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comparison libtommath/bn_mp_reduce_2k_setup.c @ 1739:13d834efc376 fuzz

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merge from main
author Matt Johnston <matt@ucc.asn.au>
date Thu, 15 Oct 2020 19:55:15 +0800
parents 1051e4eea25a
children
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1562:768ebf737aa0 1739:13d834efc376
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 * The library is free for all purposes without any express
13 * guarantee it works.
14 *
15 * Tom St Denis, [email protected], http://libtom.org
16 */
17 5
18 /* determines the setup value */ 6 /* determines the setup value */
19 int mp_reduce_2k_setup(mp_int *a, mp_digit *d) 7 mp_err mp_reduce_2k_setup(const mp_int *a, mp_digit *d)
20 { 8 {
21 int res, p; 9 mp_err err;
22 mp_int tmp; 10 mp_int tmp;
23 11 int p;
24 if ((res = mp_init(&tmp)) != MP_OKAY) { 12
25 return res; 13 if ((err = mp_init(&tmp)) != MP_OKAY) {
14 return err;
26 } 15 }
27 16
28 p = mp_count_bits(a); 17 p = mp_count_bits(a);
29 if ((res = mp_2expt(&tmp, p)) != MP_OKAY) { 18 if ((err = mp_2expt(&tmp, p)) != MP_OKAY) {
30 mp_clear(&tmp); 19 mp_clear(&tmp);
31 return res; 20 return err;
32 } 21 }
33 22
34 if ((res = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) { 23 if ((err = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) {
35 mp_clear(&tmp); 24 mp_clear(&tmp);
36 return res; 25 return err;
37 } 26 }
38 27
39 *d = tmp.dp[0]; 28 *d = tmp.dp[0];
40 mp_clear(&tmp); 29 mp_clear(&tmp);
41 return MP_OKAY; 30 return MP_OKAY;
42 } 31 }
43 #endif 32 #endif
44
45 /* ref: $Format:%D$ */
46 /* git commit: $Format:%H$ */
47 /* commit time: $Format:%ai$ */