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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.X25519PrivateKeyParameters;
import org.bouncycastle.pqc.crypto.mlkem.MLKEMParameters;
import org.bouncycastle.pqc.crypto.mlkem.MLKEMPrivateKeyParameters;
import org.bouncycastle.util.Arrays;

public class XWingPrivateKeyParameters
    extends XWingKeyParameters
{
    private final MLKEMPrivateKeyParameters kybPriv;
    private final X25519PrivateKeyParameters xdhPriv;

    XWingPrivateKeyParameters(AsymmetricKeyParameter kybPriv, AsymmetricKeyParameter xdhPriv)
    {
        super(true);

        this.kybPriv = (MLKEMPrivateKeyParameters)kybPriv;
        this.xdhPriv = (X25519PrivateKeyParameters)xdhPriv;
    }

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

        this.kybPriv = new MLKEMPrivateKeyParameters(MLKEMParameters.ml_kem_768, Arrays.copyOfRange(encoding, 0, encoding.length - X25519PrivateKeyParameters.KEY_SIZE));
        this.xdhPriv = new X25519PrivateKeyParameters(encoding, encoding.length - X25519PrivateKeyParameters.KEY_SIZE);
    }

    MLKEMPrivateKeyParameters getKyberPrivateKey()
    {
        return kybPriv;
    }

    X25519PrivateKeyParameters getXDHPrivateKey()
    {
        return xdhPriv;
    }

    public byte[] getEncoded()
    {
        return Arrays.concatenate(kybPriv.getEncoded(), xdhPriv.getEncoded());
    }
}