InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        Cipher cipher;
        byte[] decrypt;
        byte[] code = new byte[4];
        Encdec.enc_uint32le(2, code, 0);
        byte[] codeHmac = getHmac(code, key.getEncoded());

        byte[] dataChecksum = new byte[KerberosConstants.CHECKSUM_SIZE];

                if ( readn(this.in, this.sbuf, 4 + SmbConstants.SMB1_HEADER_LENGTH, lenDiff) < lenDiff ) {
                    return null;
                }
                return (long) Encdec.dec_uint64le(this.sbuf, 28);
            }

            if ( this.sbuf[ 0 ] == (byte) 0x00 && this.sbuf[ 1 ] == (byte) 0x00 && ( this.sbuf[ 4 ] == (byte) 0xFF ) && this.sbuf[ 5 ] == (byte) 'S'