circuitpython/docs/library/ussl.rst

:mod:`ussl` -- SSL/TLS module
=============================

.. module:: ussl
   :synopsis: TLS/SSL wrapper for socket objects

This module provides access to Transport Layer Security (previously and
widely known as “Secure Sockets Layer”) encryption and peer authentication
facilities for network sockets, both client-side and server-side.

Functions
---------

.. function:: ssl.wrap_socket(sock, server_side=False, keyfile=None, certfile=None, cert_reqs=CERT_NONE, ca_certs=None)

   Takes a stream `sock` (usually usocket.socket instance of ``SOCK_STREAM`` type),
   and returns an instance of ssl.SSLSocket, which wraps the underlying stream in
   an SSL context. Returned object has the usual stream interface methods like
   `read()`, `write()`, etc. In MicroPython, the returned object does not expose
   socket interface and methods like `recv()`, `send()`. In particular, a
   server-side SSL socket should be created from a normal socket returned from
   `accept()` on a non-SSL listening server socket.

   Depending on the underlying module implementation for a particular board,
   some or all keyword arguments above may be not supported.

.. warning::

   Some implementations of ``ssl`` module do NOT validate server certificates,
   which makes an SSL connection established prone to man-in-the-middle attacks.

Exceptions
----------

.. data:: ssl.SSLError

   This exception does NOT exist. Instead its base class, OSError, is used.

Constants
---------

.. data:: ssl.CERT_NONE
          ssl.CERT_OPTIONAL
          ssl.CERT_REQUIRED

    Supported values for `cert_reqs` parameter.