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/*
* Copyright (C) 2014 Igalia S.L.
* Copyright (C) 2016 SoftAtHome
* Copyright (C) 2016 Apple Inc.
* Copyright (C) 2016 Yusuke Suzuki <utatane.tea@gmail.com>.
*
* 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 "ScriptExecutionContext.h"
#include <gcrypt.h>
#include <wtf/CryptographicUtilities.h>
namespace WebCore {
static int getGCryptDigestAlgorithm(CryptoAlgorithmIdentifier hashFunction)
{
switch (hashFunction) {
case CryptoAlgorithmIdentifier::SHA_1:
return GCRY_MAC_HMAC_SHA1;
case CryptoAlgorithmIdentifier::SHA_224:
return GCRY_MAC_HMAC_SHA224;
case CryptoAlgorithmIdentifier::SHA_256:
return GCRY_MAC_HMAC_SHA256;
case CryptoAlgorithmIdentifier::SHA_384:
return GCRY_MAC_HMAC_SHA384;
case CryptoAlgorithmIdentifier::SHA_512:
return GCRY_MAC_HMAC_SHA512;
default:
return GCRY_MAC_NONE;
}
}
static std::optional<Vector<uint8_t>> calculateSignature(int algorithm, const Vector<uint8_t>& key, const uint8_t* data, size_t dataLength)
{
size_t digestLength = gcry_mac_get_algo_maclen(algorithm);
const void* keyData = key.data() ? key.data() : reinterpret_cast<const uint8_t*>("");
bool result = false;
Vector<uint8_t> signature;
gcry_mac_hd_t hd;
gcry_error_t err;
err = gcry_mac_open(&hd, algorithm, 0, nullptr);
if (err)
goto cleanup;
err = gcry_mac_setkey(hd, keyData, key.size());
if (err)
goto cleanup;
err = gcry_mac_write(hd, data, dataLength);
if (err)
goto cleanup;
signature.resize(digestLength);
err = gcry_mac_read(hd, signature.data(), &digestLength);
if (err)
goto cleanup;
signature.resize(digestLength);
result = true;
cleanup:
if (hd)
gcry_mac_close(hd);
if (!result)
return std::nullopt;
return WTFMove(signature);
}
static std::optional<Vector<uint8_t>> calculateSignature(int algorithm, const Vector<uint8_t>& key, const CryptoOperationData& data)
{
return calculateSignature(algorithm, key, data.first, data.second);
}
void CryptoAlgorithmHMAC::platformSign(Ref<CryptoKey>&& key, Vector<uint8_t>&& data, VectorCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext& context, WorkQueue& workQueue)
{
context.ref();
workQueue.dispatch([key = WTFMove(key), data = WTFMove(data), callback = WTFMove(callback), exceptionCallback = WTFMove(exceptionCallback), &context]() mutable {
auto& hmacKey = downcast<CryptoKeyHMAC>(key.get());
auto algorithm = getGCryptDigestAlgorithm(hmacKey.hashAlgorithmIdentifier());
if (algorithm != GCRY_MAC_NONE) {
auto result = calculateSignature(algorithm, hmacKey.key(), data.data(), data.size());
if (result) {
// We should only dereference callbacks after being back to the Document/Worker threads.
context.postTask([callback = WTFMove(callback), result = WTFMove(*result), exceptionCallback = WTFMove(exceptionCallback)](ScriptExecutionContext& context) {
callback(result);
context.deref();
});
return;
}
}
// We should only dereference callbacks after being back to the Document/Worker threads.
context.postTask([exceptionCallback = WTFMove(exceptionCallback), callback = WTFMove(callback)](ScriptExecutionContext& context) {
exceptionCallback(OperationError);
context.deref();
});
});
}
void CryptoAlgorithmHMAC::platformVerify(Ref<CryptoKey>&& key, Vector<uint8_t>&& signature, Vector<uint8_t>&& data, BoolCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext& context, WorkQueue& workQueue)
{
context.ref();
workQueue.dispatch([key = WTFMove(key), signature = WTFMove(signature), data = WTFMove(data), callback = WTFMove(callback), exceptionCallback = WTFMove(exceptionCallback), &context]() mutable {
auto& hmacKey = downcast<CryptoKeyHMAC>(key.get());
auto algorithm = getGCryptDigestAlgorithm(hmacKey.hashAlgorithmIdentifier());
if (algorithm != GCRY_MAC_NONE) {
auto expectedSignature = calculateSignature(algorithm, hmacKey.key(), data.data(), data.size());
if (expectedSignature) {
// Using a constant time comparison to prevent timing attacks.
bool result = signature.size() == expectedSignature->size() && !constantTimeMemcmp(expectedSignature->data(), signature.data(), expectedSignature->size());
// We should only dereference callbacks after being back to the Document/Worker threads.
context.postTask([callback = WTFMove(callback), result, exceptionCallback = WTFMove(exceptionCallback)](ScriptExecutionContext& context) {
callback(result);
context.deref();
});
return;
}
}
// We should only dereference callbacks after being back to the Document/Worker threads.
context.postTask([exceptionCallback = WTFMove(exceptionCallback), callback = WTFMove(callback)](ScriptExecutionContext& context) {
exceptionCallback(OperationError);
context.deref();
});
});
}
ExceptionOr<void> CryptoAlgorithmHMAC::platformSign(const CryptoAlgorithmHmacParamsDeprecated& parameters, const CryptoKeyHMAC& key, const CryptoOperationData& data, VectorCallback&& callback, VoidCallback&& failureCallback)
{
int algorithm = getGCryptDigestAlgorithm(parameters.hash);
if (algorithm == GCRY_MAC_NONE)
return Exception { NOT_SUPPORTED_ERR };
auto signature = calculateSignature(algorithm, key.key(), data);
if (signature)
callback(*signature);
else
failureCallback();
return { };
}
ExceptionOr<void> CryptoAlgorithmHMAC::platformVerify(const CryptoAlgorithmHmacParamsDeprecated& parameters, const CryptoKeyHMAC& key, const CryptoOperationData& expectedSignature, const CryptoOperationData& data, BoolCallback&& callback, VoidCallback&& failureCallback)
{
int algorithm = getGCryptDigestAlgorithm(parameters.hash);
if (algorithm == GCRY_MAC_NONE)
return Exception { NOT_SUPPORTED_ERR };
auto signature = calculateSignature(algorithm, key.key(), data);
if (!signature) {
failureCallback();
return { };
}
// Using a constant time comparison to prevent timing attacks.
bool result = signature.value().size() == expectedSignature.second && !constantTimeMemcmp(signature.value().data(), expectedSignature.first, signature.value().size());
callback(result);
return { };
}
}
#endif // ENABLE(SUBTLE_CRYPTO)
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