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89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
// Copyright (c) 2012 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 <stddef.h>
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#include <algorithm>
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#include <string>
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#include "base/logging.h"
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#include "base/stl_util.h"
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#include "crypto/openssl_util.h"
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#include "crypto/secure_util.h"
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#include "crypto/symmetric_key.h"
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#include "third_party/boringssl/src/include/openssl/hmac.h"
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namespace crypto {
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HMAC::HMAC(HashAlgorithm hash_alg) : hash_alg_(hash_alg), initialized_(false) {
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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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HMAC::~HMAC() {
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// Zero out key copy.
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key_.assign(key_.size(), 0);
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base::STLClearObject(&key_);
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}
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size_t HMAC::DigestLength() const {
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switch (hash_alg_) {
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case SHA1:
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return 20;
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case SHA256:
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return 32;
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default:
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NOTREACHED();
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return 0;
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}
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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(!initialized_);
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initialized_ = true;
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key_.assign(key, key + key_length);
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return true;
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}
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bool HMAC::Init(const SymmetricKey* key) {
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return Init(key->key());
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}
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bool HMAC::Sign(base::StringPiece data,
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unsigned char* digest,
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size_t digest_length) const {
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DCHECK(initialized_);
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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(), key_.data(),
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key_.size(),
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reinterpret_cast<const unsigned char*>(data.data()),
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data.size(), result.safe_buffer(), nullptr);
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}
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bool HMAC::Verify(base::StringPiece data, base::StringPiece digest) const {
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if (digest.size() != DigestLength())
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return false;
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return VerifyTruncated(data, digest);
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}
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bool HMAC::VerifyTruncated(base::StringPiece data,
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base::StringPiece digest) const {
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if (digest.empty())
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return false;
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size_t digest_length = DigestLength();
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std::unique_ptr<unsigned char[]> computed_digest(
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new unsigned char[digest_length]);
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if (!Sign(data, computed_digest.get(), digest_length))
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return false;
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return SecureMemEqual(digest.data(), computed_digest.get(),
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std::min(digest.size(), digest_length));
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}
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} // namespace crypto
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