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annotate libtommath/bn_mp_init_size.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
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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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 */