gpg: Implement v5 keys and v5 signatures.

* g10/build-packet.c (gpg_mpi_write): New optional arg
R_NWRITTEN.  Allow NULL for OUT.  Change all callers.
(do_key): Support v5 keys.
(build_sig_subpkt_from_sig): Support 32 byte fingerprints.
* g10/parse-packet.c (parse_signature): First try to set the keyid
from the issuer fingerprint.
(parse_key): Support v5 keys.
(create_gpg_control): Better make sure to always allocate the static
size of the struct in case future compilers print warnings.
* g10/keyid.c (hash_public_key): Add v5 support.
(keyid_from_pk): Ditto.
(keyid_from_fingerprint): Ditto.
(fingerprint_from_pk): Ditto.
* g10/keygen.c (KEYGEN_FLAG_CREATE_V5_KEY): New.
(pVERSION, pSUBVERSION): New.
(add_feature_v5): New.
(keygen_upd_std_prefs): Call it.
(do_create_from_keygrip): Add arg keygen_flags and support the v5
flag.
(common_gen): Support the v5 flag.
(parse_key_parameter_part): New flags v4 and v5.
(parse_key_parameter_string): Add args for version and subversion.
(read_parameter_file): New keywords "Key-Version" and
"Subkey-Version".
(quickgen_set_para): Add arg 'version'.
(quick_generate_keypair, generate_keypair): Support version parms.
(do_generate_keypair): Support v5 key flag.
(generate_subkeypair): Ditto.
(generate_card_subkeypair): Preparse for keyflags.
(gen_card_key): Ditto.
* g10/sig-check.c (check_signature2): Add args extrahash and
extrahashlen.
(check_signature_end): Ditto.
(check_signature_end_simple): Ditto.  Use them.
* g10/mainproc.c (proc_plaintext): Put extra hash infor into the
control packet.
(do_check_sig): Add args extrahas and extrahashlen and pass them on.
(issuer_fpr_raw): Support 32 byte fingerprint.
(check_sig_and_print): get extra hash data and pass it on.
--

Note that this is only basic support and requires more fine
tuning/fixing.

Signed-off-by: Werner Koch <wk@gnupg.org>

g10/sign.c

@@ -49,6 +49,10 @@
 #define LF "\n"
 #endif
 
+/* Hack */
+static int recipient_digest_algo;
+
+
 /* A type for the extra data we hash into v5 signature packets.  */
 struct pt_extra_hash_data_s
 {
@@ -60,10 +64,6 @@ struct pt_extra_hash_data_s
 typedef struct pt_extra_hash_data_s *pt_extra_hash_data_t;
 
 
-/* Hack */
-static int recipient_digest_algo;
-
-
 /*
  * Create notations and other stuff.  It is assumed that the strings in
  * STRLIST are already checked to contain only printable data and have
@@ -746,8 +746,8 @@ write_plaintext_packet (iobuf_t out, iobuf_t inp,
           (*r_extrahash)->mode = pt->mode;
           (*r_extrahash)->timestamp = pt->timestamp;
           (*r_extrahash)->namelen = pt->namelen;
-          /* Note that the last byte or NAME won't be initialized
-           * becuase we don't need it.  */
+          /* Note that the last byte of NAME won't be initialized
+           * because we don't need it.  */
           memcpy ((*r_extrahash)->name, pt->name, pt->namelen);
         }
       pt->buf = NULL;