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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 pytest
from cryptography.exceptions import AlreadyFinalized, InvalidKey, _Reasons
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:
def test_already_finalized(self, backend):
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, backend)
kdf.derive(b"password")
with pytest.raises(AlreadyFinalized):
kdf.derive(b"password2")
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, backend)
key = kdf.derive(b"password")
with pytest.raises(AlreadyFinalized):
kdf.verify(b"password", key)
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, backend)
kdf.verify(b"password", key)
with pytest.raises(AlreadyFinalized):
kdf.verify(b"password", key)
def test_unsupported_algorithm(self, backend):
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
PBKDF2HMAC(DummyHashAlgorithm(), 20, b"salt", 10, backend)
def test_invalid_key(self, backend):
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, backend)
key = kdf.derive(b"password")
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, backend)
with pytest.raises(InvalidKey):
kdf.verify(b"password2", key)
def test_unicode_error_with_salt(self, backend):
with pytest.raises(TypeError):
PBKDF2HMAC(
hashes.SHA1(),
20,
"salt", # type: ignore[arg-type]
10,
backend,
)
def test_unicode_error_with_key_material(self, backend):
kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, backend)
with pytest.raises(TypeError):
kdf.derive("unicode here") # type: ignore[arg-type]
def test_buffer_protocol(self, backend):
kdf = PBKDF2HMAC(hashes.SHA1(), 10, b"salt", 10, backend)
data = bytearray(b"data")
assert kdf.derive(data) == b"\xe9n\xaa\x81\xbbt\xa4\xf6\x08\xce"
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