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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.jcajce.provider.digest;

import org.bouncycastle.asn1.misc.MiscObjectIdentifiers;
import org.bouncycastle.crypto.digests.Blake2bDigest;
import org.bouncycastle.jcajce.provider.config.ConfigurableProvider;

public class Blake2b
{
    private Blake2b()
    {

    }

    static public class Blake2b512
        extends BCMessageDigest
        implements Cloneable
    {
        public Blake2b512()
        {
            super(new Blake2bDigest(512));
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            Blake2b512 d = (Blake2b512)super.clone();
            d.digest = new Blake2bDigest((Blake2bDigest)digest);

            return d;
        }
    }

    static public class Blake2b384
        extends BCMessageDigest
        implements Cloneable
    {
        public Blake2b384()
        {
            super(new Blake2bDigest(384));
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            Blake2b384 d = (Blake2b384)super.clone();
            d.digest = new Blake2bDigest((Blake2bDigest)digest);

            return d;
        }
    }

    static public class Blake2b256
        extends BCMessageDigest
        implements Cloneable
    {
        public Blake2b256()
        {
            super(new Blake2bDigest(256));
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            Blake2b256 d = (Blake2b256)super.clone();
            d.digest = new Blake2bDigest((Blake2bDigest)digest);

            return d;
        }
    }

    static public class Blake2b160
        extends BCMessageDigest
        implements Cloneable
    {
        public Blake2b160()
        {
            super(new Blake2bDigest(160));
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            Blake2b160 d = (Blake2b160)super.clone();
            d.digest = new Blake2bDigest((Blake2bDigest)digest);

            return d;
        }
    }

    public static class Mappings
        extends DigestAlgorithmProvider
    {
        private static final String PREFIX = Blake2b.class.getName();

        public Mappings()
        {
        }

        public void configure(ConfigurableProvider provider)
        {
            provider.addAlgorithm("MessageDigest.BLAKE2B-512", PREFIX + "$Blake2b512");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + MiscObjectIdentifiers.id_blake2b512, "BLAKE2B-512");

            provider.addAlgorithm("MessageDigest.BLAKE2B-384", PREFIX + "$Blake2b384");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + MiscObjectIdentifiers.id_blake2b384, "BLAKE2B-384");

            provider.addAlgorithm("MessageDigest.BLAKE2B-256", PREFIX + "$Blake2b256");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + MiscObjectIdentifiers.id_blake2b256, "BLAKE2B-256");

            provider.addAlgorithm("MessageDigest.BLAKE2B-160", PREFIX + "$Blake2b160");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + MiscObjectIdentifiers.id_blake2b160, "BLAKE2B-160");
        }
    }
}