bcprov/src/main/java/org/bouncycastle/pqc/crypto/test/XMSSMTSignatureTest.java

package org.bouncycastle.pqc.crypto.test;

import java.text.ParseException;

import junit.framework.TestCase;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.pqc.crypto.xmss.NullPRNG;
import org.bouncycastle.pqc.crypto.xmss.XMSSMT;
import org.bouncycastle.pqc.crypto.xmss.XMSSMTParameters;
import org.bouncycastle.pqc.crypto.xmss.XMSSMTSignature;
import org.bouncycastle.pqc.crypto.xmss.XMSSUtil;

/**
 * Test cases for XMSS^MT signature class.
 */
public class XMSSMTSignatureTest extends TestCase {

	public void testSignatureParsingSHA256() {
		int totalHeight = 6;
		int layers = 3;
		byte[] message = new byte[1024];
		XMSSMTParameters params = new XMSSMTParameters(totalHeight, layers, new SHA256Digest(), new NullPRNG());
		XMSSMT xmssMT = new XMSSMT(params);
		xmssMT.generateKeys();
		byte[] signature1 = xmssMT.sign(message);
		XMSSMTSignature mtSignature = null;
		try {
			mtSignature = new XMSSMTSignature.Builder(params).withSignature(signature1).build();
			byte[] signature2 = mtSignature.toByteArray();
			assertTrue(XMSSUtil.compareByteArray(signature1, signature2));
		} catch (ParseException e) {
			e.printStackTrace();
			fail();
		}
	}

	public void testConstructor() {
		XMSSMTParameters params = new XMSSMTParameters(20, 10, new SHA256Digest(), new NullPRNG());
		XMSSMTSignature sig = null;
		try {
			sig = new XMSSMTSignature.Builder(params).build();
		} catch (ParseException ex) {
			ex.printStackTrace();
		}
		byte[] sigByte = sig.toByteArray();
		/* check everything is 0 */
		for (int i = 0; i < sigByte.length; i++) {
			assertEquals(0x00, sigByte[i]);
		}
	}
}