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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. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.pqc.crypto.xmss;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * WOTS+ OID class.
 * 
 */
public final class WOTSPlusOid implements XMSSOid {

	/**
	 * XMSS OID lookup table.
	 */
	private static final Map oidLookupTable;

	static {
		Map map = new HashMap();
		map.put(createKey("SHA-256", 32, 16, 67), new WOTSPlusOid(0x01000001, "WOTSP_SHA2-256_W16"));
		map.put(createKey("SHA-512", 64, 16, 131), new WOTSPlusOid(0x02000002, "WOTSP_SHA2-512_W16"));
		map.put(createKey("SHAKE128", 32, 16, 67), new WOTSPlusOid(0x03000003, "WOTSP_SHAKE128_W16"));
		map.put(createKey("SHAKE256", 64, 16, 131), new WOTSPlusOid(0x04000004, "WOTSP_SHAKE256_W16"));
		oidLookupTable = Collections.unmodifiableMap(map);
	}

	/**
	 * OID.
	 */
	private final int oid;
	/**
	 * String representation of OID.
	 */
	private final String stringRepresentation;

	/**
	 * Constructor...
	 *
	 * @param oid
	 *            OID.
	 * @param stringRepresentation
	 *            String representation of OID.
	 */
	private WOTSPlusOid(int oid, String stringRepresentation) {
		super();
		this.oid = oid;
		this.stringRepresentation = stringRepresentation;
	}

	/**
	 * Lookup OID.
	 *
	 * @param algorithmName
	 *            Algorithm name.
	 * @param winternitzParameter
	 *            Winternitz parameter.
	 * @return WOTS+ OID if parameters were found, null else.
	 */
	protected static WOTSPlusOid lookup(String algorithmName, int digestSize, int winternitzParameter, int len) {
		if (algorithmName == null) {
			throw new NullPointerException("algorithmName == null");
		}
		return oidLookupTable.get(createKey(algorithmName, digestSize, winternitzParameter, len));
	}

	/**
	 * Create a key based on parameters.
	 *
	 * @param algorithmName
	 *            Algorithm name.
	 * @param winternitzParameter
	 *            Winternitz Parameter.
	 * @return String representation of parameters for lookup table.
	 */
	private static String createKey(String algorithmName, int digestSize, int winternitzParameter, int len) {
		if (algorithmName == null) {
			throw new NullPointerException("algorithmName == null");
		}
		return algorithmName + "-" + digestSize + "-" + winternitzParameter + "-" + len;
	}

	/**
	 * Getter OID.
	 *
	 * @return OID.
	 */
	public int getOid() {
		return oid;
	}

	public String toString() {
		return stringRepresentation;
	}
}