Mercurial > dropbear

annotate libtommath/bn_mp_reduce_is_2k_l.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 1051e4eea25a
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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_REDUCE_IS_2K_L_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 /* determines if reduce_2k_l can be used */
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16 int mp_reduce_is_2k_l(const mp_int *a)
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17 {
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18 int ix, iy;
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19
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20 if (a->used == 0) {
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21 return MP_NO;
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22 } else if (a->used == 1) {
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23 return MP_YES;
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24 } else if (a->used > 1) {
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25 /* if more than half of the digits are -1 we're sold */
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26 for (iy = ix = 0; ix < a->used; ix++) {
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27 if (a->dp[ix] == MP_MASK) {
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28 ++iy;
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29 }
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30 }
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31 return (iy >= (a->used/2)) ? MP_YES : MP_NO;
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32
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33 }
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34 return MP_NO;
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35 }
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37 #endif
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38
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39 /* ref: HEAD -> master, tag: v1.1.0 */
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40 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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41 /* commit time: 2019-01-28 20:32:32 +0100 */