hmac.h
ipc/chromium/src/base/hmac.h
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| 1 // Copyright (c) 2006-2008 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 // Utility class for calculating the HMAC for a given message. We currently | |
| 6 // only support SHA1 for the hash algorithm, but this can be extended easily. | |
| 7 | |
| 8 #ifndef BASE_HMAC_H_ | |
| 9 #define BASE_HMAC_H_ | |
| 10 | |
| 11 #include <string> | |
| 12 | |
| 13 #include "base/basictypes.h" | |
| 14 #include "base/scoped_ptr.h" | |
| 15 | |
| 16 namespace base { | |
| 17 | |
| 18 // Simplify the interface and reduce includes by abstracting out the internals. | |
| 19 struct HMACPlatformData; | |
| 20 | |
| 21 class HMAC { | |
| 22 public: | |
| 23 // The set of supported hash functions. Extend as required. | |
| 24 enum HashAlgorithm { | |
| 25 SHA1 | |
| 26 }; | |
| 27 | |
| 28 explicit HMAC(HashAlgorithm hash_alg); | |
| 29 ~HMAC(); | |
| 30 | |
| 31 // Initializes this instance using |key| of the length |key_length|. Call Init | |
| 32 // only once. It returns false on the second or later calls. | |
| 33 bool Init(const unsigned char* key, int key_length); | |
| 34 | |
| 35 // Initializes this instance using |key|. Call Init only once. It returns | |
| 36 // false on the second or later calls. | |
| 37 bool Init(const std::string& key) { | |
| 38 return Init(reinterpret_cast<const unsigned char*>(key.data()), | |
| 39 static_cast<int>(key.size())); | |
| 40 } | |
| 41 | |
| 42 // Calculates the HMAC for the message in |data| using the algorithm supplied | |
| 43 // to the constructor and the key supplied to the Init method. The HMAC is | |
| 44 // returned in |digest|, which has |digest_length| bytes of storage available. | |
| 45 bool Sign(const std::string& data, unsigned char* digest, int digest_length); | |
| 46 | |
| 47 private: | |
| 48 HashAlgorithm hash_alg_; | |
| 49 scoped_ptr<HMACPlatformData> plat_; | |
| 50 | |
| 51 DISALLOW_COPY_AND_ASSIGN(HMAC); | |
| 52 }; | |
| 53 | |
| 54 } // namespace base | |
| 55 | |
| 56 #endif // BASE_HMAC_H_ |
