Mercurial > dropbear

annotate libtommath/bn_mp_read_unsigned_bin.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
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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_READ_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 /* reads a unsigned char array, assumes the msb is stored first [big endian] */
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16 int mp_read_unsigned_bin(mp_int *a, const unsigned char *b, int c)
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17 {
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18 int res;
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19
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20 /* make sure there are at least two digits */
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21 if (a->alloc < 2) {
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22 if ((res = mp_grow(a, 2)) != MP_OKAY) {
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23 return res;
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24 }
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25 }
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26
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27 /* zero the int */
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28 mp_zero(a);
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29
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30 /* read the bytes in */
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31 while (c-- > 0) {
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32 if ((res = mp_mul_2d(a, 8, a)) != MP_OKAY) {
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33 return res;
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34 }
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36 #ifndef MP_8BIT
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37 a->dp[0] |= *b++;
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38 a->used += 1;
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39 #else
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40 a->dp[0] = (*b & MP_MASK);
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41 a->dp[1] |= ((*b++ >> 7) & 1u);
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42 a->used += 2;
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43 #endif
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44 }
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45 mp_clamp(a);
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46 return MP_OKAY;
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47 }
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48 #endif
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49
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50 /* ref: HEAD -> master, tag: v1.1.0 */
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51 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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52 /* commit time: 2019-01-28 20:32:32 +0100 */