Officially qarma64 advices to use M4,2 = Q4,2

[Daniel-Bodden]

Great to find a Python implementation of the cipher Qarma.

In the publication of Qarma (https://eprint.iacr.org/2016/444.pdf) they check 3 MC variants: MC4,1 MC4,2 and MC4.3. On page 14 they choose for MC4,2. Maybe you want to add MC4,2 to the Python implementation.

qarma64-python/qarma.py

Line 67 in 2f7b8f5

UsedMixColumns = MixColumns_M43

[dkales]

Hi,

this implementation is older than this newest version of the Qarma paper.
See https://eprint.iacr.org/eprint-bin/getfile.pl?entry=2016/444&version=20160506:075619&file=444.pdf, there the official recommendation was still MC4,3.

I have not used this implementation in a long time, and have no real use for it at the moment. Its original use-case was to help with some cryptanalysis on paper, so the performance and interface in general are not that great.

Feel free to fork the implementation and add the recommended variant as a pull request, I don't really have time or urgency to do so at the moment, sorry.