gpg: Add experimental AKL method "wkd" and option --with-wkd-hash.
* g10/getkey.c (parse_auto_key_locate): Add method "wkd". (get_pubkey_byname): Implement that method. Also rename a variable. * g10/call-dirmngr.c (gpg_dirmngr_wkd_get): New. * g10/keyserver.c (keyserver_import_wkd): New. * g10/test-stubs.c (keyserver_import_wkd): Add stub. * g10/gpgv.c (keyserver_import_wkd): Ditto. * g10/options.h (opt): Add field 'with_wkd_hash'. (AKL_WKD): New. * g10/gpg.c (oWithWKDHash): New. (opts): Add option --with-wkd-hash. (main): Set that option. * g10/keylist.c (list_keyblock_print): Implement that option.
The Web Key Directory is an experimental feature to retrieve a key via
https. It is similar to OpenPGP DANE but also uses an encryption to
reveal less information about a key lookup.
For example the URI to lookup the key for Joe.Doe@Example.ORG is:
https://example.org/.well-known/openpgpkey/ hu/example.org/iy9q119eutrkn8s1mk4r39qejnbu3n5q
(line has been wrapped for rendering purposes). The hash is a
z-Base-32 encoded SHA-1 hash of the mail address' local-part. The
address wk@gnupg.org can be used for testing.
- Signed-off-by: Werner Koch <wk@gnupg.org>