1/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "CryptoKeyHMAC.h"
28
29#if ENABLE(SUBTLE_CRYPTO)
30
31#include "CryptoAlgorithmDescriptionBuilder.h"
32#include "CryptoAlgorithmRegistry.h"
33#include "CryptoKeyDataOctetSequence.h"
34#include <wtf/text/WTFString.h>
35
36namespace WebCore {
37
38CryptoKeyHMAC::CryptoKeyHMAC(const Vector<uint8_t>& key, CryptoAlgorithmIdentifier hash, bool extractable, CryptoKeyUsage usage)
39    : CryptoKey(CryptoAlgorithmIdentifier::HMAC, CryptoKeyType::Secret, extractable, usage)
40    , m_hash(hash)
41    , m_key(key)
42{
43}
44
45CryptoKeyHMAC::~CryptoKeyHMAC()
46{
47}
48
49PassRefPtr<CryptoKeyHMAC> CryptoKeyHMAC::generate(size_t lengthBytes, CryptoAlgorithmIdentifier hash, bool extractable, CryptoKeyUsage usages)
50{
51    if (!lengthBytes) {
52        switch (hash) {
53        case CryptoAlgorithmIdentifier::SHA_1:
54        case CryptoAlgorithmIdentifier::SHA_224:
55        case CryptoAlgorithmIdentifier::SHA_256:
56            lengthBytes = 64;
57            break;
58        case CryptoAlgorithmIdentifier::SHA_384:
59        case CryptoAlgorithmIdentifier::SHA_512:
60            lengthBytes = 128;
61            break;
62        default:
63            return nullptr;
64        }
65    }
66
67    return adoptRef(new CryptoKeyHMAC(randomData(lengthBytes), hash, extractable, usages));
68}
69
70void CryptoKeyHMAC::buildAlgorithmDescription(CryptoAlgorithmDescriptionBuilder& builder) const
71{
72    CryptoKey::buildAlgorithmDescription(builder);
73
74    auto hashDescriptionBuilder = builder.createEmptyClone();
75    hashDescriptionBuilder->add("name", CryptoAlgorithmRegistry::shared().nameForIdentifier(m_hash));
76    builder.add("hash", *hashDescriptionBuilder);
77
78    builder.add("length", m_key.size());
79}
80
81std::unique_ptr<CryptoKeyData> CryptoKeyHMAC::exportData() const
82{
83    ASSERT(extractable());
84    return CryptoKeyDataOctetSequence::create(m_key);
85}
86
87} // namespace WebCore
88
89#endif // ENABLE(SUBTLE_CRYPTO)
90