bf9507a9d4
* This gives the advantage that static analysis **understands** bool, but complains about using an enum type instead of bool. * If stdbool.h is not desired, true/false/bool can be replaced using sed as in the no-stdint-h branch. * We already include stdint.h and stdbool.h is not more harmful than this header
36 lines
807 B
C
36 lines
807 B
C
#include "tommath_private.h"
|
|
#ifdef S_MP_PRIME_IS_DIVISIBLE_C
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
|
|
/* SPDX-License-Identifier: Unlicense */
|
|
|
|
/* determines if an integers is divisible by one
|
|
* of the first PRIME_SIZE primes or not
|
|
*
|
|
* sets result to 0 if not, 1 if yes
|
|
*/
|
|
mp_err s_mp_prime_is_divisible(const mp_int *a, bool *result)
|
|
{
|
|
int ix;
|
|
mp_err err;
|
|
mp_digit res;
|
|
|
|
/* default to not */
|
|
*result = false;
|
|
|
|
for (ix = 0; ix < MP_PRIME_TAB_SIZE; ix++) {
|
|
/* what is a mod LBL_prime_tab[ix] */
|
|
if ((err = mp_mod_d(a, s_mp_prime_tab[ix], &res)) != MP_OKAY) {
|
|
return err;
|
|
}
|
|
|
|
/* is the residue zero? */
|
|
if (res == 0u) {
|
|
*result = true;
|
|
return MP_OKAY;
|
|
}
|
|
}
|
|
|
|
return MP_OKAY;
|
|
}
|
|
#endif
|