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# SPDX-License-Identifier: MIT
"""Unit tests for mbedtls.md."""
from __future__ import annotations
import pickle
from collections.abc import Collection
from typing import Any, Callable, Mapping, NamedTuple, cast
import pytest
from mbedtls import hashlib, hmac
from mbedtls._md import Hash
class Size(NamedTuple):
digest_size: int
block_size: int
SUPPORTED_SIZES: Mapping[str, Size] = {
"md2": Size(digest_size=16, block_size=16),
"md4": Size(digest_size=16, block_size=64),
"md5": Size(digest_size=16, block_size=64),
"sha1": Size(digest_size=20, block_size=64),
"sha224": Size(digest_size=28, block_size=64),
"sha256": Size(digest_size=32, block_size=64),
"sha384": Size(digest_size=48, block_size=128),
"sha512": Size(digest_size=64, block_size=128),
"ripemd160": Size(digest_size=20, block_size=64),
}
def test_algorithms() -> None:
assert isinstance(hashlib.algorithms_guaranteed, Collection)
assert hashlib.algorithms_guaranteed
assert isinstance(hashlib.algorithms_available, Collection)
assert hashlib.algorithms_available
assert frozenset(hashlib.algorithms_guaranteed).issubset(
hashlib.algorithms_available
)
def test_invalid_name_raises_TypeError() -> None:
with pytest.raises(TypeError):
Hash(42) # type: ignore[arg-type]
def test_unavailable_cipher_raises_ValueError() -> None:
with pytest.raises(ValueError):
Hash("unavailable")
class TestHash:
@pytest.fixture(params=tuple(hashlib.algorithms_available))
def algorithm_str(self, request: Any) -> str:
assert isinstance(request.param, str)
return request.param
@pytest.fixture
def algorithm(self, algorithm_str: str) -> hashlib.Algorithm:
return cast(hashlib.Algorithm, getattr(hashlib, algorithm_str))
@pytest.mark.parametrize("repr_", [repr, str], ids=lambda f: f.__name__)
def test_repr(
self, repr_: Callable[[object], str], algorithm: hashlib.Algorithm
) -> None:
assert isinstance(repr_(algorithm(b"")), str)
def test_pickle(self, algorithm: hashlib.Algorithm) -> None:
with pytest.raises(TypeError) as excinfo:
pickle.dumps(algorithm(b""))
assert str(excinfo.value).startswith("cannot pickle")
def test_accessors(
self, algorithm: hashlib.Algorithm, algorithm_str: str
) -> None:
obj = algorithm(b"")
assert obj.digest_size == SUPPORTED_SIZES[algorithm_str].digest_size
assert obj.block_size == SUPPORTED_SIZES[algorithm_str].block_size
def test_update(
self, algorithm: hashlib.Algorithm, randbytes: Callable[[int], bytes]
) -> None:
buffer = randbytes(512)
obj = algorithm(b"")
obj.update(buffer)
other = algorithm(buffer)
assert obj.digest() == other.digest()
assert obj.hexdigest() == other.hexdigest()
def test_new(
self,
algorithm: hashlib.Algorithm,
algorithm_str: str,
randbytes: Callable[[int], bytes],
) -> None:
buffer = randbytes(512)
obj = algorithm(buffer)
other = hashlib.new(algorithm_str, buffer)
assert obj.digest() == other.digest()
assert obj.hexdigest() == other.hexdigest()
def test_update_and_copy(
self, algorithm: hashlib.Algorithm, randbytes: Callable[[int], bytes]
) -> None:
buffer = randbytes(512)
obj = algorithm(buffer)
other = obj.copy()
assert obj.digest() == other.digest()
assert obj.hexdigest() == other.hexdigest()
def test_copy_and_update(
self, algorithm: hashlib.Algorithm, randbytes: Callable[[int], bytes]
) -> None:
buffer = randbytes(512)
obj = algorithm(buffer)
other = obj.copy()
obj.update(buffer)
other.update(buffer)
assert obj.digest() == other.digest()
assert obj.hexdigest() == other.hexdigest()
def test_copy_and_update_nothing(
self, algorithm: hashlib.Algorithm, randbytes: Callable[[int], bytes]
) -> None:
buffer = randbytes(512)
obj = algorithm(buffer)
other = obj.copy()
obj.update(b"")
assert obj.digest() == other.digest()
assert obj.hexdigest() == other.hexdigest()
class TestHmac:
@pytest.fixture(params=tuple(hmac.algorithms_available))
def algorithm_str(self, request: Any) -> str:
assert isinstance(request.param, str)
return request.param
@pytest.fixture
def algorithm(self, algorithm_str: str) -> hmac.Algorithm:
return cast(hmac.Algorithm, getattr(hmac, algorithm_str))
@pytest.mark.parametrize("repr_", [repr, str], ids=lambda f: f.__name__)
def test_repr(
self, repr_: Callable[[object], str], algorithm: hmac.Algorithm
) -> None:
assert isinstance(repr_(algorithm(b"")), str)
def test_pickle(self, algorithm: hmac.Algorithm) -> None:
with pytest.raises(TypeError) as excinfo:
pickle.dumps(algorithm(b""))
assert str(excinfo.value).startswith("cannot pickle")
def test_accessors(
self, algorithm: hmac.Algorithm, algorithm_str: str
) -> None:
obj = algorithm(b"")
assert obj.digest_size == SUPPORTED_SIZES[algorithm_str].digest_size
assert obj.block_size == SUPPORTED_SIZES[algorithm_str].block_size
def test_update(
self, algorithm: hmac.Algorithm, randbytes: Callable[[int], bytes]
) -> None:
key = b"key"
buffer = randbytes(512)
obj = algorithm(key, b"")
obj.update(buffer)
other = algorithm(key, buffer)
assert obj.digest() == other.digest()
assert obj.hexdigest() == other.hexdigest()
def test_new(
self,
algorithm: hmac.Algorithm,
algorithm_str: str,
randbytes: Callable[[int], bytes],
) -> None:
key = b"key"
buffer = randbytes(512)
obj = algorithm(key, buffer)
other = hmac.new(key, buffer, digestmod=algorithm_str)
assert obj.digest() == other.digest()
assert obj.hexdigest() == other.hexdigest()
def test_copy_and_update_nothing(
self, algorithm: hmac.Algorithm, randbytes: Callable[[int], bytes]
) -> None:
key = b"key"
buffer = randbytes(512)
obj = algorithm(key, buffer)
other = algorithm(key, buffer)
obj.update(b"")
assert obj.digest() == other.digest()
assert obj.hexdigest() == other.hexdigest()
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