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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 #include "base/hmac.h" | |
| 6 #include "base/logging.h" | |
| 7 | |
| 8 HMAC::HMAC(HashAlgorithm hash_alg, const unsigned char* key, int key_length) | |
| 9 : hash_alg_(hash_alg), | |
| 10 provider_(NULL), | |
| 11 hash_(NULL), | |
| 12 hkey_(NULL) { | |
| 13 if (!CryptAcquireContext(&provider_, NULL, NULL, | |
| 14 PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) | |
| 15 provider_ = NULL; | |
| 16 ImportKey(key, key_length); | |
| 17 } | |
| 18 | |
| 19 HMAC::~HMAC() { | |
| 20 if (hkey_) | |
| 21 CryptDestroyKey(hkey_); | |
| 22 if (hash_) | |
| 23 CryptDestroyHash(hash_); | |
| 24 if (provider_) | |
| 25 CryptReleaseContext(provider_, 0); | |
| 26 } | |
| 27 | |
| 28 bool HMAC::Sign(const std::string& data, | |
| 29 unsigned char* digest, | |
| 30 int digest_length) { | |
| 31 if (!provider_ || !hkey_) | |
| 32 return false; | |
| 33 | |
| 34 switch (hash_alg_) { | |
| 35 case SHA1: | |
| 36 return SignWithSHA1(data, digest, digest_length); | |
| 37 default: | |
| 38 NOTREACHED(); | |
| 39 return false; | |
| 40 } | |
| 41 } | |
| 42 | |
| 43 void HMAC::ImportKey(const unsigned char* key, int key_length) { | |
| 44 if (key_length > kMaxKeySize) { | |
| 45 NOTREACHED(); | |
| 46 return; | |
| 47 } | |
| 48 | |
| 49 struct { | |
| 50 BLOBHEADER header; | |
| 51 DWORD key_size; | |
| 52 BYTE key_data[kMaxKeySize]; | |
| 53 } key_blob; | |
| 54 key_blob.header.bType = PLAINTEXTKEYBLOB; | |
| 55 key_blob.header.bVersion = CUR_BLOB_VERSION; | |
| 56 key_blob.header.reserved = 0; | |
| 57 key_blob.header.aiKeyAlg = CALG_RC2; | |
| 58 key_blob.key_size = key_length; | |
| 59 memcpy(key_blob.key_data, key, key_length); | |
| 60 | |
| 61 if (!CryptImportKey(provider_, | |
| 62 reinterpret_cast<const BYTE *>(&key_blob), | |
| 63 sizeof(key_blob), 0, 0, &hkey_)) | |
| 64 hkey_ = NULL; | |
| 65 | |
| 66 // Destroy the copy of the key. | |
| 67 SecureZeroMemory(key_blob.key_data, key_length); | |
| 68 } | |
| 69 | |
| 70 bool HMAC::SignWithSHA1(const std::string& data, | |
| 71 unsigned char* digest, | |
| 72 int digest_length) { | |
| 73 DCHECK(provider_); | |
| 74 DCHECK(hkey_); | |
| 75 | |
| 76 if (!CryptCreateHash(provider_, CALG_HMAC, hkey_, 0, &hash_)) | |
| 77 return false; | |
| 78 | |
| 79 HMAC_INFO hmac_info; | |
| 80 memset(&hmac_info, 0, sizeof(hmac_info)); | |
| 81 hmac_info.HashAlgid = CALG_SHA1; | |
| 82 if (!CryptSetHashParam(hash_, HP_HMAC_INFO, | |
| 83 reinterpret_cast<BYTE*>(&hmac_info), 0)) | |
| 84 return false; | |
| 85 | |
| 86 if (!CryptHashData(hash_, | |
| 87 reinterpret_cast<const BYTE*>(data.data()), | |
| 88 static_cast<DWORD>(data.size()), 0)) | |
| 89 return false; | |
| 90 | |
| 91 DWORD sha1_size = digest_length; | |
| 92 if (!CryptGetHashParam(hash_, HP_HASHVAL, digest, &sha1_size, 0)) | |
| 93 return false; | |
| 94 | |
| 95 return true; | |
| 96 } | |
| 97 | |
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Chromium Code Reviews
Issue 218:
HMAC-SHA1 implementation for Mac based on CommonCrypto (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/