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exchanged direct call to Miller-Rabin in mp_prime_next_prime with mp_prime_is_prime

This commit is contained in:
czurnieden 2018-05-07 23:11:04 +02:00 committed by Steffen Jaeckel
parent 06c8f3ec4e
commit 9b448bdc08
2 changed files with 5 additions and 21 deletions
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9
bn_mp_prime_is_prime.c
View File

@ -35,7 +35,6 @@ int mp_prime_is_prime(const mp_int *a, int t, int *result)
/* valid value of t? */ /* valid value of t? */
if (t > PRIME_SIZE) { if (t > PRIME_SIZE) {
puts("t > PRIME_SIZE");
return MP_VAL; return MP_VAL;
} }
@ -54,7 +53,6 @@ int mp_prime_is_prime(const mp_int *a, int t, int *result)
/* N must be odd */ /* N must be odd */
if (mp_iseven(a) == MP_YES) { if (mp_iseven(a) == MP_YES) {
*result = 0;
return MP_OKAY; return MP_OKAY;
} }
/* N is not a perfect square: floor(sqrt(N))^2 != N */ /* N is not a perfect square: floor(sqrt(N))^2 != N */
@ -62,14 +60,13 @@ int mp_prime_is_prime(const mp_int *a, int t, int *result)
return err; return err;
} }
if (res != 0) { if (res != 0) {
*result = 0;
return MP_OKAY; return MP_OKAY;
} }
/* is the input equal to one of the primes in the table? */ /* is the input equal to one of the primes in the table? */
for (ix = 0; ix < PRIME_SIZE; ix++) { for (ix = 0; ix < PRIME_SIZE; ix++) {
if (mp_cmp_d(a, ltm_prime_tab[ix]) == MP_EQ) { if (mp_cmp_d(a, ltm_prime_tab[ix]) == MP_EQ) {
*result = 1; *result = MP_YES;
return MP_OKAY; return MP_OKAY;
} }
} }
@ -126,14 +123,14 @@ int mp_prime_is_prime(const mp_int *a, int t, int *result)
} }
//#endif //#endif
// commented out for testing purposes // commented out for testing purposes
//#ifdef LTM_USE_FROBENIUS_UNDERWOOD_TEST #ifdef LTM_USE_FROBENIUS_UNDERWOOD_TEST
if ((err = mp_prime_frobenius_underwood(a, &res)) != MP_OKAY) { if ((err = mp_prime_frobenius_underwood(a, &res)) != MP_OKAY) {
goto LBL_B; goto LBL_B;
} }
if (res == MP_NO) { if (res == MP_NO) {
goto LBL_B; goto LBL_B;
} }
//#endif #endif
#endif #endif
/* /*

17
bn_mp_prime_next_prime.c
View File

@ -24,11 +24,6 @@ int mp_prime_next_prime(mp_int *a, int t, int bbs_style)
mp_digit res_tab[PRIME_SIZE], step, kstep; mp_digit res_tab[PRIME_SIZE], step, kstep;
mp_int b; mp_int b;
/* ensure t is valid */
if ((t <= 0) || (t > PRIME_SIZE)) {
return MP_VAL;
}
/* force positive */ /* force positive */
a->sign = MP_ZPOS; a->sign = MP_ZPOS;
@ -141,17 +136,9 @@ int mp_prime_next_prime(mp_int *a, int t, int bbs_style)
continue; continue;
} }
/* is this prime? */ if ((err = mp_prime_is_prime(a, t, &res)) != MP_OKAY) {
for (x = 0; x < t; x++) { goto LBL_ERR;
mp_set(&b, ltm_prime_tab[x]);
if ((err = mp_prime_miller_rabin(a, &b, &res)) != MP_OKAY) {
goto LBL_ERR;
}
if (res == MP_NO) {
break;
}
} }
if (res == MP_YES) { if (res == MP_YES) {
break; break;
} }