Mercurial > dropbear

annotate libtommath/bn_mp_grow.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
parents f52919ffd3b1
children 1051e4eea25a
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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 */