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authorzautrix <zautrix>2004-10-19 20:16:14 (UTC)
committer zautrix <zautrix>2004-10-19 20:16:14 (UTC)
commiteca49bb06a71980ef61d078904573f25890fc7f2 (patch) (side-by-side diff)
treec5338e3b12430248979a9ac2c1c7e6646ea9ecdf /pwmanager/libcrypt/crypt/module.c
parent53cc32b6e7b1f672bf91b2baf2df6c1e8baf3e0a (diff)
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Initial revision
Diffstat (limited to 'pwmanager/libcrypt/crypt/module.c') (more/less context) (ignore whitespace changes)
-rw-r--r--pwmanager/libcrypt/crypt/module.c200
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diff --git a/pwmanager/libcrypt/crypt/module.c b/pwmanager/libcrypt/crypt/module.c
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+/* 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;
+}