diff options
| -rw-r--r-- | crypto/bn/bn_prime.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/bn/bn_prime.c b/crypto/bn/bn_prime.c index d03403a600..d57f658211 100644 --- a/crypto/bn/bn_prime.c +++ b/crypto/bn/bn_prime.c @@ -258,7 +258,8 @@ int BN_is_prime_fasttest_ex(const BIGNUM *a, int checks, BN_CTX *ctx_passed, /* first look for small factors */ if (!BN_is_odd(a)) - return 0; + /* a is even => a is prime if and only if a == 2 */ + return BN_is_word(a, 2); if (do_trial_division) { for (i = 1; i < NUMPRIMES; i++) |