code: def set_outbound_cipher(
          self,
          block_engine,
          block_size,
          mac_engine,
          mac_size,
          mac_key,
          sdctr=False,
      ):
          
          self.__block_engine_out = block_engine
          self.__sdctr_out = sdctr
          self.__block_size_out = block_size
          self.__mac_engine_out = mac_engine
          self.__mac_size_out = mac_size
          self.__mac_key_out = mac_key
          self.__sent_bytes = 0
          self.__sent_packets = 0
          # wait until the reset happens in both directions before clearing
          # rekey flag
          self.__init_count |= 1
          if self.__init_count == 3:
              self.__init_count = 0
              self.__need_rekey = False
docs: Switch outbound data cipher.