package org.bouncycastle.pqc.crypto.xmss;
import java.security.SecureRandom;
import org.bouncycastle.crypto.Digest;
/**
* XMSS^MT Parameters.
*
*/
public final class XMSSMTParameters {
private final XMSSOid oid;
private final XMSS xmss;
private final int height;
private final int layers;
/**
* XMSSMT constructor...
*
* @param height
* Height of tree.
* @param layers
* Amount of layers.
* @param digest
* Digest to use.
* @param prng
* Secure random to use.
*/
public XMSSMTParameters(int height, int layers, Digest digest, SecureRandom prng) {
super();
this.height = height;
this.layers = layers;
this.xmss = new XMSS(new XMSSParameters(xmssTreeHeight(height, layers), digest, prng));
oid = DefaultXMSSMTOid.lookup(getDigest().getAlgorithmName(), getDigestSize(), getWinternitzParameter(),
getLen(), getHeight(), layers);
/*
* if (oid == null) { throw new InvalidParameterException(); }
*/
}
private static int xmssTreeHeight(int height, int layers) throws IllegalArgumentException {
if (height < 2) {
throw new IllegalArgumentException("totalHeight must be > 1");
}
if (height % layers != 0) {
throw new IllegalArgumentException("layers must divide totalHeight without remainder");
}
if (height / layers == 1) {
throw new IllegalArgumentException("height / layers must be greater than 1");
}
return height / layers;
}
/**
* Getter height.
*
* @return XMSSMT height.
*/
public int getHeight() {
return height;
}
/**
* Getter layers.
*
* @return XMSSMT layers.
*/
public int getLayers() {
return layers;
}
protected XMSS getXMSS() {
return xmss;
}
protected WOTSPlus getWOTSPlus() {
return xmss.getWOTSPlus();
}
protected Digest getDigest() {
return xmss.getParams().getDigest();
}
/**
* Getter digest size.
*
* @return Digest size.
*/
public int getDigestSize() {
return xmss.getParams().getDigestSize();
}
/**
* Getter Winternitz parameter.
*
* @return Winternitz parameter.
*/
public int getWinternitzParameter() {
return xmss.getParams().getWinternitzParameter();
}
protected int getLen() {
return xmss.getWOTSPlus().getParams().getLen();
}
}