Write a hashing program GOST 34.11-2012 in OpenSSL C++?

Question

Cryptography

You need to write a program to encrypt data from a text file.
Use OpenSSL and hash 34.11-2012 in c++
Questions:
Is there any starter version of the program with this encryption?
Documentation for encryption on this guest?
Some info in c++

Answer 1

This is for xmoonlight , he is a great expert in implementation

Answer 2

There is something here.