X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/898a4e2555438ff8adb08b4d82690d08715e1048..b817bfc642225b8c3c0b6a7e42d1fb949b61a606:/share.c

diff --git a/share.c b/share.c
index d0fd0f5..23d730c 100644
--- a/share.c
+++ b/share.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: share.c,v 1.6 2001/02/03 16:05:41 mdw Exp $
+ * $Id: share.c,v 1.7 2004/04/08 01:36:15 mdw Exp $
  *
  * Shamir's secret sharing
  *
@@ -27,33 +27,6 @@
  * MA 02111-1307, USA.
  */
 
-/*----- Revision history --------------------------------------------------* 
- *
- * $Log: share.c,v $
- * Revision 1.6  2001/02/03 16:05:41  mdw
- * Now @mp_drop@ checks its argument is non-NULL before attempting to free
- * it.  Note that the macro version @MP_DROP@ doesn't do this.
- *
- * Revision 1.5  2000/12/06 20:30:10  mdw
- * Change secret sharing interface: present the secret at share
- * construction time.
- *
- * Revision 1.4  2000/10/08 12:16:17  mdw
- * Use @MP_EQ@ instead of @MP_CMP@.
- *
- * Revision 1.3  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 1.2  2000/06/18 23:05:19  mdw
- * Minor performance tweak: use Barrett reduction rather than Montgomery.
- * Fast secret sharing isn't done here, though: see `gfshare' instead.
- *
- * Revision 1.1  2000/06/17 12:09:38  mdw
- * Shamir's secret sharing system.
- *
- */
-
 /*----- Header files ------------------------------------------------------*/
 
 #include <stdio.h>
@@ -280,7 +253,7 @@ mp *share_combine(share *s)
 	m = mp_sub(m, &ii, &jj);
 	m = mp_sub(m, s->p, m);
       }
-      mp_gcd(0, 0, &m, s->p, m);
+      m = mp_modinv(m, m, s->p);
       c = mp_mul(c, c, &jj);
       c = mpbarrett_reduce(&mb, c, c);
       c = mp_mul(c, c, m);