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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.jcajce.provider.digest;

import org.bouncycastle.asn1.misc.MiscObjectIdentifiers;
import org.bouncycastle.crypto.digests.Blake2sDigest;
import org.bouncycastle.jcajce.provider.config.ConfigurableProvider;

public class Blake2s
{
    private Blake2s()
    {

    }

    static public class Blake2s256
        extends BCMessageDigest
        implements Cloneable
    {
        public Blake2s256()
        {
            super(new Blake2sDigest(256));
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            Blake2s256 d = (Blake2s256)super.clone();
            d.digest = new Blake2sDigest((Blake2sDigest)digest);

            return d;
        }
    }

    static public class Blake2s224
        extends BCMessageDigest
        implements Cloneable
    {
        public Blake2s224()
        {
            super(new Blake2sDigest(224));
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            Blake2s224 d = (Blake2s224)super.clone();
            d.digest = new Blake2sDigest((Blake2sDigest)digest);

            return d;
        }
    }

    static public class Blake2s160
        extends BCMessageDigest
        implements Cloneable
    {
        public Blake2s160()
        {
            super(new Blake2sDigest(160));
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            Blake2s160 d = (Blake2s160)super.clone();
            d.digest = new Blake2sDigest((Blake2sDigest)digest);

            return d;
        }
    }

    static public class Blake2s128
        extends BCMessageDigest
        implements Cloneable
    {
        public Blake2s128()
        {
            super(new Blake2sDigest(128));
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            Blake2s128 d = (Blake2s128)super.clone();
            d.digest = new Blake2sDigest((Blake2sDigest)digest);

            return d;
        }
    }

    public static class Mappings
        extends DigestAlgorithmProvider
    {
        private static final String PREFIX = Blake2s.class.getName();

        public Mappings()
        {
        }

        public void configure(ConfigurableProvider provider)
        {
            provider.addAlgorithm("MessageDigest.BLAKE2S-256", PREFIX + "$Blake2s256");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + MiscObjectIdentifiers.id_blake2s256, "BLAKE2S-256");

            provider.addAlgorithm("MessageDigest.BLAKE2S-224", PREFIX + "$Blake2s224");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + MiscObjectIdentifiers.id_blake2s224, "BLAKE2S-224");

            provider.addAlgorithm("MessageDigest.BLAKE2S-160", PREFIX + "$Blake2s160");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + MiscObjectIdentifiers.id_blake2s160, "BLAKE2S-160");

            provider.addAlgorithm("MessageDigest.BLAKE2S-128", PREFIX + "$Blake2s128");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + MiscObjectIdentifiers.id_blake2s128, "BLAKE2S-128");
        }
    }
}