Mercurial > dropbear

annotate libtommath/bn_mp_reduce_is_2k.c @ 1793:f90e681b8b8c

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merge
author Matt Johnston <matt@ucc.asn.au>
date Fri, 29 Jan 2021 21:59:12 +0800
parents 1051e4eea25a
children
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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_REDUCE_IS_2K_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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6 /* determines if mp_reduce_2k can be used */
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7 mp_bool mp_reduce_is_2k(const mp_int *a)
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8 {
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9 int ix, iy, iw;
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10 mp_digit iz;
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11
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12 if (a->used == 0) {
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13 return MP_NO;
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14 } else if (a->used == 1) {
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15 return MP_YES;
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16 } else if (a->used > 1) {
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17 iy = mp_count_bits(a);
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18 iz = 1;
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19 iw = 1;
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20
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21 /* Test every bit from the second digit up, must be 1 */
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22 for (ix = MP_DIGIT_BIT; ix < iy; ix++) {
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23 if ((a->dp[iw] & iz) == 0u) {
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24 return MP_NO;
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25 }
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26 iz <<= 1;
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27 if (iz > MP_DIGIT_MAX) {
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28 ++iw;
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29 iz = 1;
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30 }
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31 }
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32 return MP_YES;
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33 } else {
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34 return MP_YES;
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35 }
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36 }
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38 #endif