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