/* -*-c-*-
*
- * $Id: ec.c,v 1.8 2004/04/01 12:50:09 mdw Exp $
+ * $Id$
*
* Elliptic curve definitions
*
* (c) 2001 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: ec.c,v $
- * Revision 1.8 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 1.7 2004/03/27 17:54:11 mdw
- * Standard curves and curve checking.
- *
- * Revision 1.6 2004/03/23 15:19:32 mdw
- * Test elliptic curves more thoroughly.
- *
- * Revision 1.5 2004/03/21 22:52:06 mdw
- * Merge and close elliptic curve branch.
- *
- * Revision 1.4.4.2 2004/03/20 00:13:31 mdw
- * Projective coordinates for prime curves
- *
- * Revision 1.4.4.1 2003/06/10 13:43:53 mdw
- * Simple (non-projective) curves over prime fields now seem to work.
- *
- * Revision 1.4 2003/05/15 23:25:59 mdw
- * Make elliptic curve stuff build.
- *
- * Revision 1.3 2002/01/13 13:48:44 mdw
- * Further progress.
- *
- * Revision 1.2 2001/05/07 17:29:44 mdw
- * Treat projective coordinates as an internal representation. Various
- * minor interface changes.
- *
- * Revision 1.1 2001/04/29 18:12:33 mdw
- * Prototype version.
- *
- */
-
/*----- Header files ------------------------------------------------------*/
#include "ec.h"
int ec_samep(ec_curve *c, ec_curve *d)
{
- return (field_samep(c->f, d->f) && c->ops == d->ops && EC_SAMEP(c, d));
+ return (c == d || (field_samep(c->f, d->f) &&
+ c->ops == d->ops && EC_SAMEP(c, d)));
}
/* --- @ec_create@ --- *
*/
int ec_stdsamep(ec_curve *c, ec_curve *d)
-{
- return (MP_EQ(c->a, d->a) && MP_EQ(c->b, d->b));
-}
+ { return (MP_EQ(c->a, d->a) && MP_EQ(c->b, d->b)); }
/* --- @ec_idin@, @ec_idout@, @ec_idfix@ --- *
*
}
ec *ec_idfix(ec_curve *c, ec *d, const ec *p)
-{
- EC_COPY(d, p);
- return (d);
-}
+ { EC_COPY(d, p); return (d); }
-/* --- @ec_projin@, @ec_projout@ --- *
+/* --- @ec_projin@, @ec_projout@, @ec_projfix@ --- *
*
* Arguments: @ec_curve *c@ = pointer to an elliptic curve
* @ec *d@ = pointer to the destination
else {
mp *x, *y, *z, *zz;
field *f = c->f;
- z = F_INV(f, MP_NEW, p->z);
- zz = F_SQR(f, MP_NEW, z);
- z = F_MUL(f, z, zz, z);
- x = F_MUL(f, d->x, p->x, zz);
- y = F_MUL(f, d->y, p->y, z);
- mp_drop(z);
- mp_drop(zz);
+ if (p->z == f->one) {
+ d->x = F_OUT(f, d->x, p->x);
+ d->y = F_OUT(f, d->y, p->y);
+ } else {
+ z = F_INV(f, MP_NEW, p->z);
+ zz = F_SQR(f, MP_NEW, z);
+ z = F_MUL(f, z, zz, z);
+ x = F_MUL(f, d->x, p->x, zz);
+ y = F_MUL(f, d->y, p->y, z);
+ mp_drop(z);
+ mp_drop(zz);
+ d->x = F_OUT(f, x, x);
+ d->y = F_OUT(f, y, y);
+ }
mp_drop(d->z);
- d->x = F_OUT(f, x, x);
- d->y = F_OUT(f, y, y);
d->z = 0;
}
return (d);
{
if (EC_ATINF(p))
EC_SETINF(d);
- else if (d->z == c->f->one)
+ else if (p->z == c->f->one)
EC_COPY(d, p);
else {
mp *z, *zz;
mp_drop(d->z);
d->z = MP_COPY(f->one);
}
- return (d);
+ return (d);
}
/* --- @ec_stdsub@ --- *
*/
ec *ec_neg(ec_curve *c, ec *d, const ec *p)
-{
- EC_IN(c, d, p);
- EC_NEG(c, d, d);
- return (EC_OUT(c, d, d));
-}
+ { EC_IN(c, d, p); EC_NEG(c, d, d); return (EC_OUT(c, d, d)); }
/* --- @ec_add@ --- *
*
*/
ec *ec_dbl(ec_curve *c, ec *d, const ec *p)
-{
- EC_IN(c, d, p);
- EC_DBL(c, d, d);
- return (EC_OUT(c, d, d));
-}
+ { EC_IN(c, d, p); EC_DBL(c, d, d); return (EC_OUT(c, d, d)); }
/* --- @ec_check@ --- *
*
do x = F_RAND(c->f, x, r); while (!EC_FIND(c, d, x));
mp_drop(x);
if (grand_range(r, 2)) EC_NEG(c, d, d);
- return (EC_OUT(c, d, d));
+ return (EC_OUT(c, d, d));
}
/*----- That's all, folks -------------------------------------------------*/