diff options
Diffstat (limited to 'libtommath/bn_mp_add_d.c')
| -rw-r--r-- | libtommath/bn_mp_add_d.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/libtommath/bn_mp_add_d.c b/libtommath/bn_mp_add_d.c index bdd0280..5281ad4 100644 --- a/libtommath/bn_mp_add_d.c +++ b/libtommath/bn_mp_add_d.c @@ -12,7 +12,7 @@ * The library is free for all purposes without any express * guarantee it works. * - * Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org + * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com */ /* single digit addition */ @@ -37,8 +37,12 @@ mp_add_d (mp_int * a, mp_digit b, mp_int * c) /* c = |a| - b */ res = mp_sub_d(a, b, c); - /* fix sign */ - a->sign = c->sign = MP_NEG; + /* fix signs */ + a->sign = MP_NEG; + c->sign = (c->used) ? MP_NEG : MP_ZPOS; + + /* clamp */ + mp_clamp(c); return res; } |