The clean way to organise this is:

(a) An application in the terminal issues APDUs

(b) The software layer receiving the APDU knows whether the card is being
operated with T=0 or T=1, and sends information down to the card driver as
appropriate; if T=0 and a case 4 APDU, the APDU is split into a Case 3 TPDU
(which sends data to the card) and a Case 2 GET RESPONSE

(c) The card driver interfaces with a card reader driver

(d) The card reader driver handles the interface out to the card reader

Change the card - change only the card driver in the PC; change the card
reader - change only the card reader driver in the PC

Write the layer below the application strictly to 7816-4 rules, and cards
that don't comply (e.g cards that require a GET RESPONSE as part of
processing every APDU (if that really is true)) are not acceptable.

Its sad that we cannot yet have a universal card driver, but its going to be
true for some time to come.

Regards,

Peter T
Bristol UK

----- Original Message -----
From: "Laurent Boulard" <laurent.boulardlouveciennes.tt.slb.com>
To: <sclinuxlinuxnet.com>
Sent: Wednesday, August 01, 2001 8:08 AM
Subject: Re: MUSCLE Is 61xx handled in your driver?

> David Corcoran wrote:
>
> >I think you should handle the Get Response if your APDU looks like the
> >following:
> >
> >CLA INS p1 p2 p3 lentx xx xx xx xx xx lenrx
> >
> >Is this correct ?
> >
>
> In the perfect world yes ! but, sadly, people sometimes doesn't follow
> correctly the ISO7816 or misunderstood it. I have cards (W4SC as an
> example) which send back a GET RESPONSE even for a APDU without data.
> This is really annoying as I have to modify my application to take care
> of this kind of cards.
>
> May be the highler level must be modify to hide this behaviour. But,
> from another point of view, it is interesting to know that you have a
> card with GET RESPONSE because sometimes those cards must run in
> terminals without management of the GET REPONSE apdus.
>
> --
> Laurent Boulard
> Research Engineer
> Advanced Research
> SchlumbergerSema (Louveciennes)
> Tel: +33 (0)1 30 08 45 97
> Fax: +33 (0)1 30 08 45 24
> perl -e 'print(pack("h38","34f6e67627164757c6164796f6e63702b3d292"))'
>
>
>
>
> ***************************************************************
> Linux Smart Card Developers - M.U.S.C.L.E.
> (Movement for the Use of Smart Cards in a Linux Environment)
> http://www.linuxnet.com/smartcard/index.html
> ***************************************************************
>

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