Mercurial > dropbear

annotate libtommath/bn_mp_count_bits.c @ 1674:ba6fc7afe1c5

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 06 Apr 2020 23:18:26 +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)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_COUNT_BITS_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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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* returns the number of bits in an int */
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16 int mp_count_bits(const mp_int *a)
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17 {
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18 int r;
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19 mp_digit q;
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21 /* shortcut */
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22 if (a->used == 0) {
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23 return 0;
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parents: 1470
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24 }
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parents: 1470
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26 /* get number of digits and add that */
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27 r = (a->used - 1) * DIGIT_BIT;
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28
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parents: 1470
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29 /* take the last digit and count the bits in it */
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parents: 1470
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30 q = a->dp[a->used - 1];
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31 while (q > (mp_digit)0) {
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32 ++r;
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33 q >>= (mp_digit)1;
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parents: 1470
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34 }
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35 return r;
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36 }
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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 */