diff options
Diffstat (limited to 'openssl/crypto/bn/bn_exp.c')
| -rw-r--r-- | openssl/crypto/bn/bn_exp.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/openssl/crypto/bn/bn_exp.c b/openssl/crypto/bn/bn_exp.c index 5e7eb3373..611fa3262 100644 --- a/openssl/crypto/bn/bn_exp.c +++ b/openssl/crypto/bn/bn_exp.c @@ -874,7 +874,14 @@ int BN_mod_exp_mont_word(BIGNUM *rr, BN_ULONG a, const BIGNUM *p, bits = BN_num_bits(p); if (bits == 0) { - ret = BN_one(rr); + /* x**0 mod 1 is still zero. */ + if (BN_is_one(m)) + { + ret = 1; + BN_zero(rr); + } + else + ret = BN_one(rr); return ret; } if (a == 0) |