Problem with pin verification on CAC card using APDU commands in .NET

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I am new to using APDU commands. I am writing a .Net application and I need to verify the Pin on a CAC card using APDU commands.

What I have tried:

I am using the following APDU commands

CLA = 0x00,
INS = 0x20,
P1 = 0x00,
P2 = 0x80

I am getting a “6E00” Response – “Class not supported”. The commands work fine on a PIV card but not for the CAC card. I have tried different CLA but have not been able to get it to work. Does anyone know what I need to do different for the CAC card?

Posted 27-Jul-20 9:24am

Member 14749454

Updated 29-Jul-20 7:09am

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Richard MacCutchan · Answer 1 · 2020-07-27T10:05:00

Solution 1

You will probably find information faster at Common Access Card (CAC)[^].

Posted 27-Jul-20 10:05am

Richard MacCutchan

Comments

Member 14749454 29-Jul-20 13:07pm

Thank you for the link. I drilled down through the link you provided, but it took me to documentation I have previously looked at. I will go back through it again.

Richard MacCutchan 29-Jul-20 14:39pm

The issue is clearly that something you are sending is not valid, so the only way to resolve it is to check the documentation to find out why. If the CAC site has a help forum then that is much the best place for your question.