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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.7.

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package org.spongycastle.jcajce.provider.digest;

import org.spongycastle.asn1.nist.NISTObjectIdentifiers;
import org.spongycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.spongycastle.crypto.CipherKeyGenerator;
import org.spongycastle.crypto.digests.SHA512Digest;
import org.spongycastle.crypto.macs.HMac;
import org.spongycastle.jcajce.provider.config.ConfigurableProvider;
import org.spongycastle.jcajce.provider.symmetric.util.BaseKeyGenerator;
import org.spongycastle.jce.provider.JCEMac;

public class SHA512
{
    static public class Digest
        extends BCMessageDigest
        implements Cloneable
    {
        public Digest()
        {
            super(new SHA512Digest());
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            Digest d = (Digest)super.clone();
            d.digest = new SHA512Digest((SHA512Digest)digest);

            return d;
        }
    }

    public static class HashMac
        extends JCEMac
    {
        public HashMac()
        {
            super(new HMac(new SHA512Digest()));
        }
    }

    /**
     * HMACSHA512
     */
    public static class KeyGenerator
        extends BaseKeyGenerator
    {
        public KeyGenerator()
        {
            super("HMACSHA512", 512, new CipherKeyGenerator());
        }
    }

    public static class Mappings
        extends DigestAlgorithmProvider
    {
        private static final String PREFIX = SHA512.class.getName();

        public Mappings()
        {
        }

        public void configure(ConfigurableProvider provider)
        {
            provider.addAlgorithm("MessageDigest.SHA-512", PREFIX + "$Digest");
            provider.addAlgorithm("Alg.Alias.MessageDigest.SHA512", "SHA-512");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + NISTObjectIdentifiers.id_sha512, "SHA-512");

            addHMACAlgorithm(provider, "SHA512", PREFIX + "$HashMac",  PREFIX + "$KeyGenerator");
            addHMACAlias(provider, "SHA512", PKCSObjectIdentifiers.id_hmacWithSHA512);
        }
    }

}