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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.pqc.jcajce.provider.xmss;

import java.security.InvalidAlgorithmParameterException;
import java.security.KeyPair;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;

import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.nist.NISTObjectIdentifiers;
import org.spongycastle.crypto.AsymmetricCipherKeyPair;
import org.spongycastle.crypto.digests.SHA256Digest;
import org.spongycastle.crypto.digests.SHA512Digest;
import org.spongycastle.crypto.digests.SHAKEDigest;
import org.spongycastle.pqc.crypto.xmss.XMSSKeyGenerationParameters;
import org.spongycastle.pqc.crypto.xmss.XMSSKeyPairGenerator;
import org.spongycastle.pqc.crypto.xmss.XMSSParameters;
import org.spongycastle.pqc.crypto.xmss.XMSSPrivateKeyParameters;
import org.spongycastle.pqc.crypto.xmss.XMSSPublicKeyParameters;
import org.spongycastle.pqc.jcajce.spec.XMSSParameterSpec;

public class XMSSKeyPairGeneratorSpi
    extends java.security.KeyPairGenerator
{
    private XMSSKeyGenerationParameters param;
    private ASN1ObjectIdentifier treeDigest;
    private XMSSKeyPairGenerator engine = new XMSSKeyPairGenerator();

    private SecureRandom random = new SecureRandom();
    private boolean initialised = false;

    public XMSSKeyPairGeneratorSpi()
    {
        super("XMSS");
    }

    public void initialize(
        int strength,
        SecureRandom random)
    {
        throw new IllegalArgumentException("use AlgorithmParameterSpec");
    }

    public void initialize(
        AlgorithmParameterSpec params,
        SecureRandom random)
        throws InvalidAlgorithmParameterException
    {
        if (!(params instanceof XMSSParameterSpec))
        {
            throw new InvalidAlgorithmParameterException("parameter object not a XMSSParameterSpec");
        }

        XMSSParameterSpec xmssParams = (XMSSParameterSpec)params;

        if (xmssParams.getTreeDigest().equals(XMSSParameterSpec.SHA256))
        {
            treeDigest = NISTObjectIdentifiers.id_sha256;
            param = new XMSSKeyGenerationParameters(new XMSSParameters(xmssParams.getHeight(), new SHA256Digest()), random);
        }
        else if (xmssParams.getTreeDigest().equals(XMSSParameterSpec.SHA512))
        {
            treeDigest = NISTObjectIdentifiers.id_sha512;
            param = new XMSSKeyGenerationParameters(new XMSSParameters(xmssParams.getHeight(), new SHA512Digest()), random);
        }
        else if (xmssParams.getTreeDigest().equals(XMSSParameterSpec.SHAKE128))
        {
            treeDigest = NISTObjectIdentifiers.id_shake128;
            param = new XMSSKeyGenerationParameters(new XMSSParameters(xmssParams.getHeight(), new SHAKEDigest(128)), random);
        }
        else if (xmssParams.getTreeDigest().equals(XMSSParameterSpec.SHAKE256))
        {
            treeDigest = NISTObjectIdentifiers.id_shake256;
            param = new XMSSKeyGenerationParameters(new XMSSParameters(xmssParams.getHeight(), new SHAKEDigest(256)), random);
        }

        engine.init(param);
        initialised = true;
    }

    public KeyPair generateKeyPair()
    {
        if (!initialised)
        {
            param = new XMSSKeyGenerationParameters(new XMSSParameters(10, new SHA512Digest()), random);

            engine.init(param);
            initialised = true;
        }

        AsymmetricCipherKeyPair pair = engine.generateKeyPair();
        XMSSPublicKeyParameters pub = (XMSSPublicKeyParameters)pair.getPublic();
        XMSSPrivateKeyParameters priv = (XMSSPrivateKeyParameters)pair.getPrivate();

        return new KeyPair(new BCXMSSPublicKey(treeDigest, pub), new BCXMSSPrivateKey(treeDigest, priv));
    }
}