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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;

/**
 * OTS hash address.
 */
final class OTSHashAddress
    extends XMSSAddress
{

    private static final int TYPE = 0x00;

    private final int otsAddress;
    private final int chainAddress;
    private final int hashAddress;

    private OTSHashAddress(Builder builder)
    {
        super(builder);
        otsAddress = builder.otsAddress;
        chainAddress = builder.chainAddress;
        hashAddress = builder.hashAddress;
    }

    protected static class Builder
        extends XMSSAddress.Builder
    {

        /* optional */
        private int otsAddress = 0;
        private int chainAddress = 0;
        private int hashAddress = 0;

        protected Builder()
        {
            super(TYPE);
        }

        protected Builder withOTSAddress(int val)
        {
            otsAddress = val;
            return this;
        }

        protected Builder withChainAddress(int val)
        {
            chainAddress = val;
            return this;
        }

        protected Builder withHashAddress(int val)
        {
            hashAddress = val;
            return this;
        }

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

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

    @Override
    protected byte[] toByteArray()
    {
        byte[] byteRepresentation = super.toByteArray();
        Pack.intToBigEndian(otsAddress, byteRepresentation,16);
        Pack.intToBigEndian(chainAddress, byteRepresentation, 20);
        Pack.intToBigEndian(hashAddress, byteRepresentation, 24);
        return byteRepresentation;
    }

    protected int getOTSAddress()
    {
        return otsAddress;
    }

    protected int getChainAddress()
    {
        return chainAddress;
    }

    protected int getHashAddress()
    {
        return hashAddress;
    }
}