card: First code to actually create openpgp keys.

* tools/gpg-card.c (generate_all_openpgp_card_keys): Add demo key
generation.
(generate_key): Allow generatiing one OpenPGP key.
--

This does now allows to create a single OpenPGP key optioanlly with a
specified parameter.  For example to create an auth key:

  gpg-card generate --algo=ed25519 OPENPGP.3

Using option --force will overwrite and already existing key.
scdaemon does here take care of swicthing the key attributes before
generating the key.

TODO: We need to add some more stuff to app-openpgp so that the user
is not annoyed by beeing asked to enter the Admin-PIN twice (change
the key attributes clear the verification state).  gpg's key
generation also needs some tweaks for using an existing card key which
has no key stub in private-keys-v1.d.

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

tools/gpg-card.c

@@ -2140,7 +2140,7 @@ generate_all_openpgp_card_keys (card_info_t info, char **algos)
    * tell gpg to use them to create the OpenPGP keyblock. */
   /* generate_keypair (ctrl, 1, NULL, info.serialno, want_backup); */
   (void)want_backup;
-  err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
+  err = scd_genkey ("OPENPGP.1", 1, NULL, NULL);
 
  leave:
   restore_forced_chv1 (&forced_chv1);
@@ -2172,22 +2172,8 @@ generate_key (card_info_t info, const char *keyref, int force,
           err = ask_replace_keys (NULL);
           if (err)
             goto leave;
+          force = 1;
         }
-
-      log_debug ("current algo is: %s\n", kinfo->keyalgo);
-      if (algo)
-        {
-          log_debug ("setting algo to: %s\n", algo);
-          /* OpenPGP cards require us to set the key attributes prior
-           * to generation because the generate command does not take
-           * key attributes.  Actually this should be hidden by
-           * scd/app-openpgp but that is not the case.  */
-
-
-
-        }
-      goto leave;
-      /* err = generate_openpgp (info); */
     }
 
   err = scd_genkey (keyref, force, algo, NULL);

tools/gpg-card.h

@@ -1,5 +1,5 @@
 /* gpg-card.h - Common definitions for the gpg-card-tool
- * Copyright (C) 2019 g10 Code GmbH
+ * Copyright (C) 2019, 2020 g10 Code GmbH
  *
  * This file is part of GnuPG.
  *