Simple (non-projective) curves over prime fields now seem to work.

[u/mdw/catacomb] / ec-prime.c

diff --git a/ec-prime.c b/ec-prime.c
index 4611855..b2bfd52 100644 (file)
--- a/ec-prime.c
+++ b/ec-prime.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: ec-prime.c,v 1.3 2003/05/15 23:25:59 mdw Exp $
+ * $Id: ec-prime.c,v 1.3.4.1 2003/06/10 13:43:53 mdw Exp $
  *
  * Elliptic curves over prime fields
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: ec-prime.c,v $
+ * Revision 1.3.4.1  2003/06/10 13:43:53  mdw
+ * Simple (non-projective) curves over prime fields now seem to work.
+ *
  * Revision 1.3  2003/05/15 23:25:59  mdw
  * Make elliptic curve stuff build.
  *
@@ -54,7 +57,7 @@ typedef struct ecctx {
   mp *a, *b;
 } ecctx;
 
-/*----- Main code ---------------------------------------------------------*/
+/*----- Simple prime curves -----------------------------------------------*/
 
 static const ec_ops ec_primeops;
 
@@ -157,7 +160,7 @@ static void ecdestroy(ec_curve *c)
 
 /* --- @ec_prime@, @ec_primeproj@ --- *
  *
- * Arguments:  @field *f@ = the underyling field for this elliptic curve
+ * Arguments:  @field *f@ = the underlying field for this elliptic curve
  *             @mp *a, *b@ = the coefficients for this curve
  *
  * Returns:    A pointer to the curve.
@@ -172,8 +175,8 @@ extern ec_curve *ec_prime(field *f, mp *a, mp *b)
   ecctx *cc = CREATE(ecctx);
   cc->c.ops = &ec_primeops;
   cc->c.f = f;
-  cc->a = MP_COPY(a);
-  cc->b = MP_COPY(b);
+  cc->a = F_IN(f, MP_NEW, a);
+  cc->b = F_IN(f, MP_NEW, b);
   return (&cc->c);
 }
 
@@ -194,10 +197,12 @@ int main(void)
   ec g = EC_INIT, d = EC_INIT;
   mp *p, *a, *b, *r;
 
+  printf("ec-prime: ");
+  fflush(stdout);
   a = MP(-3);
   b = MP(0x64210519e59c80e70fa7e9ab72243049feb8deecc146b9b1);
   p = MP(6277101735386680763835789423207666416083908700390324961279);
-  r = MP(6277101735386680763835789423176059013767194773182842284081);
+  r = MP(6277101735386680763835789423176059013767194773182842284080);
 
   f = field_prime(p);
   c = ec_prime(f, a, b);
@@ -206,14 +211,25 @@ int main(void)
   g.y = MP(0x07192b95ffc8da78631011ed6b24cdd573f977a11e794811);
 
   ec_mul(c, &d, &g, r);
-  MP_PRINT("d.x", d.x);
-  MP_PRINT("d.y", d.y);
+  if (EC_ATINF(&d)) {
+    fprintf(stderr, "zero too early\n");
+    return (1);
+  }
+  ec_add(c, &d, &d, &g);
+  if (!EC_ATINF(&d)) {
+    fprintf(stderr, "didn't reach zero\n");
+    MP_EPRINT("d.x", d.x);
+    MP_EPRINT("d.y", d.y);
+    return (1);
+  }
 
   ec_destroy(&d);
   ec_destroy(&g);
   ec_destroycurve(c);
   F_DESTROY(f);
-
+  MP_DROP(p); MP_DROP(a); MP_DROP(b); MP_DROP(r);
+  assert(!mparena_count(&mparena_global));
+  printf("ok\n");
   return (0);
 }