JavaCard OS • Find the data back in Buffer

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Find the data back in Buffer

Posted: Fri May 26, 2017 11:05 pm

by Kabin

I have a problem about APDU buffer. When I select my applet, there are "CLA INS P1 P2 Lc Data" in the buffer, but when I tried to check the PIN code, this buffer array didn't have my PIN code in the data field. I only got "CLA INS P1 P2 Le". Why didn't it contain my PIN code? Need I do other operation to get this?

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byte[] buffer = apdu.getBuffer();

Re: Find the data back in Buffer

Posted: Sat May 27, 2017 5:26 am

by choimillen

Please add this command:

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apdu.setIncomingAndReceive();

Re: Find the data back in Buffer

Posted: Sat May 27, 2017 5:53 am

by Kabin

Well, I found I have made a stupid mistake. I missed this line

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apdu.setIncomingAndReceive();

Thanks for your help, choimillen.

Re: Find the data back in Buffer

Posted: Sun May 28, 2017 11:04 pm

by UNKNwYSHSA

choimillen wrote:Please add this command:
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apdu.setIncomingAndReceive();

You need to make sure that all data bytes are received, maybe you need the method apdu.receiveBytes() to receive all your data bytes.