kc3-lang/libtommath/bn_mp_to_sbin.c

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• Hash : fe2f91a1
  Author :
  Date : 2019-10-09T20:22:11
  

  to_sbin/to_ubin/pack: don't write anything in case of buffer overflow

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• bn_mp_to_sbin.c

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

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