CardOS 5.3 driver

Hello all,
we got several CardOS 5.3 cards that I tried to implement support for in 
OpenSC. The initial detection is already merged [1].

The approach used CardOS 5.0 was not working everywhere so before 
submitting the pull request with all the changes, I would like to hear 
some feedback on some questionable parts and preferable verify that the 
changes are not breaking anything that worked with CardOS 5.0 as 
originally implemented years ago (adding szikora, who implemented 
initial CardOS 5.0 support in PR#170) or if some of the concepts in new 
cards work also in the old ones.

All changes are in my branch [2] are in four commits

The first two make the signatures working:
  * Separately detect 5.3 version and use p1 = 0x41 for security 
environment -- will it work also in the old cards?
  * Remove SC_ALGORITHM_NEED_USAGE which prevented using 
cardos_compute_signature() with 5.3 cards. Does 5.0 or older cards need 
that?

The last two changes are more hackish and used to make decipher 
mechanisms working (it looks like the card strips all the padding). Or 
is there any possibility to disable in OpenSC RSA_X_509 raw decipher 
mechanisms for this driver?

Comments, thoughts?

[1] https://github.com/OpenSC/OpenSC/commit/ac96e73
[2] https://github.com/Jakuje/OpenSC/commits/jjelen-cardos53

Regards,
-- 
Jakub Jelen
Software Engineer
Security Technologies
Red Hat

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