### In your xor program
# your keystream goes there ->
keystream = [102, 49, 48, 101, 55, ...]
keystream = bytearray(keystream)
print(keystream[:32])
# copy output, you gonna need it later
exit()

### in shitty_cipher.py
mport argparse
import sys

# comment out this shit...
#parser = argparse.ArgumentParser()
#parser.add_argument("key")
#args = parser.parse_args()

SUB = [0, 1, 1, 0, 0, 1, 0, 1]
N_B = 32
N = 8 * N_B

# Next keystream
def step(x):
    x = (x & 1) << N+1 | x << 1 | x >> N-1
    y = 0
    for i in range(N):
        y |= SUB[(x >> i) & 7] << i
    return y

# Keystream init
# comment this, you dont need it
# keystr = int.from_bytes(args.key.encode(),'little')
# instead use bytearray from your keystream
keystr = int.from_bytes(bytearray(b'...','little')
for i in range(N//2):
    keystr = step(keystr)
print(keystr.to_bytes(N_B, 'little'))
# your key ^