Re: Typical smartcard response times

On Sun, 9 Feb 2020 15:33:36 +0100, Ludovic Rousseau wrote
> Le dim. 9 févr. 2020 à 14:32, Pali Rohár <[email protected]> a 
> écrit :
> >
> > On Sunday 09 February 2020 13:53:46 Ludovic Rousseau wrote:
> > > Le dim. 9 févr. 2020 à 10:25, Marian Ďurkovič <[email protected]> a écrit :
> 
> > > > Is this expected behaviour? What are typical response times for other smartcards?
> > >
> > > The speed depends on many factors. One of them is the speed between
> > > the card and the reader.
> > > Some cards are faster than others.
> > > Some readers are faster than others.
> > >
> > > What is the ATR of your cards?
> >
> > Hello!
> >
> > In OpenSC project on github is already an open issue for Slovak eID
> > cards: https://github.com/OpenSC/OpenSC/issues/208
> >
> > There is also posted ATR of a card.
> 
> ATR from the github issue is 3B DF 18 00 81 31 FE 58 00 31 B9 64 05 0E
> 01 00 73 B4 01 D3 00 00 00 22
> https://smartcard-atr.apdu.fr/parse?ATR=3BDF18008131FE580031B964050E010073B401D300000022
> 
> So a TA1 of 0x18
> https://ludovicrousseau.blogspot.com/2016/04/atr-statistics-ta1-global-
> encodes-fi.html Fi=372, Di=12, 31 cycles/ETU (129032 bits/s at 4.00 
> MHz, 161290 bits/s for fMax=5 MHz)
> 
> 129032 bits/s s not terribly fast.
> The reader you use, Gemalto PC Twin Reader, can do dwMaxDataRate: 
> 344086 bps https://ccid.apdu.fr/ccid/readers/GemPCTwin.txt
> 
> My next point is the card processing speed. Maybe the card OS and
> application is slow.
> 
> Or maybe OpenSC (and the official driver) is sub-optimal.
> But that is a lot of work to work on that.

Thanks for the info - yes, ATR is exactly as mentioned above.

It's quite strange, since there is very little difference in response times for common functions regardless of result size:
- C_GetAttributeValue for CKA_ID (i.e. just a few bytes) takes 571 msec
- C_GetAttributeValue for CKA_VALUE (2048 bytes certificate) takes 580 msec
- C_FindObjectsInit+C_FindObjects also takes 576 msec

Any tips what to look for (on MAC)?

The above is a serious problem with some applications - for example signing a document in Acrobat results in 2.5 minutes of waiting, since after C_Sign completes, Acrobat tries to verify the signature and pulls all 3 certificates from eID 6 times (once for each level in certification hierarchy).

Perhaps I should try to modify pkcs11-spy.so into a caching library, serving repeated requests for static objects from memory cache and not from slow eID card...


Thanks & kind regards,
MD



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