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annotate libtommath/bn_mp_grow.c @ 1629:258b57b208ae

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Fix for issue successfull login of disabled user (#78) This commit introduces fix for scenario: 1. Root login disabled on dropbear 2. PAM authentication model enabled While login as root user, after prompt for password user is being notified about login failrue, but after second attempt of prompt for password within same session, login becames succesfull. Signed-off-by: Pawel Rapkiewicz <[email protected]>
author vincentto13 <33652988+vincentto13@users.noreply.github.com>
date Wed, 20 Mar 2019 15:03:40 +0100
parents 8bba51a55704
children f52919ffd3b1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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60fc6476e044 Update to libtommath v1.0
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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 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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60fc6476e044 Update to libtommath v1.0
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15 * Tom St Denis, [email protected], http://libtom.org
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16 */
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17
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18 /* grow as required */
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19 int mp_grow (mp_int * a, int size)
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20 {
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21 int i;
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22 mp_digit *tmp;
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23
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24 /* if the alloc size is smaller alloc more ram */
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25 if (a->alloc < size) {
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26 /* ensure there are always at least MP_PREC digits extra on top */
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27 size += (MP_PREC * 2) - (size % MP_PREC);
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28
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29 /* reallocate the array a->dp
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30 *
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31 * We store the return in a temporary variable
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32 * in case the operation failed we don't want
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33 * to overwrite the dp member of a.
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34 */
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35 tmp = OPT_CAST(mp_digit) XREALLOC (a->dp, sizeof (mp_digit) * size);
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36 if (tmp == NULL) {
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37 /* reallocation failed but "a" is still valid [can be freed] */
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38 return MP_MEM;
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39 }
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40
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41 /* reallocation succeeded so set a->dp */
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42 a->dp = tmp;
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43
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44 /* zero excess digits */
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45 i = a->alloc;
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46 a->alloc = size;
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47 for (; i < a->alloc; i++) {
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48 a->dp[i] = 0;
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49 }
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50 }
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51 return MP_OKAY;
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52 }
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53 #endif
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54
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55 /* ref: $Format:%D$ */
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56 /* git commit: $Format:%H$ */
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57 /* commit time: $Format:%ai$ */