Mercurial > dropbear

annotate libtommath/bn_mp_reduce_2k_setup.c @ 1689:d2d3b5ba6c64

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update travis to Ubuntu focal to provide chacha20
author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 May 2020 23:13:48 +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_REDUCE_2K_SETUP_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>
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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 the setup value */
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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16 int mp_reduce_2k_setup(const mp_int *a, mp_digit *d)
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17 {
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18 int res, p;
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19 mp_int tmp;
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20
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21 if ((res = mp_init(&tmp)) != MP_OKAY) {
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22 return res;
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23 }
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24
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25 p = mp_count_bits(a);
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26 if ((res = mp_2expt(&tmp, p)) != MP_OKAY) {
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27 mp_clear(&tmp);
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28 return res;
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29 }
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30
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31 if ((res = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) {
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32 mp_clear(&tmp);
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33 return res;
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34 }
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35
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36 *d = tmp.dp[0];
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37 mp_clear(&tmp);
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38 return MP_OKAY;
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39 }
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40 #endif
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41
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42 /* ref: HEAD -> master, tag: v1.1.0 */
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43 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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44 /* commit time: 2019-01-28 20:32:32 +0100 */