Evan Summers's Blog

Java SSL Sockets

Let's build a trivial client/server demo using SSLServerSocket and SSLSocket as provided by the Java Secure Socket Extension (JSSE). We create a self-signed public key certificate for the server using keytool, and install this on the client.

Click here to read "Enigma, a public key expose"
Part of the "Jelly Beans" part of a trilogy in 42 parts

Code Snippet

We implement the client as follows.

public class EnigmaClient extends Thread {
    EnigmaSocket enigmaSocket;
    KeyStore keyStore;
    KeyManager[] keyManagers;
    TrustManager[] trustManagers;
    SSLContext sslContext;
    
    public void init() throws Exception {
        initKeyManagers();
        initTrustManagers();
        initSSLContext();
    }
    
    public void connect(String host, int port) throws Exception {
        SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
        Socket clientSocket = sslSocketFactory.createSocket(host, port);
        this.enigmaSocket = new EnigmaSocket(clientSocket);
    }
    ...
}

where the keystore containing the server's digital certificate eg. created using keytool, is loaded from a resource or file, and a KeyManagerFactory and TrustManagerFactory are initialised with the keyStore instance. Finally, an SSLContext is initialised with key managers and trust managers, and this is used to create SSL socket connections.

Comments

This work is licensed under a Creative Commons License.