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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 1.4.
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package org.bouncycastle.pqc.jcajce.provider.sphincs;

import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.SignatureException;
import java.security.spec.AlgorithmParameterSpec;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA3Digest;
import org.bouncycastle.crypto.digests.SHA512Digest;
import org.bouncycastle.crypto.digests.SHA512tDigest;
import org.bouncycastle.pqc.crypto.sphincs.SPHINCS256Signer;

public class SignatureSpi
    extends java.security.SignatureSpi
{
    private final ASN1ObjectIdentifier treeDigest;
    private Digest digest;
    private SPHINCS256Signer signer;
    private SecureRandom random;

    protected SignatureSpi(Digest digest, ASN1ObjectIdentifier treeDigest, SPHINCS256Signer signer)
    {
        this.digest = digest;
        this.treeDigest = treeDigest;
        this.signer = signer;
    }

    protected void engineInitVerify(PublicKey publicKey)
        throws InvalidKeyException
    {
        if (publicKey instanceof BCSphincs256PublicKey)
        {
            BCSphincs256PublicKey key = (BCSphincs256PublicKey)publicKey;
            if (!treeDigest.equals(key.getTreeDigest()))
            {
                throw new InvalidKeyException("SPHINCS-256 signature for tree digest: " + key.getTreeDigest());
            }
            CipherParameters param = key.getKeyParams();

            digest.reset();
            signer.init(false, param);
        }
        else
        {
            throw new InvalidKeyException("unknown public key passed to SPHINCS-256");
        }
    }

    protected void engineInitSign(PrivateKey privateKey, SecureRandom random)
        throws InvalidKeyException
    {
        this.random = random;
        engineInitSign(privateKey);
    }

    protected void engineInitSign(PrivateKey privateKey)
        throws InvalidKeyException
    {
        if (privateKey instanceof BCSphincs256PrivateKey)
        {
            BCSphincs256PrivateKey key = (BCSphincs256PrivateKey)privateKey;
            if (!treeDigest.equals(key.getTreeDigest()))
            {
                throw new InvalidKeyException("SPHINCS-256 signature for tree digest: " + key.getTreeDigest());
            }

            CipherParameters param = key.getKeyParams();

            // random not required for SPHINCS.
//            if (random != null)
//            {
//                param = new ParametersWithRandom(param, random);
//            }

            digest.reset();
            signer.init(true, param);
        }
        else
        {
            throw new InvalidKeyException("unknown private key passed to SPHINCS-256");
        }
    }

    protected void engineUpdate(byte b)
        throws SignatureException
    {
        digest.update(b);
    }

    protected void engineUpdate(byte[] b, int off, int len)
        throws SignatureException
    {
        digest.update(b, off, len);
    }

    protected byte[] engineSign()
        throws SignatureException
    {
        byte[] hash = new byte[digest.getDigestSize()];
        digest.doFinal(hash, 0);
        try
        {
            byte[] sig = signer.generateSignature(hash);

            return sig;
        }
        catch (Exception e)
        {
            throw new SignatureException(e.toString());
        }
    }

    protected boolean engineVerify(byte[] sigBytes)
        throws SignatureException
    {
        byte[] hash = new byte[digest.getDigestSize()];
        digest.doFinal(hash, 0);

        return signer.verifySignature(hash, sigBytes);
    }

    protected void engineSetParameter(AlgorithmParameterSpec params)
    {
        // TODO
        throw new UnsupportedOperationException("engineSetParameter unsupported");
    }

    /**
     * @deprecated replaced with #engineSetParameter(java.security.spec.AlgorithmParameterSpec)
     */
    protected void engineSetParameter(String param, Object value)
    {
        throw new UnsupportedOperationException("engineSetParameter unsupported");
    }

    /**
     * @deprecated
     */
    protected Object engineGetParameter(String param)
    {
        throw new UnsupportedOperationException("engineSetParameter unsupported");
    }

    static public class withSha512
        extends SignatureSpi
    {
        public withSha512()
        {
            super(new SHA512Digest(), NISTObjectIdentifiers.id_sha512_256, new SPHINCS256Signer(new SHA512tDigest(256), new SHA512Digest()));
        }
    }

    static public class withSha3_512
        extends SignatureSpi
    {
        public withSha3_512()
        {
            super(new SHA3Digest(512), NISTObjectIdentifiers.id_sha3_256, new SPHINCS256Signer(new SHA3Digest(256), new SHA3Digest(512)));
        }
    }
}