Line data    Source code

       1             : #include <tommath.h>
       2             : #ifdef BN_MP_GET_INT_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://libtom.org
      16             :  */
      17             : 
      18             : /* get the lower 32-bits of an mp_int */
      19           0 : unsigned long mp_get_int(mp_int * a)
      20             : {
      21             :   int i;
      22             :   unsigned long res;
      23             : 
      24           0 :   if (a->used == 0) {
      25           0 :      return 0;
      26             :   }
      27             : 
      28             :   /* get number of digits of the lsb we have to read */
      29           0 :   i = MIN(a->used,(int)((sizeof(unsigned long)*CHAR_BIT+DIGIT_BIT-1)/DIGIT_BIT))-1;
      30             : 
      31             :   /* get most significant digit of result */
      32           0 :   res = DIGIT(a,i);
      33             : 
      34           0 :   while (--i >= 0) {
      35           0 :     res = (res << DIGIT_BIT) | DIGIT(a,i);
      36             :   }
      37             : 
      38             :   /* force result to 32-bits always so it is consistent on non 32-bit platforms */
      39           0 :   return res & 0xFFFFFFFFUL;
      40             : }
      41             : #endif
      42             : 
      43             : /* $Source: /cvs/libtom/libtommath/bn_mp_get_int.c,v $ */
      44             : /* $Revision: 1.4 $ */
      45             : /* $Date: 2006/12/28 01:25:13 $ */