Mercurial > dropbear

annotate libtommath/bn_mp_read_signed_bin.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
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>
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_READ_SIGNED_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 /* read signed bin, big endian, first byte is 0==positive or 1==negative */
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16 int mp_read_signed_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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20 /* read magnitude */
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21 if ((res = mp_read_unsigned_bin(a, b + 1, c - 1)) != MP_OKAY) {
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22 return res;
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23 }
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25 /* first byte is 0 for positive, non-zero for negative */
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26 if (b[0] == (unsigned char)0) {
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27 a->sign = MP_ZPOS;
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28 } else {
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29 a->sign = MP_NEG;
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30 }
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32 return MP_OKAY;
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33 }
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34 #endif
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35
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36 /* ref: HEAD -> master, tag: v1.1.0 */
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37 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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38 /* commit time: 2019-01-28 20:32:32 +0100 */