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http://stilius.net/java/java_ssl.php

 

http://www.java2s.com/Tutorial/Java/0490__Security/SSLServerSession.htm

 

http://www.koders.com/java/fid199C1E3C46D2644420D8B81790C79185FBAD8316.aspx

 

http://stackoverflow.com/questions/6559859/is-it-possible-to-change-plain-socket-to-sslsocket

 

JAVA + SSL Tutorial (server and client examples)

Certificate

First we need to make certificate, this is done by using keytool that is part of J2SE SDK (program will ask for certificate owner information and password, enter 123456 as password, or you can enter your password, but notice that you have to change it in other commands listen in this tutorial):

keytool -genkey -keystore mySrvKeystore -keyalg RSA

After this command you will have certificate file in working directory of issuing keytool command.

Server source code (EchoServer.java)

import javax.net.ssl.SSLServerSocket;
import javax.net.ssl.SSLServerSocketFactory;
import javax.net.ssl.SSLSocket;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

public
class EchoServer {
    public
            static
    void
            main(String[] arstring) {
        try {
            SSLServerSocketFactory sslserversocketfactory =
                    (SSLServerSocketFactory) SSLServerSocketFactory.getDefault();
            SSLServerSocket sslserversocket =
                    (SSLServerSocket) sslserversocketfactory.createServerSocket(9999);
            SSLSocket sslsocket = (SSLSocket) sslserversocket.accept();

            InputStream inputstream = sslsocket.getInputStream();
            InputStreamReader inputstreamreader = new InputStreamReader(inputstream);
            BufferedReader bufferedreader = new BufferedReader(inputstreamreader);

            String string = null;
            while ((string = bufferedreader.readLine()) != null) {
                System.out.println(string);
                System.out.flush();
            }
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
}
      

Compile it by using simple command:

javac EchoServer.java

Client source code (EchoClient.java)

import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import java.io.*;

public
class EchoClient {
    public
            static
    void
            main(String[] arstring) {
        try {
            SSLSocketFactory sslsocketfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
            SSLSocket sslsocket = (SSLSocket) sslsocketfactory.createSocket("localhost", 9999);

            InputStream inputstream = System.in;
            InputStreamReader inputstreamreader = new InputStreamReader(inputstream);
            BufferedReader bufferedreader = new BufferedReader(inputstreamreader);

            OutputStream outputstream = sslsocket.getOutputStream();
            OutputStreamWriter outputstreamwriter = new OutputStreamWriter(outputstream);
            BufferedWriter bufferedwriter = new BufferedWriter(outputstreamwriter);

            String string = null;
            while ((string = bufferedreader.readLine()) != null) {
                bufferedwriter.write(string + '\n');
                bufferedwriter.flush();
            }
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }
}
      

Compile it by using simple command:

javac EchoClient.java

Running server and client using SSL

First copy certificate file that you created before into working directory and run server with these parameters (notice that you have to change keyStore name and/or trustStrorePassword if you specified different options creating certificate:

java -Djavax.net.ssl.keyStore=mySrvKeystore -Djavax.net.ssl.keyStorePassword=123456 EchoServer

And now again copy certificate file that you created before into working directory and run client with these parameters (notice that you have to change keyStore name and/or trustStrorePassword if you specified different options creating certificate:

java -Djavax.net.ssl.trustStore=mySrvKeystore -Djavax.net.ssl.trustStorePassword=123456 EchoClient

If you want SSL debug information just add these parameters when running server and/or client:

-Djava.protocol.handler.pkgs=com.sun.net.ssl.internal.www.protocol -Djavax.net.debug=ssl

Playing with server and client

Now just type any string on client console and press return. The same string has to appear on server console.

Copyright

This document is copyrighted to Tomas Vilda. You can use it in all ways, but don't change this section and allways include it.

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