mirror of
https://codeberg.org/Freeyourgadget/Gadgetbridge
synced 2024-08-28 18:15:42 +02:00
121 lines
5.3 KiB
Java
121 lines
5.3 KiB
Java
/* Copyright (C) 2024 Damien Gaignon, Martin.JM
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This file is part of Gadgetbridge.
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Gadgetbridge is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Gadgetbridge is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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package nodomain.freeyourgadget.gadgetbridge.service.devices.huawei.requests;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.UnsupportedEncodingException;
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import java.nio.ByteBuffer;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import java.security.spec.InvalidKeySpecException;
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import java.util.Arrays;
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import java.util.List;
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import nodomain.freeyourgadget.gadgetbridge.devices.huawei.HuaweiCrypto;
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import nodomain.freeyourgadget.gadgetbridge.devices.huawei.HuaweiPacket;
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import nodomain.freeyourgadget.gadgetbridge.devices.huawei.packets.DeviceConfig;
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import nodomain.freeyourgadget.gadgetbridge.service.devices.huawei.HuaweiSupportProvider;
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import nodomain.freeyourgadget.gadgetbridge.util.GB;
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import nodomain.freeyourgadget.gadgetbridge.util.StringUtils;
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public class GetAuthRequest extends Request {
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private static final Logger LOG = LoggerFactory.getLogger(GetAuthRequest.class);
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protected final byte[] clientNonce;
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protected short authVersion;
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protected byte authAlgo;
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protected byte[] doubleNonce;
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protected byte[] key = null;
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protected byte deviceSupportType;
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public GetAuthRequest(HuaweiSupportProvider support,
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Request linkParamsReq) {
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super(support);
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this.serviceId = DeviceConfig.id;
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this.commandId = DeviceConfig.Auth.id;
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this.clientNonce = HuaweiCrypto.generateNonce();
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doubleNonce = ByteBuffer.allocate(32)
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.put(((GetLinkParamsRequest)linkParamsReq).serverNonce)
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.put(clientNonce)
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.array();
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this.authVersion = paramsProvider.getAuthVersion();
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this.authAlgo = paramsProvider.getAuthAlgo();
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this.deviceSupportType = paramsProvider.getDeviceSupportType();
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this.huaweiCrypto = new HuaweiCrypto(authVersion, authAlgo, deviceSupportType);
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}
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@Override
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protected List<byte[]> createRequest() throws RequestCreationException {
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byte[] nonce;
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try {
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if (deviceSupportType == 0x02) {
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key = paramsProvider.getPinCode();
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if (authVersion == 0x02)
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key = paramsProvider.getSecretKey();
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}
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nonce = ByteBuffer.allocate(18)
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.putShort(authVersion)
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.put(clientNonce)
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.array();
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ByteBuffer digestedChallenge = ByteBuffer.wrap(huaweiCrypto.digestChallenge(key, doubleNonce));
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byte[] challenge = new byte[0x20];
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digestedChallenge.get(challenge, 0x00, 0x20);
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LOG.debug("challenge: " + GB.hexdump(challenge));
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byte[] firstKey = new byte[0x10];
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digestedChallenge.get(firstKey, 0x00, 0x10);
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paramsProvider.setFirstKey(firstKey);
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if (challenge == null)
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throw new RequestCreationException("Challenge null");
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return new DeviceConfig.Auth.Request(paramsProvider, challenge, nonce).serialize();
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} catch (HuaweiPacket.CryptoException e) {
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throw new RequestCreationException(e);
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} catch (NoSuchAlgorithmException | InvalidKeyException | InvalidKeySpecException | UnsupportedEncodingException e) {
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throw new RequestCreationException("Digest exception", e);
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}
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}
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@Override
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protected void processResponse() throws ResponseParseException {
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LOG.debug("handle Auth");
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if (!(receivedPacket instanceof DeviceConfig.Auth.Response))
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throw new ResponseTypeMismatchException(receivedPacket, DeviceConfig.Auth.Response.class);
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try {
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ByteBuffer digestedChallenge = ByteBuffer.wrap(huaweiCrypto.digestResponse(key, doubleNonce));
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byte[] expectedAnswer = new byte[0x20];
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digestedChallenge.get(expectedAnswer, 0x00, 0x20);
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LOG.debug("challenge: " + GB.hexdump(expectedAnswer));
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if (expectedAnswer == null)
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throw new ResponseParseException("Challenge null");
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byte[] actualAnswer = ((DeviceConfig.Auth.Response) receivedPacket).challengeResponse;
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if (!Arrays.equals(expectedAnswer, actualAnswer)) {
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throw new ResponseParseException("Challenge answer mismatch : "
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+ StringUtils.bytesToHex(actualAnswer)
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+ " != "
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+ StringUtils.bytesToHex(expectedAnswer)
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);
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}
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} catch (NoSuchAlgorithmException | InvalidKeyException | InvalidKeySpecException | UnsupportedEncodingException e) {
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throw new ResponseParseException("Challenge response digest exception");
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}
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}
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}
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