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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 os
import pytest
from cryptography.hazmat.backends.interfaces import CipherBackend
from cryptography.hazmat.primitives import keywrap
from cryptography.hazmat.primitives.ciphers import algorithms, modes
from .utils import _load_all_params
from ...utils import load_nist_vectors
@pytest.mark.requires_backend_interface(interface=CipherBackend)
class TestAESKeyWrap(object):
@pytest.mark.parametrize(
"params",
_load_all_params(
os.path.join("keywrap", "kwtestvectors"),
["KW_AE_128.txt", "KW_AE_192.txt", "KW_AE_256.txt"],
load_nist_vectors
)
)
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
algorithms.AES("\x00" * 16), modes.ECB()
),
skip_message="Does not support AES key wrap (RFC 3394) because AES-ECB"
" is unsupported",
)
def test_wrap(self, backend, params):
wrapping_key = binascii.unhexlify(params["k"])
key_to_wrap = binascii.unhexlify(params["p"])
wrapped_key = keywrap.aes_key_wrap(wrapping_key, key_to_wrap, backend)
assert params["c"] == binascii.hexlify(wrapped_key)
@pytest.mark.parametrize(
"params",
_load_all_params(
os.path.join("keywrap", "kwtestvectors"),
["KW_AD_128.txt", "KW_AD_192.txt", "KW_AD_256.txt"],
load_nist_vectors
)
)
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
algorithms.AES("\x00" * 16), modes.ECB()
),
skip_message="Does not support AES key wrap (RFC 3394) because AES-ECB"
" is unsupported",
)
def test_unwrap(self, backend, params):
wrapping_key = binascii.unhexlify(params["k"])
wrapped_key = binascii.unhexlify(params["c"])
if params.get("fail") is True:
with pytest.raises(keywrap.InvalidUnwrap):
keywrap.aes_key_unwrap(wrapping_key, wrapped_key, backend)
else:
unwrapped_key = keywrap.aes_key_unwrap(
wrapping_key, wrapped_key, backend
)
assert params["p"] == binascii.hexlify(unwrapped_key)
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
algorithms.AES("\x00" * 16), modes.ECB()
),
skip_message="Does not support AES key wrap (RFC 3394) because AES-ECB"
" is unsupported",
)
def test_wrap_invalid_key_length(self, backend):
# The wrapping key must be of length [16, 24, 32]
with pytest.raises(ValueError):
keywrap.aes_key_wrap(b"badkey", b"sixteen_byte_key", backend)
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
algorithms.AES("\x00" * 16), modes.ECB()
),
skip_message="Does not support AES key wrap (RFC 3394) because AES-ECB"
" is unsupported",
)
def test_unwrap_invalid_key_length(self, backend):
with pytest.raises(ValueError):
keywrap.aes_key_unwrap(b"badkey", b"\x00" * 24, backend)
@pytest.mark.supported(
only_if=lambda backend: backend.cipher_supported(
algorithms.AES("\x00" * 16), modes.ECB()
),
skip_message="Does not support AES key wrap (RFC 3394) because AES-ECB"
" is unsupported",
)
def test_wrap_invalid_key_to_wrap_length(self, backend):
# Keys to wrap must be at least 16 bytes long
with pytest.raises(ValueError):
keywrap.aes_key_wrap(b"sixteen_byte_key", b"\x00" * 15, backend)
# Keys to wrap must be a multiple of 8 bytes
with pytest.raises(ValueError):
keywrap.aes_key_wrap(b"sixteen_byte_key", b"\x00" * 23, backend)
def test_unwrap_invalid_wrapped_key_length(self, backend):
# Keys to unwrap must be at least 24 bytes
with pytest.raises(ValueError):
keywrap.aes_key_unwrap(b"sixteen_byte_key", b"\x00" * 16, backend)
# Keys to unwrap must be a multiple of 8 bytes
with pytest.raises(ValueError):
keywrap.aes_key_unwrap(b"sixteen_byte_key", b"\x00" * 27, backend)
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