gpg: Add experimental support for an issuer fpr.

* common/openpgpdefs.h (SIGSUBPKT_ISSUER_FPR): New.
* g10/build-packet.c (build_sig_subpkt_from_sig): Add arg PKSK and
insert the issuer fpr if needed.
* g10/sign.c (write_signature_packets): Pass signing key.
(make_keysig_packet): Ditto.
(update_keysig_packet): Ditto.
* g10/parse-packet.c (dump_sig_subpkt): Print issuer fpr.
(parse_one_sig_subpkt): Detect issuer fpr.
(can_handle_critical): Add issuer fpr.
* g10/mainproc.c (check_sig_and_print): Try to get key via fingerprint.
* g10/gpgv.c (keyserver_import_fprint): New stub.
* g10/test-stubs.c (keyserver_import_fprint): New stub.
--

This support is enabled with the --rfc4880bis option and intended to
test to recently proposed issuer fpr.

Signed-off-by: Werner Koch <[email protected]>

1 files changed, 3 insertions, 3 deletions

diff --git a/g10/sign.c b/g10/sign.c
index a4974be85..3a96f0f1f 100644
--- a/g10/sign.c
+++ b/g10/sign.c
@@ -690,7 +690,7 @@ write_signature_packets (SK_LIST sk_list, IOBUF out, gcry_md_hd_t hash,
 
       if (sig->version >= 4)
         {
-          build_sig_subpkt_from_sig (sig);
+          build_sig_subpkt_from_sig (sig, pk);
           mk_notation_policy_etc (sig, NULL, pk);
         }
 
@@ -1456,7 +1456,7 @@ make_keysig_packet (PKT_signature **ret_sig, PKT_public_key *pk,
       sig->expiredate=sig->timestamp+duration;
     sig->sig_class = sigclass;
 
-    build_sig_subpkt_from_sig( sig );
+    build_sig_subpkt_from_sig (sig, pksk);
     mk_notation_policy_etc (sig, pk, pksk);
 
     /* Crucial that the call to mksubpkt comes LAST before the calls
@@ -1559,7 +1559,7 @@ update_keysig_packet( PKT_signature **ret_sig,
        automagically lower any sig expiration dates to correctly
        correspond to the differences in the timestamps (i.e. the
        duration will shrink).  */
-    build_sig_subpkt_from_sig( sig );
+    build_sig_subpkt_from_sig (sig, pksk);
 
     if (mksubpkt)
       rc = (*mksubpkt)(sig, opaque);