Mercurial > dropbear

annotate libtommath/bn_mp_set_int.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
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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_SET_INT_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 /* set a 32-bit const */
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16 int mp_set_int(mp_int *a, unsigned long b)
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17 {
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18 int x, res;
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20 mp_zero(a);
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21
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22 /* set four bits at a time */
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23 for (x = 0; x < 8; x++) {
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24 /* shift the number up four bits */
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25 if ((res = mp_mul_2d(a, 4, a)) != MP_OKAY) {
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26 return res;
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27 }
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28
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29 /* OR in the top four bits of the source */
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30 a->dp[0] |= (mp_digit)(b >> 28) & 15uL;
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32 /* shift the source up to the next four bits */
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33 b <<= 4;
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35 /* ensure that digits are not clamped off */
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36 a->used += 1;
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37 }
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38 mp_clamp(a);
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39 return MP_OKAY;
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40 }
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41 #endif
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43 /* ref: HEAD -> master, tag: v1.1.0 */
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44 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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45 /* commit time: 2019-01-28 20:32:32 +0100 */