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

Example 1 with UnknownAuthMessageError

use of sugar.free.sightparser.error.UnknownAuthMessageError 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;
    }
}