1 /* $NetBSD: bn_mp_to_unsigned_bin.c,v 1.1.1.2 2014/04/24 12:45:31 pettai Exp $ */
2
3 #include <tommath.h>
4 #ifdef BN_MP_TO_UNSIGNED_BIN_C
5 /* LibTomMath, multiple-precision integer library -- Tom St Denis
6 *
7 * LibTomMath is a library that provides multiple-precision
8 * integer arithmetic as well as number theoretic functionality.
9 *
10 * The library was designed directly after the MPI library by
11 * Michael Fromberger but has been written from scratch with
12 * additional optimizations in place.
13 *
14 * The library is free for all purposes without any express
15 * guarantee it works.
16 *
17 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
18 */
19
20 /* store in unsigned [big endian] format */
mp_to_unsigned_bin(mp_int * a,unsigned char * b)21 int mp_to_unsigned_bin (mp_int * a, unsigned char *b)
22 {
23 int x, res;
24 mp_int t;
25
26 if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
27 return res;
28 }
29
30 x = 0;
31 while (mp_iszero (&t) == 0) {
32 #ifndef MP_8BIT
33 b[x++] = (unsigned char) (t.dp[0] & 255);
34 #else
35 b[x++] = (unsigned char) (t.dp[0] | ((t.dp[1] & 0x01) << 7));
36 #endif
37 if ((res = mp_div_2d (&t, 8, &t, NULL)) != MP_OKAY) {
38 mp_clear (&t);
39 return res;
40 }
41 }
42 bn_reverse (b, x);
43 mp_clear (&t);
44 return MP_OKAY;
45 }
46 #endif
47
48 /* Source: /cvs/libtom/libtommath/bn_mp_to_unsigned_bin.c,v */
49 /* Revision: 1.4 */
50 /* Date: 2006/12/28 01:25:13 */
51