c3-lang/libtommath/bn_mp_init_size.c

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• Hash : 4e3f1344
  Author :
  Date : 2015-11-12T01:49:07
  

  provide tommath_private.h tommath.h contains declarations for the public part of the library. tommath_private.h contains the functions which are private to ltm and should not be exposed to the public.

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• bn_mp_init_size.c

• #include <tommath_private.h>
  #ifdef BN_MP_INIT_SIZE_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.
   *
   * The library is free for all purposes without any express
   * guarantee it works.
   *
   * Tom St Denis, tstdenis82@gmail.com, http://libtom.org
   */
  
  /* init an mp_init for a given size */
  int mp_init_size (mp_int * a, int size)
  {
    int x;
  
    /* pad size so there are always extra digits */
    size += (MP_PREC * 2) - (size % MP_PREC);	
    
    /* alloc mem */
    a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * size);
    if (a->dp == NULL) {
      return MP_MEM;
    }
  
    /* set the members */
    a->used  = 0;
    a->alloc = size;
    a->sign  = MP_ZPOS;
  
    /* zero the digits */
    for (x = 0; x < size; x++) {
        a->dp[x] = 0;
    }
  
    return MP_OKAY;
  }
  #endif
  
  /* $Source$ */
  /* $Revision$ */
  /* $Date$ */
  

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