Function _openssl_hash

Lib/test/support/hashlib_helper.py:665–687

Check availability of _hashlib.openssl_ (**kwargs). The constructor function is returned (without binding **kwargs), or SkipTest is raised if none exists.

(digestname, /, **kwargs)

def _openssl_hash(digestname, /, **kwargs):
    """Check availability of _hashlib.openssl_<digestname>(**kwargs).

    The constructor function is returned (without binding **kwargs),
    or SkipTest is raised if none exists.
    """
    assert isinstance(digestname, str), digestname
    method_name = f"openssl_{digestname}"
    fullname = f"_hashlib.{method_name}"
    try:
        # re-import '_hashlib' in case it was mocked
        _hashlib = importlib.import_module("_hashlib")
    except ImportError as exc:
        raise SkipNoHash(fullname, "openssl") from exc
    try:
        constructor = getattr(_hashlib, method_name)
    except AttributeError as exc:
        raise SkipNoHash(fullname, "openssl") from exc
    try:
        constructor(**kwargs)
    except ValueError as exc:
        raise SkipNoHash(fullname, "openssl") from exc
    return constructor


def requires_hashdigest(digestname, openssl=None, *, usedforsecurity=True):