Gosthash

#About

This is a Java implementation of RFC6986 and GOST R 34.11-2012 It provides new java.security.Provider named "GOST" with "GOST3411-2012.512" and "GOST3411-2012.256" message digest functions for 512-bit and 256-bit version of GOST3411-2012 respectively.

This implementation was integrated into Bouncy Castle

#Usage

Here is a simple usage example to get 512-bit digest of "Hello, World!" string:

import ru.fsb.gost.GOSTProvider;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Security;
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        if (Security.getProvider("GOST") == null) {
            Security.addProvider(new GOSTProvider());
        }

        try {
            MessageDigest md = MessageDigest.getInstance("GOST3411-2012.512");
            byte[] result = md.digest("Hello, World!".getBytes());
            System.out.println(Arrays.toString(result));
        } catch (NoSuchAlgorithmException e) {
            System.out.println(e.getMessage());
        }
    }
}

#Benchmark

To build and run JMH benchmark:

gradle jmhJar
java -jar build/libs/gosthash-0.4-jmh.jar -wi 5 -i 15 -f 1 -jvmArgs "-server -XX:+AggressiveOpts"

Here are some results taken on Ubutnu 14.04 desktop with AMD FX-8320 CPU and openjdk 1.8.0_91:

| Unoptimized | Optimized | Optimized + Unrolled | | ----------- | --------- | -------------------- | | 0.101 | 1.259 | 1.963 |

The results are given in operations per second i.e. the number of times benchmark function is executed per second (more is better).

#Credit

For table optimization, which dramatically (12x) improves performance, credit goes to Oleksandr Kazymyrov. Some clarifications on how this optimization works are given in section 3 of his paper