/* -*-c-*-
*
- * $Id: f-niceprime.c,v 1.4 2004/04/01 21:28:41 mdw Exp $
+ * $Id: f-niceprime.c,v 1.6 2004/04/08 01:36:15 mdw Exp $
*
* Prime fields with efficient reduction for special-form primes
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: f-niceprime.c,v $
- * Revision 1.4 2004/04/01 21:28:41 mdw
- * Normal basis support (translates to poly basis internally). Rewrite
- * EC and prime group table generators in awk, so that they can reuse data
- * for repeated constants.
- *
- * Revision 1.3 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.)
- *
- * Revision 1.2 2004/03/27 17:54:11 mdw
- * Standard curves and curve checking.
- *
- * Revision 1.1 2004/03/27 00:04:46 mdw
- * Implement efficient reduction for pleasant-looking primes.
- *
- */
-
/*----- Header files ------------------------------------------------------*/
#include <mLib/sub.h>
}
static mp *finv(field *ff, mp *d, mp *x)
- { fctx *f = (fctx *)ff; mp_gcd(0, 0, &d, f->r.p, x); return (d); }
+ { fctx *f = (fctx *)ff; d = mp_modinv(d, x, f->r.p); return (d); }
static mp *freduce(field *ff, mp *d, mp *x)
{ fctx *f = (fctx *)ff; return (mpreduce_do(&f->r, d, x)); }
/* --- Field operations table --- */
-static field_ops fops = {
+static const field_ops fops = {
FTY_PRIME, "niceprime",
fdestroy, frand, field_stdsamep,
freduce, field_id,