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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.
*/
#include "config.h"
#include "ResourceCryptographicDigest.h"
#include "ParsingUtilities.h"
#include <pal/crypto/CryptoDigest.h>
#include <wtf/text/Base64.h>
namespace WebCore {
template<typename CharacterType>
static bool parseHashAlgorithmAdvancingPosition(const CharacterType*& position, const CharacterType* end, ResourceCryptographicDigest::Algorithm& algorithm)
{
// FIXME: This would be much cleaner with a lookup table of pairs of label / algorithm enum values, but I can't
// figure out how to keep the labels compiletime strings for skipExactlyIgnoringASCIICase.
if (skipExactlyIgnoringASCIICase(position, end, "sha256")) {
algorithm = ResourceCryptographicDigest::Algorithm::SHA256;
return true;
}
if (skipExactlyIgnoringASCIICase(position, end, "sha384")) {
algorithm = ResourceCryptographicDigest::Algorithm::SHA384;
return true;
}
if (skipExactlyIgnoringASCIICase(position, end, "sha512")) {
algorithm = ResourceCryptographicDigest::Algorithm::SHA512;
return true;
}
return false;
}
template<typename CharacterType>
static std::optional<ResourceCryptographicDigest> parseCryptographicDigestImpl(const CharacterType*& position, const CharacterType* end)
{
if (position == end)
return std::nullopt;
ResourceCryptographicDigest::Algorithm algorithm;
if (!parseHashAlgorithmAdvancingPosition(position, end, algorithm))
return std::nullopt;
if (!skipExactly<CharacterType>(position, end, '-'))
return std::nullopt;
const CharacterType* beginHashValue = position;
skipWhile<CharacterType, isBase64OrBase64URLCharacter>(position, end);
skipExactly<CharacterType>(position, end, '=');
skipExactly<CharacterType>(position, end, '=');
if (position == beginHashValue)
return std::nullopt;
Vector<uint8_t> digest;
StringView hashValue(beginHashValue, position - beginHashValue);
if (!base64Decode(hashValue, digest, Base64ValidatePadding)) {
if (!base64URLDecode(hashValue, digest))
return std::nullopt;
}
return ResourceCryptographicDigest { algorithm, WTFMove(digest) };
}
std::optional<ResourceCryptographicDigest> parseCryptographicDigest(const UChar*& begin, const UChar* end)
{
return parseCryptographicDigestImpl(begin, end);
}
std::optional<ResourceCryptographicDigest> parseCryptographicDigest(const LChar*& begin, const LChar* end)
{
return parseCryptographicDigestImpl(begin, end);
}
template<typename CharacterType>
static std::optional<EncodedResourceCryptographicDigest> parseEncodedCryptographicDigestImpl(const CharacterType*& position, const CharacterType* end)
{
if (position == end)
return std::nullopt;
EncodedResourceCryptographicDigest::Algorithm algorithm;
if (!parseHashAlgorithmAdvancingPosition(position, end, algorithm))
return std::nullopt;
if (!skipExactly<CharacterType>(position, end, '-'))
return std::nullopt;
const CharacterType* beginHashValue = position;
skipWhile<CharacterType, isBase64OrBase64URLCharacter>(position, end);
skipExactly<CharacterType>(position, end, '=');
skipExactly<CharacterType>(position, end, '=');
if (position == beginHashValue)
return std::nullopt;
return EncodedResourceCryptographicDigest { algorithm, String(beginHashValue, position - beginHashValue) };
}
std::optional<EncodedResourceCryptographicDigest> parseEncodedCryptographicDigest(const UChar*& begin, const UChar* end)
{
return parseEncodedCryptographicDigestImpl(begin, end);
}
std::optional<EncodedResourceCryptographicDigest> parseEncodedCryptographicDigest(const LChar*& begin, const LChar* end)
{
return parseEncodedCryptographicDigestImpl(begin, end);
}
std::optional<ResourceCryptographicDigest> decodeEncodedResourceCryptographicDigest(const EncodedResourceCryptographicDigest& encodedDigest)
{
Vector<uint8_t> digest;
if (!base64Decode(encodedDigest.digest, digest, Base64ValidatePadding)) {
if (!base64URLDecode(encodedDigest.digest, digest))
return std::nullopt;
}
return ResourceCryptographicDigest { encodedDigest.algorithm, WTFMove(digest) };
}
static PAL::CryptoDigest::Algorithm toCryptoDigestAlgorithm(ResourceCryptographicDigest::Algorithm algorithm)
{
switch (algorithm) {
case ResourceCryptographicDigest::Algorithm::SHA256:
return PAL::CryptoDigest::Algorithm::SHA_256;
case ResourceCryptographicDigest::Algorithm::SHA384:
return PAL::CryptoDigest::Algorithm::SHA_384;
case ResourceCryptographicDigest::Algorithm::SHA512:
return PAL::CryptoDigest::Algorithm::SHA_512;
}
ASSERT_NOT_REACHED();
return PAL::CryptoDigest::Algorithm::SHA_512;
}
ResourceCryptographicDigest cryptographicDigestForBytes(ResourceCryptographicDigest::Algorithm algorithm, const char* bytes, size_t length)
{
auto cryptoDigest = PAL::CryptoDigest::create(toCryptoDigestAlgorithm(algorithm));
cryptoDigest->addBytes(bytes, length);
return { algorithm, cryptoDigest->computeHash() };
}
}
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