scd: Extend KEYPAIRINFO with an algorithm string.
* scd/app-openpgp.c (send_keypair_info): Emit the algo string as part of a KEYPAIRINFO. * scd/command.c (do_readkey): Ditto. * scd/app-piv.c (do_readkey): Ditto. * scd/app-nks.c (do_learn_status_core): Ditto. (struct fid_cache_s): Add field algostr. (flush_fid_cache): Release it. (keygripstr_from_pk_file): Fill it and add it to the cache. Use a single exit label. * scd/app-help.c (app_help_get_keygrip_string_pk): Add new arg r_algostr. Change all callers.
This is helpful so that callers do not need to parse the key for this
basic information. Use "scd readkey --info-only" to return the info
status line instead of the key material; using just --info returns the
info in addition to the key material.
- Signed-off-by: Werner Koch <wk@gnupg.org>