The standard GOST 34.__-20__ "Information technology. CRYPTOGRAPHIC DATA SECURITY. Block ciphers" is a draft version of the new Russian block ciphers.
The project includes an implementation of the block cipher Kuznechik (Kuznyechik) in Sage. This is a proof of concept of naive, over GF(28), and table implementations. It also provides additional tools including generating of tables and the MDS matrix of the linear layer.
Propositions, comments, or other improvements are welcomed.
Oleksandr Kazymyrov: okazymyrov (at) gmail.com