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annotate libtommath/bn_mp_reduce_is_2k_l.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 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 */