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Fix mp_mod(a, b, c) if b < 0 and a = n * b, n integer

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it used to return b, now it return 0.
This commit is contained in:
Moritz Lenz 2012-01-08 20:49:01 +01:00
parent abb79ebfed
commit 265651b2c7
1 changed files with 4 additions and 4 deletions
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8
bn_mp_mod.c
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@ -15,7 +15,7 @@
* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
*/
/* c = a mod b, 0 <= c < b */
/* c = a mod b, 0 <= c < b if b > 0, b < c <= 0 if b < 0 */
int
mp_mod (mp_int * a, mp_int * b, mp_int * c)
{
@ -31,11 +31,11 @@ mp_mod (mp_int * a, mp_int * b, mp_int * c)
return res;
}
if (t.sign != b->sign) {
res = mp_add (b, &t, c);
} else {
if (mp_iszero(&t) || t.sign == b->sign) {
res = MP_OKAY;
mp_exch (&t, c);
} else {
res = mp_add (b, &t, c);
}
mp_clear (&t);