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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 1.4. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.crypto.tls.test;

import java.security.SecureRandom;

import junit.framework.TestCase;

import org.bouncycastle.crypto.tls.DTLSClientProtocol;
import org.bouncycastle.crypto.tls.DTLSServerProtocol;
import org.bouncycastle.crypto.tls.DTLSTransport;
import org.bouncycastle.crypto.tls.DatagramTransport;
import org.bouncycastle.util.Arrays;

public class DTLSProtocolTest
    extends TestCase
{
    public void testClientServer()
        throws Exception
    {
        SecureRandom secureRandom = new SecureRandom();

        DTLSClientProtocol clientProtocol = new DTLSClientProtocol(secureRandom);
        DTLSServerProtocol serverProtocol = new DTLSServerProtocol(secureRandom);

        MockDatagramAssociation network = new MockDatagramAssociation(1500);

        ServerThread serverThread = new ServerThread(serverProtocol, network.getServer());
        serverThread.start();

        DatagramTransport clientTransport = network.getClient();

        clientTransport = new UnreliableDatagramTransport(clientTransport, secureRandom, 0, 0);

        clientTransport = new LoggingDatagramTransport(clientTransport, System.out);

        MockDTLSClient client = new MockDTLSClient(null);

        DTLSTransport dtlsClient = clientProtocol.connect(client, clientTransport);

        for (int i = 1; i <= 10; ++i)
        {
            byte[] data = new byte[i];
            Arrays.fill(data, (byte)i);
            dtlsClient.send(data, 0, data.length);
        }

        byte[] buf = new byte[dtlsClient.getReceiveLimit()];
        while (dtlsClient.receive(buf, 0, buf.length, 100) >= 0)
        {
        }

        dtlsClient.close();

        serverThread.shutdown();
    }

    static class ServerThread
        extends Thread
    {
        private final DTLSServerProtocol serverProtocol;
        private final DatagramTransport serverTransport;
        private volatile boolean isShutdown = false;

        ServerThread(DTLSServerProtocol serverProtocol, DatagramTransport serverTransport)
        {
            this.serverProtocol = serverProtocol;
            this.serverTransport = serverTransport;
        }

        public void run()
        {
            try
            {
                MockDTLSServer server = new MockDTLSServer();
                DTLSTransport dtlsServer = serverProtocol.accept(server, serverTransport);
                byte[] buf = new byte[dtlsServer.getReceiveLimit()];
                while (!isShutdown)
                {
                    int length = dtlsServer.receive(buf, 0, buf.length, 1000);
                    if (length >= 0)
                    {
                        dtlsServer.send(buf, 0, length);
                    }
                }
                dtlsServer.close();
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }

        void shutdown()
            throws InterruptedException
        {
            if (!isShutdown)
            {
                isShutdown = true;
                this.join();
            }
        }
    }
}