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Merge branch 'pr/78' into develop

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This closes #78
This commit is contained in:
Steffen Jaeckel 2017-06-06 21:35:08 +02:00
commit 72d116a5b6
2 changed files with 20 additions and 22 deletions
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39
bn_mp_exteuclid.c
View File

@ -29,41 +29,41 @@ int mp_exteuclid(mp_int *a, mp_int *b, mp_int *U1, mp_int *U2, mp_int *U3)
/* initialize, (u1,u2,u3) = (1,0,a) */
mp_set(&u1, 1);
if ((err = mp_copy(a, &u3)) != MP_OKAY) { goto _ERR; }
if ((err = mp_copy(a, &u3)) != MP_OKAY) { goto LBL_ERR; }
/* initialize, (v1,v2,v3) = (0,1,b) */
mp_set(&v2, 1);
if ((err = mp_copy(b, &v3)) != MP_OKAY) { goto _ERR; }
if ((err = mp_copy(b, &v3)) != MP_OKAY) { goto LBL_ERR; }
/* loop while v3 != 0 */
while (mp_iszero(&v3) == MP_NO) {
/* q = u3/v3 */
if ((err = mp_div(&u3, &v3, &q, NULL)) != MP_OKAY) { goto _ERR; }
if ((err = mp_div(&u3, &v3, &q, NULL)) != MP_OKAY) { goto LBL_ERR; }
/* (t1,t2,t3) = (u1,u2,u3) - (v1,v2,v3)q */
if ((err = mp_mul(&v1, &q, &tmp)) != MP_OKAY) { goto _ERR; }
if ((err = mp_sub(&u1, &tmp, &t1)) != MP_OKAY) { goto _ERR; }
if ((err = mp_mul(&v2, &q, &tmp)) != MP_OKAY) { goto _ERR; }
if ((err = mp_sub(&u2, &tmp, &t2)) != MP_OKAY) { goto _ERR; }
if ((err = mp_mul(&v3, &q, &tmp)) != MP_OKAY) { goto _ERR; }
if ((err = mp_sub(&u3, &tmp, &t3)) != MP_OKAY) { goto _ERR; }
if ((err = mp_mul(&v1, &q, &tmp)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_sub(&u1, &tmp, &t1)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_mul(&v2, &q, &tmp)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_sub(&u2, &tmp, &t2)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_mul(&v3, &q, &tmp)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_sub(&u3, &tmp, &t3)) != MP_OKAY) { goto LBL_ERR; }
/* (u1,u2,u3) = (v1,v2,v3) */
if ((err = mp_copy(&v1, &u1)) != MP_OKAY) { goto _ERR; }
if ((err = mp_copy(&v2, &u2)) != MP_OKAY) { goto _ERR; }
if ((err = mp_copy(&v3, &u3)) != MP_OKAY) { goto _ERR; }
if ((err = mp_copy(&v1, &u1)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_copy(&v2, &u2)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_copy(&v3, &u3)) != MP_OKAY) { goto LBL_ERR; }
/* (v1,v2,v3) = (t1,t2,t3) */
if ((err = mp_copy(&t1, &v1)) != MP_OKAY) { goto _ERR; }
if ((err = mp_copy(&t2, &v2)) != MP_OKAY) { goto _ERR; }
if ((err = mp_copy(&t3, &v3)) != MP_OKAY) { goto _ERR; }
if ((err = mp_copy(&t1, &v1)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_copy(&t2, &v2)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_copy(&t3, &v3)) != MP_OKAY) { goto LBL_ERR; }
}
/* make sure U3 >= 0 */
if (u3.sign == MP_NEG) {
if ((err = mp_neg(&u1, &u1)) != MP_OKAY) { goto _ERR; }
if ((err = mp_neg(&u2, &u2)) != MP_OKAY) { goto _ERR; }
if ((err = mp_neg(&u3, &u3)) != MP_OKAY) { goto _ERR; }
if ((err = mp_neg(&u1, &u1)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_neg(&u2, &u2)) != MP_OKAY) { goto LBL_ERR; }
if ((err = mp_neg(&u3, &u3)) != MP_OKAY) { goto LBL_ERR; }
}
/* copy result out */
@ -72,7 +72,8 @@ int mp_exteuclid(mp_int *a, mp_int *b, mp_int *U1, mp_int *U2, mp_int *U3)
if (U3 != NULL) { mp_exch(U3, &u3); }
err = MP_OKAY;
_ERR: mp_clear_multi(&u1, &u2, &u3, &v1, &v2, &v3, &t1, &t2, &t3, &q, &tmp, NULL);
LBL_ERR:
mp_clear_multi(&u1, &u2, &u3, &v1, &v2, &v3, &t1, &t2, &t3, &q, &tmp, NULL);
return err;
}
#endif

3
bn_mp_init_multi.c
View File

@ -31,9 +31,6 @@ int mp_init_multi(mp_int *mp, ...)
*/
va_list clean_args;
/* end the current list */
va_end(args);
/* now start cleaning up */
cur_arg = mp;
va_start(clean_args, mp);