/* -*-c-*-
*
- * $Id: share.h,v 1.3 2000/12/06 20:30:10 mdw Exp $
+ * $Id$
*
* Shamir's secret sharing
*
* MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: share.h,v $
- * Revision 1.3 2000/12/06 20:30:10 mdw
- * Change secret sharing interface: present the secret at share
- * construction time.
- *
- * Revision 1.2 2000/06/24 18:29:05 mdw
- * Interface change: allow shares to be extracted from a context on demand,
- * rather than building them all up-front.
- *
- * Revision 1.1 2000/06/17 12:09:38 mdw
- * Shamir's secret sharing system.
- *
- */
-
/*----- Notes on the sharing system ---------------------------------------*
*
* Shamir's secret-sharing system is based on polynomial interpolation modulo
extern mp *share_get(share */*s*/, mp */*d*/, unsigned /*x*/);
+/* --- @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.
+ */
+
+extern int share_addedp(share */*s*/, unsigned /*x*/);
+
/* --- @share_add@ --- *
*
* Arguments: @share *s@ = pointer to sharing context