keygen.py

from random import randint


rn = [randint(0, 255) for _ in range(14)]
rn[1] = 0xE7
rn[5] = 0x03

arg2 = [0xc, 6]
arg3 = [3, 0xf3]
for i in range(2):
    a1 = 0
    for j in range(4):
        a1 <<= 8
        a1 += rn[i * 4 + j]
    rn[9+3*i] = ((a1 >> arg2[i]) & 0xff) ^ ((a1 & 0xff) | arg3[i])

rs = ''
for i in range(14):
    rs += f'{rn[i]:02X}'
    if i % 2:
        rs += '-'

cx = 0x42
dx = 0xBE
for s in rs:
    if s != '-':
        dx += ord(s)
        if dx > 0xFF:
            dx -= 0xFF
        cx += dx
        if cx > 0xFF:
            cx -= 0xFF

rs += f'{cx:02X}{dx:02X}'
print(rs)