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/*
* Copyright (C) 2014 Igalia S.L. 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 "CryptoAlgorithmHMAC.h"
#if ENABLE(SUBTLE_CRYPTO)
#include "CryptoAlgorithmHmacParamsDeprecated.h"
#include "CryptoKeyHMAC.h"
#include "ExceptionCode.h"
#include "NotImplemented.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#include <wtf/CryptographicUtilities.h>
namespace WebCore {
static gnutls_mac_algorithm_t getGnutlsDigestAlgorithm(CryptoAlgorithmIdentifier hashFunction)
{
switch (hashFunction) {
case CryptoAlgorithmIdentifier::SHA_1:
return GNUTLS_MAC_SHA1;
case CryptoAlgorithmIdentifier::SHA_224:
return GNUTLS_MAC_SHA224;
case CryptoAlgorithmIdentifier::SHA_256:
return GNUTLS_MAC_SHA256;
case CryptoAlgorithmIdentifier::SHA_384:
return GNUTLS_MAC_SHA384;
case CryptoAlgorithmIdentifier::SHA_512:
return GNUTLS_MAC_SHA512;
default:
return GNUTLS_MAC_UNKNOWN;
}
}
static Vector<uint8_t> calculateSignature(gnutls_mac_algorithm_t algorithm, const Vector<uint8_t>& key, const CryptoOperationData& data)
{
size_t digestLength = gnutls_hmac_get_len(algorithm);
Vector<uint8_t> result(digestLength);
const void* keyData = key.data() ? key.data() : reinterpret_cast<const uint8_t*>("");
int ret = gnutls_hmac_fast(algorithm, keyData, key.size(), data.first, data.second, result.data());
ASSERT(ret == GNUTLS_E_SUCCESS);
UNUSED_PARAM(ret);
return result;
}
void CryptoAlgorithmHMAC::platformSign(Ref<CryptoKey>&&, Vector<uint8_t>&&, VectorCallback&&, ExceptionCallback&&, ScriptExecutionContext&, WorkQueue&)
{
notImplemented();
}
void CryptoAlgorithmHMAC::platformVerify(Ref<CryptoKey>&&, Vector<uint8_t>&&, Vector<uint8_t>&&, BoolCallback&&, ExceptionCallback&&, ScriptExecutionContext&, WorkQueue&)
{
notImplemented();
}
ExceptionOr<void> CryptoAlgorithmHMAC::platformSign(const CryptoAlgorithmHmacParamsDeprecated& parameters, const CryptoKeyHMAC& key, const CryptoOperationData& data, VectorCallback&& callback, VoidCallback&&)
{
gnutls_mac_algorithm_t algorithm = getGnutlsDigestAlgorithm(parameters.hash);
if (algorithm == GNUTLS_MAC_UNKNOWN)
return Exception { NOT_SUPPORTED_ERR };
callback(calculateSignature(algorithm, key.key(), data));
return { };
}
ExceptionOr<void> CryptoAlgorithmHMAC::platformVerify(const CryptoAlgorithmHmacParamsDeprecated& parameters, const CryptoKeyHMAC& key, const CryptoOperationData& expectedSignature, const CryptoOperationData& data, BoolCallback&& callback, VoidCallback&&)
{
gnutls_mac_algorithm_t algorithm = getGnutlsDigestAlgorithm(parameters.hash);
if (algorithm == GNUTLS_MAC_UNKNOWN)
return Exception { NOT_SUPPORTED_ERR };
Vector<uint8_t> signature = calculateSignature(algorithm, key.key(), data);
// Using a constant time comparison to prevent timing attacks.
bool result = signature.size() == expectedSignature.second && !constantTimeMemcmp(signature.data(), expectedSignature.first, signature.size());
callback(result);
return { };
}
}
#endif // ENABLE(SUBTLE_CRYPTO)
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