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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.7. Note: this package includes the IDEA and NTRU encryption algorithms.

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package org.bouncycastle.jcajce.provider.digest;

import org.bouncycastle.crypto.CipherKeyGenerator;
import org.bouncycastle.crypto.digests.SHA3Digest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.jcajce.provider.config.ConfigurableProvider;
import org.bouncycastle.jcajce.provider.symmetric.util.BaseKeyGenerator;
import org.bouncycastle.jce.provider.JCEMac;

public class SHA3
{
    static public class DigestSHA3
        extends BCMessageDigest
        implements Cloneable
    {
        public DigestSHA3(int size)
        {
            super(new SHA3Digest(size));
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            BCMessageDigest d = (BCMessageDigest)super.clone();
            d.digest = new SHA3Digest((SHA3Digest)digest);

            return d;
        }
    }
    
    static public class Digest224
        extends DigestSHA3
        {
            public Digest224()
            {
                super(224);
            }
        }

    static public class Digest256
    extends DigestSHA3
    {
        public Digest256()
        {
            super(256);
        }
    }
    
    static public class Digest384
    extends DigestSHA3
    {
        public Digest384()
        {
            super(384);
        }
    }
    
    static public class Digest512
    extends DigestSHA3
    {
        public Digest512()
        {
            super(512);
        }
    }
    
    /**
     * SHA3 HMac
     */
    public static class HashMac224
        extends JCEMac
    {
        public HashMac224()
        {
            super(new HMac(new SHA3Digest(224)));
        }
    }
    
    public static class HashMac256
        extends JCEMac
    {
        public HashMac256() {
            super(new HMac(new SHA3Digest(256)));
        }
    }
        
    public static class HashMac384
    extends JCEMac
    {
        public HashMac384() {
            super(new HMac(new SHA3Digest(384)));
        }
    }

    public static class HashMac512
        extends JCEMac
    {
        public HashMac512() {
            super(new HMac(new SHA3Digest(512)));
        }
    }

    public static class KeyGenerator224
        extends BaseKeyGenerator
    {
        public KeyGenerator224()
        {
            super("HMACSHA3-224", 224, new CipherKeyGenerator());
        }
    }

    public static class KeyGenerator256
        extends BaseKeyGenerator
    {
        public KeyGenerator256() {
            super("HMACSHA3-256", 256, new CipherKeyGenerator());
        }
    }

    public static class KeyGenerator384
        extends BaseKeyGenerator
    {
        public KeyGenerator384() {
            super("HMACSHA3-384", 384, new CipherKeyGenerator());
        }
    }
    
    public static class KeyGenerator512
        extends BaseKeyGenerator
    {
        public KeyGenerator512() {
            super("HMACSHA3-512", 512, new CipherKeyGenerator());
        }
    }
    
    public static class Mappings
        extends DigestAlgorithmProvider
    {
        private static final String PREFIX = SHA3.class.getName();

        public Mappings()
        {
        }

        public void configure(ConfigurableProvider provider)
        {
            provider.addAlgorithm("MessageDigest.SHA3-224", PREFIX + "$Digest224");
            provider.addAlgorithm("MessageDigest.SHA3-256", PREFIX + "$Digest256");
            provider.addAlgorithm("MessageDigest.SHA3-384", PREFIX + "$Digest384");
            provider.addAlgorithm("MessageDigest.SHA3-512", PREFIX + "$Digest512");
            // look for an object identifier (NIST???) for SHA3 family
            // provider.addAlgorithm("Alg.Alias.MessageDigest." + OIWObjectIdentifiers.idSHA3, "SHA3-224"); // *****

            addHMACAlgorithm(provider, "SHA3-224", PREFIX + "$HashMac224", PREFIX + "$KeyGenerator224");
            addHMACAlgorithm(provider, "SHA3-256", PREFIX + "$HashMac256", PREFIX + "$KeyGenerator256");
            addHMACAlgorithm(provider, "SHA3-384", PREFIX + "$HashMac384", PREFIX + "$KeyGenerator384");
            addHMACAlgorithm(provider, "SHA3-512", PREFIX + "$HashMac512", PREFIX + "$KeyGenerator512");
        }
    }
}