137 lines
5.0 KiB
C++
137 lines
5.0 KiB
C++
/*
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* Copyright (C) 2017 Metrological Group B.V.
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* Copyright (C) 2017 Igalia S.L.
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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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#include "config.h"
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#include "CryptoAlgorithmAES_KW.h"
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#if ENABLE(WEB_CRYPTO)
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#include "CryptoKeyAES.h"
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#include <pal/crypto/gcrypt/Handle.h>
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#include <pal/crypto/gcrypt/Utilities.h>
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namespace WebCore {
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static std::optional<Vector<uint8_t>> gcryptWrapKey(const Vector<uint8_t>& key, const Vector<uint8_t>& data)
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{
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// Determine the AES algorithm for the given key size.
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auto algorithm = PAL::GCrypt::aesAlgorithmForKeySize(key.size() * 8);
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if (!algorithm)
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return std::nullopt;
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// Create a new GCrypt cipher object for the AES algorithm and the AES-Wrap cipher mode.
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PAL::GCrypt::Handle<gcry_cipher_hd_t> handle;
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gcry_error_t error = gcry_cipher_open(&handle, *algorithm, GCRY_CIPHER_MODE_AESWRAP, 0);
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if (error != GPG_ERR_NO_ERROR) {
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PAL::GCrypt::logError(error);
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return std::nullopt;
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}
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// Use the given key for this cipher object.
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error = gcry_cipher_setkey(handle, key.data(), key.size());
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if (error != GPG_ERR_NO_ERROR) {
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PAL::GCrypt::logError(error);
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return std::nullopt;
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}
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// Finalize the cipher object before performing the encryption.
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error = gcry_cipher_final(handle);
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if (error != GPG_ERR_NO_ERROR) {
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PAL::GCrypt::logError(error);
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return std::nullopt;
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}
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// Perform the encryption. The provided output buffer must be 64 bits larger than the input buffer.
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Vector<uint8_t> output(data.size() + 8);
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error = gcry_cipher_encrypt(handle, output.data(), output.size(), data.data(), data.size());
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if (error != GPG_ERR_NO_ERROR) {
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PAL::GCrypt::logError(error);
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return std::nullopt;
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}
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return output;
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}
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static std::optional<Vector<uint8_t>> gcryptUnwrapKey(const Vector<uint8_t>& key, const Vector<uint8_t>& data)
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{
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// Determine the AES algorithm for the given key size.
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auto algorithm = PAL::GCrypt::aesAlgorithmForKeySize(key.size() * 8);
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if (!algorithm)
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return std::nullopt;
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// Create a new GCrypt cipher object for the AES algorithm and the AES-Wrap cipher mode.
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PAL::GCrypt::Handle<gcry_cipher_hd_t> handle;
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gcry_error_t error = gcry_cipher_open(&handle, *algorithm, GCRY_CIPHER_MODE_AESWRAP, 0);
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if (error != GPG_ERR_NO_ERROR) {
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PAL::GCrypt::logError(error);
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return std::nullopt;
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}
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// Use the given key for this cipher object.
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error = gcry_cipher_setkey(handle, key.data(), key.size());
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if (error != GPG_ERR_NO_ERROR) {
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PAL::GCrypt::logError(error);
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return std::nullopt;
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}
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// Finalize the cipher object before performing the encryption.
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error = gcry_cipher_final(handle);
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if (error != GPG_ERR_NO_ERROR) {
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PAL::GCrypt::logError(error);
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return std::nullopt;
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}
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// Perform the decryption. The output buffer may be specified 64 bits shorter than the input buffer.
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Vector<uint8_t> output(data.size() - 8);
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error = gcry_cipher_decrypt(handle, output.data(), output.size(), data.data(), data.size());
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if (error != GPG_ERR_NO_ERROR) {
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PAL::GCrypt::logError(error);
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return std::nullopt;
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}
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return output;
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}
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ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAES_KW::platformWrapKey(const CryptoKeyAES& key, const Vector<uint8_t>& data)
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{
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auto output = gcryptWrapKey(key.key(), data);
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if (!output)
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return Exception { OperationError };
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return WTFMove(*output);
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}
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ExceptionOr<Vector<uint8_t>> CryptoAlgorithmAES_KW::platformUnwrapKey(const CryptoKeyAES& key, const Vector<uint8_t>& data)
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{
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auto output = gcryptUnwrapKey(key.key(), data);
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if (!output)
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return Exception { OperationError };
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return WTFMove(*output);
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}
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} // namespace WebCore
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#endif // ENABLE(WEB_CRYPTO)
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