Mercurial > dropbear

annotate libtommath/bn_mp_dr_is_modulus.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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_DR_IS_MODULUS_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 a number is a valid DR modulus */
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16 int mp_dr_is_modulus(const mp_int *a)
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17 {
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18 int ix;
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20 /* must be at least two digits */
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21 if (a->used < 2) {
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22 return 0;
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23 }
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25 /* must be of the form b**k - a [a <= b] so all
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26 * but the first digit must be equal to -1 (mod b).
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27 */
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28 for (ix = 1; ix < a->used; ix++) {
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29 if (a->dp[ix] != MP_MASK) {
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30 return 0;
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31 }
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32 }
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33 return 1;
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34 }
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36 #endif
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37
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38 /* ref: HEAD -> master, tag: v1.1.0 */
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39 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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40 /* commit time: 2019-01-28 20:32:32 +0100 */