122 lines
4.5 KiB
C++
122 lines
4.5 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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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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#pragma once
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#include <type_traits>
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#include <wtf/HashTraits.h>
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#include <wtf/Hasher.h>
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#include <wtf/Vector.h>
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#include <wtf/text/WTFString.h>
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namespace WebCore {
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class CachedResource;
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class SharedBuffer;
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struct ResourceCryptographicDigest {
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enum class Algorithm {
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SHA256 = 1 << 0,
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SHA384 = 1 << 1,
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SHA512 = 1 << 2,
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};
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// Number of bytes to hold SHA-512 digest
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static constexpr size_t maximumDigestLength = 64;
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Algorithm algorithm;
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Vector<uint8_t> value;
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bool operator==(const ResourceCryptographicDigest& other) const
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{
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return algorithm == other.algorithm && value == other.value;
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}
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bool operator!=(const ResourceCryptographicDigest& other) const
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{
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return !(*this == other);
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}
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};
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struct EncodedResourceCryptographicDigest {
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using Algorithm = ResourceCryptographicDigest::Algorithm;
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Algorithm algorithm;
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String digest;
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};
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std::optional<ResourceCryptographicDigest> parseCryptographicDigest(StringParsingBuffer<UChar>&);
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std::optional<ResourceCryptographicDigest> parseCryptographicDigest(StringParsingBuffer<LChar>&);
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std::optional<EncodedResourceCryptographicDigest> parseEncodedCryptographicDigest(StringParsingBuffer<UChar>&);
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std::optional<EncodedResourceCryptographicDigest> parseEncodedCryptographicDigest(StringParsingBuffer<LChar>&);
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std::optional<ResourceCryptographicDigest> decodeEncodedResourceCryptographicDigest(const EncodedResourceCryptographicDigest&);
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ResourceCryptographicDigest cryptographicDigestForSharedBuffer(ResourceCryptographicDigest::Algorithm, const SharedBuffer*);
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ResourceCryptographicDigest cryptographicDigestForBytes(ResourceCryptographicDigest::Algorithm, const void* bytes, size_t length);
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}
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namespace WTF {
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template<> struct DefaultHash<WebCore::ResourceCryptographicDigest> {
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static unsigned hash(const WebCore::ResourceCryptographicDigest& digest)
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{
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return pairIntHash(intHash(static_cast<unsigned>(digest.algorithm)), StringHasher::computeHash(digest.value.data(), digest.value.size()));
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}
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static bool equal(const WebCore::ResourceCryptographicDigest& a, const WebCore::ResourceCryptographicDigest& b)
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{
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return a == b;
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}
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static const bool safeToCompareToEmptyOrDeleted = true;
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};
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template<> struct HashTraits<WebCore::ResourceCryptographicDigest> : GenericHashTraits<WebCore::ResourceCryptographicDigest> {
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using Algorithm = WebCore::ResourceCryptographicDigest::Algorithm;
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using AlgorithmUnderlyingType = typename std::underlying_type<Algorithm>::type;
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static constexpr auto emptyAlgorithmValue = static_cast<Algorithm>(std::numeric_limits<AlgorithmUnderlyingType>::max());
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static constexpr auto deletedAlgorithmValue = static_cast<Algorithm>(std::numeric_limits<AlgorithmUnderlyingType>::max() - 1);
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static const bool emptyValueIsZero = false;
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static WebCore::ResourceCryptographicDigest emptyValue()
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{
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return { emptyAlgorithmValue, { } };
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}
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static void constructDeletedValue(WebCore::ResourceCryptographicDigest& slot)
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{
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slot.algorithm = deletedAlgorithmValue;
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}
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static bool isDeletedValue(const WebCore::ResourceCryptographicDigest& slot)
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{
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return slot.algorithm == deletedAlgorithmValue;
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}
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};
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}
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