1#include <tommath.h>
2#ifdef BN_MP_REDUCE_2K_SETUP_L_C
3/* LibTomMath, multiple-precision integer library -- Tom St Denis
4 *
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
7 *
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
11 *
12 * The library is free for all purposes without any express
13 * guarantee it works.
14 *
15 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
16 */
17
18/* determines the setup value */
19int mp_reduce_2k_setup_l(mp_int *a, mp_int *d)
20{
21   int    res;
22   mp_int tmp;
23
24   if ((res = mp_init(&tmp)) != MP_OKAY) {
25      return res;
26   }
27
28   if ((res = mp_2expt(&tmp, mp_count_bits(a))) != MP_OKAY) {
29      goto ERR;
30   }
31
32   if ((res = s_mp_sub(&tmp, a, d)) != MP_OKAY) {
33      goto ERR;
34   }
35
36ERR:
37   mp_clear(&tmp);
38   return res;
39}
40#endif
41
42/* $Source: /cvs/libtom/libtommath/bn_mp_reduce_2k_setup_l.c,v $ */
43/* $Revision: 1.4 $ */
44/* $Date: 2006/12/28 01:25:13 $ */
45