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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.
from __future__ import absolute_import, division, print_function
import binascii
import os
import itertools
import pytest
from cryptography.hazmat.primitives import hashes, hmac
from cryptography.hazmat.primitives.asymmetric import rsa, padding
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from cryptography.hazmat.primitives.ciphers import Cipher
from cryptography.hazmat.primitives.kdf.hkdf import HKDF
from cryptography.exceptions import (
AlreadyFinalized, NotYetFinalized, AlreadyUpdated, InvalidTag,
)
from ...utils import load_vectors_from_file
def _load_all_params(path, file_names, param_loader):
all_params = []
for file_name in file_names:
all_params.extend(
load_vectors_from_file(os.path.join(path, file_name), param_loader)
)
return all_params
def generate_encrypt_test(param_loader, path, file_names, cipher_factory,
mode_factory):
all_params = _load_all_params(path, file_names, param_loader)
@pytest.mark.parametrize("params", all_params)
def test_encryption(self, backend, params):
encrypt_test(backend, cipher_factory, mode_factory, params)
return test_encryption
def encrypt_test(backend, cipher_factory, mode_factory, params):
plaintext = params["plaintext"]
ciphertext = params["ciphertext"]
cipher = Cipher(
cipher_factory(**params),
mode_factory(**params),
backend=backend
)
encryptor = cipher.encryptor()
actual_ciphertext = encryptor.update(binascii.unhexlify(plaintext))
actual_ciphertext += encryptor.finalize()
assert actual_ciphertext == binascii.unhexlify(ciphertext)
decryptor = cipher.decryptor()
actual_plaintext = decryptor.update(binascii.unhexlify(ciphertext))
actual_plaintext += decryptor.finalize()
assert actual_plaintext == binascii.unhexlify(plaintext)
def generate_aead_test(param_loader, path, file_names, cipher_factory,
mode_factory):
all_params = _load_all_params(path, file_names, param_loader)
@pytest.mark.parametrize("params", all_params)
def test_aead(self, backend, params):
aead_test(backend, cipher_factory, mode_factory, params)
return test_aead
def aead_test(backend, cipher_factory, mode_factory, params):
if params.get("pt") is not None:
plaintext = params["pt"]
ciphertext = params["ct"]
aad = params["aad"]
if params.get("fail") is True:
cipher = Cipher(
cipher_factory(binascii.unhexlify(params["key"])),
mode_factory(binascii.unhexlify(params["iv"]),
binascii.unhexlify(params["tag"])),
backend
)
decryptor = cipher.decryptor()
decryptor.authenticate_additional_data(binascii.unhexlify(aad))
actual_plaintext = decryptor.update(binascii.unhexlify(ciphertext))
with pytest.raises(InvalidTag):
decryptor.finalize()
else:
cipher = Cipher(
cipher_factory(binascii.unhexlify(params["key"])),
mode_factory(binascii.unhexlify(params["iv"]), None),
backend
)
encryptor = cipher.encryptor()
encryptor.authenticate_additional_data(binascii.unhexlify(aad))
actual_ciphertext = encryptor.update(binascii.unhexlify(plaintext))
actual_ciphertext += encryptor.finalize()
tag_len = len(params["tag"])
assert binascii.hexlify(encryptor.tag)[:tag_len] == params["tag"]
cipher = Cipher(
cipher_factory(binascii.unhexlify(params["key"])),
mode_factory(binascii.unhexlify(params["iv"]),
binascii.unhexlify(params["tag"])),
backend
)
decryptor = cipher.decryptor()
decryptor.authenticate_additional_data(binascii.unhexlify(aad))
actual_plaintext = decryptor.update(binascii.unhexlify(ciphertext))
actual_plaintext += decryptor.finalize()
assert actual_plaintext == binascii.unhexlify(plaintext)
def generate_stream_encryption_test(param_loader, path, file_names,
