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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 import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from ...doubles import DummyHashAlgorithm
from ...utils import raises_unsupported_algorithm
class TestPBKDF2HMAC(object):
def test_already_finalized(self):
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, default_backend())
kdf.derive(b"password")
with pytest.raises(AlreadyFinalized):
kdf.derive(b"password2")
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, default_backend())
key = kdf.derive(b"password")
with pytest.raises(AlreadyFinalized):
kdf.verify(b"password", key)
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, default_backend())
kdf.verify(b"password", key)
with pytest.raises(AlreadyFinalized):
kdf.verify(b"password", key)
def test_unsupported_algorithm(self):
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
PBKDF2HMAC(
DummyHashAlgorithm(), 20, b"salt", 10, default_backend()
)
def test_invalid_key(self):
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, default_backend())
key = kdf.derive(b"password")
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, default_backend())
with pytest.raises(InvalidKey):
kdf.verify(b"password2", key)
def test_unicode_error_with_salt(self):
with pytest.raises(TypeError):
PBKDF2HMAC(hashes.SHA1(), 20, u"salt", 10, default_backend())
def test_unicode_error_with_key_material(self):
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, default_backend())
with pytest.raises(TypeError):
kdf.derive(u"unicode here")
def test_invalid_backend():
pretend_backend = object()
with raises_unsupported_algorithm(_Reasons.BACKEND_MISSING_INTERFACE):
PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, pretend_backend)
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