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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 with debug enabled.
package org.bouncycastle.pqc.crypto.xmss;
import java.util.ArrayList;
import java.util.List;
/**
* Reduced XMSS Signature.
*/
public class XMSSReducedSignature
implements XMSSStoreableObjectInterface
{
private final XMSSParameters params;
private final WOTSPlusSignature wotsPlusSignature;
private final List authPath;
protected XMSSReducedSignature(Builder builder)
{
super();
params = builder.params;
if (params == null)
{
throw new NullPointerException("params == null");
}
int n = params.getDigestSize();
int len = params.getWOTSPlus().getParams().getLen();
int height = params.getHeight();
byte[] reducedSignature = builder.reducedSignature;
if (reducedSignature != null)
{
/* import */
int signatureSize = len * n;
int authPathSize = height * n;
int totalSize = signatureSize + authPathSize;
if (reducedSignature.length != totalSize)
{
throw new IllegalArgumentException("signature has wrong size");
}
int position = 0;
byte[][] wotsPlusSignature = new byte[len][];
for (int i = 0; i < wotsPlusSignature.length; i++)
{
wotsPlusSignature[i] = XMSSUtil.extractBytesAtOffset(reducedSignature, position, n);
position += n;
}
this.wotsPlusSignature = new WOTSPlusSignature(params.getWOTSPlus().getParams(), wotsPlusSignature);
List nodeList = new ArrayList();
for (int i = 0; i < height; i++)
{
nodeList.add(new XMSSNode(i, XMSSUtil.extractBytesAtOffset(reducedSignature, position, n)));
position += n;
}
authPath = nodeList;
}
else
{
/* set */
WOTSPlusSignature tmpSignature = builder.wotsPlusSignature;
if (tmpSignature != null)
{
wotsPlusSignature = tmpSignature;
}
else
{
wotsPlusSignature = new WOTSPlusSignature(params.getWOTSPlus().getParams(), new byte[len][n]);
}
List tmpAuthPath = builder.authPath;
if (tmpAuthPath != null)
{
if (tmpAuthPath.size() != height)
{
throw new IllegalArgumentException("size of authPath needs to be equal to height of tree");
}
authPath = tmpAuthPath;
}
else
{
authPath = new ArrayList();
}
}
}
public static class Builder
{
/* mandatory */
private final XMSSParameters params;
/* optional */
private WOTSPlusSignature wotsPlusSignature = null;
private List authPath = null;
private byte[] reducedSignature = null;
public Builder(XMSSParameters params)
{
super();
this.params = params;
}
public Builder withWOTSPlusSignature(WOTSPlusSignature val)
{
wotsPlusSignature = val;
return this;
}
public Builder withAuthPath(List val)
{
authPath = val;
return this;
}
public Builder withReducedSignature(byte[] val)
{
reducedSignature = XMSSUtil.cloneArray(val);
return this;
}
public XMSSReducedSignature build()
{
return new XMSSReducedSignature(this);
}
}
public byte[] toByteArray()
{
/* signature || authentication path */
int n = params.getDigestSize();
int signatureSize = params.getWOTSPlus().getParams().getLen() * n;
int authPathSize = params.getHeight() * n;
int totalSize = signatureSize + authPathSize;
byte[] out = new byte[totalSize];
int position = 0;
/* copy signature */
byte[][] signature = this.wotsPlusSignature.toByteArray();
for (int i = 0; i < signature.length; i++)
{
XMSSUtil.copyBytesAtOffset(out, signature[i], position);
position += n;
}
/* copy authentication path */
for (int i = 0; i < authPath.size(); i++)
{
byte[] value = authPath.get(i).getValue();
XMSSUtil.copyBytesAtOffset(out, value, position);
position += n;
}
return out;
}
public XMSSParameters getParams()
{
return params;
}
public WOTSPlusSignature getWOTSPlusSignature()
{
return wotsPlusSignature;
}
public List getAuthPath()
{
return authPath;
}
}
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