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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import binascii
import pytest
from cryptography.hazmat.backends.interfaces import CipherBackend
from cryptography.hazmat.primitives import padding
from cryptography.hazmat.primitives.ciphers import (
Cipher, algorithms, modes
)
@pytest.mark.requires_backend_interface(interface=CipherBackend)
@pytest.mark.wycheproof_tests("aes_cbc_pkcs5_test.json")
def test_aes_cbc_pkcs5(backend, wycheproof):
key = binascii.unhexlify(wycheproof.testcase["key"])
iv = binascii.unhexlify(wycheproof.testcase["iv"])
msg = binascii.unhexlify(wycheproof.testcase["msg"])
ct = binascii.unhexlify(wycheproof.testcase["ct"])
padder = padding.PKCS7(128).padder()
cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend)
enc = cipher.encryptor()
computed_ct = enc.update(
padder.update(msg) + padder.finalize()) + enc.finalize()
dec = cipher.decryptor()
padded_msg = dec.update(ct) + dec.finalize()
unpadder = padding.PKCS7(128).unpadder()
if wycheproof.valid or wycheproof.acceptable:
assert computed_ct == ct
computed_msg = unpadder.update(padded_msg) + unpadder.finalize()
assert computed_msg == msg
else:
assert computed_ct != ct
with pytest.raises(ValueError):
unpadder.update(padded_msg) + unpadder.finalize()
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