cipher_factory):
all_params = _load_all_params(path, file_names, param_loader)
@pytest.mark.parametrize("params", all_params)
def test_stream_encryption(self, backend, params):
stream_encryption_test(backend, cipher_factory, params)
return test_stream_encryption
def stream_encryption_test(backend, cipher_factory, params):
plaintext = params["plaintext"]
ciphertext = params["ciphertext"]
offset = params["offset"]
cipher = Cipher(cipher_factory(**params), None, backend=backend)
encryptor = cipher.encryptor()
# throw away offset bytes
encryptor.update(b"\x00" * int(offset))
actual_ciphertext = encryptor.update(binascii.unhexlify(plaintext))
actual_ciphertext += encryptor.finalize()
assert actual_ciphertext == binascii.unhexlify(ciphertext)
decryptor = cipher.decryptor()
decryptor.update(b"\x00" * int(offset))
actual_plaintext = decryptor.update(binascii.unhexlify(ciphertext))
actual_plaintext += decryptor.finalize()
assert actual_plaintext == binascii.unhexlify(plaintext)
def generate_hash_test(param_loader, path, file_names, hash_cls):
all_params = _load_all_params(path, file_names, param_loader)
@pytest.mark.parametrize("params", all_params)
def test_hash(self, backend, params):
hash_test(backend, hash_cls, params)
return test_hash
def hash_test(backend, algorithm, params):
msg, md = params
m = hashes.Hash(algorithm, backend=backend)
m.update(binascii.unhexlify(msg))
expected_md = md.replace(" ", "").lower().encode("ascii")
assert m.finalize() == binascii.unhexlify(expected_md)
def generate_base_hash_test(algorithm, digest_size, block_size):
def test_base_hash(self, backend):
base_hash_test(backend, algorithm, digest_size, block_size)
return test_base_hash
def base_hash_test(backend, algorithm, digest_size, block_size):
m = hashes.Hash(algorithm, backend=backend)
assert m.algorithm.digest_size == digest_size
assert m.algorithm.block_size == block_size
m_copy = m.copy()
assert m != m_copy
assert m._ctx != m_copy._ctx
m.update(b"abc")
copy = m.copy()
copy.update(b"123")
m.update(b"123")
assert copy.finalize() == m.finalize()
def generate_long_string_hash_test(hash_factory, md):
def test_long_string_hash(self, backend):
long_string_hash_test(backend, hash_factory, md)
return test_long_string_hash
def long_string_hash_test(backend, algorithm, md):
m = hashes.Hash(algorithm, backend=backend)
m.update(b"a" * 1000000)
assert m.finalize() == binascii.unhexlify(md.lower().encode("ascii"))
def generate_base_hmac_test(hash_cls):
def test_base_hmac(self, backend):
base_hmac_test(backend, hash_cls)
return test_base_hmac
def base_hmac_test(backend, algorithm):
key = b"ab"
h = hmac.HMAC(binascii.unhexlify(key), algorithm, backend=backend)
h_copy = h.copy()
assert h != h_copy
assert h._ctx != h_copy._ctx
def generate_hmac_test(param_loader, path, file_names, algorithm):
all_params = _load_all_params(path, file_names, param_loader)
@pytest.mark.parametrize("params", all_params)
def test_hmac(self, backend, params):
hmac_test(backend, algorithm, params)
return test_hmac
def hmac_test(backend, algorithm, params):
msg, md, key = params
h = hmac.HMAC(binascii.unhexlify(key), algorithm, backend=backend)
h.update(binascii.unhexlify(msg))
assert h.finalize() == binascii.unhexlify(md.encode("ascii"))
def generate_pbkdf2_test(param_loader, path, file_names, algorithm):
all_params = _load_all_params(path, file_names, param_loader)
@pytest.mark.parametrize("params", all_params)
def test_pbkdf2(self, backend, params):
pbkdf2_test(backend, algorithm, params)
return test_pbkdf2
def pbkdf2_test(backend, algorithm, params):
