import net.moznion.wireguard.keytool.InvalidPrivateKeyException;
import net.moznion.wireguard.keytool.WireGuardKey;

class App {
    public static void doSomething() throws InvalidPrivateKeyException {
        final WireGuardKey generatedKey = WireGuardKey.generate();
        System.out.println(generatedKey.getBase64PrivateKey()); // => output: base64 encoded private key
        System.out.println(generatedKey.getBase64PublicKey()); // => output: base64 encoded public key
    }
}