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[u/mdw/catacomb]
/
mpmont-exp.c
diff --git
a/mpmont-exp.c
b/mpmont-exp.c
index
c43d02f
..
0caf118
100644
(file)
--- a/
mpmont-exp.c
+++ b/
mpmont-exp.c
@@
-1,6
+1,6
@@
/* -*-c-*-
*
/* -*-c-*-
*
- * $Id
: mpmont-exp.c,v 1.2 2004/04/08 01:36:15 mdw Exp
$
+ * $Id$
*
* Modular exponentiation with Montgomery reduction
*
*
* Modular exponentiation with Montgomery reduction
*
@@
-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);