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ectab.in: Add previously unacceptable curves from X9.62.
[u/mdw/catacomb]
/
mpmont-exp.c
diff --git
a/mpmont-exp.c
b/mpmont-exp.c
index
c43d02f
..
6959baf
100644
(file)
--- a/
mpmont-exp.c
+++ b/
mpmont-exp.c
@@
-1,13
+1,13
@@
/* -*-c-*-
*
/* -*-c-*-
*
- * $Id
: mpmont-exp.c,v 1.2 2004/04/08 01:36:15 mdw Exp
$
+ * $Id$
*
* Modular exponentiation with Montgomery reduction
*
* (c) 2004 Straylight/Edgeware
*/
*
* Modular exponentiation with Montgomery reduction
*
* (c) 2004 Straylight/Edgeware
*/
-/*----- Licensing notice --------------------------------------------------*
+/*----- Licensing notice --------------------------------------------------*
*
* This file is part of Catacomb.
*
*
* This file is part of Catacomb.
*
@@
-15,12
+15,12
@@
* 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.
* 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.
* 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,
* 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,
@@
-52,17
+52,19
@@
mp *mpmont_expr(mpmont *mm, mp *d, mp *a, mp *e)
MP_COPY(a);
MP_SHRINK(e);
MP_COPY(a);
MP_SHRINK(e);
- if (e->f & MP_NEG) {
- a = mpmont_reduce(mm, a, a);
- a = mp_modinv(a, a, mm->m);
- a = mpmont_mul(mm, a, a, mm->r2);
- }
- if (MP_LEN(e) == 0)
+ if (MP_ZEROP(e))
;
;
- else if (MP_LEN(e) < EXP_THRESH)
- EXP_SIMPLE(x, a, e);
- else
- EXP_WINDOW(x, a, e);
+ else {
+ if (MP_NEGP(e)) {
+ a = mpmont_reduce(mm, a, a);
+ a = mp_modinv(a, a, mm->m);
+ a = mpmont_mul(mm, a, a, mm->r2);
+ }
+ if (MP_LEN(e) < EXP_THRESH)
+ EXP_SIMPLE(x, a, e);
+ else
+ EXP_WINDOW(x, a, e);
+ }
mp_drop(d);
mp_drop(spare);
mp_drop(a);
mp_drop(d);
mp_drop(spare);
mp_drop(a);
@@
-128,7
+130,6
@@
static int texp(dstr *v)
return ok;
}
return ok;
}
-
static test_chunk tests[] = {
{ "exp", texp, { &type_mp, &type_mp, &type_mp, &type_mp, 0 } },
{ 0, 0, { 0 } },
static test_chunk tests[] = {
{ "exp", texp, { &type_mp, &type_mp, &type_mp, &type_mp, 0 } },
{ 0, 0, { 0 } },