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circuitpython/docs/library/ussl.rst

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:mod:`ussl` -- SSL/TLS module
=============================
.. include:: ../templates/unsupported_in_circuitpython.inc
.. module:: ussl
:synopsis: TLS/SSL wrapper for socket objects
|see_cpython_module| :mod:`cpython:ssl`.
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:: ussl.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
:meth:`~usocket.socket.accept()` on a non-SSL listening server socket.
Depending on the underlying module implementation in a particular
``MicroPython port``, some or all keyword arguments above may be not supported.
.. warning::
Some implementations of ``ussl`` 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:: ussl.CERT_NONE
ussl.CERT_OPTIONAL
ussl.CERT_REQUIRED
Supported values for *cert_reqs* parameter.