:py:mod:`cryptnoxpy.connection`
===============================

.. py:module:: cryptnoxpy.connection

.. autoapi-nested-parse::

   Module for keeping the connection to the reader.

   Sending and receiving information from the card through the reader.



Module Contents
---------------

Classes
~~~~~~~

.. autoapisummary::

   cryptnoxpy.connection.Connection




.. py:class:: Connection(index: int = 0, debug: bool = False)

   Bases: :py:obj:`contextlib.ContextDecorator`

   Connection to the reader.

   Sends and receives messages from the card using the reader.

   :param int index: Index of the reader to initialize the connection with
   :param bool debug: Show debug information during requests

   :var Card self.card: Information about the card.

   .. py:method:: _init_reader(self, index)


   .. py:method:: __del__(self)


   .. py:method:: send_apdu(self, apdu: List[int]) -> Tuple[List[int], int, int]

      Send data to the card in plain format

      :param int apdu: list of the APDU header
      :return bytes: Result of the query that was sent to the card
      :rtype: bytes

      :raises ConnectionException: Issue in the connection


   .. py:method:: send_encrypted(self, apdu: List[int], data: bytes, receive_long: bool = False) -> bytes

      Send data to the card in encrypted format

      :param int apdu: list of the APDU header
      :param data: bytes of the data payload (in clear, will be encrypted)
      :param bool receive_long:
      :return bytes: Result of the query that was sent to the card
      :rtype: bytes

      :raises CryptnoxException: General exceptions


   .. py:method:: _check_response_code(code1: int, code2: int) -> None
      :staticmethod:


   .. py:method:: _decode(self, rep: bytes, mac_value: bytes) -> bytes


   .. py:method:: _encrypt(self, apdu: List[int], data: bytes, receive_long: bool) -> Tuple[List[int], Union[int, bytes]]


   .. py:method:: _open_secure_channel(self, pairing_secret: bytes = b'', pairing_key_index: int = 0) -> None