diff options
Diffstat (limited to 'crypto/bn/bn_gcd.c')
| -rw-r--r-- | crypto/bn/bn_gcd.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/crypto/bn/bn_gcd.c b/crypto/bn/bn_gcd.c index 22f80939d6..6d8c565575 100644 --- a/crypto/bn/bn_gcd.c +++ b/crypto/bn/bn_gcd.c @@ -140,7 +140,14 @@ BIGNUM *int_bn_mod_inverse(BIGNUM *in, BIGNUM *ret = NULL; int sign; - if (pnoinv) + /* This is invalid input so we don't worry about constant time here */ + if (BN_abs_is_word(n, 1) || BN_is_zero(n)) { + if (pnoinv != NULL) + *pnoinv = 1; + return NULL; + } + + if (pnoinv != NULL) *pnoinv = 0; if ((BN_get_flags(a, BN_FLG_CONSTTIME) != 0) |