23 lines
606 B
C
23 lines
606 B
C
#include "tommath_private.h"
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#ifdef BN_MP_TO_SBIN_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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/* store in signed [big endian] format */
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mp_err mp_to_sbin(const mp_int *a, unsigned char *buf, size_t maxlen, size_t *written)
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{
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mp_err err;
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if (maxlen == 0u) {
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return MP_BUF;
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}
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if ((err = mp_to_ubin(a, buf + 1, maxlen - 1u, written)) != MP_OKAY) {
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return err;
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}
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if (written != NULL) {
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(*written)++;
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}
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buf[0] = (a->sign == MP_ZPOS) ? (unsigned char)0 : (unsigned char)1;
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return MP_OKAY;
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}
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#endif
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