46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#include <tommath_private.h>
|
|
#ifdef BN_MP_GET_INT_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
|
|
*/
|
|
|
|
/* get the lower 32-bits of an mp_int */
|
|
unsigned long mp_get_int(mp_int *a)
|
|
{
|
|
int i;
|
|
mp_min_u32 res;
|
|
|
|
if (a->used == 0) {
|
|
return 0;
|
|
}
|
|
|
|
/* get number of digits of the lsb we have to read */
|
|
i = MIN(a->used, (int)(((sizeof(unsigned long) * CHAR_BIT) + DIGIT_BIT - 1) / DIGIT_BIT)) - 1;
|
|
|
|
/* get most significant digit of result */
|
|
res = DIGIT(a, i);
|
|
|
|
while (--i >= 0) {
|
|
res = (res << DIGIT_BIT) | DIGIT(a, i);
|
|
}
|
|
|
|
/* force result to 32-bits always so it is consistent on non 32-bit platforms */
|
|
return res & 0xFFFFFFFFUL;
|
|
}
|
|
#endif
|
|
|
|
/* ref: $Format:%D$ */
|
|
/* git commit: $Format:%H$ */
|
|
/* commit time: $Format:%ai$ */
|