Method doCommunication

examples/gssClient.java:223–271

Communicate with the server. First send a message that has been wrapped with context.wrap(), then verify the signature block which the server sends back.

(InputStream serverIn,
            OutputStream serverOut)

     * the server sends back.
     **/
    public static void doCommunication(InputStream serverIn,
            OutputStream serverOut) {

        MessageProp messagInfo = new MessageProp(false);
        byte[] inToken  = new byte[0];
        byte[] outToken = null;
        byte[] buffer;
        int err = 0;

        try {

            String msg = "Hello Server, this is the client!";
            buffer = msg.getBytes();

            /* Set privacy to "true" and use the default QOP */
            messagInfo.setPrivacy(true);

            outToken = context.wrap(buffer, 0, buffer.length, messagInfo);
            err = GssUtil.WriteToken(serverOut, outToken);
            if (err == 0) {
                System.out.println("Sent message to server ('" +
                        msg + "')");

                /* Read signature block from the server */ 
                inToken = GssUtil.ReadToken(serverIn);
                System.out.println("Received sig block from server...");

                GSSName serverInfo = context.getTargName();
                System.out.println("Message from " + serverInfo.toString() +
                    " arrived.");
                GssUtil.printSubString("Was it encrypted? ", messagInfo.getPrivacy());
                GssUtil.printSubString("Duplicate Token? ", messagInfo.isDuplicateToken());
                GssUtil.printSubString("Old Token? ", messagInfo.isOldToken());
                GssUtil.printSubString("Gap Token? ", messagInfo.isGapToken());

                /* Verify signature block */
                context.verifyMIC(inToken, 0, inToken.length, buffer, 0, 
                    buffer.length, messagInfo);
                System.out.println("Verified MIC from server");

            } else {
                System.out.println("Error sending message to server...");
            }

        } catch (GSSException e) {
            System.out.println("GSS-API error in per-message calls: " + 
                    e.getMessage());
        }
    }
}