29 lines
861 B
C
29 lines
861 B
C
/* LibTomMath, multiple-precision integer library -- Tom St Denis
|
|
*
|
|
* LibTomMath is library that provides for multiple-precision
|
|
* integer arithmetic as well as number theoretic functionality.
|
|
*
|
|
* The library is 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@iahu.ca, http://libtommath.iahu.ca
|
|
*/
|
|
#include <tommath.h>
|
|
|
|
/* read signed bin, big endian, first byte is 0==positive or 1==negative */
|
|
int
|
|
mp_read_signed_bin (mp_int * a, unsigned char *b, int c)
|
|
{
|
|
int res;
|
|
|
|
if ((res = mp_read_unsigned_bin (a, b + 1, c - 1)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
a->sign = ((b[0] == (unsigned char) 0) ? MP_ZPOS : MP_NEG);
|
|
return MP_OKAY;
|
|
}
|