diff options
Diffstat (limited to 'crypto/bn/bn_exp.c')
-rw-r--r-- | crypto/bn/bn_exp.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/crypto/bn/bn_exp.c b/crypto/bn/bn_exp.c index 24afdd6..50cf323 100644 --- a/crypto/bn/bn_exp.c +++ b/crypto/bn/bn_exp.c @@ -662,12 +662,13 @@ int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p, bn_check_top(p); bn_check_top(m); - top = m->top; - - if (!(m->d[0] & 1)) { + if (!BN_is_odd(m)) { BNerr(BN_F_BN_MOD_EXP_MONT_CONSTTIME, BN_R_CALLED_WITH_EVEN_MODULUS); return (0); } + + top = m->top; + bits = BN_num_bits(p); if (bits == 0) { ret = BN_one(rr); |