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import binascii
import pytest
from cryptography.primitives.block import BlockCipher, ciphers, modes, padding
class TestBlockCipher(object):
def test_use_after_finalize(self):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.CBC(binascii.unhexlify(b"0" * 32), padding.NoPadding())
)
cipher.encrypt(b"a" * 16)
cipher.finalize()
with pytest.raises(ValueError):
cipher.encrypt(b"b" * 16)
with pytest.raises(ValueError):
cipher.finalize()
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