42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
#include "tommath_private.h"
|
|
#ifdef BN_MP_REDUCE_IS_2K_L_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.
|
|
*
|
|
* SPDX-License-Identifier: Unlicense
|
|
*/
|
|
|
|
/* determines if reduce_2k_l can be used */
|
|
int mp_reduce_is_2k_l(const mp_int *a)
|
|
{
|
|
int ix, iy;
|
|
|
|
if (a->used == 0) {
|
|
return MP_NO;
|
|
} else if (a->used == 1) {
|
|
return MP_YES;
|
|
} else if (a->used > 1) {
|
|
/* if more than half of the digits are -1 we're sold */
|
|
for (iy = ix = 0; ix < a->used; ix++) {
|
|
if (a->dp[ix] == MP_MASK) {
|
|
++iy;
|
|
}
|
|
}
|
|
return (iy >= (a->used/2)) ? MP_YES : MP_NO;
|
|
|
|
}
|
|
return MP_NO;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* ref: $Format:%D$ */
|
|
/* git commit: $Format:%H$ */
|
|
/* commit time: $Format:%ai$ */
|