card: Print usage info for each key.

* tools/card-call-scd.c (learn_status_cb): Handle extended
KEYPARIRINFO.
* tools/card-tool.h (struct key_info_s): Add field 'usage'.
* tools/gpg-card-tool.c (list_one_kinfo): Show usage flags.

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

tools/card-call-scd.c

@@ -890,28 +890,59 @@ learn_status_cb (void *opaque, const char *line)
       else if (!memcmp (keyword, "KEYPAIRINFO", keywordlen))
         {
           /* The format of such a line is:
-           *   KEYPARINFO <hexgrip> <keyref>
+           *   KEYPAIRINFO <hexgrip> <keyref> [usage]
            */
-          const char *hexgrp = line;
+          char *hexgrp, *usage;
 
-          while (*line && !spacep (line))
+          line_buffer = pline = xstrdup (line);
-            line++;
-          while (spacep (line))
-            line++;
 
-          keyref = line;
+          hexgrp = pline;
+          while (*pline && !spacep (pline))
+            pline++;
+          while (spacep (pline))
+            pline++;
+
+          keyref = pline;
+          while (*pline && !spacep (pline))
+            pline++;
+          if (*pline)
+            {
+              *pline++ = 0;
+              while (spacep (pline))
+                pline++;
+              usage = pline;
+              while (*pline && !spacep (pline))
+                pline++;
+              *pline = 0;
+            }
+          else
+            usage = "";
 
           /* Check whether we already have an item for the keyref.  */
           kinfo = find_kinfo (parm, keyref);
           if (!kinfo)  /* New entry.  */
             kinfo = create_kinfo (parm, keyref);
-          else /* Existing entry - clear the grip.  */
+          else /* Existing entry - clear grip and usage  */
-            memset (kinfo->grip, 0, sizeof kinfo->grip);
+            {
+              memset (kinfo->grip, 0, sizeof kinfo->grip);
+              kinfo->usage = 0;
+            }
 
           /* Set or update the grip.  Note that due to the
            * calloc/memset an erroneous too short grip will be nul
            * padded on the right. */
           unhexify_fpr (hexgrp, kinfo->grip, sizeof kinfo->grip);
+          /* Parse and set the usage.  */
+          for (; *usage; usage++)
+            {
+              switch (*usage)
+                {
+                case 's': kinfo->usage |= GCRY_PK_USAGE_SIGN; break;
+                case 'c': kinfo->usage |= GCRY_PK_USAGE_CERT; break;
+                case 'a': kinfo->usage |= GCRY_PK_USAGE_AUTH; break;
+                case 'e': kinfo->usage |= GCRY_PK_USAGE_ENCR; break;
+                }
+            }
         }
       break;
 

tools/card-tool.h

@@ -127,7 +127,7 @@ struct key_info_s
   unsigned char fprlen;  /* Use length of the next item.  */
   unsigned char fpr[32]; /* The binary fingerprint of length FPRLEN.  */
   u32 created;           /* The time the key was created.  */
-
+  unsigned int usage;    /* Usage flags.  (GCRY_PK_USAGE_*) */
   char keyref[1];        /* String with the keyref (e.g. OPENPGP.1).  */
 };
 typedef struct key_info_s *key_info_t;

tools/gpg-card-tool.c

@@ -621,6 +621,7 @@ list_one_kinfo (key_info_t firstkinfo, key_info_t kinfo, estream_t fp)
   key_info_t ki;
   const char *s;
   gcry_sexp_t s_pkey;
+  int any;
 
   if (firstkinfo && kinfo)
     {
@@ -630,8 +631,25 @@ list_one_kinfo (key_info_t firstkinfo, key_info_t kinfo, estream_t fp)
           tty_fprintf (fp, "[none]\n");
           goto leave;
         }
+
       print_keygrip (fp, kinfo->grip);
-      tty_fprintf (fp, "      keyref .....: %s\n", kinfo->keyref);
+      tty_fprintf (fp, "      keyref .....: %s", kinfo->keyref);
+      if (kinfo->usage)
+        {
+          any = 0;
+          tty_fprintf (fp, "  (");
+          if ((kinfo->usage & GCRY_PK_USAGE_SIGN))
+            { tty_fprintf (fp, "sign"); any=1; }
+          if ((kinfo->usage & GCRY_PK_USAGE_CERT))
+            { tty_fprintf (fp, "%scert", any?",":""); any=1; }
+          if ((kinfo->usage & GCRY_PK_USAGE_AUTH))
+            { tty_fprintf (fp, "%sauth", any?",":""); any=1; }
+          if ((kinfo->usage & GCRY_PK_USAGE_ENCR))
+            { tty_fprintf (fp, "%sencr", any?",":""); any=1; }
+          tty_fprintf (fp, ")");
+        }
+      tty_fprintf (fp, "\n");
+
       if (!scd_readkey (kinfo->keyref, &s_pkey))
         {
           char *tmp = pubkey_algo_string (s_pkey);