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/*
* 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 "CryptoAlgorithmAESKW.h"
#include "CryptoKeyAES.h"
#include <pal/crypto/gcrypt/Handle.h>
#include <pal/crypto/gcrypt/Utilities.h>
namespace WebCore {
static std::optional<Vector<uint8_t>> gcryptWrapKey(const Vector<uint8_t>& key, const Vector<uint8_t>& data)
{
// Determine the AES algorithm for the given key size.
auto algorithm = PAL::GCrypt::aesAlgorithmForKeySize(key.size() * 8);
if (!algorithm)
return std::nullopt;
// Create a new GCrypt cipher object for the AES algorithm and the AES-Wrap cipher mode.
PAL::GCrypt::Handle<gcry_cipher_hd_t> handle;
gcry_error_t error = gcry_cipher_open(&handle, *algorithm, GCRY_CIPHER_MODE_AESWRAP, 0);
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
// Use the given key for this cipher object.
error = gcry_cipher_setkey(handle, key.data(), key.size());
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
// Finalize the cipher object before performing the encryption.
error = gcry_cipher_final(handle);
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
// Perform the encryption. The provided output buffer must be 64 bits larger than the input buffer.
Vector<uint8_t> output(data.size() + 8);
error = gcry_cipher_encrypt(handle, output.data(), output.size(), data.data(), data.size());
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
return output;
}
static std::optional<Vector<uint8_t>> gcryptUnwrapKey(const Vector<uint8_t>& key, const Vector<uint8_t>& data)
{
// Determine the AES algorithm for the given key size.
auto algorithm = PAL::GCrypt::aesAlgorithmForKeySize(key.size() * 8);
if (!algorithm)
return std::nullopt;
// Create a new GCrypt cipher object for the AES algorithm and the AES-Wrap cipher mode.
PAL::GCrypt::Handle<gcry_cipher_hd_t> handle;
gcry_error_t error = gcry_cipher_open(&handle, *algorithm, GCRY_CIPHER_MODE_AESWRAP, 0);
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
// Use the given key for this cipher object.
error = gcry_cipher_setkey(handle, key.data(), key.size());
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
// Finalize the cipher object before performing the encryption.
error = gcry_cipher_final(handle);
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
// Perform the decryption. The output buffer may be specified 64 bits shorter than the input buffer.
Vector<uint8_t> output(data.size() - 8);
error = gcry_cipher_decrypt(handle, output.data(), output.size(), data.data(), data.size());
if (error != GPG_ERR_NO_ERROR) {
PAL::GCrypt::logError(error);
return std::nullopt;
}
return output;
}
ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAESKW::platformWrapKey(const CryptoKeyAES& key, const Vector<uint8_t>& data)
{
auto output = gcryptWrapKey(key.key(), data);
if (!output)
return Exception { ExceptionCode::OperationError };
return WTFMove(*output);
}
ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAESKW::platformUnwrapKey(const CryptoKeyAES& key, const Vector<uint8_t>& data)
{
auto output = gcryptUnwrapKey(key.key(), data);
if (!output)
return Exception { ExceptionCode::OperationError };
return WTFMove(*output);
}
} // namespace WebCore
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