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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
* Copyright (C) 2017 Metrological Group B.V.
* Copyright (C) 2017 Igalia S.L.
*
* 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 "CryptoAlgorithmRSA_PSS.h"
#include "CryptoAlgorithmRsaPssParams.h"
#include "CryptoKeyRSA.h"
#include "GCryptUtilities.h"
namespace WebCore {
static std::optional<Vector<uint8_t>> gcryptSign(gcry_sexp_t keySexp, const Vector<uint8_t>& data, CryptoAlgorithmIdentifier hashAlgorithmIdentifier, size_t saltLength, size_t keySizeInBytes)
{
// Perform digest operation with the specified algorithm on the given data.
Vector<uint8_t> dataHash;
{
auto digestAlgorithm = hashCryptoDigestAlgorithm(hashAlgorithmIdentifier);
if (!digestAlgorithm)
return std::nullopt;
auto digest = PAL::CryptoDigest::create(*digestAlgorithm);
if (!digest)
return std::nullopt;
digest->addBytes(data);
dataHash = digest->computeHash();
}
// Construct the `data` s-expression that contains PSS-padded hashed data.
PAL::GCrypt::Handle<gcry_sexp_t> dataSexp;
{
auto shaAlgorithm = hashAlgorithmName(hashAlgorithmIdentifier);
if (shaAlgorithm.isNull())
return std::nullopt;
gcry_error_t error = gcry_sexp_build(&dataSexp, nullptr, "(data(flags pss)(salt-length %u)(hash %s %b))",
saltLength, shaAlgorithm.characters(), dataHash.size(), dataHash.data());
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
}
// Perform the PK signing, retrieving a `sig-val` s-expression of the following form:
// (sig-val
// (rsa
// (s s-mpi)))
PAL::GCrypt::Handle<gcry_sexp_t> signatureSexp;
gcry_error_t error = gcry_pk_sign(&signatureSexp, dataSexp, keySexp);
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
// Retrieve MPI data of the embedded `s` integer.
PAL::GCrypt::Handle<gcry_sexp_t> sSexp(gcry_sexp_find_token(signatureSexp, "s", 0));
if (!sSexp)
return std::nullopt;
return mpiZeroPrefixedData(sSexp, keySizeInBytes);
}
static std::optional<bool> gcryptVerify(gcry_sexp_t keySexp, const Vector<uint8_t>& signature, const Vector<uint8_t>& data, CryptoAlgorithmIdentifier hashAlgorithmIdentifier, size_t saltLength)
{
// Perform digest operation with the specified algorithm on the given data.
Vector<uint8_t> dataHash;
{
auto digestAlgorithm = hashCryptoDigestAlgorithm(hashAlgorithmIdentifier);
if (!digestAlgorithm)
return std::nullopt;
auto digest = PAL::CryptoDigest::create(*digestAlgorithm);
if (!digest)
return std::nullopt;
digest->addBytes(data);
dataHash = digest->computeHash();
}
// Construct the `sig-val` s-expression that contains the signature data.
PAL::GCrypt::Handle<gcry_sexp_t> signatureSexp;
gcry_error_t error = gcry_sexp_build(&signatureSexp, nullptr, "(sig-val(rsa(s %b)))",
signature.size(), signature.data());
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
// Construct the `data` s-expression that contains PSS-padded hashed data.
PAL::GCrypt::Handle<gcry_sexp_t> dataSexp;
{
auto shaAlgorithm = hashAlgorithmName(hashAlgorithmIdentifier);
if (shaAlgorithm.isNull())
return std::nullopt;
error = gcry_sexp_build(&dataSexp, nullptr, "(data(flags pss)(salt-length %u)(hash %s %b))",
saltLength, shaAlgorithm.characters(), dataHash.size(), dataHash.data());
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
}
// Perform the PK verification. We report success if there's no error returned, or
// a failure in any other case. OperationError should not be returned at this point,
// avoiding spilling information about the exact cause of verification failure.
error = gcry_pk_verify(signatureSexp, dataSexp, keySexp);
return { error == GPG_ERR_NO_ERROR };
}
ExceptionOr<Vector<uint8_t>> CryptoAlgorithmRSA_PSS::platformSign(const CryptoAlgorithmRsaPssParams& parameters, const CryptoKeyRSA& key, const Vector<uint8_t>& data)
{
RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(!(key.keySizeInBits() % 8));
auto output = gcryptSign(key.platformKey(), data, key.hashAlgorithmIdentifier(), parameters.saltLength, key.keySizeInBits() / 8);
if (!output)
return Exception { ExceptionCode::OperationError };
return WTFMove(*output);
}
ExceptionOr<bool> CryptoAlgorithmRSA_PSS::platformVerify(const CryptoAlgorithmRsaPssParams& parameters, const CryptoKeyRSA& key, const Vector<uint8_t>& signature, const Vector<uint8_t>& data)
{
auto output = gcryptVerify(key.platformKey(), signature, data, key.hashAlgorithmIdentifier(), parameters.saltLength);
if (!output)
return Exception { ExceptionCode::OperationError };
return WTFMove(*output);
}
} // namespace WebCore
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