Mercurial > dropbear

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
merge from main
author Matt Johnston <matt@ucc.asn.au>
date Thu, 15 Oct 2020 19:55:15 +0800
parents 1051e4eea25a
children
comparison
equal deleted inserted replaced
1562:768ebf737aa0 1739:13d834efc376
1 #include <tommath_private.h> 1 #include "tommath_private.h"
2 #ifdef BN_MP_INIT_SIZE_C 2 #ifdef BN_MP_INIT_SIZE_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 /* init an mp_init for a given size */ 6 /* init an mp_init for a given size */
19 int mp_init_size (mp_int * a, int size) 7 mp_err mp_init_size(mp_int *a, int size)
20 { 8 {
21 int x; 9 size = MP_MAX(MP_MIN_PREC, size);
22 10
23 /* pad size so there are always extra digits */ 11 /* alloc mem */
24 size += (MP_PREC * 2) - (size % MP_PREC); 12 a->dp = (mp_digit *) MP_CALLOC((size_t)size, sizeof(mp_digit));
25 13 if (a->dp == NULL) {
26 /* alloc mem */ 14 return MP_MEM;
27 a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * size); 15 }
28 if (a->dp == NULL) {
29 return MP_MEM;
30 }
31 16
32 /* set the members */ 17 /* set the members */
33 a->used = 0; 18 a->used = 0;
34 a->alloc = size; 19 a->alloc = size;
35 a->sign = MP_ZPOS; 20 a->sign = MP_ZPOS;
36 21
37 /* zero the digits */ 22 return MP_OKAY;
38 for (x = 0; x < size; x++) {
39 a->dp[x] = 0;
40 }
41
42 return MP_OKAY;
43 } 23 }
44 #endif 24 #endif
45
46 /* ref: $Format:%D$ */
47 /* git commit: $Format:%H$ */
48 /* commit time: $Format:%ai$ */