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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 "CryptoAlgorithmAES_CBC.h"
#if ENABLE(WEB_CRYPTO)
#include "CryptoAlgorithmAesCbcCfbParams.h"
#include "CryptoKeyAES.h"
#include <CommonCrypto/CommonCrypto.h>
namespace WebCore {
static ExceptionOr<Vector<uint8_t>> transformAES_CBC(CCOperation operation, const Vector<uint8_t>& iv, const Vector<uint8_t>& key, const Vector<uint8_t>& data, CryptoAlgorithmAES_CBC::Padding padding)
{
CCOptions options = padding == CryptoAlgorithmAES_CBC::Padding::Yes ? kCCOptionPKCS7Padding : 0;
CCCryptorRef cryptor;
CCCryptorStatus status = CCCryptorCreate(operation, kCCAlgorithmAES, options, key.data(), key.size(), iv.data(), &cryptor);
if (status)
return Exception { OperationError };
Vector<uint8_t> result(CCCryptorGetOutputLength(cryptor, data.size(), true));
size_t bytesWritten;
status = CCCryptorUpdate(cryptor, data.data(), data.size(), result.data(), result.size(), &bytesWritten);
if (status)
return Exception { OperationError };
uint8_t* p = result.data() + bytesWritten;
if (padding == CryptoAlgorithmAES_CBC::Padding::Yes) {
status = CCCryptorFinal(cryptor, p, result.end() - p, &bytesWritten);
p += bytesWritten;
if (status)
return Exception { OperationError };
}
ASSERT(p <= result.end());
result.shrink(p - result.begin());
CCCryptorRelease(cryptor);
return WTFMove(result);
}
ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAES_CBC::platformEncrypt(const CryptoAlgorithmAesCbcCfbParams& parameters, const CryptoKeyAES& key, const Vector<uint8_t>& plainText, Padding padding)
{
ASSERT(parameters.ivVector().size() == kCCBlockSizeAES128 || parameters.ivVector().isEmpty());
ASSERT(padding == Padding::Yes || !(plainText.size() % kCCBlockSizeAES128));
return transformAES_CBC(kCCEncrypt, parameters.ivVector(), key.key(), plainText, padding);
}
ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAES_CBC::platformDecrypt(const CryptoAlgorithmAesCbcCfbParams& parameters, const CryptoKeyAES& key, const Vector<uint8_t>& cipherText, Padding padding)
{
ASSERT(parameters.ivVector().size() == kCCBlockSizeAES128 || parameters.ivVector().isEmpty());
ASSERT(padding == Padding::Yes || !(cipherText.size() % kCCBlockSizeAES128));
return transformAES_CBC(kCCDecrypt, parameters.ivVector(), key.key(), cipherText, padding);
}
} // namespace WebCore
#endif // ENABLE(WEB_CRYPTO)