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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 1.8 and up.

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package org.bouncycastle.pqc.jcajce.spec;

import java.security.spec.AlgorithmParameterSpec;

public class XMSSParameterSpec
    implements AlgorithmParameterSpec
{
    /**
     * Use SHA-256 for the tree generation function.
     */
    public static final String SHA256 = "SHA256";

    /**
     * Use SHA512 for the tree generation function.
     */
    public static final String SHA512 = "SHA512";

    /**
     * Use SHAKE128 for the tree generation function.
     */
    public static final String SHAKE128 = "SHAKE128";

    /**
     * Use SHAKE256 for the tree generation function.
     */
    public static final String SHAKE256 = "SHAKE256";

    /**
     * Standard XMSS parameters
     */
    public static final XMSSParameterSpec SHA2_10_256 = new XMSSParameterSpec(10, SHA256);
    public static final XMSSParameterSpec SHA2_16_256 = new XMSSParameterSpec(16, SHA256);
    public static final XMSSParameterSpec SHA2_20_256 = new XMSSParameterSpec(20, SHA256);
    public static final XMSSParameterSpec SHAKE_10_256 = new XMSSParameterSpec(10, SHAKE128);
    public static final XMSSParameterSpec SHAKE_16_256 = new XMSSParameterSpec(16, SHAKE128);
    public static final XMSSParameterSpec SHAKE_20_256 = new XMSSParameterSpec(20, SHAKE128);

    public static final XMSSParameterSpec SHA2_10_512 = new XMSSParameterSpec(10, SHA512);
    public static final XMSSParameterSpec SHA2_16_512 = new XMSSParameterSpec(16, SHA512);
    public static final XMSSParameterSpec SHA2_20_512 = new XMSSParameterSpec(20, SHA512);
    public static final XMSSParameterSpec SHAKE_10_512 = new XMSSParameterSpec(10, SHAKE256);
    public static final XMSSParameterSpec SHAKE_16_512 = new XMSSParameterSpec(16, SHAKE256);
    public static final XMSSParameterSpec SHAKE_20_512 = new XMSSParameterSpec(20, SHAKE256);

    private final int height;
    private final String treeDigest;

    public XMSSParameterSpec(int height, String treeDigest)
    {
        this.height = height;
        this.treeDigest = treeDigest;
    }

    public String getTreeDigest()
    {
        return treeDigest;
    }

    public int getHeight()
    {
        return height;
    }
}