Mercurial > dropbear
comparison bn_mp_to_unsigned_bin.c @ 2:86e0b50a9b58 libtommath-orig ltm-0.30-orig
ltm 0.30 orig import
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 31 May 2004 18:25:22 +0000 |
parents | |
children | d29b64170cf0 |
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-1:000000000000 | 2:86e0b50a9b58 |
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1 /* LibTomMath, multiple-precision integer library -- Tom St Denis | |
2 * | |
3 * LibTomMath is a library that provides multiple-precision | |
4 * integer arithmetic as well as number theoretic functionality. | |
5 * | |
6 * The library was designed directly after the MPI library by | |
7 * Michael Fromberger but has been written from scratch with | |
8 * additional optimizations in place. | |
9 * | |
10 * The library is free for all purposes without any express | |
11 * guarantee it works. | |
12 * | |
13 * Tom St Denis, [email protected], http://math.libtomcrypt.org | |
14 */ | |
15 #include <tommath.h> | |
16 | |
17 /* store in unsigned [big endian] format */ | |
18 int | |
19 mp_to_unsigned_bin (mp_int * a, unsigned char *b) | |
20 { | |
21 int x, res; | |
22 mp_int t; | |
23 | |
24 if ((res = mp_init_copy (&t, a)) != MP_OKAY) { | |
25 return res; | |
26 } | |
27 | |
28 x = 0; | |
29 while (mp_iszero (&t) == 0) { | |
30 #ifndef MP_8BIT | |
31 b[x++] = (unsigned char) (t.dp[0] & 255); | |
32 #else | |
33 b[x++] = (unsigned char) (t.dp[0] | ((t.dp[1] & 0x01) << 7)); | |
34 #endif | |
35 if ((res = mp_div_2d (&t, 8, &t, NULL)) != MP_OKAY) { | |
36 mp_clear (&t); | |
37 return res; | |
38 } | |
39 } | |
40 bn_reverse (b, x); | |
41 mp_clear (&t); | |
42 return MP_OKAY; | |
43 } |