/* -*-c-*-
*
- * $Id: share.c,v 1.7 2004/04/08 01:36:15 mdw Exp $
+ * $Id$
*
* Shamir's secret sharing
*
* (c) 2000 Straylight/Edgeware
*/
-/*----- Licensing notice --------------------------------------------------*
+/*----- Licensing notice --------------------------------------------------*
*
* This file is part of Catacomb.
*
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
- *
+ *
* Catacomb is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
- *
+ *
* You should have received a copy of the GNU Library General Public
* License along with Catacomb; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
return (d);
}
+/* --- @share_addedp@ --- *
+ *
+ * Arguments: @share *s@ = pointer to sharing context
+ * @unsigned x@ = which share number to check
+ *
+ * Returns: Nonzero if share @x@ has been added already, zero if it
+ * hasn't.
+ */
+
+int share_addedp(share *s, unsigned x)
+{
+ unsigned i;
+
+ for (i = 0; i < s->i; i++) {
+ if (s->v[i].x == x + 1)
+ return (1);
+ }
+ return (0);
+}
+
/* --- @share_add@ --- *
*
* Arguments: @share *s@ = pointer to sharing context
unsigned share_add(share *s, unsigned x, mp *y)
{
+ assert(((void)"Share context is full", s->i < s->t));
+ assert(((void)"Share already present", !share_addedp(s, x)));
+
/* --- If no vector has been allocated, create one --- */
if (!s->v) {
s->v[i].y = 0;
}
- assert(((void)"Share context is full", s->i < s->t));
-
/* --- Store the share in the vector --- */
s->v[s->i].x = x + 1;