113 lines
4.2 KiB
C++
113 lines
4.2 KiB
C++
/*
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* Copyright (C) 2014 Igalia S.L.
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* Copyright (C) 2016 SoftAtHome
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* Copyright (C) 2016 Apple Inc.
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* Copyright (C) 2016 Yusuke Suzuki <utatane.tea@gmail.com>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "CryptoAlgorithmHMAC.h"
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#if ENABLE(WEB_CRYPTO)
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#include "CryptoKeyHMAC.h"
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#include <pal/crypto/gcrypt/Handle.h>
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#include <wtf/CryptographicUtilities.h>
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namespace WebCore {
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static int getGCryptDigestAlgorithm(CryptoAlgorithmIdentifier hashFunction)
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{
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switch (hashFunction) {
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case CryptoAlgorithmIdentifier::SHA_1:
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return GCRY_MAC_HMAC_SHA1;
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case CryptoAlgorithmIdentifier::SHA_224:
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return GCRY_MAC_HMAC_SHA224;
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case CryptoAlgorithmIdentifier::SHA_256:
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return GCRY_MAC_HMAC_SHA256;
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case CryptoAlgorithmIdentifier::SHA_384:
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return GCRY_MAC_HMAC_SHA384;
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case CryptoAlgorithmIdentifier::SHA_512:
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return GCRY_MAC_HMAC_SHA512;
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default:
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return GCRY_MAC_NONE;
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}
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}
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static std::optional<Vector<uint8_t>> calculateSignature(int algorithm, const Vector<uint8_t>& key, const uint8_t* data, size_t dataLength)
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{
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const void* keyData = key.data() ? key.data() : reinterpret_cast<const uint8_t*>("");
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PAL::GCrypt::Handle<gcry_mac_hd_t> hd;
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gcry_error_t err = gcry_mac_open(&hd, algorithm, 0, nullptr);
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if (err)
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return std::nullopt;
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err = gcry_mac_setkey(hd, keyData, key.size());
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if (err)
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return std::nullopt;
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err = gcry_mac_write(hd, data, dataLength);
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if (err)
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return std::nullopt;
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size_t digestLength = gcry_mac_get_algo_maclen(algorithm);
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Vector<uint8_t> signature(digestLength);
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err = gcry_mac_read(hd, signature.data(), &digestLength);
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if (err)
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return std::nullopt;
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signature.resize(digestLength);
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return signature;
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}
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ExceptionOr<Vector<uint8_t>> CryptoAlgorithmHMAC::platformSign(const CryptoKeyHMAC& key, const Vector<uint8_t>& data)
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{
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auto algorithm = getGCryptDigestAlgorithm(key.hashAlgorithmIdentifier());
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if (algorithm == GCRY_MAC_NONE)
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return Exception { OperationError };
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auto result = calculateSignature(algorithm, key.key(), data.data(), data.size());
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if (!result)
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return Exception { OperationError };
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return WTFMove(*result);
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}
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ExceptionOr<bool> CryptoAlgorithmHMAC::platformVerify(const CryptoKeyHMAC& key, const Vector<uint8_t>& signature, const Vector<uint8_t>& data)
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{
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auto algorithm = getGCryptDigestAlgorithm(key.hashAlgorithmIdentifier());
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if (algorithm == GCRY_MAC_NONE)
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return Exception { OperationError };
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auto expectedSignature = calculateSignature(algorithm, key.key(), data.data(), data.size());
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if (!expectedSignature)
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return Exception { OperationError };
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// Using a constant time comparison to prevent timing attacks.
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return signature.size() == expectedSignature->size() && !constantTimeMemcmp(expectedSignature->data(), signature.data(), expectedSignature->size());
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}
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}
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#endif // ENABLE(WEB_CRYPTO)
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