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annotate libtommath/bn_mp_reduce_is_2k.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_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 mp_reduce_2k can be used */
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16 int mp_reduce_is_2k(const mp_int *a)
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17 {
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18 int ix, iy, iw;
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19 mp_digit iz;
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20
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21 if (a->used == 0) {
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22 return MP_NO;
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23 } else if (a->used == 1) {
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24 return MP_YES;
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25 } else if (a->used > 1) {
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26 iy = mp_count_bits(a);
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27 iz = 1;
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28 iw = 1;
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29
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30 /* Test every bit from the second digit up, must be 1 */
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31 for (ix = DIGIT_BIT; ix < iy; ix++) {
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32 if ((a->dp[iw] & iz) == 0u) {
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33 return MP_NO;
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34 }
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35 iz <<= 1;
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36 if (iz > (mp_digit)MP_MASK) {
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37 ++iw;
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38 iz = 1;
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39 }
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40 }
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41 }
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42 return MP_YES;
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43 }
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44
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45 #endif
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46
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47 /* ref: HEAD -> master, tag: v1.1.0 */
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48 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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49 /* commit time: 2019-01-28 20:32:32 +0100 */