Function _block_builtin_hmac_constructor

Lib/test/support/hashlib_helper.py:1001–1014

Block explicit HACL* HMAC constructors.

(name)

def _block_builtin_hmac_constructor(name):
    """Block explicit HACL* HMAC constructors."""
    info = get_hmac_item_info(name)
    assert info.module_name is None or info.module_name == "_hmac", info
    if (wrapped := info.import_member()) is None:
        # function shouldn't exist for this implementation
        return contextlib.nullcontext()

    @functools.wraps(wrapped)
    def wrapper(key, obj):
        raise ValueError(f"blocked hash name: {name}")

    _ensure_wrapper_signature(wrapper, wrapped)
    return unittest.mock.patch(info.fullname, wrapper)


@contextlib.contextmanager