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annotate 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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1692
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_FROM_SBIN_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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5
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6 /* read signed bin, big endian, first byte is 0==positive or 1==negative */
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7 mp_err mp_from_sbin(mp_int *a, const unsigned char *buf, size_t size)
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8 {
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9 mp_err err;
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10
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11 /* read magnitude */
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12 if ((err = mp_from_ubin(a, buf + 1, size - 1u)) != MP_OKAY) {
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13 return err;
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14 }
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15
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16 /* first byte is 0 for positive, non-zero for negative */
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17 if (buf[0] == (unsigned char)0) {
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18 a->sign = MP_ZPOS;
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19 } else {
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20 a->sign = MP_NEG;
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21 }
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22
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23 return MP_OKAY;
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24 }
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25 #endif