/* -*-c-*-
*
- * $Id: ec.c,v 1.7 2004/03/27 17:54:11 mdw Exp $
+ * $Id: ec.c,v 1.10 2004/04/08 01:36:15 mdw Exp $
*
* Elliptic curve definitions
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: ec.c,v $
- * 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"
-#include "ec-exp.h"
/*----- Trivial wrappers --------------------------------------------------*/
+/* --- @ec_samep@ --- *
+ *
+ * Arguments: @ec_curve *c, *d@ = two elliptic curves
+ *
+ * Returns: Nonzero if the curves are identical (not just isomorphic).
+ *
+ * Use: Checks for sameness of curves. This function does the full
+ * check, not just the curve-type-specific check done by the
+ * @sampep@ field operation.
+ */
+
+int ec_samep(ec_curve *c, ec_curve *d)
+{
+ return (field_samep(c->f, d->f) && c->ops == d->ops && EC_SAMEP(c, d));
+}
+
/* --- @ec_create@ --- *
*
* Arguments: @ec *p@ = pointer to an elliptic-curve point
/*----- Standard curve operations -----------------------------------------*/
+/* --- @ec_stdsamep@ --- *
+ *
+ * Arguments: @ec_curve *c, *d@ = two elliptic curves
+ *
+ * Returns: Nonzero if the curves are identical (not just isomorphic).
+ *
+ * Use: Simple sameness check on @a@ and @b@ curve members.
+ */
+
+int ec_stdsamep(ec_curve *c, ec_curve *d)
+{
+ return (MP_EQ(c->a, d->a) && MP_EQ(c->b, d->b));
+}
+
/* --- @ec_idin@, @ec_idout@, @ec_idfix@ --- *
*
* Arguments: @ec_curve *c@ = pointer to an elliptic curve
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
mp_drop(d->z);
d->z = MP_COPY(f->one);
}
- return (d);
+ return (d);
}
/* --- @ec_stdsub@ --- *
return (EC_OUT(c, d, d));
}
-/* --- @ec_imul@, @ec_mul@ --- *
- *
- * Arguments: @ec_curve *c@ = pointer to an elliptic curve
- * @ec *d@ = pointer to the destination point
- * @const ec *p@ = pointer to the generator point
- * @mp *n@ = integer multiplier
- *
- * Returns: The destination @d@.
- *
- * Use: Multiplies a point by a scalar, returning %$n p$%. The
- * @imul@ variant uses internal representations for argument
- * and result.
- */
-
-ec *ec_imul(ec_curve *c, ec *d, const ec *p, mp *n)
-{
- ec t = EC_INIT;
-
- EC_COPY(&t, p);
- if (t.x && (n->f & MP_BURN))
- t.x->f |= MP_BURN;
- MP_SHRINK(n);
- EC_SETINF(d);
- if (MP_LEN(n) == 0)
- ;
- else {
- if (n->f & MP_NEG)
- EC_NEG(c, &t, &t);
- if (MP_LEN(n) < EXP_THRESH)
- EXP_SIMPLE(*d, t, n);
- else
- EXP_WINDOW(*d, t, n);
- }
- EC_DESTROY(&t);
- return (d);
-}
-
-ec *ec_mul(ec_curve *c, ec *d, const ec *p, mp *n)
-{
- EC_IN(c, d, p);
- ec_imul(c, d, d, n);
- return (EC_OUT(c, d, d));
-}
-
/*----- That's all, folks -------------------------------------------------*/