X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/b0b682aa5f6174deb5bde83701b191556986fe05..f0c52873e4c1e3a16bb2d5a086df2526f698e4ac:/dsa-verify.c

diff --git a/dsa-verify.c b/dsa-verify.c
index a39c11b..90895b4 100644
--- a/dsa-verify.c
+++ b/dsa-verify.c
@@ -1,13 +1,13 @@
 /* -*-c-*-
  *
- * $Id: dsa-verify.c,v 1.6 2001/06/16 12:56:38 mdw Exp $
+ * $Id: dsa-verify.c,v 1.7 2004/04/08 01:36:15 mdw Exp $
  *
  * DSA signature verification
  *
  * (c) 1999 Straylight/Edgeware
  */
 
-/*----- Licensing notice --------------------------------------------------* 
+/*----- Licensing notice --------------------------------------------------*
  *
  * This file is part of Catacomb.
  *
@@ -15,41 +15,18 @@
  * 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,
  * MA 02111-1307, USA.
  */
 
-/*----- Revision history --------------------------------------------------* 
- *
- * $Log: dsa-verify.c,v $
- * Revision 1.6  2001/06/16 12:56:38  mdw
- * Fixes for interface change to @mpmont_expr@ and @mpmont_mexpr@.
- *
- * Revision 1.5  2000/10/08 12:13:17  mdw
- * Use @MP_EQ@ instead of @MP_CMP@.
- *
- * Revision 1.4  2000/06/17 10:53:35  mdw
- * Typesetting fixes.
- *
- * Revision 1.3  1999/12/10 23:18:38  mdw
- * Change interface for suggested destinations.
- *
- * Revision 1.2  1999/11/23 00:20:04  mdw
- * Remove stray debugging code.
- *
- * Revision 1.1  1999/11/19 19:28:00  mdw
- * Implementation of the Digital Signature Algorithm.
- *
- */
-
 /*----- Header files ------------------------------------------------------*/
 
 #include "dsa.h"
@@ -92,8 +69,7 @@ int dsa_vrfy(const dsa_param *dp, mp *y, mp *m, mp *r, mp *s)
   /* --- Compute %$w = s^{-1} \bmod q$% --- */
 
   {
-    mp *z = MP_NEW;
-    mp_gcd(0, 0, &z, dp->q, s);
+    mp *z = mp_modinv(MP_NEW, s, dp->q);
     w = mpmont_mul(&qm, MP_NEW, z, qm.r2);
     mp_drop(z);
   }
@@ -143,7 +119,7 @@ int dsa_verify(const dsa_param *dp, mp *y,
 	       const void *r, size_t rsz,
 	       const void *s, size_t ssz)
 {
-  mp *mm = mp_loadb(MP_NEW, m, msz);
+  mp *mm = dsa_h2n(MP_NEW, dp->q, m, msz);
   mp *rm = mp_loadb(MP_NEW, r, rsz);
   mp *sm = mp_loadb(MP_NEW, s, ssz);
   int ok = dsa_vrfy(dp, y, mm, rm, sm);