X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/dbfee00a86609283c4633df870692be3db9bc5e4..bc985cefafea2e1b02095a2ff2a9982c4c647d17:/calc/ecp.cal

diff --git a/calc/ecp.cal b/calc/ecp.cal
index 82600f5..3834359 100644
--- a/calc/ecp.cal
+++ b/calc/ecp.cal
@@ -1,6 +1,6 @@
 /* -*-apcalc-*-
  *
- * $Id: ecp.cal,v 1.1.4.1 2003/06/10 13:43:53 mdw Exp $
+ * $Id: ecp.cal,v 1.3 2004/03/23 15:19:32 mdw Exp $
  *
  * Testbed for elliptic curve arithmetic over prime fields
  *
@@ -30,6 +30,15 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: ecp.cal,v $
+ * Revision 1.3  2004/03/23 15:19:32  mdw
+ * Test elliptic curves more thoroughly.
+ *
+ * Revision 1.2  2004/03/21 22:52:06  mdw
+ * Merge and close elliptic curve branch.
+ *
+ * Revision 1.1.4.2  2004/03/20 00:13:31  mdw
+ * Projective coordinates for prime curves
+ *
  * Revision 1.1.4.1  2003/06/10 13:43:53  mdw
  * Simple (non-projective) curves over prime fields now seem to work.
  *
@@ -103,6 +112,8 @@ define ecp_pt_dbl(a)
 {
   local e, alpha;
   local obj ecp_pt d;
+  if (istype(a, 1))
+    return (0);
   e = a.e;
   alpha = (3 * a.x^2 + e.a) * minv(2 * a.y, e.p) % e.p;
   d.x = (alpha^2 - 2 * a.x) % e.p;