gpg: Prepare revocation keys for use with v5 keys.
* g10/packet.h (struct revocation_key): Add field 'fprlen'. * g10/parse-packet.c (parse_revkeys): Set fprlen and allow for v5 keys. Also fix reading of unitialized data at place where MAX_FINGERPRINT_LEN is used. * g10/revoke.c (gen_desig_revoke): Allow for v5 keys and use fprlen. Do an explicit compare to avoid reading unitialized data. * g10/sig-check.c (check_revocation_keys): Use the fprlen. * g10/getkey.c (merge_selfsigs_main): Do an explicit copy to avoid reading unitialized data. * g10/import.c (revocation_present): Use fprlen. * g10/keyedit.c (show_key_with_all_names): Use fprlen. (menu_addrevoker): Use fprlen. Allow for v5 keys. * g10/keygen.c (keygen_add_revkey): Use fprlen. (parse_revocation_key): Allow for v5 keys. * g10/keyid.c (keyid_from_fingerprint): Allow for v5 keys. Print a better error message in case of bogus fingerprints. * g10/keylist.c (print_revokers): Use fprlen.
The reading of uninitialized data is harmless but we better fix it to
make valgrind happy. More serious was that we always passed
MAX_FINGERPRINT_LEN but we will need to support 20 and 32 octet
fingerprints and MAX_FINGERPRINT_LEN would be too large for a v4.
- Signed-off-by: Werner Koch <firstname.lastname@example.org>