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annotate libtommath/bn_mp_to_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_TO_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 /* store in signed [big endian] format */
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7 mp_err mp_to_sbin(const mp_int *a, unsigned char *buf, size_t maxlen, size_t *written)
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8 {
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9 mp_err err;
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10 if (maxlen == 0u) {
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11 return MP_BUF;
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12 }
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13 if ((err = mp_to_ubin(a, buf + 1, maxlen - 1u, written)) != MP_OKAY) {
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14 return err;
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15 }
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16 if (written != NULL) {
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17 (*written)++;
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18 }
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19 buf[0] = (a->sign == MP_ZPOS) ? (unsigned char)0 : (unsigned char)1;
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20 return MP_OKAY;
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21 }
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22 #endif