Mercurial > dropbear
annotate libtommath/bn_mp_grow.c @ 1663:c795520269f9
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> |
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date | Sat, 14 Mar 2020 14:37:35 +0000 |
parents | f52919ffd3b1 |
children | 1051e4eea25a |
rev | line source |
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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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20 |
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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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25 |
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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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37 |
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38 /* reallocation succeeded so set a->dp */ |
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39 a->dp = tmp; |
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40 |
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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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51 |
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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 */ |