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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.pqc.crypto.xmss;

import org.bouncycastle.util.Pack;

/**
 * Hash tree address.
 */
final class HashTreeAddress
    extends XMSSAddress
{

    private static final int TYPE = 0x02;
    private static final int PADDING = 0x00;

    private final int padding;
    private final int treeHeight;
    private final int treeIndex;

    private HashTreeAddress(Builder builder)
    {
        super(builder);
        padding = PADDING;
        treeHeight = builder.treeHeight;
        treeIndex = builder.treeIndex;
    }

    protected static class Builder
        extends XMSSAddress.Builder
    {

        /* optional */
        private int treeHeight = 0;
        private int treeIndex = 0;

        protected Builder()
        {
            super(TYPE);
        }

        protected Builder withTreeHeight(int val)
        {
            treeHeight = val;
            return this;
        }

        protected Builder withTreeIndex(int val)
        {
            treeIndex = val;
            return this;
        }

        @Override
        protected XMSSAddress build()
        {
            return new HashTreeAddress(this);
        }

        @Override
        protected Builder getThis()
        {
            return this;
        }
    }

    @Override
    protected byte[] toByteArray()
    {
        byte[] byteRepresentation = super.toByteArray();
        Pack.intToBigEndian(padding, byteRepresentation,16);
        Pack.intToBigEndian(treeHeight, byteRepresentation, 20);
        Pack.intToBigEndian(treeIndex, byteRepresentation, 24);
        return byteRepresentation;
    }

    protected int getPadding()
    {
        return padding;
    }

    protected int getTreeHeight()
    {
        return treeHeight;
    }

    protected int getTreeIndex()
    {
        return treeIndex;
    }
}