Best is develop PKCS#11 provider and not OpenPGP specific.
As PKCS#11 is the interface applications use.
You will be able to use GPG using [1] if you like without more effort.

Alon.

[1] http://gnupg-pkcs11.sourceforge.net/

On 10/15/08, Jan Suhr <[EMAIL PROTECTED]> wrote:
> Hi!
>  Currently we are developing an USB stick based on the OpenPGP smart card
>  as an open source project. This is basically a simple smart card adapter
>  based on the IC FT2232D (http://www.ftdichip.com/Products/FT2232C.htm).
>  Linux includes modules to communicate with the FT2232 in general but not
>  specifically for its usage as a smart card adapter. Also other open
>  source libraries exist for this chip
>  (http://www.intra2net.com/de/produkte/opensource/ftdi/).
>
>  While the hardware is not any problem we are wondering about the
>  development of an appropriate software driver. Which features and which
>  specifications such a driver would have to fulfill? What is the average
>  effort to develop such a driver? Is there any documentation to follow or
>  is it possible to get any support by the community?
>
>  Thanks!
>  _______________________________________________
>  opensc-devel mailing list
>  opensc-devel@lists.opensc-project.org
>  http://www.opensc-project.org/mailman/listinfo/opensc-devel
>
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