42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
#include <tommath_private.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, tstdenis82@gmail.com, http://libtom.org
|
|
*/
|
|
|
|
/* 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] == (unsigned char)0) {
|
|
a->sign = MP_ZPOS;
|
|
} else {
|
|
a->sign = MP_NEG;
|
|
}
|
|
|
|
return MP_OKAY;
|
|
}
|
|
#endif
|
|
|
|
/* ref: $Format:%D$ */
|
|
/* git commit: $Format:%H$ */
|
|
/* commit time: $Format:%ai$ */
|