* scd/app-nks.c (find_fid_by_keyref): Factor keyref parsing out to ...
(parse_keyref): new.
(do_readcert): Use new function instead of partly duplicated code.
Make detection of keygrip more robust.
(do_readkey): Make detection of keygrip more robust.
(do_with_keygrip): Use get_nks_tag.
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Also added a couple of comments.
(cherry picked from commit b92b3206e72b635fd815eaf85e7acc67c2a52ffe)