New Russian national block cipher GOST R 34.12-'15, also known as Kuznechik (as in Kuzmin, Nechaev and Kompany), was introduced in 2015. New cipher features:
- SP-network structure,
- block length of 128 bits,
- 9 complete encryption rounds,
- advanced round keys scheduling.
lg15 library provides implementation for
fast block encryption, decryption, and round keys scheduling routines by
employing vector-by-matrix multiplication precomutation technique described in [no link yet],
similar to one in 64KB versions of AES.
This optimisation provides significant speed-up,
but requires 128KB of additional memory for storing precomputed tables.
Two (interchangeable) versions of implementations are provided:
Universalimplementation, which is written in pure C, andSSE2implementation, which utilises SSE2 instructions.
Configure with WITH_TESTS to build tests executables,
which evaluates implementation of encryption, decryption and keys scheduling against data from specification.
Tests can be run via CTest.
Configure with WITH_BENCHMARKS to build benchmarks executable.
All functions provided by lg15 are non-blocking thus measuring takes place in single thread.
I am working as hard as I can to make this code portable and test it on as many platforms as I can. Bug reports and pull requests are welcome.