JavaCard OS

Posted: **Thu Nov 26, 2015 5:37 am**

I was wondering if i could send back some data from the java card applet when it is selected.

Since select() method returns a boolean value, I don't know how to return data bytes from it.

Can anyone help me with this? i want the applet to return a simple byte array along with the status word 9000 (which is default for success), when i send the select command to the card.

ie, when i send the following command

00 A4 04 00 06 01 02 03 04 05 06

i want a response like,

01 02 03 04 90 00

(first four bytes are the data returned from the applet)

Thanks in advance.

Posted: **Thu Nov 26, 2015 7:34 am**

Code: Select all

public void process(APDU apdu) {
      if (selectingApplet()) {
         apdu.getBuffer()[0] = 0x01;
         apdu.getBuffer()[1] = 0x02;
         apdu.getBuffer()[2] = 0x03;
         apdu.getBuffer()[3] = 0x04;
         apdu.setOutgoingAndSend((short)0, (short)4);
         return;
      }
       ...

Posted: **Fri Nov 27, 2015 5:59 am**

Thanks @rena2019. It works!

Posted: **Fri Nov 27, 2015 6:01 am**

Code: Select all

public void process(APDU apdu) 
{ 
  byte[] buf = apdu.getBuffer(); 
  if (selectingApplet())
       { 
          //send  data in the buffer 
          return; 
       } 
}

JavaCard OS

Is it possible to return some data along with the status word 9000 on selecting an applet in javacard?

Is it possible to return some data along with the status word 9000 on selecting an applet in javacard?

Re: Is it possible to return some data along with the status word 9000 on selecting an applet in javacard?

Re: Is it possible to return some data along with the status word 9000 on selecting an applet in javacard?

Re: Is it possible to return some data along with the status word 9000 on selecting an applet in javacard?