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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.7 for Java 8 and later.

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package org.bouncycastle.crypto.digests;

import org.bouncycastle.crypto.CryptoServicePurpose;
import org.bouncycastle.util.Memoable;

/**
 * implementation of GOST R 34.11-2012 256-bit
 */
public final class GOST3411_2012_256Digest
    extends GOST3411_2012Digest
{
    private final static byte[] IV = {
        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
        0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01
    };

    public GOST3411_2012_256Digest(CryptoServicePurpose purpose)
    {
        super(IV, purpose);
    }
    public GOST3411_2012_256Digest()
    {
        super(IV, CryptoServicePurpose.ANY);
    }

    public GOST3411_2012_256Digest(GOST3411_2012_256Digest other)
    {
        super(IV, other.purpose);
        reset(other);
    }

    public String getAlgorithmName()
    {
        return "GOST3411-2012-256";
    }

    public int getDigestSize()
    {
        return 32;
    }

    public int doFinal(byte[] out, int outOff)
    {
        byte[] result = new byte[64];
        super.doFinal(result, 0);

        System.arraycopy(result, 32, out, outOff, 32);

        return 32;
    }

    public Memoable copy()
    {
        return new GOST3411_2012_256Digest(this);
    }
}