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import binascii
import os
import pytest
from cryptography.hazmat.bindings import _ALL_BACKENDS
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives import hmac
from cryptography.hazmat.primitives.ciphers import Cipher
from ...utils import load_vectors_from_file
def generate_encrypt_test(param_loader, path, file_names, cipher_factory,
mode_factory, only_if=lambda backend: True,
skip_message=None):
def test_encryption(self):
for backend in _ALL_BACKENDS:
for file_name in file_names:
for params in load_vectors_from_file(
os.path.join(path, file_name),
param_loader
):
yield (
encrypt_test,
backend,
cipher_factory,
mode_factory,
params,
only_if,
skip_message
)
return test_encryption
def encrypt_test(backend, cipher_factory, mode_factory, params, only_if,
skip_message):
if not only_if(backend):
pytest.skip(skip_message)
plaintext = params.pop("plaintext")
ciphertext = params.pop("ciphertext")
cipher = Cipher(
cipher_factory(**params),
mode_factory(**params),
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_stream_encryption_test(param_loader, path, file_names,
cipher_factory, only_if=None,
skip_message=None):
def test_stream_encryption(self):
for backend in _ALL_BACKENDS:
for file_name in file_names:
for params in load_vectors_from_file(
os.path.join(path, file_name),
param_loader
):
yield (
stream_encryption_test,
backend,
cipher_factory,
params,
only_if,
skip_message
)
return test_stream_encryption
def stream_encryption_test(backend, cipher_factory, params, only_if,
skip_message):
if not only_if(backend):
pytest.skip(skip_message)
plaintext = params.pop("plaintext")
ciphertext = params.pop("ciphertext")
offset = params.pop("offset")
cipher = Cipher(cipher_factory(**params), None, 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,
only_if=None, skip_message=None):
def test_hash(self):
for backend in _ALL_BACKENDS:
for file_name in file_names:
for params in load_vectors_from_file(
os.path.join(path, file_name),
param_loader
):
yield (
hash_test,
backend,
hash_cls,
params,
only_if,
skip_message
)
return test_hash
def hash_test(backend, algorithm, params, only_if, skip_message):
if only_if is not None and not only_if(backend):
pytest.skip(skip_message)
msg = params[0]
md = params[1]
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,
only_if=None, skip_message=None):
def test_base_hash(self):
for backend in _ALL_BACKENDS:
yield (
base_hash_test,
backend,
algorithm,
digest_size,
block_size,
only_if,
skip_message,
)
return test_base_hash
def base_hash_test(backend, algorithm, digest_size, block_size, only_if,
skip_message):
if only_if is not None and not only_if(backend):
pytest.skip(skip_message)
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, only_if=None,
skip_message=None):
def test_long_string_hash(self):
for backend in _ALL_BACKENDS:
yield(
long_string_hash_test,
backend,
hash_factory,
md,
only_if,
skip_message
)
return test_long_string_hash
def long_string_hash_test(backend, algorithm, md, only_if, skip_message):
if only_if is not None and not only_if(backend):
pytest.skip(skip_message)
m = hashes.Hash(algorithm, backend=backend)
m.update(b"a" * 1000000)
assert m.finalize() == binascii.unhexlify(md.lower().encode("ascii"))
def generate_hmac_test(param_loader, path, file_names, algorithm,
only_if=None, skip_message=None):
def test_hmac(self):
for backend in _ALL_BACKENDS:
for file_name in file_names:
for params in load_vectors_from_file(
os.path.join(path, file_name),
param_loader
):
yield (
hmac_test,
backend,
algorithm,
params,
only_if,
skip_message
)
return test_hmac
def hmac_test(backend, algorithm, params, only_if, skip_message):
if only_if is not None and not only_if(backend):
pytest.skip(skip_message)
msg = params[0]
md = params[1]
key = params[2]
h = hmac.HMAC(binascii.unhexlify(key), algorithm)
h.update(binascii.unhexlify(msg))
assert h.finalize() == binascii.unhexlify(md.encode("ascii"))
def generate_base_hmac_test(hash_cls, only_if=None, skip_message=None):
def test_base_hmac(self):
for backend in _ALL_BACKENDS:
yield (
base_hmac_test,
backend,
hash_cls,
only_if,
skip_message,
)
return test_base_hmac
def base_hmac_test(backend, algorithm, only_if, skip_message):
if only_if is not None and not only_if(backend):
pytest.skip(skip_message)
key = b"ab"
h = hmac.HMAC(binascii.unhexlify(key), algorithm)
h_copy = h.copy()
assert h != h_copy
assert h._ctx != h_copy._ctx
|
