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comparison libtommath/bn_mp_from_sbin.c @ 1692:1051e4eea25a

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Update LibTomMath to 1.2.0 (#84) * update C files * update other files * update headers * update makefiles * remove mp_set/get_double() * use ltm 1.2.0 API * update ltm_desc * use bundled tommath if system-tommath is too old * XMALLOC etc. were changed to MP_MALLOC etc.
author Steffen Jaeckel <s@jaeckel.eu>
date Tue, 26 May 2020 17:36:47 +0200
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1691:2d3745d58843 1692:1051e4eea25a
1 #include "tommath_private.h"
2 #ifdef BN_MP_FROM_SBIN_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
4 /* SPDX-License-Identifier: Unlicense */
5
6 /* read signed bin, big endian, first byte is 0==positive or 1==negative */
7 mp_err mp_from_sbin(mp_int *a, const unsigned char *buf, size_t size)
8 {
9 mp_err err;
10
11 /* read magnitude */
12 if ((err = mp_from_ubin(a, buf + 1, size - 1u)) != MP_OKAY) {
13 return err;
14 }
15
16 /* first byte is 0 for positive, non-zero for negative */
17 if (buf[0] == (unsigned char)0) {
18 a->sign = MP_ZPOS;
19 } else {
20 a->sign = MP_NEG;
21 }
22
23 return MP_OKAY;
24 }
25 #endif