gistfile1.txt

def key_bits():
  while True:
    for byte in key:
      for i in range(8):
        yield (byte >> i) & 1
key_bits = key_bits()


state = [0, 1] * 512
mid = int(len(state) / 2)


# 2^16 rounds
for _ in range(2 ** 16):
  l = state[:mid]
  r = state[mid:]
  state = []


  while l or r:
    if next(key_bits):
      state.append(l.pop())
      state.append(r.pop())
    else:
      state.append(r.pop())
      state.append(l.pop())
state = list(state)[:512]