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annotate libtommath/bn_mp_grow.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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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_GROW_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 /* grow as required */
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16 int mp_grow(mp_int *a, int size)
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17 {
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18 int i;
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19 mp_digit *tmp;
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21 /* if the alloc size is smaller alloc more ram */
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22 if (a->alloc < size) {
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23 /* ensure there are always at least MP_PREC digits extra on top */
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24 size += (MP_PREC * 2) - (size % MP_PREC);
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26 /* reallocate the array a->dp
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27 *
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28 * We store the return in a temporary variable
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29 * in case the operation failed we don't want
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30 * to overwrite the dp member of a.
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31 */
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32 tmp = OPT_CAST(mp_digit) XREALLOC(a->dp, sizeof(mp_digit) * (size_t)size);
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33 if (tmp == NULL) {
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34 /* reallocation failed but "a" is still valid [can be freed] */
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35 return MP_MEM;
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36 }
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38 /* reallocation succeeded so set a->dp */
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39 a->dp = tmp;
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41 /* zero excess digits */
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42 i = a->alloc;
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43 a->alloc = size;
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44 for (; i < a->alloc; i++) {
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45 a->dp[i] = 0;
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46 }
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47 }
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48 return MP_OKAY;
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49 }
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50 #endif
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52 /* ref: HEAD -> master, tag: v1.1.0 */
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53 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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54 /* commit time: 2019-01-28 20:32:32 +0100 */