import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.security.KeyStore;
import java.security.SecureRandom;

import javax.net.ssl.*;

public class Baseline {
    public static void main(String[] argv) throws Exception {
        // set up keystore
        String algorithm = KeyManagerFactory.getDefaultAlgorithm();
        KeyManagerFactory kmf = KeyManagerFactory.getInstance(algorithm);
        KeyStore ks = KeyStore.getInstance("JKS");
        InputStream ksIs = new FileInputStream("keystore.jks");
        ks.load(ksIs, "secret".toCharArray());
        kmf.init(ks, "secret".toCharArray());
        KeyManager[] km = kmf.getKeyManagers();

        // set up ssl context
        SSLContext context = SSLContext.getInstance("TLSv1.2");
        context.init(km, new TrustManager[0], new SecureRandom());

        // open socket
        SSLServerSocketFactory factory = context.getServerSocketFactory();
        SSLServerSocket ssocket = (SSLServerSocket) factory.createServerSocket(4444);
        ssocket.setEnabledProtocols(new String[] { "TLSv1.2" });
        ssocket.setNeedClientAuth(false);

        // accept and hello
        Socket socket = ssocket.accept();
        InputStream in = socket.getInputStream();
        OutputStream out = socket.getOutputStream();
        out.write("***hello***\n".getBytes());
        in.close();
        out.close();
    }
}