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, tomstdenis@gmail.com, http://libtom.org
16 */
17
18/* read signed bin, big endian, first byte is 0==positive or 1==negative */
19int 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/* $Source$ */
40/* $Revision$ */
41/* $Date$ */
42