1#include <tommath.h>
2#ifdef BN_MP_SET_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/* set a 32-bit const */
19int mp_set_int (mp_int * a, unsigned long b)
20{
21  int     x, res;
22
23  mp_zero (a);
24
25  /* set four bits at a time */
26  for (x = 0; x < 8; x++) {
27    /* shift the number up four bits */
28    if ((res = mp_mul_2d (a, 4, a)) != MP_OKAY) {
29      return res;
30    }
31
32    /* OR in the top four bits of the source */
33    a->dp[0] |= (b >> 28) & 15;
34
35    /* shift the source up to the next four bits */
36    b <<= 4;
37
38    /* ensure that digits are not clamped off */
39    a->used += 1;
40  }
41  mp_clamp (a);
42  return MP_OKAY;
43}
44#endif
45
46/* $Source$ */
47/* $Revision$ */
48/* $Date$ */
49