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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.
import binascii
import pytest
from cryptography.hazmat.primitives import keywrap
from .utils import wycheproof_tests
@wycheproof_tests("aes_kwp_test.json")
def test_keywrap_with_padding(backend, wycheproof):
wrapping_key = binascii.unhexlify(wycheproof.testcase["key"])
key_to_wrap = binascii.unhexlify(wycheproof.testcase["msg"])
expected = binascii.unhexlify(wycheproof.testcase["ct"])
result = keywrap.aes_key_wrap_with_padding(
wrapping_key, key_to_wrap, backend
)
if wycheproof.valid or wycheproof.acceptable:
assert result == expected
if wycheproof.valid or (wycheproof.acceptable and not len(expected) < 16):
result = keywrap.aes_key_unwrap_with_padding(
wrapping_key, expected, backend
)
assert result == key_to_wrap
else:
with pytest.raises(keywrap.InvalidUnwrap):
keywrap.aes_key_unwrap_with_padding(
wrapping_key, expected, backend
)
@wycheproof_tests("aes_wrap_test.json")
def test_keywrap(backend, wycheproof):
wrapping_key = binascii.unhexlify(wycheproof.testcase["key"])
key_to_wrap = binascii.unhexlify(wycheproof.testcase["msg"])
expected = binascii.unhexlify(wycheproof.testcase["ct"])
if wycheproof.invalid or (
wycheproof.acceptable and wycheproof.has_flag("ShortKey")
):
if not wycheproof.has_flag(
"InvalidWrappingSize"
) and not wycheproof.has_flag("ModifiedIv"):
with pytest.raises(ValueError):
keywrap.aes_key_wrap(wrapping_key, key_to_wrap, backend)
with pytest.raises(keywrap.InvalidUnwrap):
keywrap.aes_key_unwrap(wrapping_key, expected, backend)
else:
result = keywrap.aes_key_wrap(wrapping_key, key_to_wrap, backend)
assert result == expected
result = keywrap.aes_key_unwrap(wrapping_key, expected, backend)
assert result == key_to_wrap
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