diff options
Diffstat (limited to 'libtommath/bn_mp_neg.c')
| -rw-r--r-- | libtommath/bn_mp_neg.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/libtommath/bn_mp_neg.c b/libtommath/bn_mp_neg.c index 3a991db..159cd74 100644 --- a/libtommath/bn_mp_neg.c +++ b/libtommath/bn_mp_neg.c @@ -19,12 +19,18 @@ int mp_neg (mp_int * a, mp_int * b) { int res; - if ((res = mp_copy (a, b)) != MP_OKAY) { - return res; + if (a != b) { + if ((res = mp_copy (a, b)) != MP_OKAY) { + return res; + } } + if (mp_iszero(b) != MP_YES) { b->sign = (a->sign == MP_ZPOS) ? MP_NEG : MP_ZPOS; + } else { + b->sign = MP_ZPOS; } + return MP_OKAY; } #endif |