if OP == '0x1':
f = byts[1:2]
b = bin(f[0])[2:]
MASK = b[0]
LEN = int(b[1:], 2)
KEY = byts[2:6]
pl = byts[6:]
decrypted = [ a ^ b for (a,b) in zip(bytes(pl), cycle(bytes(KEY))) ]
print(f"#{id} FIN:{FIN} OP:{OP} MASK:{MASK} LEN:{LEN} KEY:{KEY} DEC:{pl}")