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chromium / chromium / src / 0d8db08c32735b1fd916495227802d933b308991 / . / crypto / symmetric_key_openssl.cc
blob: e1c6fb7edede4026561ac121128416dd0398de23 [file] [log] [blame]
levin@chromium.org3b63f8f42011-03-28 01:54:15[diff] [blame]1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
joth@chromium.org70372d42010-10-22 13:12:34[diff] [blame]2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
rvargas@google.com4b559b4d2011-04-14 17:37:14[diff] [blame]5#include "crypto/symmetric_key.h"
joth@chromium.org70372d42010-10-22 13:12:34[diff] [blame]6
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]7#include <openssl/evp.h>
8#include <openssl/rand.h>
9
10#include <algorithm>
11
joth@chromium.org70372d42010-10-22 13:12:34[diff] [blame]12#include "base/logging.h"
levin@chromium.org3b63f8f42011-03-28 01:54:15[diff] [blame]13#include "base/memory/scoped_ptr.h"
avi@chromium.org0d8db082013-06-11 07:27:01[diff] [blame^]14#include "base/strings/string_util.h"
rvargas@google.com4b559b4d2011-04-14 17:37:14[diff] [blame]15#include "crypto/openssl_util.h"
joth@chromium.org70372d42010-10-22 13:12:34[diff] [blame]16
rvargas@google.com4b559b4d2011-04-14 17:37:14[diff] [blame]17namespace crypto {
joth@chromium.org70372d42010-10-22 13:12:34[diff] [blame]18
19SymmetricKey::~SymmetricKey() {
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]20 std::fill(key_.begin(), key_.end(), '\0'); // Zero out the confidential key.
joth@chromium.org70372d42010-10-22 13:12:34[diff] [blame]21}
22
23// static
24SymmetricKey* SymmetricKey::GenerateRandomKey(Algorithm algorithm,
25 size_t key_size_in_bits) {
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]26 DCHECK_EQ(AES, algorithm);
pkasting@chromium.orgfdce4782011-11-29 20:06:18[diff] [blame]27 size_t key_size_in_bytes = key_size_in_bits / 8;
28 DCHECK_EQ(key_size_in_bits, key_size_in_bytes * 8);
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]29
pkasting@chromium.orgfdce4782011-11-29 20:06:18[diff] [blame]30 if (key_size_in_bytes == 0)
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]31 return NULL;
32
joth@chromium.orgbe796bb2010-11-18 15:43:43[diff] [blame]33 OpenSSLErrStackTracer err_tracer(FROM_HERE);
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]34 scoped_ptr<SymmetricKey> key(new SymmetricKey);
35 uint8* key_data =
36 reinterpret_cast<uint8*>(WriteInto(&key->key_, key_size_in_bytes + 1));
37
pkasting@chromium.orgfdce4782011-11-29 20:06:18[diff] [blame]38 int rv = RAND_bytes(key_data, static_cast<int>(key_size_in_bytes));
joth@chromium.orgbe796bb2010-11-18 15:43:43[diff] [blame]39 return rv == 1 ? key.release() : NULL;
joth@chromium.org70372d42010-10-22 13:12:34[diff] [blame]40}
41
42// static
43SymmetricKey* SymmetricKey::DeriveKeyFromPassword(Algorithm algorithm,
44 const std::string& password,
45 const std::string& salt,
46 size_t iterations,
47 size_t key_size_in_bits) {
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]48 DCHECK(algorithm == AES || algorithm == HMAC_SHA1);
pkasting@chromium.orgfdce4782011-11-29 20:06:18[diff] [blame]49 size_t key_size_in_bytes = key_size_in_bits / 8;
50 DCHECK_EQ(key_size_in_bits, key_size_in_bytes * 8);
51
52 if (key_size_in_bytes == 0)
53 return NULL;
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]54
joth@chromium.orgbe796bb2010-11-18 15:43:43[diff] [blame]55 OpenSSLErrStackTracer err_tracer(FROM_HERE);
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]56 scoped_ptr<SymmetricKey> key(new SymmetricKey);
57 uint8* key_data =
58 reinterpret_cast<uint8*>(WriteInto(&key->key_, key_size_in_bytes + 1));
joth@chromium.orgbe796bb2010-11-18 15:43:43[diff] [blame]59 int rv = PKCS5_PBKDF2_HMAC_SHA1(password.data(), password.length(),
60 reinterpret_cast<const uint8*>(salt.data()),
61 salt.length(), iterations,
pkasting@chromium.orgfdce4782011-11-29 20:06:18[diff] [blame]62 static_cast<int>(key_size_in_bytes),
63 key_data);
joth@chromium.orgbe796bb2010-11-18 15:43:43[diff] [blame]64 return rv == 1 ? key.release() : NULL;
joth@chromium.org70372d42010-10-22 13:12:34[diff] [blame]65}
66
67// static
68SymmetricKey* SymmetricKey::Import(Algorithm algorithm,
69 const std::string& raw_key) {
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]70 scoped_ptr<SymmetricKey> key(new SymmetricKey);
71 key->key_ = raw_key;
72 return key.release();
joth@chromium.org70372d42010-10-22 13:12:34[diff] [blame]73}
74
75bool SymmetricKey::GetRawKey(std::string* raw_key) {
joth@chromium.orgac0f8be2010-11-12 12:03:54[diff] [blame]76 *raw_key = key_;
77 return true;
joth@chromium.org70372d42010-10-22 13:12:34[diff] [blame]78}
79
rvargas@google.com4b559b4d2011-04-14 17:37:14[diff] [blame]80} // namespace crypto