release/src/router/dropbear/libtommath/bn_mp_init.c

   1 #include <tommath.h>
   2 #ifdef BN_MP_INIT_C
   3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
   4  *
   5  * LibTomMath is a library that provides multiple-precision
   6  * integer arithmetic as well as number theoretic functionality.
   7  *
   8  * The library was designed directly after the MPI library by
   9  * Michael Fromberger but has been written from scratch with
  10  * additional optimizations in place.
  11  *
  12  * The library is free for all purposes without any express
  13  * guarantee it works.
  14  *
  15  * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
  16  */
  17
  18 /* init a new mp_int */
  19 int mp_init (mp_int * a)
  20 {
  21   int i;
  22
  23   /* allocate memory required and clear it */
  24   a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * MP_PREC);
  25   if (a->dp == NULL) {
  26     return MP_MEM;
  27   }
  28
  29   /* set the digits to zero */
  30   for (i = 0; i < MP_PREC; i++) {
  31       a->dp[i] = 0;
  32   }
  33
  34   /* set the used to zero, allocated digits to the default precision
  35    * and sign to positive */
  36   a->used  = 0;
  37   a->alloc = MP_PREC;
  38   a->sign  = MP_ZPOS;
  39
  40   return MP_OKAY;
  41 }
  42 #endif
  43
  44 /* $Source: /cvs/libtom/libtommath/bn_mp_init.c,v $ */
  45 /* $Revision: 1.3 $ */
  46 /* $Date: 2006/03/31 14:18:44 $ */