smartcards and GPGME

Andre Heinecke aheinecke at
Mon May 14 08:02:19 CEST 2018


On Sunday, May 13, 2018 6:26:04 PM CEST Jacob Adams wrote:
> As part of a program I'm writing this summer for GSoC, I'd like to be
> able to both move gpg private keys to a smartcard and generate keys on
> the smartcard from an application. While this can be done from gpg, it
> doesn't look like I can do so from GPGME or any other wrappers that
> exist. Have I missed something or is this simply not possible yet?
> While I could wrap this functionality of gpg, I'd really prefer not to
> and I'd rather not drop the user to a gpg prompt if I don't have to.

This is both pretty complicated thorugh GPGME, as there is indeed not a direct 
interface. Kleopatra and GPA use the "AssuanEngine" of GPGME to connect to the 
gpg-agent's assuan interface and issue / parse commands directly through that 

You might want to take a look at GPA's implementation:;a=blob;f=src/cm-openpgp.c

Alternatively instead of wrapping gpg (and using the complicated edit 
interface) you could also wrap "gpg-connect-agent" and issue commands to 
scdaemon through that.

Best Regards,

Andre Heinecke |  ++49-541-335083-262  |
Intevation GmbH, Neuer Graben 17, 49074 Osnabrück | AG Osnabrück, HR B 18998
Geschäftsführer: Frank Koormann, Bernhard Reiter, Dr. Jan-Oliver Wagner
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