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329 lines
10 KiB
Python
329 lines
10 KiB
Python
import functools
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import hashlib
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import importlib
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import unittest
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from test.support.import_helper import import_module
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try:
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import _hashlib
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except ImportError:
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_hashlib = None
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try:
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import _hmac
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except ImportError:
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_hmac = None
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def requires_hashlib():
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return unittest.skipIf(_hashlib is None, "requires _hashlib")
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def requires_builtin_hmac():
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return unittest.skipIf(_hmac is None, "requires _hmac")
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def _missing_hash(digestname, implementation=None, *, exc=None):
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parts = ["missing", implementation, f"hash algorithm: {digestname!r}"]
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msg = " ".join(filter(None, parts))
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raise unittest.SkipTest(msg) from exc
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def _openssl_availabillity(digestname, *, usedforsecurity):
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try:
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_hashlib.new(digestname, usedforsecurity=usedforsecurity)
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except AttributeError:
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assert _hashlib is None
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_missing_hash(digestname, "OpenSSL")
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except ValueError as exc:
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_missing_hash(digestname, "OpenSSL", exc=exc)
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def _decorate_func_or_class(func_or_class, decorator_func):
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if not isinstance(func_or_class, type):
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return decorator_func(func_or_class)
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decorated_class = func_or_class
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setUpClass = decorated_class.__dict__.get('setUpClass')
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if setUpClass is None:
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def setUpClass(cls):
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super(decorated_class, cls).setUpClass()
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setUpClass.__qualname__ = decorated_class.__qualname__ + '.setUpClass'
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setUpClass.__module__ = decorated_class.__module__
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else:
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setUpClass = setUpClass.__func__
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setUpClass = classmethod(decorator_func(setUpClass))
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decorated_class.setUpClass = setUpClass
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return decorated_class
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def requires_hashdigest(digestname, openssl=None, usedforsecurity=True):
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"""Decorator raising SkipTest if a hashing algorithm is not available.
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The hashing algorithm may be missing, blocked by a strict crypto policy,
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or Python may be configured with `--with-builtin-hashlib-hashes=no`.
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If 'openssl' is True, then the decorator checks that OpenSSL provides
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the algorithm. Otherwise the check falls back to (optional) built-in
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HACL* implementations.
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The usedforsecurity flag is passed to the constructor but has no effect
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on HACL* implementations.
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Examples of exceptions being suppressed:
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ValueError: [digital envelope routines: EVP_DigestInit_ex] disabled for FIPS
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ValueError: unsupported hash type md4
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"""
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if openssl and _hashlib is not None:
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def test_availability():
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_hashlib.new(digestname, usedforsecurity=usedforsecurity)
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else:
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def test_availability():
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hashlib.new(digestname, usedforsecurity=usedforsecurity)
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def decorator_func(func):
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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try:
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test_availability()
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except ValueError as exc:
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_missing_hash(digestname, exc=exc)
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return func(*args, **kwargs)
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return wrapper
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def decorator(func_or_class):
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return _decorate_func_or_class(func_or_class, decorator_func)
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return decorator
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def requires_openssl_hashdigest(digestname, *, usedforsecurity=True):
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"""Decorator raising SkipTest if an OpenSSL hashing algorithm is missing.
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The hashing algorithm may be missing or blocked by a strict crypto policy.
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"""
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def decorator_func(func):
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@requires_hashlib() # avoid checking at each call
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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_openssl_availabillity(digestname, usedforsecurity=usedforsecurity)
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return func(*args, **kwargs)
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return wrapper
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def decorator(func_or_class):
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return _decorate_func_or_class(func_or_class, decorator_func)
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return decorator
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def find_openssl_hashdigest_constructor(digestname, *, usedforsecurity=True):
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"""Find the OpenSSL hash function constructor by its name."""
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assert isinstance(digestname, str), digestname
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_openssl_availabillity(digestname, usedforsecurity=usedforsecurity)
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# This returns a function of the form _hashlib.openssl_<name> and
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# not a lambda function as it is rejected by _hashlib.hmac_new().
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return getattr(_hashlib, f"openssl_{digestname}")
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def requires_builtin_hashdigest(
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module_name, digestname, *, usedforsecurity=True
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):
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"""Decorator raising SkipTest if a HACL* hashing algorithm is missing.
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- The *module_name* is the C extension module name based on HACL*.
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- The *digestname* is one of its member, e.g., 'md5'.
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"""
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def decorator_func(func):
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@functools.wraps(func)
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def wrapper(*args, **kwargs):
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module = import_module(module_name)
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try:
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getattr(module, digestname)
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except AttributeError:
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fullname = f'{module_name}.{digestname}'
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_missing_hash(fullname, implementation="HACL")
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return func(*args, **kwargs)
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return wrapper
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def decorator(func_or_class):
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return _decorate_func_or_class(func_or_class, decorator_func)
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return decorator
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def find_builtin_hashdigest_constructor(
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module_name, digestname, *, usedforsecurity=True
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):
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"""Find the HACL* hash function constructor.
