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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.
package org.bouncycastle.pqc.crypto.xmss;
import java.security.SecureRandom;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.KeyGenerationParameters;
/**
* Key pair generator for XMSS keys.
*/
public final class XMSSKeyPairGenerator
{
private XMSSParameters params;
private SecureRandom prng;
/**
* Base constructor...
*/
public XMSSKeyPairGenerator()
{
}
public void init(
KeyGenerationParameters param)
{
XMSSKeyGenerationParameters parameters = (XMSSKeyGenerationParameters)param;
this.prng = parameters.getRandom();
this.params = parameters.getParameters();
}
/**
* Generate a new XMSS private key / public key pair.
*/
public AsymmetricCipherKeyPair generateKeyPair()
{
/* generate private key */
XMSSPrivateKeyParameters privateKey = generatePrivateKey(params, prng);
XMSSNode root = privateKey.getBDSState().getRoot();
privateKey = new XMSSPrivateKeyParameters.Builder(params)
.withSecretKeySeed(privateKey.getSecretKeySeed()).withSecretKeyPRF(privateKey.getSecretKeyPRF())
.withPublicSeed(privateKey.getPublicSeed()).withRoot(root.getValue())
.withBDSState(privateKey.getBDSState()).build();
XMSSPublicKeyParameters publicKey = new XMSSPublicKeyParameters.Builder(params).withRoot(root.getValue())
.withPublicSeed(privateKey.getPublicSeed()).build();
return new AsymmetricCipherKeyPair(publicKey, privateKey);
}
/**
* Generate an XMSS private key.
*
* @return XMSS private key.
*/
private XMSSPrivateKeyParameters generatePrivateKey(XMSSParameters params, SecureRandom prng)
{
int n = params.getTreeDigestSize();
byte[] secretKeySeed = new byte[n];
prng.nextBytes(secretKeySeed);
byte[] secretKeyPRF = new byte[n];
prng.nextBytes(secretKeyPRF);
byte[] publicSeed = new byte[n];
prng.nextBytes(publicSeed);
XMSSPrivateKeyParameters privateKey = new XMSSPrivateKeyParameters.Builder(params).withSecretKeySeed(secretKeySeed)
.withSecretKeyPRF(secretKeyPRF).withPublicSeed(publicSeed)
.withBDSState(new BDS(params, publicSeed, secretKeySeed, (OTSHashAddress)new OTSHashAddress.Builder().build())).build();
return privateKey;
}
}
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