documentation: https://m2crypto.readthedocs.io/
email list: https://lists.sr.ht/~mcepl/m2crypto (subscribe via email)
discussion channel: matrix:r/m2crypto:ceplovi.cz
issue tracker: |-
https://todo.sr.ht/~mcepl/m2crypto (R/O, please
report issues via the email list).
maintainer: "Matěj Cepl"
web-Site: https://codeberg.org/mcepl/m2crypto/

M2Crypto

M2Crypto = Python + OpenSSL + SWIG

:alt: builds.sr.ht status
:target: https://builds.sr.ht/~mcepl?

NOTE: This library is currently in maintenance mode (and it has been in it since 2014 and I don’t plan to stop maintaining it anytime soon). For new applications we recommend using a more modern alternative such as PyCA/cryptography. Examples of how to migrate can be found in the documentation.

M2Crypto is a crypto and SSL toolkit for Python.

M2 stands for "me, too!"

M2Crypto comes with the following:

RSA, DSA, DH, HMACs, message digests, symmetric ciphers including AES,
TLS functionality to implement clients and servers.
Example SSL client and server programs, which are variously threading, forking or based on non-blocking socket IO.
HTTPS extensions to Python's httplib, urllib and xmlrpclib.
Unforgeable HMAC'ing AuthCookies for web session management.
FTP/TLS client and server.
S/MIME v2.
ZSmime: An S/MIME messenger for Zope.

We care a lot about stable API and all Python methods should be preserved, note however that m2. namespace is considered internal to the library and it doesn't have to be preserved. If however some change to it breaks your app, let us know and we will try to make things working for you.

And much more.

M2Crypto is released under a very liberal BSD-2-Clause licence. See LICENSES/BSD-2-Clause.txt for details.

To install, see the file INSTALL.

Look at the tests and demos for example use. Recommended reading before deploying in production is "Network Security with OpenSSL" by John Viega, Matt Messier and Pravir Chandra, ISBN 059600270X.

Note these caveats:

Possible memory leaks, because some objects need to be freed on the Python side and other objects on the C side, and these may change between OpenSSL versions. (Multiple free's lead to crashes very quickly, so these should be relatively rare.)
No memory locking/clearing for keys, passphrases, etc. because AFAIK Python does not provide the features needed. On the C (OpenSSL) side things are cleared when the Python objects are deleted.

Have fun! Your feedback is welcome.

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0.49.0

Aug 15, 2026

0.48.0

May 23, 2026

0.47.0

Feb 8, 2026

0.46.2

Oct 2, 2025

0.46.0

Oct 1, 2025

0.45.1

Apr 23, 2025

0.45.0

Apr 17, 2025

0.44.0

Feb 17, 2025

0.43.0

Oct 30, 2024

0.42.0

Aug 10, 2024

0.41.0

Feb 13, 2024

0.40.1

Oct 25, 2023

0.40.0

Oct 24, 2023

0.39.0

Jul 4, 2023

0.38.0

Jun 14, 2021

0.37.1

Dec 8, 2020

0.37.0

Dec 8, 2020

0.36.0

Jul 13, 2020

0.35.2

Jun 10, 2019

0.35.1

Jun 8, 2019

0.35.0

Jun 8, 2019

0.34.0

May 30, 2019

0.33.0

Apr 26, 2019

0.32.0

Mar 4, 2019

0.31.0

Nov 9, 2018

0.30.1

Apr 29, 2018

0.30.0

Apr 25, 2018

0.29.0

Feb 23, 2018

0.28.2

Feb 8, 2018

0.28.1

Feb 8, 2018

0.28.0

Feb 8, 2018

0.27.0

Oct 5, 2017

0.26.4

Sep 26, 2017

0.26.3

Sep 22, 2017

0.26.2

Sep 20, 2017

0.26.0

Mar 25, 2017

0.25.1

Jul 25, 2016

0.25.0

Jul 22, 2016

0.24.0

Mar 21, 2016

0.23.0

Jan 29, 2016

0.22.5

Oct 13, 2015

0.22.4

Oct 13, 2015

0.22.3

Jan 22, 2014

0.21.1

Jan 15, 2011

0.21

Jan 13, 2011

0.20.2

Oct 7, 2009

0.20.1

Aug 27, 2009

0.20

Aug 11, 2009

0.20beta1 pre-release

Jul 28, 2009

0.19.1

Oct 13, 2008

0.19

Oct 6, 2008

0.18.2

Oct 12, 2007

0.18.1

Oct 8, 2007

0.18

Jul 26, 2007

0.17

Dec 21, 2006

0.16

Mar 21, 2006

0.15

Mar 25, 2006

0.13

Mar 30, 2004

0.11

Jun 24, 2003

M2Crypto 0.49.0

M2Crypto

M2Crypto = Python + OpenSSL + SWIG

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