logging in to a server - xale/iTetrinet GitHub Wiki

To log into a tetrifast server with a nickname of TestUser, the string we have to send to the server is

tetrifaster TestUser 1.13

This string has to be encoded as exemplified in the following (python) script. Some pages claim that you have to use the server IP for deriving h, but most servers guess h anyway and don't care what IP it comes from or goes to. This script is using the IP 209.52.144.98 as the server IP.

ip = [209, 52, 144, 98]  # list of ints
reg_str = 'tetrifaster TestUser 1.13'
h = str(54 * ip[0] + 41 * ip[1] + 29 * ip[2] + 17 * ip[3])
dec = randrange(256)  # random value between 0 <= x < 256
encoded = '{:02X}'.format(dec)
for i, c in enumerate(reg_str):
    dec = ((dec + ord(c)) % 255) ^ ord(h[i % len(h)])
    encoded += '{:02X}'.format(dec)

For an initial random value of dec=128, this yields the encoded string 80C512B4114A81DB7DC71DBEE70E4588CD1ABF13B5E42F6F96F9.