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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 pytest
from cryptography.exceptions import (
AlreadyFinalized, InvalidKey, _Reasons
)
from cryptography.hazmat.backends.interfaces import HMACBackend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.kbkdf import (
CounterLocation, KBKDFHMAC, Mode
)
from ...doubles import DummyHashAlgorithm
from ...utils import raises_unsupported_algorithm
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestKBKDFHMAC(object):
def test_invalid_key(self, backend):
kdf = KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
key = kdf.derive(b"material")
kdf = KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
with pytest.raises(InvalidKey):
kdf.verify(b"material2", key)
def test_already_finalized(self, backend):
kdf = KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
kdf.derive(b'material')
with pytest.raises(AlreadyFinalized):
kdf.derive(b'material2')
kdf = KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
key = kdf.derive(b'material')
with pytest.raises(AlreadyFinalized):
kdf.verify(b'material', key)
kdf = KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
kdf.verify(b'material', key)
with pytest.raises(AlreadyFinalized):
kdf.verify(b"material", key)
def test_key_length(self, backend):
kdf = KBKDFHMAC(hashes.SHA1(), Mode.CounterMode, 85899345920, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
with pytest.raises(ValueError):
kdf.derive(b'material')
def test_rlen(self, backend):
with pytest.raises(ValueError):
KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 5, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
def test_r_type(self, backend):
with pytest.raises(TypeError):
KBKDFHMAC(hashes.SHA1(), Mode.CounterMode, 32, b'r', 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
def test_l_type(self, backend):
with pytest.raises(TypeError):
KBKDFHMAC(hashes.SHA1(), Mode.CounterMode, 32, 4, b'l',
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
def test_l(self, backend):
with pytest.raises(ValueError):
KBKDFHMAC(hashes.SHA1(), Mode.CounterMode, 32, 4, None,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
def test_unsupported_mode(self, backend):
with pytest.raises(TypeError):
KBKDFHMAC(hashes.SHA256(), None, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
def test_unsupported_location(self, backend):
with pytest.raises(TypeError):
KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
None, b'label', b'context', None,
backend=backend)
def test_unsupported_parameters(self, backend):
with pytest.raises(ValueError):
KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
b'fixed', backend=backend)
def test_unsupported_hash(self, backend):
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
KBKDFHMAC(object(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
def test_unsupported_algorithm(self, backend):
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
KBKDFHMAC(DummyHashAlgorithm(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
def test_invalid_backend(self, backend):
with raises_unsupported_algorithm(_Reasons.BACKEND_MISSING_INTERFACE):
KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=object())
def test_unicode_error_label(self, backend):
with pytest.raises(TypeError):
KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, u'label', b'context',
backend=backend)
def test_unicode_error_context(self, backend):
with pytest.raises(TypeError):
KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label', u'context',
None, backend=backend)
def test_unicode_error_key_material(self, backend):
with pytest.raises(TypeError):
kdf = KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 32, 4, 4,
CounterLocation.BeforeFixed, b'label',
b'context', None, backend=backend)
kdf.derive(u'material')
def test_buffer_protocol(self, backend):
kdf = KBKDFHMAC(hashes.SHA256(), Mode.CounterMode, 10, 4, 4,
CounterLocation.BeforeFixed, b'label', b'context',
None, backend=backend)
key = kdf.derive(bytearray(b"material"))
assert key == b'\xb7\x01\x05\x98\xf5\x1a\x12L\xc7.'
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