Re: Is Le not logged

ISO 7816-4 [1] answers most of your questions in Section "5.3 APDU message structure"
and Section 6 - Basic Interindustry Commands"

Note the class of the command determines if Lc and/or Le are present. The command your
are looking at is "CA" see "6.9 GET DATA command" The protocol T=0 or T=1 also comes
into play.

As you read through 7816 you will not how complicated it is. And even worse when it is
a proprietary command, where CLA byte is 8X or 9X. Thus there is a lot of code that
your card may not be using, but other cards do.

[1] http://cardwerk.com/iso-7816-smart-card-standard/
or other source.


On 8/8/2018 7:38 AM, Amit wrote:
> Dear Devels,
> 
> I see this after connecting Atos card 5.3
> # /usr/local/bin/opensc-tool -a -vvv
> 0x7fd485e77880 17:20:53.811 [opensc-tool] apdu.c:378:sc_single_transmit: CLA:0, INS:CA, P1:1, P2:8D, data(0) (nil)
> 0x7fd485e77880 17:20:53.811 [opensc-tool] reader-pcsc.c:284:pcsc_transmit: reader 'Gemalto PC Twin Reader 00 00'
> 0x7fd485e77880 17:20:53.811 [opensc-tool] reader-pcsc.c:285:pcsc_transmit:
> Outgoing APDU (5 bytes):
> 00 CA 01 8D 02 .....
> 0x7fd485e77880 17:20:53.811 [opensc-tool] reader-pcsc.c:213:pcsc_internal_transmit: called
> 0x7fd485e77880 17:20:53.815 [opensc-tool] reader-pcsc.c:294:pcsc_transmit:
> Incoming APDU (4 bytes):
> 01 80 90 00 ....
> 
> What is 02 in CAPDU (00 CA 01 8D 02)? Is this Le?
>    P1=01(1st parameter), P2=8D(2nd parameter)
> 
> Is RAPDU correct?  (01 80 90 00)
> a. Asked P2 was 8D, but came=80. Does this mean card does not have data starting from 01 8D?
> b. Do I need to ask communication specs from manufacturer of card for same.
> 
> Too early to say but sorry I  feel there is lot of repetitive code we can optimize it.
> 
> 
> -- 
> Thanks
> Amit Kumar
> !!If you stumble, get back up.
> What happened yesterday, no longer matters.
> Today is another day to move closer to your GOAL!!
> 
> 
> 
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-- 

  Douglas E. Engert  <[email protected]>


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