37 lines
920 B
C
37 lines
920 B
C
|
#include "tommath_private.h"
|
||
|
|
#ifdef BN_MP_TC_DIV_2D_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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* two complement right shift */
|
||
|
|
int mp_tc_div_2d(const mp_int *a, int b, mp_int *c)
|
||
|
|
{
|
||
|
|
int res;
|
||
|
|
if (!mp_isneg(a)) {
|
||
|
|
return mp_div_2d(a, b, c, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
res = mp_add_d(a, 1, c);
|
||
|
|
if (res != MP_OKAY) {
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
res = mp_div_2d(c, b, c, 0);
|
||
|
|
return res == MP_OKAY ? mp_sub_d(c, 1, c) : res;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* ref: $Format:%D$ */
|
||
|
|
/* git commit: $Format:%H$ */
|
||
|
|
/* commit time: $Format:%ai$ */
|