Purpose
This extension is aimed at helping people who still needs a binding to libmcrypt because they need to use CAST-256 (CAST6) algorithm, in ECB mode.
As far as I know (I may be wrong at this point, feel free to correct me if it's the case), none of the other python crypto libs (either semi-native like pycrypto or Cpython like openssl) still implement this algorithm. Even libsodium, which was chosen by the PHP community as a replacement for mcrypt in php72, does not implement it.
Since I needed to decrypt some specific things that were encrypted with this algo, using python3, I created this extension to achieve that very specific goal. It is focused on CAST-256-ECB because that was my need, and I hope this will be very temporary.
I strongly advise people to upgrade both the algorithm they use (CAST-256 to AES for example) and the underlying library too (libmcrypt to openssl or libsodium).
Build the extension
Build locally
$ python3 setup.py build
Run the tests:
$ python3 setup.py test
Push to pypi
Please follow the procedure that is explained here: https://packaging.python.org/en/latest/tutorials/packaging-projects/
If you choose to rehearse using the TestPypi platorm, keep in mind they trash everything (accounts, packages) from time to time.