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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "CryptoKeyAES.h"
#if ENABLE(WEB_CRYPTO)
#include "CryptoAesKeyAlgorithm.h"
#include "CryptoAlgorithmAesKeyParams.h"
#include "CryptoAlgorithmRegistry.h"
#include "ExceptionOr.h"
#include "JsonWebKey.h"
#include <wtf/text/Base64.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
static inline bool lengthIsValid(size_t length)
{
return (length == CryptoKeyAES::s_length128) || (length == CryptoKeyAES::s_length192) || (length == CryptoKeyAES::s_length256);
}
CryptoKeyAES::CryptoKeyAES(CryptoAlgorithmIdentifier algorithm, const Vector<uint8_t>& key, bool extractable, CryptoKeyUsageBitmap usage)
: CryptoKey(algorithm, CryptoKeyType::Secret, extractable, usage)
, m_key(key)
{
ASSERT(isValidAESAlgorithm(algorithm));
}
CryptoKeyAES::CryptoKeyAES(CryptoAlgorithmIdentifier algorithm, Vector<uint8_t>&& key, bool extractable, CryptoKeyUsageBitmap usage)
: CryptoKey(algorithm, CryptoKeyType::Secret, extractable, usage)
, m_key(WTFMove(key))
{
ASSERT(isValidAESAlgorithm(algorithm));
}
CryptoKeyAES::~CryptoKeyAES() = default;
bool CryptoKeyAES::isValidAESAlgorithm(CryptoAlgorithmIdentifier algorithm)
{
return algorithm == CryptoAlgorithmIdentifier::AES_CTR
|| algorithm == CryptoAlgorithmIdentifier::AES_CBC
|| algorithm == CryptoAlgorithmIdentifier::AES_GCM
|| algorithm == CryptoAlgorithmIdentifier::AES_CFB
|| algorithm == CryptoAlgorithmIdentifier::AES_KW;
}
RefPtr<CryptoKeyAES> CryptoKeyAES::generate(CryptoAlgorithmIdentifier algorithm, size_t lengthBits, bool extractable, CryptoKeyUsageBitmap usages)
{
if (!lengthIsValid(lengthBits))
return nullptr;
return adoptRef(new CryptoKeyAES(algorithm, randomData(lengthBits / 8), extractable, usages));
}
RefPtr<CryptoKeyAES> CryptoKeyAES::importRaw(CryptoAlgorithmIdentifier algorithm, Vector<uint8_t>&& keyData, bool extractable, CryptoKeyUsageBitmap usages)
{
if (!lengthIsValid(keyData.size() * 8))
return nullptr;
return adoptRef(new CryptoKeyAES(algorithm, WTFMove(keyData), extractable, usages));
}
RefPtr<CryptoKeyAES> CryptoKeyAES::importJwk(CryptoAlgorithmIdentifier algorithm, JsonWebKey&& keyData, bool extractable, CryptoKeyUsageBitmap usages, CheckAlgCallback&& callback)
{
if (keyData.kty != "oct"_s)
return nullptr;
if (keyData.k.isNull())
return nullptr;
auto octetSequence = base64URLDecode(keyData.k);
if (!octetSequence)
return nullptr;
if (!callback(octetSequence->size() * 8, keyData.alg))
return nullptr;
if (usages && !keyData.use.isNull() && keyData.use != "enc"_s)
return nullptr;
if (keyData.key_ops && ((keyData.usages & usages) != usages))
return nullptr;
if (keyData.ext && !keyData.ext.value() && extractable)
return nullptr;
return adoptRef(new CryptoKeyAES(algorithm, WTFMove(*octetSequence), extractable, usages));
}
JsonWebKey CryptoKeyAES::exportJwk() const
{
JsonWebKey result;
result.kty = "oct"_s;
result.k = base64URLEncodeToString(m_key);
result.key_ops = usages();
result.ext = extractable();
return result;
}
ExceptionOr<size_t> CryptoKeyAES::getKeyLength(const CryptoAlgorithmParameters& parameters)
{
auto& aesParameters = downcast<CryptoAlgorithmAesKeyParams>(parameters);
if (!lengthIsValid(aesParameters.length))
return Exception { OperationError };
return aesParameters.length;
}
auto CryptoKeyAES::algorithm() const -> KeyAlgorithm
{
CryptoAesKeyAlgorithm result;
result.name = CryptoAlgorithmRegistry::singleton().name(algorithmIdentifier());
result.length = m_key.size() * 8;
return result;
}
} // namespace WebCore
#endif // ENABLE(WEB_CRYPTO)
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