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annotate libtommath/bn_mp_init_size.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
parents f52919ffd3b1
children 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_INIT_SIZE_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* init an mp_init for a given size */
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16 int mp_init_size(mp_int *a, int size)
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17 {
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18 int x;
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19
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20 /* pad size so there are always extra digits */
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21 size += (MP_PREC * 2) - (size % MP_PREC);
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23 /* alloc mem */
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24 a->dp = OPT_CAST(mp_digit) XMALLOC(sizeof(mp_digit) * (size_t)size);
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25 if (a->dp == NULL) {
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26 return MP_MEM;
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27 }
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28
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29 /* set the members */
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30 a->used = 0;
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31 a->alloc = size;
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32 a->sign = MP_ZPOS;
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33
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34 /* zero the digits */
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35 for (x = 0; x < size; x++) {
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36 a->dp[x] = 0;
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37 }
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38
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39 return MP_OKAY;
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40 }
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41 #endif
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42
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43 /* ref: HEAD -> master, tag: v1.1.0 */
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44 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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45 /* commit time: 2019-01-28 20:32:32 +0100 */