X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/b817bfc642225b8c3c0b6a7e42d1fb949b61a606..02dfbd5b7af7816959dbd39c1fe628451204e35f:/rabin.c

diff --git a/rabin.c b/rabin.c
index 729ecce..4c08f87 100644
--- a/rabin.c
+++ b/rabin.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: rabin.c,v 1.9 2004/04/08 01:36:15 mdw Exp $
+ * $Id$
  *
  * Miller-Rabin primality test
  *
@@ -42,19 +42,23 @@
  * Arguments:	@rabin *r@ = pointer to Rabin-Miller context
  *		@mp *m@ = pointer to number to test
  *
- * Returns:	---
+ * Returns:	Zero on success, nonzero on failure.
  *
  * Use:		Precomputes some useful values for performing the
  *		Miller-Rabin probabilistic primality test.
  */
 
-void rabin_create(rabin *r, mp *m)
+int rabin_create(rabin *r, mp *m)
 {
   mp *m1 = mp_sub(MP_NEW, m, MP_ONE);
-  mpmont_create(&r->mm, m);
+  if (mpmont_create(&r->mm, m)) {
+    MP_DROP(m1);
+    return (-1);
+  }
   r->r = mp_odd(MP_NEW, m1, &r->s);
   r->m1 = mp_sub(MP_NEW, m, r->mm.r);
   mp_drop(m1);
+  return (0);
 }
 
 /* --- @rabin_destroy@ --- *