NFC Secure Element Example
Article Metadata
Code Example
Source file: Media:Ticket.zip
Compatibility
Platform(s): Series 40
Article
Created: geri-m
(01 May 2008)
Last edited: hamishwillee
(25 Mar 2013)
Warning: This example was created for the NFC implementation provided on Series 40 devices, and may include use of features not yet available for NFC on Symbian devices.
The code shows a basic MIDlet that communicates with the internal secure element.
In order to run this example you also need the appropriate Java Card Example (For Emulator/Real Phone).
In order to run this on the phone, you do have to unlock it and you need as well a code signing certificate to sign this MIDlet. In the emulator you have to set the security domain (Tools => Preferences) to "MAXIMUM". (Shown at NFC Forum Developer Training, WIMA 2008 and NFC-Congress Hagenberg 2008) Download appropriate NetBeans Project: File:Ticket.zip.
package at.nfcresearch.wima.examples;
import java.io.IOException;
import javax.microedition.contactless.ContactlessException;
import javax.microedition.contactless.sc.ISO14443Connection;
import javax.microedition.io.Connector;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class Ticketing extends MIDlet implements CommandListener {
// APDUS in order to communicate with the JavaCard Applet
private byte[] SELECT = {(byte) 0x00, (byte) 0xA4, (byte) 0x04, (byte) 0x00, (byte) 0x09, (byte) 0x74, (byte) 0x69, (byte) 0x63, (byte) 0x6B, (byte) 0x65, (byte) 0x74, (byte) 0x69, (byte) 0x6E, (byte) 0x67, (byte) 0x00};
private byte[] INS_INC = {(byte) 0x00, (byte) 0x01, (byte) 0x00, (byte) 0x00};
private byte[] INS_DEC = {(byte) 0x00, (byte) 0x02, (byte) 0x00, (byte) 0x00};
private byte[] INS_READ = {(byte) 0x00, (byte) 0x03, (byte) 0x00, (byte) 0x00, (byte) 0x01};
// UI Stuff
private Command exitCommand;
private Command incCommand;
private Command decCommand;
private Form form;
private StringItem info;
private StringItem value;
// Connetivity with Secure Element
private String uri;
private ISO14443Connection conn;
public Ticketing() {
exitCommand = new Command("Exit", Command.EXIT, 1);
incCommand = new Command("INC", Command.ITEM, 2);
decCommand = new Command("DEC", Command.ITEM, 3);
info = new StringItem("Info:", "-- just started --");
value = new StringItem("Value:", "-- just started --");
form = new Form("NFC-Research: Secure Element Demo");
form.append(info);
form.append(value);
form.addCommand(exitCommand);
form.addCommand(incCommand);
form.addCommand(decCommand);
form.setCommandListener(this);
try {
// get URI of the secure element from the system
uri = System.getProperty("internal.se.url");
// Opening the Conneciton to the Secure Element
conn = (ISO14443Connection) Connector.open(uri);
// Selecting the Applet
byte[] result = conn.exchangeData(SELECT);
// Check if select was oaky
if (result[0] == (byte) 0x90 && result[1] == (byte) 0x00) {
info.setText("Select okay");
}
readValue();
} catch (IOException ie) {
info.setText("Could not Select: " + ie.toString());
} catch (ContactlessException ce) {
info.setText("Error on Select: " + ce.toString());
} catch (SecurityException se) {
info.setText("Error, Application not trusted (sign MIDLet!): " + se.toString());
}
}
public void startApp() {
Display.getDisplay(this).setCurrent(form);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
public void commandAction(Command command, Displayable displayable) {
if (command == exitCommand) {
try {
if (conn != null) {
conn.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
destroyApp(false);
notifyDestroyed();
}
// Increase Value in Secure Element
if (command == incCommand) {
if (incValue()) {
readValue();
}
}
// decrease Value in Secure Element
if (command == decCommand) {
if (decValue()) {
readValue();
}
}
}
/**
* Method for increasing the value in the JavaCard Applet
*/
private boolean incValue() {
byte[] result = null;
try {
result = conn.exchangeData(INS_INC);
} catch (IOException io) {
displayAlert("IO-Error during Increasing value: " + io.toString(), AlertType.ERROR);
return false;
} catch (ContactlessException ce) {
displayAlert("CL-Error during Increasing value: " + ce.toString(), AlertType.ERROR);
return false;
}
// check if read was okay
if (result.length == 2 && result[0] == (byte) 0x90 && result[1] == (byte) 0x00) {
info.setText("INC okay");
value.setText("" + result[0]);
return true;
} else {
displayAlert("Error Increasing Value", AlertType.ERROR);
info.setText("ERROR while Increasing!");
value.setText("n/a");
return false;
}
}
/**
* Method for decreasing the value in the JavaCard Applet
*/
private boolean decValue() {
byte[] result = null;
try {
result = conn.exchangeData(INS_DEC);
} catch (IOException io) {
displayAlert("IO-Error during Reading value: " + io.toString(), AlertType.ERROR);
return false;
} catch (ContactlessException ce) {
displayAlert("CL-Error during Reading value: " + ce.toString(), AlertType.ERROR);
return false;
}
if (result.length == 2 && result[0] == (byte) 0x90 && result[1] == (byte) 0x00) {
info.setText("decrease okay");
value.setText("" + result[0]);
return true;
} else {
displayAlert("Error Decreasing Value", AlertType.ERROR);
info.setText("ERROR while Decreasing!");
value.setText("n/a");
return false;
}
}
/**
* Method for reading the value in the JavaCard Applet
*/
private void readValue() {
// Read value again
byte[] result = null;
try {
result = conn.exchangeData(INS_READ);
} catch (IOException io) {
displayAlert("IO-Error during Reading value: " + io.toString(), AlertType.ERROR);
} catch (ContactlessException ce) {
displayAlert("CL-Error during Reading value: " + ce.toString(), AlertType.ERROR);
}
// check if read was okay
if (result.length == 3 && result[1] == (byte) 0x90 && result[2] == (byte) 0x00) {
info.setText("read okay");
value.setText("" + result[0]);
} else {
displayAlert("Error Reading Value", AlertType.ERROR);
info.setText("ERROR while Reading!");
value.setText("n/a");
}
}
private void displayAlert(String error, AlertType type) {
Alert err = new Alert(form.getTitle(), error, null, type);
Display.getDisplay(this).setCurrent(err, form);
}
}
Vyeluri - About NFC secure element
I have read many articles about NFC and I have written a paper about NFC. I would like to know more about the secure element, how data is encrypted example many banks started using credit card with secure element. How card information is stored and what cryptography algorithm they using? Is it same to every card or it differs from card to card??
Thank you.vyeluri 09:52, 17 November 2012 (EET)
Hamishwillee - This article was written in 2008!
Hi As this article was written in 2008 it is likely that the author is no longer "watching" for comments, and may even have left the community. The best place to ask this sort of question is on the NFC forum.
Regards
Hamishhamishwillee 06:07, 20 November 2012 (EET)