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annotate libtommath/bn_mp_get_int.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
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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_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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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 */