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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 to JDK 1.8 with debug enabled.

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package org.bouncycastle.pqc.crypto.xmss;

import java.io.Serializable;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

import org.bouncycastle.util.Integers;

public class BDSStateMap
    implements Serializable
{
    private final Map bdsState = new TreeMap();

    BDSStateMap()
    {

    }

    BDSStateMap(XMSSMTParameters params, long globalIndex, byte[] publicSeed, byte[] secretKeySeed)
    {
         for (long index = 0; index < globalIndex; index++)
         {
             updateState(params, index, publicSeed, secretKeySeed);
         }
    }

    BDSStateMap(BDSStateMap stateMap, XMSSMTParameters params, long globalIndex, byte[] publicSeed, byte[] secretKeySeed)
    {
        for (Iterator it = stateMap.bdsState.keySet().iterator(); it.hasNext();)
        {
            Integer key = (Integer)it.next();

            bdsState.put(key, stateMap.bdsState.get(key));
        }

        updateState(params, globalIndex, publicSeed, secretKeySeed);
    }

    private void updateState(XMSSMTParameters params, long globalIndex, byte[] publicSeed, byte[] secretKeySeed)
    {
        XMSSParameters xmssParams = params.getXMSSParameters();
        int xmssHeight = xmssParams.getHeight();

        //
        // set up state for next signature
        //
        long indexTree = XMSSUtil.getTreeIndex(globalIndex, xmssHeight);
        int indexLeaf = XMSSUtil.getLeafIndex(globalIndex, xmssHeight);

        OTSHashAddress otsHashAddress = (OTSHashAddress)new OTSHashAddress.Builder().withTreeAddress(indexTree)
            .withOTSAddress(indexLeaf).build();

        /* prepare authentication path for next leaf */
        if (indexLeaf < ((1 << xmssHeight) - 1))
        {
            if (this.get(0) == null || indexLeaf == 0)
            {
                this.put(0, new BDS(xmssParams, publicSeed, secretKeySeed, otsHashAddress));
            }

            this.update(0, publicSeed, secretKeySeed, otsHashAddress);
        }

        /* loop over remaining layers */
        for (int layer = 1; layer < params.getLayers(); layer++)
        {
                /* get root of layer - 1 */
            indexLeaf = XMSSUtil.getLeafIndex(indexTree, xmssHeight);
            indexTree = XMSSUtil.getTreeIndex(indexTree, xmssHeight);
                /* adjust addresses */
            otsHashAddress = (OTSHashAddress)new OTSHashAddress.Builder().withLayerAddress(layer)
                .withTreeAddress(indexTree).withOTSAddress(indexLeaf).build();

                /* prepare authentication path for next leaf */
            if (indexLeaf < ((1 << xmssHeight) - 1)
                && XMSSUtil.isNewAuthenticationPathNeeded(globalIndex, xmssHeight, layer))
            {
                if (this.get(layer) == null)
                {
                    this.put(layer, new BDS(params.getXMSSParameters(), publicSeed, secretKeySeed, otsHashAddress));
                }

                this.update(layer, publicSeed, secretKeySeed, otsHashAddress);
            }
        }
    }

    void setXMSS(XMSSParameters xmss)
    {
        for (Iterator it = bdsState.keySet().iterator(); it.hasNext();)
        {
            Integer key = (Integer)it.next();

            BDS bds = bdsState.get(key);
            bds.setXMSS(xmss);
            bds.validate();
        }
    }

    public boolean isEmpty()
    {
        return bdsState.isEmpty();
    }

    public BDS get(int index)
    {
        return bdsState.get(Integers.valueOf(index));
    }

    public BDS update(int index, byte[] publicSeed, byte[] secretKeySeed, OTSHashAddress otsHashAddress)
    {
        return bdsState.put(Integers.valueOf(index), bdsState.get(Integers.valueOf(index)).getNextState(publicSeed, secretKeySeed, otsHashAddress));
    }

    public void put(int index, BDS bds)
    {
        bdsState.put(Integers.valueOf(index), bds);
    }
}