/home/ntakagi/work/tcl8.5.1/libtommath/bn_mp_init.c Source File

00001 #include <tommath.h>
00002 #ifdef BN_MP_INIT_C
00003 /* LibTomMath, multiple-precision integer library -- Tom St Denis
00004  *
00005  * LibTomMath is a library that provides multiple-precision
00006  * integer arithmetic as well as number theoretic functionality.
00007  *
00008  * The library was designed directly after the MPI library by
00009  * Michael Fromberger but has been written from scratch with
00010  * additional optimizations in place.
00011  *
00012  * The library is free for all purposes without any express
00013  * guarantee it works.
00014  *
00015  * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
00016  */
00017 
00018 /* init a new mp_int */
00019 int mp_init (mp_int * a)
00020 {
00021   int i;
00022 
00023   /* allocate memory required and clear it */
00024   a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * MP_PREC);
00025   if (a->dp == NULL) {
00026     return MP_MEM;
00027   }
00028 
00029   /* set the digits to zero */
00030   for (i = 0; i < MP_PREC; i++) {
00031       a->dp[i] = 0;
00032   }
00033 
00034   /* set the used to zero, allocated digits to the default precision
00035    * and sign to positive */
00036   a->used  = 0;
00037   a->alloc = MP_PREC;
00038   a->sign  = MP_ZPOS;
00039 
00040   return MP_OKAY;
00041 }
00042 #endif
00043 
00044 /* $Source: /cvsroot/tcl/libtommath/bn_mp_init.c,v $ */
00045 /* $Revision: 1.1.1.3 $ */
00046 /* $Date: 2006/12/01 00:08:11 $ */