Here is the implementation of the second option:

def requires_hashdigest(digestname, openssl=None, usedforsecurity=True):
    def decorator(func):
        if isinstance(func, type):
            setUpClass = func.__dict__.get('setUpClass')
            if setUpClass is None:
                def setUpClass(cls):
                    super(func, cls).setUpClass()
                setUpClass.__qualname__ = func.__qualname__ + '.setUpClass'
                setUpClass.__module__ = func.__module__
            else:
                setUpClass = setUpClass.__func__
            setUpClass = classmethod(decorator(setUpClass))
            func.setUpClass = setUpClass
            return func
        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            try:
                if openssl and _hashlib is not None:
                    _hashlib.new(digestname, usedforsecurity=usedforsecurity)
                else:
                    hashlib.new(digestname, usedforsecurity=usedforsecurity)
            except ValueError:
                raise unittest.SkipTest(
                    f"hash digest '{digestname}' is not available."
                )
            return func(*args, **kwargs)
        return wrapper
    return decorator