Block Cipher Kuzhnechik

Implementation of "Kuznechik" aka "Kuznyechik" aka "Grasshopper" cipher in C++

General Informantion

"KUZNECHIK" = KUZmin, NECHaev I Kompaniya (Kuzmin, Nechaev and Company) "Kuznechik" [GOST3412-2015] is a symmetric block cipher based on a substitution–permutation network, though the key schedule employs a Feistel network. It has a block size of 128 bits and key length of 256 bits.

Documentation:

• GOST (in English) https://datatracker.ietf.org/doc/html/rfc7801
• GOST (in Russian) https://tc26.ru/standard/gost/GOST_R_3412-2015.pdf

Running code

1. Make sure you have CMake installed on your system. If not, download it from the official CMake website (https://cmake.org/download)
2. To compile and run this code use IDE that supports CMake or open terminal in the build directory and run

    cmake CMakeLists.txt 
    make 
    ./Kuznechik

3. The program will execute the tests and display error messages if the tests fail. If all tests pass, "All tests have been successfully passed" will be displayed.