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annotate libtommath/bn_mp_to_unsigned_bin.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
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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_TO_UNSIGNED_BIN_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 /* store in unsigned [big endian] format */
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16 int mp_to_unsigned_bin(const mp_int *a, unsigned char *b)
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17 {
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18 int x, res;
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19 mp_int t;
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20
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21 if ((res = mp_init_copy(&t, a)) != MP_OKAY) {
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22 return res;
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23 }
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24
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25 x = 0;
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26 while (mp_iszero(&t) == MP_NO) {
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27 #ifndef MP_8BIT
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28 b[x++] = (unsigned char)(t.dp[0] & 255u);
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29 #else
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30 b[x++] = (unsigned char)(t.dp[0] | ((t.dp[1] & 1u) << 7));
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31 #endif
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32 if ((res = mp_div_2d(&t, 8, &t, NULL)) != MP_OKAY) {
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33 mp_clear(&t);
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34 return res;
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35 }
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36 }
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37 bn_reverse(b, x);
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38 mp_clear(&t);
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39 return MP_OKAY;
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40 }
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41 #endif
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42
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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 */