| #include <tommath.h> |
| #ifdef BN_MP_READ_SIGNED_BIN_C |
| /* LibTomMath, multiple-precision integer library -- Tom St Denis |
| * |
| * LibTomMath is a library that provides multiple-precision |
| * integer arithmetic as well as number theoretic functionality. |
| * |
| * The library was designed directly after the MPI library by |
| * Michael Fromberger but has been written from scratch with |
| * additional optimizations in place. |
| * |
| * The library is free for all purposes without any express |
| * guarantee it works. |
| * |
| * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com |
| */ |
| |
| /* read signed bin, big endian, first byte is 0==positive or 1==negative */ |
| int mp_read_signed_bin (mp_int * a, const unsigned char *b, int c) |
| { |
| int res; |
| |
| /* read magnitude */ |
| if ((res = mp_read_unsigned_bin (a, b + 1, c - 1)) != MP_OKAY) { |
| return res; |
| } |
| |
| /* first byte is 0 for positive, non-zero for negative */ |
| if (b[0] == 0) { |
| a->sign = MP_ZPOS; |
| } else { |
| a->sign = MP_NEG; |
| } |
| |
| return MP_OKAY; |
| } |
| #endif |
| |
| /* $Source: /cvs/libtom/libtommath/bn_mp_read_signed_bin.c,v $ */ |
| /* $Revision: 1.4 $ */ |
| /* $Date: 2006/03/31 14:18:44 $ */ |
