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-rw-r--r--crypto/bn/bn_exp.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/crypto/bn/bn_exp.c b/crypto/bn/bn_exp.c
index 24afdd60a227..50cf3231b07b 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);