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- The *module_name* is the C extension module name based on HACL*.
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- The *digestname* is one of its member, e.g., 'md5'.
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"""
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module = import_module(module_name)
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try:
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constructor = getattr(module, digestname)
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constructor(b'', usedforsecurity=usedforsecurity)
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except (AttributeError, TypeError, ValueError):
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_missing_hash(f'{module_name}.{digestname}', implementation="HACL")
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return constructor
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class HashFunctionsTrait:
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"""Mixin trait class containing hash functions.
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This class is assumed to have all unitest.TestCase methods but should
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not directly inherit from it to prevent the test suite being run on it.
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Subclasses should implement the hash functions by returning an object
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that can be recognized as a valid digestmod parameter for both hashlib
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and HMAC. In particular, it cannot be a lambda function as it will not
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be recognized by hashlib (it will still be accepted by the pure Python
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implementation of HMAC).
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"""
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ALGORITHMS = [
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'md5', 'sha1',
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'sha224', 'sha256', 'sha384', 'sha512',
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'sha3_224', 'sha3_256', 'sha3_384', 'sha3_512',
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]
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# Default 'usedforsecurity' to use when looking up a hash function.
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usedforsecurity = True
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def _find_constructor(self, name):
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# By default, a missing algorithm skips the test that uses it.
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self.assertIn(name, self.ALGORITHMS)
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self.skipTest(f"missing hash function: {name}")
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@property
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def md5(self):
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return self._find_constructor("md5")
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@property
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def sha1(self):
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return self._find_constructor("sha1")
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@property
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def sha224(self):
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return self._find_constructor("sha224")
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@property
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def sha256(self):
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return self._find_constructor("sha256")
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@property
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def sha384(self):
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return self._find_constructor("sha384")
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@property
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def sha512(self):
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return self._find_constructor("sha512")
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@property
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def sha3_224(self):
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return self._find_constructor("sha3_224")
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@property
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def sha3_256(self):
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return self._find_constructor("sha3_256")
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@property
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def sha3_384(self):
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return self._find_constructor("sha3_384")
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@property
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def sha3_512(self):
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return self._find_constructor("sha3_512")
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class NamedHashFunctionsTrait(HashFunctionsTrait):
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"""Trait containing named hash functions.
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Hash functions are available if and only if they are available in hashlib.
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"""
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def _find_constructor(self, name):
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self.assertIn(name, self.ALGORITHMS)
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return name
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class OpenSSLHashFunctionsTrait(HashFunctionsTrait):
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"""Trait containing OpenSSL hash functions.
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Hash functions are available if and only if they are available in _hashlib.
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"""
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def _find_constructor(self, name):
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self.assertIn(name, self.ALGORITHMS)
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return find_openssl_hashdigest_constructor(
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name, usedforsecurity=self.usedforsecurity
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)
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class BuiltinHashFunctionsTrait(HashFunctionsTrait):
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"""Trait containing HACL* hash functions.
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Hash functions are available if and only if they are available in C.
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In particular, HACL* HMAC-MD5 may be available even though HACL* md5
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is not since the former is unconditionally built.
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"""
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def _find_constructor_in(self, module, name):
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self.assertIn(name, self.ALGORITHMS)
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return find_builtin_hashdigest_constructor(module, name)
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@property
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def md5(self):
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return self._find_constructor_in("_md5", "md5")
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@property
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def sha1(self):
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return self._find_constructor_in("_sha1", "sha1")
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@property
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def sha224(self):
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return self._find_constructor_in("_sha2", "sha224")
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@property
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def sha256(self):
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return self._find_constructor_in("_sha2", "sha256")
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@property
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def sha384(self):
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return self._find_constructor_in("_sha2", "sha384")
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@property
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def sha512(self):
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return self._find_constructor_in("_sha2", "sha512")
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@property
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def sha3_224(self):
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return self._find_constructor_in("_sha3", "sha3_224")
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@property
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def sha3_256(self):
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return self._find_constructor_in("_sha3","sha3_256")
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@property
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def sha3_384(self):
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return self._find_constructor_in("_sha3","sha3_384")
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@property
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def sha3_512(self):
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return self._find_constructor_in("_sha3","sha3_512")
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def find_gil_minsize(modules_names, default=2048):
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"""Get the largest GIL_MINSIZE value for the given cryptographic modules.
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The valid module names are the following:
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- _hashlib
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- _md5, _sha1, _sha2, _sha3, _blake2
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- _hmac
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"""
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sizes = []
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for module_name in modules_names:
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try:
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module = importlib.import_module(module_name)
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except ImportError:
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continue
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sizes.append(getattr(module, '_GIL_MINSIZE', default))
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return max(sizes, default=default)
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