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comparison libtommath/bn_mp_reduce_2k_setup.c @ 1692:1051e4eea25a

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Update LibTomMath to 1.2.0 (#84) * update C files * update other files * update headers * update makefiles * remove mp_set/get_double() * use ltm 1.2.0 API * update ltm_desc * use bundled tommath if system-tommath is too old * XMALLOC etc. were changed to MP_MALLOC etc.
author Steffen Jaeckel <s@jaeckel.eu>
date Tue, 26 May 2020 17:36:47 +0200
parents f52919ffd3b1
children
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1691:2d3745d58843 1692:1051e4eea25a
1 #include "tommath_private.h" 1 #include "tommath_private.h"
2 #ifdef BN_MP_REDUCE_2K_SETUP_C 2 #ifdef BN_MP_REDUCE_2K_SETUP_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
4 * 4 /* SPDX-License-Identifier: Unlicense */
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 * SPDX-License-Identifier: Unlicense
13 */
14 5
15 /* determines the setup value */ 6 /* determines the setup value */
16 int mp_reduce_2k_setup(const mp_int *a, mp_digit *d) 7 mp_err mp_reduce_2k_setup(const mp_int *a, mp_digit *d)
17 { 8 {
18 int res, p; 9 mp_err err;
19 mp_int tmp; 10 mp_int tmp;
11 int p;
20 12
21 if ((res = mp_init(&tmp)) != MP_OKAY) { 13 if ((err = mp_init(&tmp)) != MP_OKAY) {
22 return res; 14 return err;
23 } 15 }
24 16
25 p = mp_count_bits(a); 17 p = mp_count_bits(a);
26 if ((res = mp_2expt(&tmp, p)) != MP_OKAY) { 18 if ((err = mp_2expt(&tmp, p)) != MP_OKAY) {
27 mp_clear(&tmp); 19 mp_clear(&tmp);
28 return res; 20 return err;
29 } 21 }
30 22
31 if ((res = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) { 23 if ((err = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) {
32 mp_clear(&tmp); 24 mp_clear(&tmp);
33 return res; 25 return err;
34 } 26 }
35 27
36 *d = tmp.dp[0]; 28 *d = tmp.dp[0];
37 mp_clear(&tmp); 29 mp_clear(&tmp);
38 return MP_OKAY; 30 return MP_OKAY;
39 } 31 }
40 #endif 32 #endif
41
42 /* ref: HEAD -> master, tag: v1.1.0 */
43 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
44 /* commit time: 2019-01-28 20:32:32 +0100 */