docs: def ARC4_encrypt(key, data, skip=0):
      """Encrypt data @data with key @key, skipping @skip first bytes of the
      keystream"""
  
      algorithm = algorithms.ARC4(key)
      cipher = Cipher(algorithm, mode=None, backend=default_backend())
      encryptor = cipher.encryptor()
      if skip:
          encryptor.update(b"\x00" * skip)
      return encryptor.update(data)