Automating and integrating GPG

[Andreas Heinlein]

Am 20.09.2017 um 09:02 schrieb Werner Koch:
> On Mon, 18 Sep 2017 23:45, dkg at fifthhorseman.net said:
>
>> I don't know how much smartcard interaction gpgme supports, though.
> Everything you need.  Have a look at GPA's smartcard features.  I assume
> it is the most advanced GUI to handle the OpenPGP card as well as
> several other cards.  For example it includes full support for the
> Telesec card with their NullPIN feature.
Interesting. I haven't found anything smartcard related in the GPGME
docs. I am really not good at C, but I took a look at the sources of
GPA, specifically the change_pin function in cm-openpgp.c, and it looks
like GPA is using assuan protocol through gpgme here:

char command[100];
snprintf (command, sizeof command, "SCD PASSWD%s %d",
                 reset_mode? " --reset":"", pinno+1);
err = gpgme_op_assuan_transact_ext (gpgagent, command,
                                          
NULL, NULL, NULL, NULL, NULL, NULL,
                                           &operr);

I hadn't thought of that possibility. Python-GPG should support this,
too - take a look at assuan.py in the examples folder. But I haven't yet
found any documentation of the assuan commands you need here.
This probably isn't as easy as a Python programmer might expect...

Andreas
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