diff options
Diffstat (limited to 'libtommath/bn_mp_exteuclid.c')
| -rw-r--r-- | libtommath/bn_mp_exteuclid.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libtommath/bn_mp_exteuclid.c b/libtommath/bn_mp_exteuclid.c index 545450b..c4ebab4 100644 --- a/libtommath/bn_mp_exteuclid.c +++ b/libtommath/bn_mp_exteuclid.c @@ -59,6 +59,13 @@ int mp_exteuclid(mp_int *a, mp_int *b, mp_int *U1, mp_int *U2, mp_int *U3) if ((err = mp_copy(&t3, &v3)) != MP_OKAY) { goto _ERR; } } + /* make sure U3 >= 0 */ + if (u3.sign == MP_NEG) { + mp_neg(&u1, &u1); + mp_neg(&u2, &u2); + mp_neg(&u3, &u3); + } + /* copy result out */ if (U1 != NULL) { mp_exch(U1, &u1); } if (U2 != NULL) { mp_exch(U2, &u2); } |