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comparison libtommath/bn_mp_shrink.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_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 * 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 /* shrink a bignum */ 6 /* shrink a bignum */
19 int mp_shrink (mp_int * a) 7 mp_err mp_shrink(mp_int *a)
20 { 8 {
21 mp_digit *tmp; 9 mp_digit *tmp;
22 int used = 1; 10 int alloc = MP_MAX(MP_MIN_PREC, a->used);
23 11 if (a->alloc != alloc) {
24 if(a->used > 0) { 12 if ((tmp = (mp_digit *) MP_REALLOC(a->dp,
25 used = a->used; 13 (size_t)a->alloc * sizeof(mp_digit),
26 } 14 (size_t)alloc * sizeof(mp_digit))) == NULL) {
27 15 return MP_MEM;
28 if (a->alloc != used) { 16 }
29 if ((tmp = OPT_CAST(mp_digit) XREALLOC (a->dp, sizeof (mp_digit) * used)) == NULL) { 17 a->dp = tmp;
30 return MP_MEM; 18 a->alloc = alloc;
31 } 19 }
32 a->dp = tmp; 20 return MP_OKAY;
33 a->alloc = used;
34 }
35 return MP_OKAY;
36 } 21 }
37 #endif 22 #endif
38
39 /* ref: $Format:%D$ */
40 /* git commit: $Format:%H$ */
41 /* commit time: $Format:%ai$ */