/* -*-c-*-
*
- * $Id: ec.h,v 1.4.4.2 2004/03/20 00:13:31 mdw Exp $
+ * $Id: ec.h,v 1.6 2004/03/22 02:19:10 mdw Exp $
*
* Elliptic curve definitions
*
/*----- Revision history --------------------------------------------------*
*
* $Log: ec.h,v $
+ * Revision 1.6 2004/03/22 02:19:10 mdw
+ * Rationalise the sliding-window threshold. Drop guarantee that right
+ * arguments to EC @add@ are canonical, and fix up projective implementations
+ * to cope.
+ *
+ * Revision 1.5 2004/03/21 22:52:06 mdw
+ * Merge and close elliptic curve branch.
+ *
+ * Revision 1.4.4.3 2004/03/21 22:39:46 mdw
+ * Elliptic curves on binary fields work.
+ *
* Revision 1.4.4.2 2004/03/20 00:13:31 mdw
* Projective coordinates for prime curves
*
/* --- Elliptic curve operations --- *
*
* All operations (apart from @destroy@ and @in@) are guaranteed to be
- * performed on internal representations of points. Moreover, the second
- * argument to @add@ and @mul@ is guaranteed to be the output of @in@ or
- * @fix@.
+ * performed on internal representations of points.
+ *
+ * (Historical note. We used to guarantee that the second to @add@ and @mul@
+ * was the output of @in@ or @fix@, but this canonification turned out to
+ * make the precomputation in @ec_exp@ too slow. Projective implementations
+ * must therefore cope with a pair of arbitrary points.)
*/
typedef struct ec_ops {
extern ec_curve *ec_prime(field */*f*/, mp */*a*/, mp */*b*/);
extern ec_curve *ec_primeproj(field */*f*/, mp */*a*/, mp */*b*/);
-/* --- @ec_bin@ --- *
+/* --- @ec_bin@, @ec_binproj@ --- *
*
* Arguments: @field *f@ = the underlying field for this elliptic curve
* @mp *a, *b@ = the coefficients for this curve
*
* Returns: A pointer to the curve.
*
- * Use: Creates a curve structure for a non-supersingular elliptic
- * curve defined over a binary field.
+ * Use: Creates a curve structure for an elliptic curve defined over
+ * a binary field. The @binproj@ variant uses projective
+ * coordinates, which can be a win.
*/
extern ec_curve *ec_bin(field */*f*/, mp */*a*/, mp */*b*/);
+extern ec_curve *ec_binproj(field */*f*/, mp */*a*/, mp */*b*/);
/*----- That's all, folks -------------------------------------------------*/