hmac_openssl.cc revision ddb351dbec246cf1fab5ec20d2d5520909041de1
1ddb351dbec246cf1fab5ec20d2d5520909041de1Kristian Monsen// Copyright (c) 2011 The Chromium Authors. All rights reserved. 2513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch// Use of this source code is governed by a BSD-style license that can be 3513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch// found in the LICENSE file. 4513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 5ddb351dbec246cf1fab5ec20d2d5520909041de1Kristian Monsen#include "crypto/hmac.h" 6513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 7513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch#include <openssl/hmac.h> 8513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 9513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch#include <algorithm> 10513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch#include <vector> 11513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 12513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch#include "base/logging.h" 13ddb351dbec246cf1fab5ec20d2d5520909041de1Kristian Monsen#include "base/memory/scoped_ptr.h" 14513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch#include "base/stl_util-inl.h" 15ddb351dbec246cf1fab5ec20d2d5520909041de1Kristian Monsen#include "crypto/openssl_util.h" 16513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 17ddb351dbec246cf1fab5ec20d2d5520909041de1Kristian Monsennamespace crypto { 18513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 19513209b27ff55e2841eac0e4120199c23acce758Ben Murdochstruct HMACPlatformData { 20513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch std::vector<unsigned char> key; 21513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch}; 22513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 23513209b27ff55e2841eac0e4120199c23acce758Ben MurdochHMAC::HMAC(HashAlgorithm hash_alg) 24513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch : hash_alg_(hash_alg), plat_(new HMACPlatformData()) { 25513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch // Only SHA-1 and SHA-256 hash algorithms are supported now. 26513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch DCHECK(hash_alg_ == SHA1 || hash_alg_ == SHA256); 27513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch} 28513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 29513209b27ff55e2841eac0e4120199c23acce758Ben Murdochbool HMAC::Init(const unsigned char* key, int key_length) { 30513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch // Init must not be called more than once on the same HMAC object. 31513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch DCHECK(plat_->key.empty()); 32513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 33513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch plat_->key.assign(key, key + key_length); 34513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch return true; 35513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch} 36513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 37513209b27ff55e2841eac0e4120199c23acce758Ben MurdochHMAC::~HMAC() { 38513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch // Zero out key copy. 39513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch plat_->key.assign(plat_->key.size(), 0); 40513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch STLClearObject(&plat_->key); 41513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch} 42513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 43513209b27ff55e2841eac0e4120199c23acce758Ben Murdochbool HMAC::Sign(const std::string& data, 44513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch unsigned char* digest, 45513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch int digest_length) { 46513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch DCHECK_GE(digest_length, 0); 47513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch DCHECK(!plat_->key.empty()); // Init must be called before Sign. 48513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 49513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch ScopedOpenSSLSafeSizeBuffer<EVP_MAX_MD_SIZE> result(digest, digest_length); 50513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch return ::HMAC(hash_alg_ == SHA1 ? EVP_sha1() : EVP_sha256(), 51513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch &plat_->key[0], plat_->key.size(), 52513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch reinterpret_cast<const unsigned char*>(data.data()), 53513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch data.size(), 54513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch result.safe_buffer(), NULL); 55513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch} 56513209b27ff55e2841eac0e4120199c23acce758Ben Murdoch 57ddb351dbec246cf1fab5ec20d2d5520909041de1Kristian Monsen} // namespace crypto 58