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comparison libtommath/bn_mp_read_signed_bin.c @ 389:5ff8218bcee9

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propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e) to branch 'au.asn.ucc.matt.dropbear' (head ecd779509ef23a8cdf64888904fc9b31d78aa933)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 03:14:55 +0000
parents eed26cff980b
children 60fc6476e044
comparison
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388:fb54020f78e1 389:5ff8218bcee9
1 #include <tommath.h>
2 #ifdef BN_MP_READ_SIGNED_BIN_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, [email protected], http://math.libtomcrypt.com
16 */
17
18 /* read signed bin, big endian, first byte is 0==positive or 1==negative */
19 int mp_read_signed_bin (mp_int * a, const unsigned char *b, int c)
20 {
21 int res;
22
23 /* read magnitude */
24 if ((res = mp_read_unsigned_bin (a, b + 1, c - 1)) != MP_OKAY) {
25 return res;
26 }
27
28 /* first byte is 0 for positive, non-zero for negative */
29 if (b[0] == 0) {
30 a->sign = MP_ZPOS;
31 } else {
32 a->sign = MP_NEG;
33 }
34
35 return MP_OKAY;
36 }
37 #endif
38
39 /* $Source: /cvs/libtom/libtommath/bn_mp_read_signed_bin.c,v $ */
40 /* $Revision: 1.4 $ */
41 /* $Date: 2006/03/31 14:18:44 $ */