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100644 48 lines (41 sloc) 1.082 kb
e549ccf added libtommath-0.32
Tom St Denis authored
1 #include <tommath.h>
2 #ifdef BN_MP_REDUCE_2K_SETUP_C
c1da6aa added libtommath-0.25
Tom St Denis authored
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 *
333aebc added libtommath-0.41
Tom St Denis authored
15 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
c1da6aa added libtommath-0.25
Tom St Denis authored
16 */
17
18 /* determines the setup value */
3d0fcaa added libtommath-0.34
Tom St Denis authored
19 int mp_reduce_2k_setup(mp_int *a, mp_digit *d)
c1da6aa added libtommath-0.25
Tom St Denis authored
20 {
21 int res, p;
22 mp_int tmp;
23
24 if ((res = mp_init(&tmp)) != MP_OKAY) {
25 return res;
26 }
27
28 p = mp_count_bits(a);
29 if ((res = mp_2expt(&tmp, p)) != MP_OKAY) {
30 mp_clear(&tmp);
31 return res;
32 }
33
34 if ((res = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) {
35 mp_clear(&tmp);
36 return res;
37 }
38
39 *d = tmp.dp[0];
40 mp_clear(&tmp);
41 return MP_OKAY;
42 }
e549ccf added libtommath-0.32
Tom St Denis authored
43 #endif
9294e79 added libtommath-0.36
Tom St Denis authored
44
45 /* $Source$ */
46 /* $Revision$ */
47 /* $Date$ */
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