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annotate libtommath/bn_mp_get_int.c @ 1663:c795520269f9

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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>
date Sat, 14 Mar 2020 14:37:35 +0000
parents f52919ffd3b1
children
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_GET_INT_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 /* get the lower 32-bits of an mp_int */
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16 unsigned long mp_get_int(const mp_int *a)
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17 {
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18 int i;
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19 mp_min_u32 res;
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21 if (a->used == 0) {
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22 return 0;
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23 }
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25 /* get number of digits of the lsb we have to read */
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26 i = MIN(a->used, ((((int)sizeof(unsigned long) * CHAR_BIT) + DIGIT_BIT - 1) / DIGIT_BIT)) - 1;
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28 /* get most significant digit of result */
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29 res = DIGIT(a, i);
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31 while (--i >= 0) {
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32 res = (res << DIGIT_BIT) | DIGIT(a, i);
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33 }
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34
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35 /* force result to 32-bits always so it is consistent on non 32-bit platforms */
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36 return res & 0xFFFFFFFFUL;
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37 }
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38 #endif
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40 /* ref: HEAD -> master, tag: v1.1.0 */
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41 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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42 /* commit time: 2019-01-28 20:32:32 +0100 */