Examples with InvalidTrailerError sugar.free.sightparser.error.InvalidTrailerError used on opensource projects

Example 1 with InvalidTrailerError

use of sugar.free.sightparser.error.InvalidTrailerError in project SightRemote by TebbeUbben.

the class AuthLayerProcessor method onInboundMessage.

@Override
public void onInboundMessage(Object message, Pipeline pipeline) throws Exception {
    if (!(message instanceof ByteBuf))
        return;
    ByteBuf data = (ByteBuf) message;
    while (data.size() >= 37) {
        int length = data.getUInt16LE(4);
        if (data.size() < length + 8)
            return;
        try {
            AuthLayerMessage authLayerMessage = AuthLayerMessage.deserialize(data, pipeline.getLastNonceReceived(), pipeline.getDerivedKeys() != null ? pipeline.getDerivedKeys().getIncomingKey() : null);
            pipeline.setLastNonceReceived(authLayerMessage.getNonce());
            pipeline.setCommID(authLayerMessage.getCommID());
            pipeline.receive(authLayerMessage);
        } catch (InvalidNonceError | InvalidAuthCRCError | InvalidTrailerError e) {
            data.shift(data.size());
            throw e;
        }
    }
}

Example 2 with InvalidTrailerError

use of sugar.free.sightparser.error.InvalidTrailerError in project SightRemote by TebbeUbben.

the class AuthLayerMessage method deserialize.

public static AuthLayerMessage deserialize(ByteBuf data, BigInteger lastNonce, byte[] key) throws IllegalAccessException, InstantiationException, SightError {
    // Preamble
    data.shift(4);
    int packetLength = data.readUInt16LE();
    // Packet length XOR
    data.shift(2);
    byte[] crcContent = data.getBytes(packetLength - 10);
    byte[] header = data.getBytes(21);
    byte version = data.readByte();
    byte command = data.readByte();
    Class clazz = MESSAGES.get(command);
    if (clazz == null)
        throw new UnknownAuthMessageError(command);
    int dataLength = data.readUInt16LE();
    long commID = data.readUInt32LE();
    byte[] nonceTrailer = data.getBytes(13);
    byte[] nonce = data.readBytesLE(13);
    byte[] payload = data.readBytes(dataLength);
    byte[] trailer = data.readBytes(8);
    boolean crcPacket = CRCAuthLayerMessage.class.isAssignableFrom(clazz);
    BigInteger nonceInt = new BigInteger(nonce);
    if (version != VERSION) {
        throw new InvalidAuthVersionError(version, VERSION);
    } else if (lastNonce != null && lastNonce.equals(BigInteger.ZERO) && nonceInt.compareTo(lastNonce) != 1) {
        throw new InvalidNonceError(nonce, processNonce(lastNonce.add(BigInteger.ONE)));
    } else {
        if (crcPacket) {
            byte[] crcBytes = new byte[2];
            byte[] rawData = new byte[dataLength - 2];
            System.arraycopy(payload, dataLength - 2, crcBytes, 0, 2);
            System.arraycopy(payload, 0, rawData, 0, dataLength - 2);
            payload = rawData;
            int crc = (crcBytes[0] & 0xFF | (crcBytes[1] & 0xFF) << 8);
            int calculatedCRC = Cryptograph.calculateCRC(crcContent);
            if (crc != calculatedCRC)
                throw new InvalidAuthCRCError(crc, calculatedCRC);
        } else {
            payload = Cryptograph.encryptDataCTR(payload, key, nonceTrailer);
            byte[] calculatedTrailer = Cryptograph.produceCCMTag(nonceTrailer, payload, header, key);
            if (!Arrays.equals(trailer, calculatedTrailer))
                throw new InvalidTrailerError(trailer, calculatedTrailer);
        }
        AuthLayerMessage message = (AuthLayerMessage) clazz.newInstance();
        message.nonce = nonceInt;
        message.commID = commID;
        ByteBuf byteBuf = new ByteBuf(payload.length);
        byteBuf.putBytes(payload);
        message.parse(byteBuf);
        return message;
    }
}