57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "crypto/hmac.h"
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#include <openssl/hmac.h>
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#include <stddef.h>
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#include <algorithm>
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#include <vector>
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#include "base/logging.h"
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#include "base/memory/scoped_ptr.h"
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#include "base/stl_util.h"
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#include "crypto/openssl_util.h"
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namespace crypto {
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struct HMACPlatformData {
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std::vector<unsigned char> key;
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};
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HMAC::HMAC(HashAlgorithm hash_alg) : hash_alg_(hash_alg) {
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// Only SHA-1 and SHA-256 hash algorithms are supported now.
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DCHECK(hash_alg_ == SHA1 || hash_alg_ == SHA256);
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}
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bool HMAC::Init(const unsigned char* key, size_t key_length) {
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// Init must not be called more than once on the same HMAC object.
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DCHECK(!plat_);
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plat_.reset(new HMACPlatformData());
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plat_->key.assign(key, key + key_length);
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return true;
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}
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HMAC::~HMAC() {
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if (plat_) {
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// Zero out key copy.
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plat_->key.assign(plat_->key.size(), 0);
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STLClearObject(&plat_->key);
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}
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}
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bool HMAC::Sign(const base::StringPiece& data,
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unsigned char* digest,
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size_t digest_length) const {
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DCHECK(plat_); // Init must be called before Sign.
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ScopedOpenSSLSafeSizeBuffer<EVP_MAX_MD_SIZE> result(digest, digest_length);
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return !!::HMAC(hash_alg_ == SHA1 ? EVP_sha1() : EVP_sha256(),
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plat_->key.data(), plat_->key.size(),
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reinterpret_cast<const unsigned char*>(data.data()),
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data.size(), result.safe_buffer(), NULL);
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}
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} // namespace crypto
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