1 /* $NetBSD: bn_mp_reduce_setup.c,v 1.1.1.2 2014/04/24 12:45:31 pettai Exp $ */
2
3 #include <tommath.h>
4 #ifdef BN_MP_REDUCE_SETUP_C
5 /* LibTomMath, multiple-precision integer library -- Tom St Denis
6 *
7 * LibTomMath is a library that provides multiple-precision
8 * integer arithmetic as well as number theoretic functionality.
9 *
10 * The library was designed directly after the MPI library by
11 * Michael Fromberger but has been written from scratch with
12 * additional optimizations in place.
13 *
14 * The library is free for all purposes without any express
15 * guarantee it works.
16 *
17 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
18 */
19
20 /* pre-calculate the value required for Barrett reduction
21 * For a given modulus "b" it calulates the value required in "a"
22 */
mp_reduce_setup(mp_int * a,mp_int * b)23 int mp_reduce_setup (mp_int * a, mp_int * b)
24 {
25 int res;
26
27 if ((res = mp_2expt (a, b->used * 2 * DIGIT_BIT)) != MP_OKAY) {
28 return res;
29 }
30 return mp_div (a, b, a, NULL);
31 }
32 #endif
33
34 /* Source: /cvs/libtom/libtommath/bn_mp_reduce_setup.c,v */
35 /* Revision: 1.4 */
36 /* Date: 2006/12/28 01:25:13 */
37