comparison libtommath/bn_mp_reduce_setup.c @ 1692:1051e4eea25a

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
comparison
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1691:2d3745d58843 1692:1051e4eea25a
1 #include "tommath_private.h" 1 #include "tommath_private.h"
2 #ifdef BN_MP_REDUCE_SETUP_C 2 #ifdef BN_MP_REDUCE_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 /* pre-calculate the value required for Barrett reduction 6 /* pre-calculate the value required for Barrett reduction
16 * For a given modulus "b" it calulates the value required in "a" 7 * For a given modulus "b" it calulates the value required in "a"
17 */ 8 */
18 int mp_reduce_setup(mp_int *a, const mp_int *b) 9 mp_err mp_reduce_setup(mp_int *a, const mp_int *b)
19 { 10 {
20 int res; 11 mp_err err;
21 12 if ((err = mp_2expt(a, b->used * 2 * MP_DIGIT_BIT)) != MP_OKAY) {
22 if ((res = mp_2expt(a, b->used * 2 * DIGIT_BIT)) != MP_OKAY) { 13 return err;
23 return res;
24 } 14 }
25 return mp_div(a, b, a, NULL); 15 return mp_div(a, b, a, NULL);
26 } 16 }
27 #endif 17 #endif
28
29 /* ref: HEAD -> master, tag: v1.1.0 */
30 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
31 /* commit time: 2019-01-28 20:32:32 +0100 */