zelark

import time
import random
import select
import socket


def chk(data):
    x = sum(a + b * 256 for a, b in zip(data[::2], data[1::2] + b'\x00')) & 0xFFFFFFFF
    x = (x >> 16) + (x & 0xFFFF)
    x = (x >> 16) + (x & 0xFFFF)