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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.

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package org.bouncycastle.pqc.crypto.xmss;

import org.bouncycastle.pqc.crypto.xmss.XMSSUtil;

/**
 * OTS hash address.
 *
 */
public 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();
		XMSSUtil.intToBytesBigEndianOffset(byteRepresentation, otsAddress, 16);
		XMSSUtil.intToBytesBigEndianOffset(byteRepresentation, chainAddress, 20);
		XMSSUtil.intToBytesBigEndianOffset(byteRepresentation, hashAddress, 24);
		return byteRepresentation;
	}

	protected int getOTSAddress() {
		return otsAddress;
	}
	
	protected int getChainAddress() {
		return chainAddress;
	}
	
	protected int getHashAddress() {
		return hashAddress;
	}
}