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106 lines
3.3 KiB
C++
106 lines
3.3 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/symmetric_key.h"
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#include <stddef.h>
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#include <stdint.h>
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#include <algorithm>
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#include <utility>
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#include "base/logging.h"
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#include "base/strings/string_util.h"
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#include "crypto/openssl_util.h"
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#include "third_party/boringssl/src/include/openssl/evp.h"
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#include "third_party/boringssl/src/include/openssl/rand.h"
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namespace crypto {
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SymmetricKey::~SymmetricKey() {
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std::fill(key_.begin(), key_.end(), '\0'); // Zero out the confidential key.
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}
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// static
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std::unique_ptr<SymmetricKey> SymmetricKey::GenerateRandomKey(
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Algorithm algorithm,
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size_t key_size_in_bits) {
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DCHECK_EQ(AES, algorithm);
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// Whitelist supported key sizes to avoid accidentaly relying on
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// algorithms available in NSS but not BoringSSL and vice
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// versa. Note that BoringSSL does not support AES-192.
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if (key_size_in_bits != 128 && key_size_in_bits != 256)
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return nullptr;
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size_t key_size_in_bytes = key_size_in_bits / 8;
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DCHECK_EQ(key_size_in_bits, key_size_in_bytes * 8);
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if (key_size_in_bytes == 0)
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return nullptr;
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OpenSSLErrStackTracer err_tracer(FROM_HERE);
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std::unique_ptr<SymmetricKey> key(new SymmetricKey);
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uint8_t* key_data = reinterpret_cast<uint8_t*>(
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base::WriteInto(&key->key_, key_size_in_bytes + 1));
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int rv = RAND_bytes(key_data, static_cast<int>(key_size_in_bytes));
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return rv == 1 ? std::move(key) : nullptr;
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}
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// static
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std::unique_ptr<SymmetricKey> SymmetricKey::DeriveKeyFromPassword(
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Algorithm algorithm,
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const std::string& password,
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const std::string& salt,
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size_t iterations,
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size_t key_size_in_bits) {
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DCHECK(algorithm == AES || algorithm == HMAC_SHA1);
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if (algorithm == AES) {
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// Whitelist supported key sizes to avoid accidentaly relying on
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// algorithms available in NSS but not BoringSSL and vice
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// versa. Note that BoringSSL does not support AES-192.
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if (key_size_in_bits != 128 && key_size_in_bits != 256)
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return nullptr;
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}
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size_t key_size_in_bytes = key_size_in_bits / 8;
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DCHECK_EQ(key_size_in_bits, key_size_in_bytes * 8);
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if (key_size_in_bytes == 0)
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return nullptr;
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OpenSSLErrStackTracer err_tracer(FROM_HERE);
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std::unique_ptr<SymmetricKey> key(new SymmetricKey);
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uint8_t* key_data = reinterpret_cast<uint8_t*>(
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base::WriteInto(&key->key_, key_size_in_bytes + 1));
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int rv = PKCS5_PBKDF2_HMAC_SHA1(
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password.data(), password.length(),
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reinterpret_cast<const uint8_t*>(salt.data()), salt.length(),
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static_cast<unsigned>(iterations),
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key_size_in_bytes, key_data);
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return rv == 1 ? std::move(key) : nullptr;
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}
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// static
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std::unique_ptr<SymmetricKey> SymmetricKey::Import(Algorithm algorithm,
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const std::string& raw_key) {
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if (algorithm == AES) {
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// Whitelist supported key sizes to avoid accidentaly relying on
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// algorithms available in NSS but not BoringSSL and vice
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// versa. Note that BoringSSL does not support AES-192.
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if (raw_key.size() != 128/8 && raw_key.size() != 256/8)
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return nullptr;
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}
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std::unique_ptr<SymmetricKey> key(new SymmetricKey);
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key->key_ = raw_key;
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return key;
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}
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SymmetricKey::SymmetricKey() = default;
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} // namespace crypto
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