#!/usr/bin/env python3

input_file_name = '000.LFL'
output_file_name = '000.LFL.XORed'
key = bytearray(b'\xFF')

def str_xor(data, key):
    for i in range(len(data)):
        data[i] ^= key[i % len(key)]
    return data

data = bytearray(open(input_file_name,  'rb').read())

encoded = str_xor(data, key)
open(output_file_name, 'wb').write(encoded)