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The Long Term Stable (LTS) Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains the JCA/JCE provider and low-level API for the BC LTS version 2.73.6 for Java 8 and later.

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package org.bouncycastle.pqc.crypto.lms;

import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator;
import org.bouncycastle.crypto.KeyGenerationParameters;

public class HSSKeyPairGenerator
    implements AsymmetricCipherKeyPairGenerator
{
    HSSKeyGenerationParameters param;

    public void init(KeyGenerationParameters param)
    {
        this.param = (HSSKeyGenerationParameters)param;
    }

    public AsymmetricCipherKeyPair generateKeyPair()
    {
        HSSPrivateKeyParameters privKey = HSS.generateHSSKeyPair(param);

        return new AsymmetricCipherKeyPair(privKey.getPublicKey(), privKey);
    }
}