diff options
Diffstat (limited to 'crypto/bn/bn_prime.c')
| -rw-r--r-- | crypto/bn/bn_prime.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/crypto/bn/bn_prime.c b/crypto/bn/bn_prime.c index 4bbd7c8810314..19b081f38eb7b 100644 --- a/crypto/bn/bn_prime.c +++ b/crypto/bn/bn_prime.c @@ -63,8 +63,12 @@ int BN_generate_prime_ex(BIGNUM *ret, int bits, int safe, /* There are no prime numbers this small. */ BNerr(BN_F_BN_GENERATE_PRIME_EX, BN_R_BITS_TOO_SMALL); return 0; - } else if (bits == 2 && safe) { - /* The smallest safe prime (7) is three bits. */ + } else if (add == NULL && safe && bits < 6 && bits != 3) { + /* + * The smallest safe prime (7) is three bits. + * But the following two safe primes with less than 6 bits (11, 23) + * are unreachable for BN_rand with BN_RAND_TOP_TWO. + */ BNerr(BN_F_BN_GENERATE_PRIME_EX, BN_R_BITS_TOO_SMALL); return 0; } |