kc3-lang/libtommath/bn_mp_init.c

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• Hash : d6c6f8c3
  Author :
  Date : 2019-04-04T12:38:36
  

  use `calloc` so we don't have to zero the digits ourself this also has the nice side-effect that potential multiplication overflows in `mp_init_size` are now eliminiated

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• bn_mp_init.c

• #include "tommath_private.h"
  #ifdef BN_MP_INIT_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis
   *
   * LibTomMath is a library that provides multiple-precision
   * integer arithmetic as well as number theoretic functionality.
   *
   * The library was designed directly after the MPI library by
   * Michael Fromberger but has been written from scratch with
   * additional optimizations in place.
   *
   * SPDX-License-Identifier: Unlicense
   */
  
  /* init a new mp_int */
  int mp_init(mp_int *a)
  {
     /* allocate memory required and clear it */
     a->dp = (mp_digit *) XCALLOC((size_t)MP_PREC, sizeof(mp_digit));
     if (a->dp == NULL) {
        return MP_MEM;
     }
  
     /* set the used to zero, allocated digits to the default precision
      * and sign to positive */
     a->used  = 0;
     a->alloc = MP_PREC;
     a->sign  = MP_ZPOS;
  
     return MP_OKAY;
  }
  #endif
  
  /* ref:         $Format:%D$ */
  /* git commit:  $Format:%H$ */
  /* commit time: $Format:%ai$ */
  

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