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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be | 
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. | 
| 4 | 4 | 
| 5 #include "crypto/hmac.h" | 5 #include "crypto/hmac.h" | 
| 6 | 6 | 
| 7 #include <openssl/hmac.h> | 7 #include <openssl/hmac.h> | 
| 8 #include <stddef.h> | 8 #include <stddef.h> | 
| 9 | 9 | 
| 10 #include <algorithm> | 10 #include <algorithm> | 
| 11 | 11 | 
| 12 #include "base/logging.h" | 12 #include "base/logging.h" | 
| 13 #include "base/stl_util.h" | 13 #include "base/stl_util.h" | 
| 14 #include "crypto/openssl_util.h" | 14 #include "crypto/openssl_util.h" | 
| 15 #include "crypto/secure_util.h" | 15 #include "crypto/secure_util.h" | 
| 16 #include "crypto/symmetric_key.h" | 16 #include "crypto/symmetric_key.h" | 
| 17 | 17 | 
| 18 namespace crypto { | 18 namespace crypto { | 
| 19 | 19 | 
| 20 HMAC::HMAC(HashAlgorithm hash_alg) : hash_alg_(hash_alg), initialized_(false) { | 20 HMAC::HMAC(HashAlgorithm hash_alg) : hash_alg_(hash_alg), initialized_(false) { | 
| 21   // Only SHA-1 and SHA-256 hash algorithms are supported now. | 21   // Only SHA-1 and SHA-256 hash algorithms are supported now. | 
| 22   DCHECK(hash_alg_ == SHA1 || hash_alg_ == SHA256); | 22   DCHECK(hash_alg_ == SHA1 || hash_alg_ == SHA256); | 
| 23 } | 23 } | 
| 24 | 24 | 
| 25 HMAC::~HMAC() { | 25 HMAC::~HMAC() { | 
| 26   // Zero out key copy. | 26   // Zero out key copy. | 
| 27   key_.assign(key_.size(), 0); | 27   key_.assign(key_.size(), 0); | 
| 28   STLClearObject(&key_); | 28   base::STLClearObject(&key_); | 
| 29 } | 29 } | 
| 30 | 30 | 
| 31 size_t HMAC::DigestLength() const { | 31 size_t HMAC::DigestLength() const { | 
| 32   switch (hash_alg_) { | 32   switch (hash_alg_) { | 
| 33     case SHA1: | 33     case SHA1: | 
| 34       return 20; | 34       return 20; | 
| 35     case SHA256: | 35     case SHA256: | 
| 36       return 32; | 36       return 32; | 
| 37     default: | 37     default: | 
| 38       NOTREACHED(); | 38       NOTREACHED(); | 
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| 84   std::unique_ptr<unsigned char[]> computed_digest( | 84   std::unique_ptr<unsigned char[]> computed_digest( | 
| 85       new unsigned char[digest_length]); | 85       new unsigned char[digest_length]); | 
| 86   if (!Sign(data, computed_digest.get(), digest_length)) | 86   if (!Sign(data, computed_digest.get(), digest_length)) | 
| 87     return false; | 87     return false; | 
| 88 | 88 | 
| 89   return SecureMemEqual(digest.data(), computed_digest.get(), | 89   return SecureMemEqual(digest.data(), computed_digest.get(), | 
| 90                         std::min(digest.size(), digest_length)); | 90                         std::min(digest.size(), digest_length)); | 
| 91 } | 91 } | 
| 92 | 92 | 
| 93 }  // namespace crypto | 93 }  // namespace crypto | 
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