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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 and up.
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package org.bouncycastle.jcajce.provider.digest;

import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.crypto.CipherKeyGenerator;
import org.bouncycastle.crypto.digests.SHA512Digest;
import org.bouncycastle.crypto.digests.SHA512tDigest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.macs.OldHMac;
import org.bouncycastle.jcajce.provider.config.ConfigurableProvider;
import org.bouncycastle.jcajce.provider.symmetric.util.BaseKeyGenerator;
import org.bouncycastle.jcajce.provider.symmetric.util.BaseMac;

public class SHA512
{
    private 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;
        }
    }

    static public class DigestT
        extends BCMessageDigest
        implements Cloneable
    {
        public DigestT(int bitLength)
        {
            super(new SHA512tDigest(bitLength));
        }

        public Object clone()
            throws CloneNotSupportedException
        {
            DigestT d = (DigestT)super.clone();
            d.digest = new SHA512tDigest((SHA512tDigest)digest);

            return d;
        }
    }

    static public class DigestT224
        extends DigestT
    {
        public DigestT224()
        {
            super(224);
        }
    }

    static public class DigestT256
        extends DigestT
    {
        public DigestT256()
        {
            super(256);
        }
    }

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

    public static class HashMacT224
        extends BaseMac
    {
        public HashMacT224()
        {
            super(new HMac(new SHA512tDigest(224)));
        }
    }

    public static class HashMacT256
        extends BaseMac
    {
        public HashMacT256()
        {
            super(new HMac(new SHA512tDigest(256)));
        }
    }

    /**
     * SHA-512 HMac
     */
    public static class OldSHA512
        extends BaseMac
    {
        public OldSHA512()
        {
            super(new OldHMac(new SHA512Digest()));
        }
    }

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

    public static class KeyGeneratorT224
        extends BaseKeyGenerator
    {
        public KeyGeneratorT224()
        {
            super("HMACSHA512/224", 224, new CipherKeyGenerator());
        }
    }

    public static class KeyGeneratorT256
        extends BaseKeyGenerator
    {
        public KeyGeneratorT256()
        {
            super("HMACSHA512/256", 256, 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");

            provider.addAlgorithm("MessageDigest.SHA-512/224", PREFIX + "$DigestT224");
            provider.addAlgorithm("Alg.Alias.MessageDigest.SHA512/224", "SHA-512/224");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + NISTObjectIdentifiers.id_sha512_224, "SHA-512/224");

            provider.addAlgorithm("MessageDigest.SHA-512/256", PREFIX + "$DigestT256");
            provider.addAlgorithm("Alg.Alias.MessageDigest.SHA512256", "SHA-512/256");
            provider.addAlgorithm("Alg.Alias.MessageDigest." + NISTObjectIdentifiers.id_sha512_256, "SHA-512/256");

            provider.addAlgorithm("Mac.OLDHMACSHA512", PREFIX + "$OldSHA512");

            provider.addAlgorithm("Mac.PBEWITHHMACSHA512", PREFIX + "$HashMac");

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

            addHMACAlgorithm(provider, "SHA512/224", PREFIX + "$HashMacT224",  PREFIX + "$KeyGeneratorT224");
            addHMACAlgorithm(provider, "SHA512/256", PREFIX + "$HashMacT256",  PREFIX + "$KeyGeneratorT256");
        }
    }

}