common: New helper functions for OpenPGP curve OIDs.

* common/openpgp-oid.c (openpgp_oidbuf_to_str): Factor most code out
to ...
(openpgp_oidbuf_to_str): new.
(openpgp_oidbuf_is_ed25519): New.
(openpgp_oidbuf_is_cv25519): New.
--

At some places it is more convenient (and faster) to directly work on
buffers and avoid the way via opaque MPIs.  These 3 new functions
allow for that.

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

1 files changed, 9 insertions, 1 deletions

diff --git a/common/t-openpgp-oid.c b/common/t-openpgp-oid.c
index cb5709d98..fd9de5dde 100644
--- a/common/t-openpgp-oid.c
+++ b/common/t-openpgp-oid.c
@@ -142,7 +142,15 @@ test_openpgp_oid_to_str (void)
         fail (idx, 0);
       xfree (string);
       gcry_mpi_release (a);
-    }
+
+      /* Again using the buffer variant. */
+      string = openpgp_oidbuf_to_str (samples[idx].der, samples[idx].der[0]+1);
+      if (!string)
+        fail (idx, gpg_error_from_syserror ());
+      if (strcmp (string, samples[idx].string))
+        fail (idx, 0);
+      xfree (string);
+}
 
 }