dsasigtest.java

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package MIDlets;

import java.io.*;
import java.util.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import javax.microedition.rms.*;

//import XMLDsig.*;

import org.kxml.*;
import org.kxml.parser.*;
import org.kxml.kdom.*;

public class DSASigTest extends MIDlet implements CommandListener {
   
  private Display display;

  // Three on-screen command buttons.
  private Command cancelCommand;
  private Command doneCommand;
  private Command fetchCommand;

  // TextField allows the user to input URL.
  private TextField textField;

  // The fetch truncates after 2048 bytes to avoid using
  // too much memory. 
  private int length = 2048;

  public DSASigTest() throws Exception {

    // Initialize display and command objects.
    display = Display.getDisplay(this);
    cancelCommand = new Command("CANCEL", Command.CANCEL, 1);
    doneCommand = new Command("DONE", Command.CANCEL, 1);
    fetchCommand = new Command("FETCH", Command.SCREEN, 1);
  }

  /**
   * Ask for URL in the initial screen.
   **/
  public void startApp() {

    // Form with TextField to ask for URL.
    Form form = new Form("DSA Sig Test");
    textField = new TextField("URL:", "",
                              80, TextField.ANY);
    form.append( textField );

    // Two buttons on the form.
    form.addCommand(cancelCommand);
    form.addCommand(fetchCommand);

    // The CommandListener is this MIDlet itself.
    form.setCommandListener( (CommandListener) this);

    // Display the form on the LCD screen.
    display.setCurrent(form);

  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }

  /**
   * Handle events generated by the Commands in the GUI.
   **/
  public void commandAction(Command command, Displayable screen) {

    if (command == cancelCommand) {
      // Quit this MIDlet if "CANCEL" button is pressed.
      destroyApp(false);
      notifyDestroyed();
    } else if (command == doneCommand) {
      // "DONE" is the same as "CANCEL"
      destroyApp(false);
      notifyDestroyed();
    } else if (command == fetchCommand) {
      try {
        // Get the target URL from the TextField.
        String url = "http://" + textField.getString();
        url = url.trim();

        HttpConnection conn = (HttpConnection) Connector.open( url );
        conn.setRequestMethod(HttpConnection.GET);

        // Get the response stream from the server.
        DataInputStream is = conn.openDataInputStream();
  
        InputStreamReader reader = new InputStreamReader(is);
        XmlParser parser = new XmlParser (reader);
        Document doc = new Document();
        doc.parse(parser);
        Element signedMesg = doc.getRootElement();

        String mesg = signedMesg.getElement("mesg").getText();
        String digest = signedMesg.getElement("Signature").getElement("SignedInfo").getElement("DigestValue").getText();

        String key_g = signedMesg.getElement("Signature").getElement("KeyInfo").getElement("KeyValue").getElement("DSAKeyValue").getElement("G").getText();
        String key_p = signedMesg.getElement("Signature").getElement("KeyInfo").getElement("KeyValue").getElement("DSAKeyValue").getElement("P").getText();
        String key_q = signedMesg.getElement("Signature").getElement("KeyInfo").getElement("KeyValue").getElement("DSAKeyValue").getElement("Q").getText();
        String key_y = signedMesg.getElement("Signature").getElement("KeyInfo").getElement("KeyValue").getElement("DSAKeyValue").getElement("Y").getText();

        String sig_r = signedMesg.getElement("Signature").getElement("SignatureValue").getElement("R").getText();
        String sig_s = signedMesg.getElement("Signature").getElement("SignatureValue").getElement("S").getText();

        // Close response stream.
        is.close();

//        if ( digest.equals(DSASigUtil.getDigest(mesg)) ) {
//          mesg = mesg + "\nDigest is verified";
//          if ( DSASigUtil.verify(digest, sig_r, sig_s,
//                                 key_g, key_p, key_q, key_y) ) {
//            mesg = mesg + "\nSignature is verified";
//          } else {
//            mesg = mesg + "\nSignature is failed";
//          }
//        } else {
//          mesg = mesg + "\nDigest is failed";
//        }

        TextBox textBox = new TextBox("Message", null,
                                      length, TextField.ANY);
        textBox.setString( mesg );
        textBox.addCommand(doneCommand);
        textBox.setCommandListener( (CommandListener) this);
        display.setCurrent(textBox);
        conn.close();
      } catch (Exception e) {
        System.out.print(e.getMessage());
        e.printStackTrace();
      }
    }
  }

}