/* -*-c-*-
*
- * $Id: group.h,v 1.3 2004/04/04 19:04:11 mdw Exp $
+ * $Id$
*
* General cyclic group abstraction
*
* (c) 2004 Straylight/Edgeware
*/
-/*----- Licensing notice --------------------------------------------------*
+/*----- Licensing notice --------------------------------------------------*
*
* This file is part of Catacomb.
*
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
- *
+ *
* Catacomb 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 Library General Public License for more details.
- *
+ *
* You should have received a copy of the GNU Library General Public
* License along with Catacomb; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: group.h,v $
- * Revision 1.3 2004/04/04 19:04:11 mdw
- * Raw I/O of elliptic curve points and group elements.
- *
- * Revision 1.2 2004/04/03 03:32:05 mdw
- * General robustification.
- *
- * Revision 1.1 2004/04/01 12:50:09 mdw
- * Add cyclic group abstraction, with test code. Separate off exponentation
- * functions for better static linking. Fix a buttload of bugs on the way.
- * Generally ensure that negative exponents do inversion correctly. Add
- * table of standard prime-field subgroups. (Binary field subgroups are
- * currently unimplemented but easy to add if anyone ever finds a good one.)
- *
- */
-
#ifndef CATACOMB_GROUP_H
#define CATACOMB_GROUP_H
} group_expfactor;
typedef struct group_ops {
+
+ /* --- General information --- */
+
unsigned ty; /* Type of this group */
+ const char *name; /* Textual name string */
/* --- Memory management --- */
mp *(*toint)(group */*g*/, mp */*d*/, ge */*x*/);
int (*fromint)(group */*g*/, ge */*d*/, mp */*x*/);
int (*toec)(group */*g*/, ec */*d*/, ge */*x*/);
- int (*fromec)(group */*g*/, ge */*d*/, ec */*p*/);
+ int (*fromec)(group */*g*/, ge */*d*/, const ec */*p*/);
int (*tobuf)(group */*h*/, buf */*b*/, ge */*x*/);
int (*frombuf)(group */*h*/, buf */*b*/, ge */*d*/);
int (*toraw)(group */*h*/, buf */*b*/, ge */*x*/);
GTY_EC /* Elliptic curve group */
};
+#define G_NAME(g) (g)->ops->name
+#define G_TYPE(g) (g)->ops->ty
+
#define G_DESTROYGROUP(g) (g)->ops->destroygroup((g))
#define G_CREATE(g) (g)->ops->create((g))
#define G_COPY(g, d, x) (g)->ops->copy((g), (d), (x))
*
* Arguments: @group *g@ = abstract group
* @ge *d@ = destination pointer
- * @ec *p@ = elliptic curve point
+ * @const ec *p@ = elliptic curve point
*
* Returns: Zero for success, @-1@ on failure.
*
* coordinate.
*/
-extern int group_stdfromec(group */*g*/, ge */*d*/, ec */*p*/);
+extern int group_stdfromec(group */*g*/, ge */*d*/, const ec */*p*/);
/*----- Prime field subgroups ---------------------------------------------*/
group *group_prime(const gprime_param */*gp*/);
+/*----- Binary field subgroups --------------------------------------------*/
+
+typedef gprime_param gbin_param;
+
+/* --- @group_binary@ --- *
+ *
+ * Arguments: @const gbin_param *gb@ = group parameters
+ *
+ * Returns: A pointer to the group, or null.
+ *
+ * Use: Constructs an abstract group interface for a subgroup of a
+ * prime field. Group elements are @mp *@ pointers.
+ */
+
+group *group_binary(const gbin_param */*gp*/);
+
/*----- Elliptic curve groups ---------------------------------------------*/
/* --- @group_ec@ --- *