* scd/app-nks.c (find_fid_by_keyref): Disable the cache for now.
(readcert_from_ef): Considere an all zero certificate as not found.
(do_sign): Support ECC and the ESIGN application.
--
This allows me to create qualified signatures using my Telesec card.
There is of course more work to do but this is the first step.
Note: The design of the FID cache needs to be reconsidered. Until
that the lookup here has been disabled. The do_sign code should be
revamped to be similar to what we do in app-p15.
GnuPG-bug-id: 5219, 4938, 6252
Backported-from-master: 07eaf006c2
5cd25f4ca4