1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/base/hmac_mac.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,69 @@
1.4 +// Copyright (c) 2008 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "base/hmac.h"
1.9 +
1.10 +#include <CommonCrypto/CommonHMAC.h>
1.11 +
1.12 +#include "base/logging.h"
1.13 +
1.14 +namespace base {
1.15 +
1.16 +struct HMACPlatformData {
1.17 + std::string key_;
1.18 +};
1.19 +
1.20 +HMAC::HMAC(HashAlgorithm hash_alg)
1.21 + : hash_alg_(hash_alg), plat_(new HMACPlatformData()) {
1.22 + // Only SHA-1 digest is supported now.
1.23 + DCHECK(hash_alg_ == SHA1);
1.24 +}
1.25 +
1.26 +bool HMAC::Init(const unsigned char *key, int key_length) {
1.27 + if (!plat_->key_.empty()) {
1.28 + // Init must not be called more than once on the same HMAC object.
1.29 + NOTREACHED();
1.30 + return false;
1.31 + }
1.32 +
1.33 + plat_->key_.assign(reinterpret_cast<const char*>(key), key_length);
1.34 +
1.35 + return true;
1.36 +}
1.37 +
1.38 +HMAC::~HMAC() {
1.39 + // Zero out key copy.
1.40 + plat_->key_.assign(plat_->key_.length(), std::string::value_type());
1.41 + plat_->key_.clear();
1.42 + plat_->key_.reserve(0);
1.43 +}
1.44 +
1.45 +bool HMAC::Sign(const std::string& data,
1.46 + unsigned char* digest,
1.47 + int digest_length) {
1.48 + CCHmacAlgorithm algorithm;
1.49 + int algorithm_digest_length;
1.50 + switch (hash_alg_) {
1.51 + case SHA1:
1.52 + algorithm = kCCHmacAlgSHA1;
1.53 + algorithm_digest_length = CC_SHA1_DIGEST_LENGTH;
1.54 + break;
1.55 + default:
1.56 + NOTREACHED();
1.57 + return false;
1.58 + }
1.59 +
1.60 + if (digest_length < algorithm_digest_length) {
1.61 + NOTREACHED();
1.62 + return false;
1.63 + }
1.64 +
1.65 + CCHmac(algorithm,
1.66 + plat_->key_.data(), plat_->key_.length(), data.data(), data.length(),
1.67 + digest);
1.68 +
1.69 + return true;
1.70 +}
1.71 +
1.72 +} // namespace base
