Fast implementation of cryptographic hash function defined in the Russian national standard GOST R 34.11-2012
For examples see main.cpp
You can read about Streebog here:
https://en.wikipedia.org/wiki/Streebog
https://ru.wikisource.org/wiki/%D0%93%D0%9E%D0%A1%D0%A2_%D0%A0_34.11%E2%80%942012