JavaCard OS

Posted: **Wed Jul 12, 2017 4:38 pm**

Hi
I have a problem in receiving extended length APDU.
I send an APDU with about 700 bytes but in my applet that I run in virtual reader, I receive only 243 bytes.
The buffer length is always 261, and with T0 inBufferLength is 243 and with T1 inBufferLength is 153.

Can I use extended length in JCIDE?

this is my applet code:

Code: Select all

package myApplet;

import javacard.framework.*;
import javacard.security.*;
import javacardx.crypto.Cipher;
import javacardx.apdu.ExtendedLength;

public class myApplet extends Applet implements ISO7816, ExtendedLength
{
...
   public void process(APDU apdu)
   {
      if(selectingApplet()){
         return;
      }
      
      byte[] buf = apdu.getBuffer();
           short inBufferLength = apdu.setIncomingAndReceive();
           byte p1 = inBuffer[ISO7816.OFFSET_P1];
           byte p2 = inBuffer[ISO7816.OFFSET_P2];
}

Posted: **Thu Jul 13, 2017 12:05 am**

Refer to this code section:

Code: Select all

short readCount = apdu.setIncomingAndReceive();

while ( bytesLeft  >  0){
     // process bytes in buffer[5] to buffer[readCount+4];
     bytesLeft -= readCount;
     readCount = apdu.receiveBytes ( ISO7816.OFFSET_CDATA );
}

You need to call receiveBytes to receive the left bytes.

Posted: **Thu Jul 13, 2017 11:46 am**

Yes, it works.
thank you for quick response!

JavaCard OS

Problem in sending extended APDU

Problem in sending extended APDU

Re: Problem in sending extended APDU

Re: Problem in sending extended APDU