Initial revision

1 files changed, 200 insertions, 0 deletions

diff --git a/pwmanager/libcrypt/crypt/module.c b/pwmanager/libcrypt/crypt/module.c
new file mode 100644
index 0000000..e98c36e
--- a/dev/null
+++ b/pwmanager/libcrypt/crypt/module.c
@@ -0,0 +1,200 @@
+/* module.c - Module management for libgcrypt.
+ * Copyright (C) 2003 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser general Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include <assert.h>
+#include <config.h>
+#include <errno.h>
+#include "g10lib.h"
+
+#define MODULE_ID_MIN 600
+
+/* Internal function.  Generate a new, unique module ID for a module
+   that should be inserted into the module chain starting at
+   MODULES.  */
+static gcry_err_code_t
+_gcry_module_id_new (gcry_module_t modules, unsigned int *id_new)
+{
+  /* FIXME, what should be the ID of the first module registered by
+     the user?  */
+  unsigned int id_min = MODULE_ID_MIN, id_max = (unsigned int) -1, mod_id;
+  gcry_err_code_t err = GPG_ERR_NO_ERROR;
+  gcry_module_t module;
+
+  /* Search for unused ID.  */
+  for (mod_id = id_min; mod_id < id_max; mod_id++)
+    {
+      /* Search for a module with the current ID.  */
+      for (module = modules; module; module = module->next)
+	if (mod_id == module->mod_id)
+	  break;
+
+      if (! module)
+	/* None found -> the ID is available for use.  */
+	break;
+    }
+
+  if (mod_id < id_max)
+    /* Done.  */
+    *id_new = mod_id;
+  else
+    /* No free ID found.  */
+    err = GPG_ERR_INTERNAL;
+
+  return err;
+}
+
+/* Add a module specification to the list ENTRIES.  The new module has
+   it's use-counter set to one.  */
+gcry_err_code_t
+_gcry_module_add (gcry_module_t *entries, unsigned int mod_id,
+		  void *spec, gcry_module_t *module)
+{
+  gcry_err_code_t err = 0;
+  gcry_module_t entry;
+
+  if (! mod_id)
+    err = _gcry_module_id_new (*entries, &mod_id);
+
+  if (! err)
+    {
+      entry = gcry_malloc (sizeof (struct gcry_module));
+      if (! entry)
+	err = gpg_err_code_from_errno (errno);
+    }
+
+  if (! err)
+    {
+      /* Fill new module entry.  */
+      entry->flags = 0;
+      entry->counter = 1;
+      entry->spec = spec;
+      entry->mod_id = mod_id;
+
+      /* Link it into the list.  */
+      entry->next = *entries;
+      entry->prevp = entries;
+      if (*entries)
+	(*entries)->prevp = &entry->next;
+      *entries = entry;
+
+      /* And give it to the caller.  */
+      if (module)
+	*module = entry;
+    }
+  return err;
+}
+
+/* Internal function.  Unlink CIPHER_ENTRY from the list of registered
+   ciphers and destroy it.  */
+static void
+_gcry_module_drop (gcry_module_t entry)
+{
+  *entry->prevp = entry->next;
+  if (entry->next)
+    entry->next->prevp = entry->prevp;
+
+  gcry_free (entry);
+}
+
+/* Lookup a module specification by it's ID.  After a successfull
+   lookup, the module has it's resource counter incremented.  */
+gcry_module_t 
+_gcry_module_lookup_id (gcry_module_t entries, unsigned int mod_id)
+{
+  gcry_module_t entry;
+
+  for (entry = entries; entry; entry = entry->next)
+    if (entry->mod_id == mod_id)
+      {
+	entry->counter++;
+	break;
+      }
+
+  return entry;
+}
+
+/* Lookup a module specification.  After a successfull lookup, the
+   module has it's resource counter incremented.  FUNC is a function
+   provided by the caller, which is responsible for identifying the
+   wanted module.  */
+gcry_module_t 
+_gcry_module_lookup (gcry_module_t entries, void *data,
+		     gcry_module_lookup_t func)
+{
+  gcry_module_t entry;
+
+  for (entry = entries; entry; entry = entry->next)
+    if ((*func) (entry->spec, data))
+      {
+	entry->counter++;
+	break;
+      }
+
+  return entry;
+}
+
+/* Release a module.  In case the use-counter reaches zero, destroy
+   the module.  Passing MODULE as NULL is a dummy operation (similar
+   to free()). */
+void
+_gcry_module_release (gcry_module_t module)
+{
+  if (module && ! --module->counter)
+    _gcry_module_drop (module);
+}
+
+/* Add a reference to a module.  */
+void
+_gcry_module_use (gcry_module_t module)
+{
+  ++module->counter;
+}
+
+/* If LIST is zero, write the number of modules identified by MODULES
+   to LIST_LENGTH and return.  If LIST is non-zero, the first
+   *LIST_LENGTH algorithm IDs are stored in LIST, which must be of
+   according size.  In case there are less cipher modules than
+   *LIST_LENGTH, *LIST_LENGTH is updated to the correct number.  */
+gcry_err_code_t
+_gcry_module_list (gcry_module_t modules,
+		   int *list, int *list_length)
+{
+  gcry_err_code_t err = GPG_ERR_NO_ERROR;
+  gcry_module_t module;
+  int length, i;
+
+  for (module = modules, length = 0; module; module = module->next, length++);
+
+  if (list)
+    {
+      if (length > *list_length)
+	length = *list_length;
+
+      for (module = modules, i = 0; i < length; module = module->next, i++)
+	list[i] = module->mod_id;
+
+      if (length < *list_length)
+	*list_length = length;
+    }
+  else
+    *list_length = length;
+
+  return err;
+}