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/*
* Copyright (C) 2020 Sony Interactive Entertainment Inc.
*
* 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"
#include "CryptoKeyHMAC.h"
#include "OpenSSLCryptoUniquePtr.h"
#include "OpenSSLUtilities.h"
#include <openssl/evp.h>
#include <wtf/CryptographicUtilities.h>
namespace WebCore {
static std::optional<Vector<uint8_t>> calculateSignature(const EVP_MD* algorithm, const Vector<uint8_t>& key, const uint8_t* data, size_t dataLength)
{
HMACCtxPtr ctx;
if (!(ctx = HMACCtxPtr(HMAC_CTX_new())))
return std::nullopt;
if (1 != HMAC_Init_ex(ctx.get(), key.data(), key.size(), algorithm, nullptr))
return std::nullopt;
// Call update with the message
if (1 != HMAC_Update(ctx.get(), data, dataLength))
return std::nullopt;
// Finalize the DigestSign operation
Vector<uint8_t> cipherText(EVP_MAX_MD_SIZE);
unsigned len = 0;
if (1 != HMAC_Final(ctx.get(), cipherText.data(), &len))
return std::nullopt;
cipherText.shrink(len);
return cipherText;
}
ExceptionOr<Vector<uint8_t>> CryptoAlgorithmHMAC::platformSign(const CryptoKeyHMAC& key, const Vector<uint8_t>& data)
{
auto algorithm = digestAlgorithm(key.hashAlgorithmIdentifier());
if (!algorithm)
return Exception { ExceptionCode::OperationError };
auto result = calculateSignature(algorithm, key.key(), data.data(), data.size());
if (!result)
return Exception { ExceptionCode::OperationError };
return WTFMove(*result);
}
ExceptionOr<bool> CryptoAlgorithmHMAC::platformVerify(const CryptoKeyHMAC& key, const Vector<uint8_t>& signature, const Vector<uint8_t>& data)
{
auto algorithm = digestAlgorithm(key.hashAlgorithmIdentifier());
if (!algorithm)
return Exception { ExceptionCode::OperationError };
auto expectedSignature = calculateSignature(algorithm, key.key(), data.data(), data.size());
if (!expectedSignature)
return Exception { ExceptionCode::OperationError };
// Using a constant time comparison to prevent timing attacks.
return signature.size() == expectedSignature->size() && !constantTimeMemcmp(expectedSignature->span(), signature.span());
}
} // namespace WebCore
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