diff options
Diffstat (limited to 'eddsa-sign.c')
| -rw-r--r-- | eddsa-sign.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/eddsa-sign.c b/eddsa-sign.c index 5832c23a..13ae4799 100644 --- a/eddsa-sign.c +++ b/eddsa-sign.c @@ -93,7 +93,7 @@ _eddsa_sign (const struct ecc_curve *ecc, unsigned shift; mp_limb_t cy; assert (ecc->p.bit_size == 255); - shift = 252 - GMP_NUMB_BITS * (ecc->p.size - 1); + shift = ecc->q.bit_size - 1 - GMP_NUMB_BITS * (ecc->p.size - 1); cy = mpn_submul_1 (sp, ecc->q.m, ecc->p.size, sp[ecc->p.size-1] >> shift); assert (cy < 2); |