bn_mp_fwrite.c

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Author : Daniel Mendler
Date : 2019-05-11 10:22:20
Hash : 61d9e528
Message : hardening: add MP_ZERO_BUFFER, MP_ZERO_DIGITS * (!) Always zero buffer before freeing if MP_NO_ZERO_ON_FREE is not defined * Add MP_NO_ZERO_ON_FREE to disable hardening * Add MP_ZERO_BUFFER, MP_ZERO_DIGITS, MP_FREE_BUFFFER, MP_FREE_DIGITS * Never use MP_FREE directly, use MP_FREE_DIGITS or MP_FREE_BUFFER * Add MP_USE_MEMSET to use memset instead of loop * Disable astyle backups which are annonying in the times of git

bn_mp_fwrite.c

#include "tommath_private.h"
#ifdef BN_MP_FWRITE_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */

#ifndef MP_NO_FILE
int mp_fwrite(const mp_int *a, int radix, FILE *stream)
{
   char *buf;
   int err, len, x;

   if ((err = mp_radix_size(a, radix, &len)) != MP_OKAY) {
      return err;
   }

   buf = (char *) MP_MALLOC((size_t)len);
   if (buf == NULL) {
      return MP_MEM;
   }

   if ((err = mp_toradix(a, buf, radix)) != MP_OKAY) {
      MP_FREE_BUFFER(buf, (size_t)len);
      return err;
   }

   for (x = 0; x < len; x++) {
      if (fputc((int)buf[x], stream) == EOF) {
         MP_FREE_BUFFER(buf, (size_t)len);
         return MP_VAL;
      }
   }

   MP_FREE_BUFFER(buf, (size_t)len);
   return MP_OKAY;
}
#endif

#endif

kc3-lang/libtommath/bn_mp_fwrite.c

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