# 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 os
import struct
import pytest
from cryptography.hazmat.backends.interfaces import CipherBackend
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms
from .utils import _load_all_params
from ...utils import load_nist_vectors
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
algorithms.ChaCha20(b"\x00" * 32, b"0" * 16), None
),
skip_message="Does not support ChaCha20",
)
@pytest.mark.requires_backend_interface(interface=CipherBackend)
class TestChaCha20(object):
@pytest.mark.parametrize(
"vector",
_load_all_params(
os.path.join("ciphers", "ChaCha20"),
["rfc7539.txt"],
load_nist_vectors
)
)
def test_vectors(self, vector, backend):
key = binascii.unhexlify(vector["key"])
nonce = binascii.unhexlify(vector["nonce"])
ibc = struct.pack("diffstats
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