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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.exceptions import (
AlreadyFinalized,
InvalidSignature,
_Reasons,
)
from cryptography.hazmat.primitives import hashes, hmac
from ...doubles import DummyHashAlgorithm
from ...utils import raises_unsupported_algorithm
from .utils import generate_base_hmac_test
@pytest.mark.supported(
only_if=lambda backend: backend.hmac_supported(hashes.MD5()),
skip_message="Does not support MD5",
)
class TestHMACCopy:
test_copy = generate_base_hmac_test(
hashes.MD5(),
)
class TestHMAC:
def test_hmac_reject_unicode(self, backend):
h = hmac.HMAC(b"mykey", hashes.SHA1(), backend=backend)
with pytest.raises(TypeError):
h.update("\u00fc") # type: ignore[arg-type]
def test_hmac_algorithm_instance(self, backend):
with pytest.raises(TypeError):
hmac.HMAC(
b"key",
hashes.SHA1, # type: ignore[arg-type]
backend=backend,
)
def test_raises_after_finalize(self, backend):
h = hmac.HMAC(b"key", hashes.SHA1(), backend=backend)
h.finalize()
with pytest.raises(AlreadyFinalized):
h.update(b"foo")
with pytest.raises(AlreadyFinalized):
h.copy()
with pytest.raises(AlreadyFinalized):
h.finalize()
def test_verify(self, backend):
h = hmac.HMAC(b"", hashes.SHA1(), backend=backend)
digest = h.finalize()
h = hmac.HMAC(b"", hashes.SHA1(), backend=backend)
h.verify(digest)
with pytest.raises(AlreadyFinalized):
h.verify(b"")
def test_invalid_verify(self, backend):
h = hmac.HMAC(b"", hashes.SHA1(), backend=backend)
with pytest.raises(InvalidSignature):
h.verify(b"")
with pytest.raises(AlreadyFinalized):
h.verify(b"")
def test_verify_reject_unicode(self, backend):
h = hmac.HMAC(b"", hashes.SHA1(), backend=backend)
with pytest.raises(TypeError):
h.verify("") # type: ignore[arg-type]
def test_unsupported_hash(self, backend):
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
hmac.HMAC(b"key", DummyHashAlgorithm(), backend)
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
hmac.HMAC(b"key", hashes.SHAKE256(digest_size=256), backend)
def test_buffer_protocol(self, backend):
key = bytearray(b"2b7e151628aed2a6abf7158809cf4f3c")
h = hmac.HMAC(key, hashes.SHA256(), backend)
h.update(bytearray(b"6bc1bee22e409f96e93d7e117393172a"))
assert h.finalize() == binascii.unhexlify(
b"a1bf7169c56a501c6585190ff4f07cad6e492a3ee187c0372614fb444b9fc3f0"
)
def test_algorithm(self):
alg = hashes.SHA256()
h = hmac.HMAC(b"123456", alg)
assert h.algorithm is alg
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