wk at gnupg
May 11, 2009, 10:38 AM
Post #1 of 1
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Omnikey readers and 2048 bit keys
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Hi!
While testing the new 2048 bit smartcards I figured that all Omnikey
based readers (e.g. CardMan, Cherry keyboards) won't work. SCM readers
work just fine. See
http://pcsclite.alioth.debian.org/ccid_extended_apdu.html
for details. The interesting thing is that they seem to work on Windows
(at least Cardman 3121 and 5121): This seems to be due to tricks in the
Windows driver. I guess they are switching the reader to TPDU mode or
some raw mode. Simply trying to use extended length APDU exchange does
not work.
I started to do a protocol analysis of the CCID data send over USB but
due to problems with Windows XP's resource manager when running under
KVM, I have postponed it for now. If you want to work on it, there is a
little tool in GnuPG's SVN: tools/ccidmon.c to prins the CCID protocol
data in an easy readable format.
Shalom-Salam,
Werner
--
Die Gedanken sind frei. Auschnahme regelt ein Bundeschgesetz.
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