# Password and salt can contain \0, which should be loaded as a null char.
# The NIST loader loads them as literal strings so we replace with the
# proper value.
kdf = PBKDF2HMAC(
algorithm,
int(params["length"]),
params["salt"],
int(params["iterations"]),
backend
)
derived_key = kdf.derive(params["password"])
assert binascii.hexlify(derived_key) == params["derived_key"]
def generate_aead_exception_test(cipher_factory, mode_factory):
def test_aead_exception(self, backend):
aead_exception_test(backend, cipher_factory, mode_factory)
return test_aead_exception
def aead_exception_test(backend, cipher_factory, mode_factory):
cipher = Cipher(
cipher_factory(binascii.unhexlify(b"0" * 32)),
mode_factory(binascii.unhexlify(b"0" * 24)),
backend
)
encryptor = cipher.encryptor()
encryptor.update(b"a" * 16)
with pytest.raises(NotYetFinalized):
encryptor.tag
with pytest.raises(AlreadyUpdated):
encryptor.authenticate_additional_data(b"b" * 16)
encryptor.finalize()
with pytest.raises(AlreadyFinalized):
encryptor.authenticate_additional_data(b"b" * 16)
with pytest.raises(AlreadyFinalized):
encryptor.update(b"b" * 16)
with pytest.raises(AlreadyFinalized):
encryptor.finalize()
cipher = Cipher(
cipher_factory(binascii.unhexlify(b"0" * 32)),
mode_factory(binascii.unhexlify(b"0" * 24), b"0" * 16),
backend
)
decryptor = cipher.decryptor()
decryptor.update(b"a" * 16)
with pytest.raises(AttributeError):
decryptor.tag
def generate_aead_tag_exception_test(cipher_factory, mode_factory):
def test_aead_tag_exception(self, backend):
aead_tag_exception_test(backend, cipher_factory, mode_factory)
return test_aead_tag_exception
def aead_tag_exception_test(backend, cipher_factory, mode_factory):
cipher = Cipher(
cipher_factory(binascii.unhexlify(b"0" * 32)),
mode_factory(binascii.unhexlify(b"0" * 24)),
backend
)
with pytest.raises(ValueError):
cipher.decryptor()
with pytest.raises(ValueError):
mode_factory(binascii.unhexlify(b"0" * 24), b"000")
cipher = Cipher(
cipher_factory(binascii.unhexlify(b"0" * 32)),
mode_factory(binascii.unhexlify(b"0" * 24), b"0" * 16),
backend
)
with pytest.raises(ValueError):
cipher.encryptor()
def hkdf_derive_test(backend, algorithm, params):
hkdf = HKDF(
algorithm,
int(params["l"]),
salt=binascii.unhexlify(params["salt"]) or None,
info=binascii.unhexlify(params["info"]) or None,
backend=backend
)
okm = hkdf.derive(binascii.unhexlify(params["ikm"]))
assert okm == binascii.unhexlify(params["okm"])
def hkdf_extract_test(backend, algorithm, params):
hkdf = HKDF(
algorithm,
int(params["l"]),
salt=binascii.unhexlify(params["salt"]) or None,
info=binascii.unhexlify(params["info"]) or None,
backend=backend
)
prk = hkdf._extract(binascii.unhexlify(params["ikm"]))
assert prk == binascii.unhexlify(params["prk"])
def hkdf_expand_test(backend, algorithm, params):
hkdf = HKDF(
algorithm,
int(params["l"]),
salt=binascii.unhexlify(params["salt"]) or None,
info=binascii.unhexlify(params["info"]) or None,
backend=backend
)
okm = hkdf._expand(binascii.unhexlify(params["prk"]))
assert okm == binascii.unhexlify(params["okm"])
def generate_hkdf_test(param_loader, path, file_names, algorithm):
all_params = _load_all_params(path, file_names, param_loader)
all_tests = [hkdf_extract_test, hkdf_expand_test, hkdf_derive_test]
@pytest.mark.parametrize(
("params", "hkdf_test"),
itertools.product(all_params, all_tests)
)
def test_hkdf(self, backend, params, hkdf_test):
hkdf_test(backend, algorithm, params)
return test_hkdf
def generate_rsa_pss_test(param_loader, path, file_names, hash_name):
all_params = _load_all_params(path, file_names, param_loader)
all_params = [i for i in all_params if i["algorithm"] == hash_name]
@pytest.mark.parametrize("params", all_params)
def test_rsa_pss(self, backend, params):
rsa_pss_test(backend, params)
return test_rsa_pss
def rsa_pss_test(backend, params):
public_key = rsa.RSAPublicKey(
public_exponent=params["public_exponent"],
modulus=params["modulus"]
)
hash_cls = getattr(hashes, params["algorithm"].decode("utf8"))
verifier = public_key.verifier(
binascii.unhexlify(params["s"]),
padding.PSS(
mgf=padding.MGF1(
algorithm=hash_cls(),
salt_length=params["salt_length"]
)
),
hash_cls(),
backend
)
verifier.update(binascii.unhexlify(params["msg"]))
verifier.verify()
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