diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/cryptography/hazmat/backends/openssl/backend.py | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py index 59503bd9..60aa4531 100644 --- a/src/cryptography/hazmat/backends/openssl/backend.py +++ b/src/cryptography/hazmat/backends/openssl/backend.py @@ -327,7 +327,8 @@ class Backend(object): bn_num_bytes = (self._lib.BN_num_bits(bn) + 7) // 8 bin_ptr = self._ffi.new("unsigned char[]", bn_num_bytes) bin_len = self._lib.BN_bn2bin(bn, bin_ptr) - assert bin_len > 0 + # A zero length means the BN has value 0 + assert bin_len >= 0 assert bin_ptr != self._ffi.NULL return int.from_bytes(self._ffi.buffer(bin_ptr)[:bin_len], "big") |