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comparison libtommath/bn_mp_reduce_2k_setup_l.c @ 399:a707e6148060

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merge of '5fdf69ca60d1683cdd9f4c2595134bed26394834' and '6b61c50f4cf888bea302ac8fcf5dbb573b443251'
author Matt Johnston <matt@ucc.asn.au>
date Sat, 03 Feb 2007 08:20:34 +0000
parents 5ff8218bcee9
children 60fc6476e044
comparison
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394:17d097fc111c 399:a707e6148060
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, [email protected], http://math.libtomcrypt.com
16 */
17
18 /* determines the setup value */
19 int 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
36 ERR:
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: 1.3 $ */
44 /* $Date: 2006/03/31 14:18:44 $ */