Hello,
at the moment I'm investigating the max_x_size problem. Here is a short
preview of things I found so far. More detailed results will be attached
to #269.
Current state of affairs:
1. currently I concentrate only on USB CCID devices
2. there are in fact three different kinds
* TPDU
* Short APDU
* Short and Extended APDU
3. TPDU and Ext-APDU devices don't need special handling.
It's for sure that these devices would at least transmit EVERY
Short APDU (255/256) (A fact to remember)
References that confirm that fact: [1] [2]
4. looking closer at the third kind of devices (only Short APDU),
let to an interesting result. The following list will show.
* fist column is dwMaxCCIDMessageLength
* second column is a file under pcsclite/trunk/Drivers/ccid/readers
261 Aktiv_Rutoken_Magistra.txt
261 Gemalto_PDT.txt
261 GnD_StarSignCardToken550.txt
261 JCOP41V221.txt
261 Oberthur-CosmoCard1.txt
261 Oberthur-CosmoCard.txt
261 Philips_SmartMX.txt
271 ACR122U_PICC.txt
271 Akasa_AK-CR-03.txt
271 Aktiv_Rutoken_ECP.txt
271 Alcor_SCR001.txt
271 ATMEL_AT91SC192192CT-USB.txt
271 ATMEL_AT91SO.txt
271 ATMEL_AT98SC032CT.txt
271 ATMEL_VaultIC420.txt
271 ATMEL_VaultIC440.txt
271 ATMEL_VaultIC460.txt
271 AU9520.txt
271 CardMan3021.txt
271 CardMan3121.txt
271 CardMan3621.txt
271 CardMan3821.txt
271 CardMan4321.txt
271 CardMan5121.txt
271 CardMan5125.txt
271 CardMan5321.txt
271 CardMan6121.txt
271 CherrySmartBoardXX1X.txt
271 CherrySmartTerminalXX1X.txt
271 CherrySmartTerminalXX7X.txt
271 CherryST1044U.txt
271 CherryXX33.txt
271 CherryXX44.txt
271 Covadis_Auriga.txt
271 FujitsuSiemens_SmartCard_Keyboard_USB_2A.txt
271 FujitsuSiemens_SmartCard_USB_2A.txt
271 GemPC433_SL.txt
271 KAAN_SIM_III.txt
271 mIDentity.txt
271 Omnikey_noname1.txt
271 Sitecom_MD-010.txt
271 Smart_SBV280.txt
271 SpringCard_CrazyWriter.txt
271 SpringCard_CSB6_Basic.txt
271 SpringCard_CSB6_Secure.txt
271 SpringCard_CSB6_Ultimate.txt
271 SpringCard_EasyFinger_Standard.txt
271 SpringCard_EasyFinger_Ultimate.txt
271 SpringCard_Prox_N_Roll.txt
271 Teo.txt
271 Todos_AGM2_CCID.txt
271 Todos_Cx00.txt
271 Vasco_DP905.txt
271 Xiring_Leov2.txt
271 Xiring_XI-SIGN_6000.txt
271 Xiring_XI-SIGN.txt
278 GemProxDU_contactless.txt
278 GemProxSU_contactless.txt
280 GnD_StarSignCardToken350.txt
512 TianYu_CCID_SmartKey.txt
512 VMware_Virtual_USB_CCID.txt
2048GoldKey_PIV_Token.txt
Assuming that devices with dwMaxCCIDMessageLength=261 are all USB_Tokens
and not readers. Then it looks like that all these readers of third kind
can also handle 255/256.
All in all this let to the conclusion that all known USB CCID devices
can handle at least 255/256. (data set is retrieved from libccid source
code)
And this in turn would make the description in opensc.conf very brief.
Maybe like this: "If you have a usb device, then you can go with the
defaults."
Regards
Andre
[1] http://www.usb.org/developers/devclass_docs/DWG_Smart-Card_CCID_Rev110.pdf
[2] http://pcsclite.alioth.debian.org/ccid_extended_apdu.html
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