mirror of https://github.com/python/cpython
52 lines
1.9 KiB
Python
52 lines
1.9 KiB
Python
import functools
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import hashlib
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import unittest
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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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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 could be missing or blocked by a strict crypto
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policy.
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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 built-in
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implementations. The usedforsecurity flag is passed to the constructor.
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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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def decorator(func_or_class):
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if isinstance(func_or_class, type):
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setUpClass = func_or_class.__dict__.get('setUpClass')
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if setUpClass is None:
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def setUpClass(cls):
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super(func_or_class, cls).setUpClass()
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setUpClass.__qualname__ = func_or_class.__qualname__ + '.setUpClass'
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setUpClass.__module__ = func_or_class.__module__
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else:
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setUpClass = setUpClass.__func__
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setUpClass = classmethod(decorator(setUpClass))
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func_or_class.setUpClass = setUpClass
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return func_or_class
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@functools.wraps(func_or_class)
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def wrapper(*args, **kwargs):
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try:
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if openssl and _hashlib is not None:
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_hashlib.new(digestname, usedforsecurity=usedforsecurity)
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else:
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hashlib.new(digestname, usedforsecurity=usedforsecurity)
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except ValueError:
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raise unittest.SkipTest(
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f"hash digest '{digestname}' is not available."
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)
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return func_or_class(*args, **kwargs)
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return wrapper
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return decorator
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