Andreas Krennmair:

[apps/madmutt.git] / crypt-mod.c

diff --git a/crypt-mod.c b/crypt-mod.c
new file mode 100644 (file)
index 0000000..356e3e9
--- /dev/null
+++ b/crypt-mod.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2004 g10 Code GmbH
+ *
+ *     This program is free software; you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation; either version 2 of the License, or
+ *     (at your option) any later version.
+ * 
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program; if not, write to the Free Software
+ *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ */
+
+#include "crypt-mod.h"
+
+/* A type an a variable to keep track of registered crypto modules. */
+typedef struct crypt_module *crypt_module_t;
+
+struct crypt_module
+{
+  crypt_module_specs_t specs;
+  crypt_module_t next, *prevp;
+};
+
+static crypt_module_t modules;
+
+/* Register a new crypto module. */
+void crypto_module_register (crypt_module_specs_t specs)
+{
+  crypt_module_t module_new = safe_malloc (sizeof (*module_new));
+
+  module_new->specs = specs;
+  module_new->next = modules;
+  if (modules)
+    modules->prevp = &module_new->next;
+  modules = module_new;
+}
+
+/* Return the crypto module specs for IDENTIFIER.  This function is
+   usually used via the CRYPT_MOD_CALL[_CHECK] macros. */
+crypt_module_specs_t crypto_module_lookup (int identifier)
+{
+  crypt_module_t module = modules;
+
+  while (module && (module->specs->identifier != identifier))
+    module = module->next;
+
+  return module ? module->specs : NULL;
+}