gpg: First working support for keyboxes.
* g10/getkey.c (get_pubkey_fast): Improve the assertion. * kbx/keybox.h: Include iobuf.h. * kbx/keybox-blob.c (keyboxblob_uid): Add field OFF. (KEYBOX_WITH_OPENPGP): Remove use of this macro. (pgp_create_key_part_single): New. (pgp_temp_store_kid): Change to use the keybox-openpgp parser. (pgp_create_key_part): Ditto. (pgp_create_uid_part): Ditto. (pgp_create_sig_part): Ditto. (pgp_create_blob_keyblock): Ditto. (_keybox_create_openpgp_blob): Ditto. * kbx/keybox-search.c (keybox_get_keyblock): New. * kbx/keybox-update.c (keybox_insert_keyblock): New. * g10/keydb.c (parse_keyblock_image): (keydb_get_keyblock): Support keybox. (build_keyblock_image): New. (keydb_insert_keyblock): Support keybox. * kbx/kbxutil.c (import_openpgp, main): Add option --dry-run and print a kbx file to stdout. * kbx/keybox-file.c (_keybox_read_blob2): Allow keyblocks up to 10^6 bytes.
Import and key listing does now work with the keybox format. It is
still quite slow and signature caching is completely missing.
Increasing the maximum allowed length for a keyblock was required due
to a 700k keyblock which inhibited kbxutil to list the file.
kbxutil's option name --import-openpgp is not quite appropriate
because it only creates KBX blobs from OpenPGP data.