mirror of http://galexander.org/git/simplesshd.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
1.1 KiB
45 lines
1.1 KiB
#include "tommath_private.h"
|
|
#ifdef BN_MP_LCM_C
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
|
|
/* SPDX-License-Identifier: Unlicense */
|
|
|
|
/* computes least common multiple as |a*b|/(a, b) */
|
|
mp_err mp_lcm(const mp_int *a, const mp_int *b, mp_int *c)
|
|
{
|
|
mp_err err;
|
|
mp_int t1, t2;
|
|
|
|
|
|
if ((err = mp_init_multi(&t1, &t2, NULL)) != MP_OKAY) {
|
|
return err;
|
|
}
|
|
|
|
/* t1 = get the GCD of the two inputs */
|
|
if ((err = mp_gcd(a, b, &t1)) != MP_OKAY) {
|
|
goto LBL_T;
|
|
}
|
|
|
|
/* divide the smallest by the GCD */
|
|
if (mp_cmp_mag(a, b) == MP_LT) {
|
|
/* store quotient in t2 such that t2 * b is the LCM */
|
|
if ((err = mp_div(a, &t1, &t2, NULL)) != MP_OKAY) {
|
|
goto LBL_T;
|
|
}
|
|
err = mp_mul(b, &t2, c);
|
|
} else {
|
|
/* store quotient in t2 such that t2 * a is the LCM */
|
|
if ((err = mp_div(b, &t1, &t2, NULL)) != MP_OKAY) {
|
|
goto LBL_T;
|
|
}
|
|
err = mp_mul(a, &t2, c);
|
|
}
|
|
|
|
/* fix the sign to positive */
|
|
c->sign = MP_ZPOS;
|
|
|
|
LBL_T:
|
|
mp_clear_multi(&t1, &t2, NULL);
|
|
return err;
|
|
}
|
|
#endif
|