more fix on ecc

2014-01-22 10:02:08 +09:00
parent 8d05addc87
commit 486f20bfd4
3 changed files with 15 additions and 30 deletions
--- a/src/jpc.c
+++ b/src/jpc.c
@@ -37,8 +37,12 @@ void
 jpc_double (jpc *X, const jpc *A)
 {
  bn256 a[1], b[1], c[1], tmp0[1];
-  bn256 *d = X->x;
+  bn256 *d;

+  if (bn256_is_zero (A->z))		/* A is infinite */
+    return;
+
+  d = X->x;
  modp256_sqr (a, A->y);
  memcpy (b, a, sizeof (bn256));
  modp256_mul (a, a, A->x);