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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.

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package org.bouncycastle.pqc.crypto.xwing;

import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.X25519PublicKeyParameters;
import org.bouncycastle.pqc.crypto.crystals.kyber.KyberParameters;
import org.bouncycastle.pqc.crypto.crystals.kyber.KyberPublicKeyParameters;
import org.bouncycastle.util.Arrays;

public class XWingPublicKeyParameters
    extends XWingKeyParameters
{
    private final KyberPublicKeyParameters kybPub;
    private final X25519PublicKeyParameters xdhPub;

    XWingPublicKeyParameters(AsymmetricKeyParameter kybPub, AsymmetricKeyParameter xdhPub)
    {
        super(false);

        this.kybPub = (KyberPublicKeyParameters)kybPub;
        this.xdhPub = (X25519PublicKeyParameters)xdhPub;
    }

    public XWingPublicKeyParameters(byte[] encoding)
    {
        super(false);

        this.kybPub = new KyberPublicKeyParameters(KyberParameters.kyber768, Arrays.copyOfRange(encoding, 0, encoding.length - X25519PublicKeyParameters.KEY_SIZE));
        this.xdhPub = new X25519PublicKeyParameters(encoding, encoding.length - X25519PublicKeyParameters.KEY_SIZE);
    }

    KyberPublicKeyParameters getKyberPublicKey()
    {
        return kybPub;
    }

    X25519PublicKeyParameters getXDHPublicKey()
    {
        return xdhPub;
    }

    public byte[] getEncoded()
    {
        return Arrays.concatenate(kybPub.getEncoded(), xdhPub.getEncoded());
    }
}