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comparison libtommath/bn_mp_shrink.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_SHRINK_C 2 #ifdef BN_MP_SHRINK_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 /* shrink a bignum */ 6 /* shrink a bignum */
16 int mp_shrink(mp_int *a) 7 mp_err mp_shrink(mp_int *a)
17 { 8 {
18 mp_digit *tmp; 9 mp_digit *tmp;
19 int used = 1; 10 int alloc = MP_MAX(MP_MIN_PREC, a->used);
20 11 if (a->alloc != alloc) {
21 if (a->used > 0) { 12 if ((tmp = (mp_digit *) MP_REALLOC(a->dp,
22 used = a->used; 13 (size_t)a->alloc * sizeof(mp_digit),
23 } 14 (size_t)alloc * sizeof(mp_digit))) == NULL) {
24
25 if (a->alloc != used) {
26 if ((tmp = OPT_CAST(mp_digit) XREALLOC(a->dp, sizeof(mp_digit) * (size_t)used)) == NULL) {
27 return MP_MEM; 15 return MP_MEM;
28 } 16 }
29 a->dp = tmp; 17 a->dp = tmp;
30 a->alloc = used; 18 a->alloc = alloc;
31 } 19 }
32 return MP_OKAY; 20 return MP_OKAY;
33 } 21 }
34 #endif 22 #endif
35
36 /* ref: HEAD -> master, tag: v1.1.0 */
37 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
38 /* commit time: 2019-01-28 20:32:32 +0100 */