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/*
* Copyright (C) 2017 Apple Inc. 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.
*/
#pragma once
#include <type_traits>
#include <wtf/HashTraits.h>
#include <wtf/Hasher.h>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
class CachedResource;
class FragmentedSharedBuffer;
struct ResourceCryptographicDigest {
static constexpr unsigned algorithmCount = 3;
enum class Algorithm : uint8_t {
SHA256 = 1 << 0,
SHA384 = 1 << 1,
SHA512 = 1 << (algorithmCount - 1),
};
// Number of bytes to hold SHA-512 digest
static constexpr size_t maximumDigestLength = 64;
Algorithm algorithm;
Vector<uint8_t> value;
bool operator==(const ResourceCryptographicDigest& other) const
{
return algorithm == other.algorithm && value == other.value;
}
};
inline void add(Hasher& hasher, const ResourceCryptographicDigest& digest)
{
add(hasher, digest.algorithm, digest.value);
}
struct EncodedResourceCryptographicDigest {
using Algorithm = ResourceCryptographicDigest::Algorithm;
Algorithm algorithm;
String digest;
};
std::optional<ResourceCryptographicDigest> parseCryptographicDigest(StringParsingBuffer<UChar>&);
std::optional<ResourceCryptographicDigest> parseCryptographicDigest(StringParsingBuffer<LChar>&);
std::optional<EncodedResourceCryptographicDigest> parseEncodedCryptographicDigest(StringParsingBuffer<UChar>&);
std::optional<EncodedResourceCryptographicDigest> parseEncodedCryptographicDigest(StringParsingBuffer<LChar>&);
std::optional<ResourceCryptographicDigest> decodeEncodedResourceCryptographicDigest(const EncodedResourceCryptographicDigest&);
ResourceCryptographicDigest cryptographicDigestForSharedBuffer(ResourceCryptographicDigest::Algorithm, const FragmentedSharedBuffer*);
ResourceCryptographicDigest cryptographicDigestForBytes(ResourceCryptographicDigest::Algorithm, const void* bytes, size_t length);
}
namespace WTF {
template<> struct DefaultHash<WebCore::ResourceCryptographicDigest> {
static unsigned hash(const WebCore::ResourceCryptographicDigest& digest)
{
return computeHash(digest);
}
static bool equal(const WebCore::ResourceCryptographicDigest& a, const WebCore::ResourceCryptographicDigest& b)
{
return a == b;
}
static const bool safeToCompareToEmptyOrDeleted = true;
};
template<> struct HashTraits<WebCore::ResourceCryptographicDigest> : GenericHashTraits<WebCore::ResourceCryptographicDigest> {
using Algorithm = WebCore::ResourceCryptographicDigest::Algorithm;
using AlgorithmUnderlyingType = typename std::underlying_type<Algorithm>::type;
static constexpr auto emptyAlgorithmValue = static_cast<Algorithm>(std::numeric_limits<AlgorithmUnderlyingType>::max());
static constexpr auto deletedAlgorithmValue = static_cast<Algorithm>(std::numeric_limits<AlgorithmUnderlyingType>::max() - 1);
static const bool emptyValueIsZero = false;
static WebCore::ResourceCryptographicDigest emptyValue()
{
return { emptyAlgorithmValue, { } };
}
static void constructDeletedValue(WebCore::ResourceCryptographicDigest& slot)
{
slot.algorithm = deletedAlgorithmValue;
}
static bool isDeletedValue(const WebCore::ResourceCryptographicDigest& slot)
{
return slot.algorithm == deletedAlgorithmValue;
}
};
}
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