gpg: Do not use a fixed string for --gpgconf-list:default_pubkey_algo.

* g10/keygen.c (get_default_pubkey_algo): New.
(parse_key_parameter_string): Use it.
* g10/gpg.c (gpgconf_list): Take value from new function.
--

Note that consumers of that gpgconf-list value may need to be adjusted
to that new value.  It should anyway only be used to display the
default algorithm.

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

g10/gpg.c

@@ -1832,7 +1832,7 @@ gpgconf_list (const char *configfile)
   /* The next one is an info only item and should match the macros at
      the top of keygen.c  */
   es_printf ("default_pubkey_algo:%lu:\"%s:\n", GC_OPT_FLAG_DEFAULT,
-             "RSA-2048");
+             get_default_pubkey_algo ());
 
   xfree (configfile_esc);
 }

g10/keygen.c

@@ -152,6 +152,23 @@ static unsigned int get_keysize_range (int algo,
 
 
 
+/* Return the algo string for a default new key.  */
+const char *
+get_default_pubkey_algo (void)
+{
+  if (opt.def_new_key_algo)
+    {
+      if (*opt.def_new_key_algo && !strchr (opt.def_new_key_algo, ':'))
+        return opt.def_new_key_algo;
+      /* To avoid checking that option every time we delay that until
+       * here.  The only thing we really need to make sure is that
+       * there is no colon in the string so that the --gpgconf-list
+       * command won't mess up its output.  */
+      log_info (_("invalid value for option '%s'\n"), "--default-new-key-algo");
+    }
+  return DEFAULT_STD_KEY_PARAM;
+}
+
 
 static void
 print_status_key_created (int letter, PKT_public_key *pk, const char *handle)
@@ -3122,7 +3139,7 @@ parse_key_parameter_string (const char *string, int part,
 
   if (!string || !*string
       || !strcmp (string, "default") || !strcmp (string, "-"))
-    string = opt.def_new_key_algo? opt.def_new_key_algo : DEFAULT_STD_KEY_PARAM;
+    string = get_default_pubkey_algo ();
   else if (!strcmp (string, "future-default"))
     string = FUTURE_STD_KEY_PARAM;
 

g10/main.h

@@ -300,6 +300,7 @@ void keyedit_quick_set_expire (ctrl_t ctrl,
 void show_basic_key_info (KBNODE keyblock);
 
 /*-- keygen.c --*/
+const char *get_default_pubkey_algo (void);
 u32 parse_expire_string(const char *string);
 u32 ask_expire_interval(int object,const char *def_expire);
 u32 ask_expiredate(void);