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://math.libtomcrypt.com
16 */
17
18/* get the lower 32-bits of an mp_int */
19unsigned long mp_get_int(mp_int * a)
20{
21  int i;
22  unsigned long res;
23
24  if (a->used == 0) {
25     return 0;
26  }
27
28  /* get number of digits of the lsb we have to read */
29  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  res = DIGIT(a,i);
33
34  while (--i >= 0) {
35    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  return res & 0xFFFFFFFFUL;
40}
41#endif
42
43/* $Source: /cvs/libtom/libtommath/bn_mp_get_int.c,v $ */
44/* $Revision: 1.3 $ */
45/* $Date: 2006/03/31 14:18:44 $ */
46