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annotate libtommath/bn_mp_read_signed_bin.c @ 1673:e0871128e61f

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CBC mode cleanup (#95) * Fix CBC mode can't be fully disabled * Fix CBC mode can't be the only mode
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 20:55:13 +0500
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_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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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 */