You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.6 KiB
49 lines
1.6 KiB
4 months ago
|
.. hazmat::
|
||
|
|
|
||
|
|
OpenSSL binding
|
||
|
|
===============
|
||
|
|
|
||
|
|
.. currentmodule:: cryptography.hazmat.bindings.openssl.binding
|
||
|
|
|
||
|
|
These are `CFFI`_ bindings to the `OpenSSL`_ C library. Cryptography supports
|
||
|
|
OpenSSL version 1.0.1 and greater.
|
||
|
|
|
||
|
|
.. class:: cryptography.hazmat.bindings.openssl.binding.Binding()
|
||
|
|
|
||
|
|
This is the exposed API for the OpenSSL bindings. It has two public
|
||
|
|
attributes:
|
||
|
|
|
||
|
|
.. attribute:: ffi
|
||
|
|
|
||
|
|
This is a ``cffi.FFI`` instance. It can be used to allocate and
|
||
|
|
otherwise manipulate OpenSSL structures.
|
||
|
|
|
||
|
|
.. attribute:: lib
|
||
|
|
|
||
|
|
This is a ``cffi`` library. It can be used to call OpenSSL functions,
|
||
|
|
and access constants.
|
||
|
|
|
||
|
|
.. classmethod:: init_static_locks
|
||
|
|
|
||
|
|
Enables the best available locking callback for OpenSSL.
|
||
|
|
See :ref:`openssl-threading`.
|
||
|
|
|
||
|
|
.. _openssl-threading:
|
||
|
|
|
||
|
|
Threading
|
||
|
|
---------
|
||
|
|
|
||
|
|
``cryptography`` enables OpenSSLs `thread safety facilities`_ in two different
|
||
|
|
ways depending on the configuration of your system. Normally the locking
|
||
|
|
callbacks provided by your Python implementation specifically for OpenSSL will
|
||
|
|
be used. However, if you have linked ``cryptography`` to a different version of
|
||
|
|
OpenSSL than that used by your Python implementation we enable an alternative
|
||
|
|
locking callback. This version is implemented in Python and so may result in
|
||
|
|
lower performance in some situations. In particular parallelism is reduced
|
||
|
|
because it has to acquire the GIL whenever any lock operations occur within
|
||
|
|
OpenSSL.
|
||
|
|
|
||
|
|
.. _`CFFI`: https://cffi.readthedocs.io
|
||
|
|
.. _`OpenSSL`: https://www.openssl.org/
|
||
|
|
.. _`thread safety facilities`: https://www.openssl.org/docs/man1.0.2/crypto/threads.html
|