common: Extend the new get_keyalgo_string function

* common/openpgp-oid.c (openpgp_oid_or_name_to_curve): New.
(get_keyalgo_string): Use it.
--

We do not always have an OID, so except the name or the alias of the
curve as well.  This creates a second entry mapping to the same name
but that does not matter.

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

common/openpgp-oid.c

@@ -389,9 +389,9 @@ openpgp_curve_to_oid (const char *name, unsigned int *r_nbits)
 }
 
 
-/* Map an OpenPGP OID to the Libgcrypt curve NAME.  Returns NULL for
+/* Map an OpenPGP OID to the Libgcrypt curve name.  Returns NULL for
-   unknown curve names.  Unless CANON is set we prefer an alias name
+ * unknown curve names.  Unless CANON is set we prefer an alias name
-   here which is more suitable for printing.  */
+ * here which is more suitable for printing.  */
 const char *
 openpgp_oid_to_curve (const char *oidstr, int canon)
 {
@@ -408,6 +408,27 @@ openpgp_oid_to_curve (const char *oidstr, int canon)
 }
 
 
+/* Map an OpenPGP OID, name or alias to the Libgcrypt curve name.
+ * Returns NULL for unknown curve names.  Unless CANON is set we
+ * prefer an alias name here which is more suitable for printing.  */
+const char *
+openpgp_oid_or_name_to_curve (const char *oidname, int canon)
+{
+  int i;
+
+  if (!oidname)
+    return NULL;
+
+  for (i=0; oidtable[i].name; i++)
+    if (!strcmp (oidtable[i].oidstr, oidname)
+        || !strcmp (oidtable[i].name, oidname)
+        || (oidtable[i].alias &&!strcmp (oidtable[i].alias, oidname)))
+      return !canon && oidtable[i].alias? oidtable[i].alias : oidtable[i].name;
+
+  return NULL;
+}
+
+
 /* Return true if the curve with NAME is supported.  */
 static int
 curve_supported_p (const char *name)
@@ -528,7 +549,7 @@ const char *
 get_keyalgo_string (enum gcry_pk_algos algo,
                     unsigned int nbits, const char *curve)
 {
-  const char *prefix = NULL;
+  const char *prefix;
   int i;
   char *name, *curvebuf;
 
@@ -537,9 +558,11 @@ get_keyalgo_string (enum gcry_pk_algos algo,
     case GCRY_PK_RSA:   prefix = "rsa"; break;
     case GCRY_PK_ELG:   prefix = "elg"; break;
     case GCRY_PK_DSA:	prefix = "dsa"; break;
+    case GCRY_PK_ECC:
     case GCRY_PK_ECDH:
     case GCRY_PK_ECDSA:
     case GCRY_PK_EDDSA: prefix = "";    break;
+    default:            prefix = NULL;  break;
     }
 
   if (prefix && *prefix && nbits)
@@ -569,7 +592,7 @@ get_keyalgo_string (enum gcry_pk_algos algo,
         }
 
       /* Not yet in the table - add it.  */
-      curvename = openpgp_oid_to_curve (curve, 0);
+      curvename = openpgp_oid_or_name_to_curve (curve, 0);
       if (curvename)
         name = xasprintf ("%s", curvename);
       else if (curve)

common/util.h

@@ -232,6 +232,7 @@ int openpgp_oidbuf_is_cv25519 (const void *buf, size_t len);
 int openpgp_oid_is_cv25519 (gcry_mpi_t a);
 const char *openpgp_curve_to_oid (const char *name, unsigned int *r_nbits);
 const char *openpgp_oid_to_curve (const char *oid, int canon);
+const char *openpgp_oid_or_name_to_curve (const char *oidname, int canon);
 const char *openpgp_enum_curves (int *idxp);
 const char *openpgp_is_curve_supported (const char *name,
                                         int *r_algo, unsigned int *r_nbits);