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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Test using the NIST Test Vectors
"""
from __future__ import absolute_import, division, print_function
import binascii
import itertools
import os
import pytest
from cryptography.primitives.block import BlockCipher, ciphers, modes
from ..utils import load_nist_vectors_from_file
def parameterize_encrypt_test(cipher, vector_type, fnames):
return pytest.mark.parametrize(("key", "iv", "plaintext", "ciphertext"),
list(itertools.chain.from_iterable(
load_nist_vectors_from_file(
os.path.join(cipher, vector_type, fname),
"ENCRYPT",
["key", "iv", "plaintext", "ciphertext"],
)
for fname in fnames
))
)
class TestAES_CBC(object):
@parameterize_encrypt_test("AES", "KAT", [
"CBCGFSbox128.rsp",
"CBCGFSbox192.rsp",
"CBCGFSbox256.rsp",
"CBCKeySbox128.rsp",
"CBCKeySbox192.rsp",
"CBCKeySbox256.rsp",
"CBCVarKey128.rsp",
"CBCVarKey192.rsp",
"CBCVarKey256.rsp",
"CBCVarTxt128.rsp",
"CBCVarTxt192.rsp",
"CBCVarTxt256.rsp",
])
def test_KAT(self, key, iv, plaintext, ciphertext):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(key)),
modes.CBC(binascii.unhexlify(iv)),
)
actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
actual_ciphertext += cipher.finalize()
assert binascii.hexlify(actual_ciphertext) == ciphertext
@parameterize_encrypt_test("AES", "MMT", [
"CBCMMT128.rsp",
"CBCMMT192.rsp",
"CBCMMT256.rsp",
])
def test_MMT(self, key, iv, plaintext, ciphertext):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(key)),
modes.CBC(binascii.unhexlify(iv)),
)
actual_ciphertext = cipher.encrypt(binascii.unhexlify(plaintext))
actual_ciphertext += cipher.finalize()
assert binascii.hexlify(actual_ciphertext) == ciphertext
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