how many reader+cards

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how many reader+cards

J.Witvliet

Hi all,

 

Is there an upperlimit defined regarding the numer of tokens/smartcards attached to a system?

 

In my “normal use case” I was expecting just one, but found out it might be wise to contemplate the possibility of multiple cards.

But is there (in the code) an absolute  maximum defined?

Or is it just limited by the hardware capabilities (read: usb ports) of the PC involved….

 

Hans


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Re: how many reader+cards

Martin Paljak-4

Hello,

On 27/03/14 15:09 , [hidden email] wrote:
> Hi all,
>
> Is there an upperlimit defined regarding the numer of
> tokens/smartcards attached to a system?
If you're wiling to change some constants here and there and
re-compile software, I believe the number could be quite high.

http://superuser.com/questions/371051/what-is-and-how-to-increase-the-maximum-number-of-usb-devices

What is the number you are after? I remember a constant of 255 from
PC/SC lite though..

See r508:
http://anonscm.debian.org/viewvc/pcsclite?view=revision&revision=508



> In my "normal use case" I was expecting just one, but found out it
> might be wise to contemplate the possibility of multiple cards. But
> is there (in the code) an absolute  maximum defined? Or is it just
> limited by the hardware capabilities (read: usb ports) of the PC
> involved....

If you're talking a normal PC, you're just fine. If you're talking
some smartcard backed key sharing and load balancing, you might hit
some limits. But you might then actually get it cheaper by getting a HSM.

Best,


--
Martin
+372 515 6495

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Re: how many reader+cards

Ludovic Rousseau
2014-03-27 16:22 GMT+01:00 Martin Paljak <[hidden email]>:

>
> Hello,
>
> On 27/03/14 15:09 , [hidden email] wrote:
>> Hi all,
>>
>> Is there an upperlimit defined regarding the numer of
>> tokens/smartcards attached to a system?
> If you're wiling to change some constants here and there and
> re-compile software, I believe the number could be quite high.
>
> http://superuser.com/questions/371051/what-is-and-how-to-increase-the-maximum-number-of-usb-devices
>
> What is the number you are after? I remember a constant of 255 from
> PC/SC lite though..

>From pcsc-lite the limit is 16.

>From PCSC/pcsclite.h
/** Maximum readers context (a slot is count as a reader) */
#define PCSCLITE_MAX_READERS_CONTEXTS            16

A feature request is open to use a list instead of a fixed array.
https://alioth.debian.org/tracker/index.php?func=detail&aid=313579&group_id=30105&atid=410088

Bye

--
 Dr. Ludovic Rousseau

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