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1 // Copyright (c) 2011 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 "crypto/hmac.h" | |
6 | |
7 #include <openssl/hmac.h> | |
8 #include <stddef.h> | |
9 | |
10 #include <algorithm> | |
11 #include <memory> | |
12 #include <vector> | |
13 | |
14 #include "base/logging.h" | |
15 #include "base/stl_util.h" | |
16 #include "crypto/openssl_util.h" | |
17 | |
18 namespace crypto { | |
19 | |
20 struct HMACPlatformData { | |
21 std::vector<unsigned char> key; | |
22 }; | |
23 | |
24 HMAC::HMAC(HashAlgorithm hash_alg) : hash_alg_(hash_alg) { | |
25 // Only SHA-1 and SHA-256 hash algorithms are supported now. | |
26 DCHECK(hash_alg_ == SHA1 || hash_alg_ == SHA256); | |
27 } | |
28 | |
29 bool HMAC::Init(const unsigned char* key, size_t key_length) { | |
30 // Init must not be called more than once on the same HMAC object. | |
31 DCHECK(!plat_); | |
32 plat_.reset(new HMACPlatformData()); | |
33 plat_->key.assign(key, key + key_length); | |
34 return true; | |
35 } | |
36 | |
37 HMAC::~HMAC() { | |
38 if (plat_) { | |
39 // Zero out key copy. | |
40 plat_->key.assign(plat_->key.size(), 0); | |
41 STLClearObject(&plat_->key); | |
42 } | |
43 } | |
44 | |
45 bool HMAC::Sign(const base::StringPiece& data, | |
46 unsigned char* digest, | |
47 size_t digest_length) const { | |
48 DCHECK(plat_); // Init must be called before Sign. | |
49 | |
50 ScopedOpenSSLSafeSizeBuffer<EVP_MAX_MD_SIZE> result(digest, digest_length); | |
51 return !!::HMAC(hash_alg_ == SHA1 ? EVP_sha1() : EVP_sha256(), | |
52 plat_->key.data(), plat_->key.size(), | |
53 reinterpret_cast<const unsigned char*>(data.data()), | |
54 data.size(), result.safe_buffer(), NULL); | |
55 } | |
56 | |
57 } // namespace crypto | |
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