Mercurial > dropbear
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> |
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date | Tue, 26 May 2020 17:36:47 +0200 |
parents | f52919ffd3b1 |
children |
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1691:2d3745d58843 | 1692:1051e4eea25a |
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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 */ |