Function __get_openssl_constructor

Lib/hashlib.py:132–159

(name)

def __get_openssl_constructor(name):
    # This function is only used until the module has been initialized.
    assert isinstance(name, str), "invalid call to __get_openssl_constructor()"
    if name in __block_openssl_constructor:
        # Prefer our builtin blake2 implementation.
        return __get_builtin_constructor(name)
    try:
        # Fetch the OpenSSL hash function if it exists,
        # independently of the context security policy.
        f = getattr(_hashlib, 'openssl_' + name)
        # Check if the context security policy blocks the digest or not
        # by allowing the C module to raise a ValueError. The function
        # will be defined but the hash will not be available at runtime.
        #
        # We use "usedforsecurity=False" to prevent falling back to the
        # built-in function in case the security policy does not allow it.
        #
        # Note that this only affects the explicit named constructors,
        # and not the algorithms exposed through hashlib.new() which
        # can still be resolved to a built-in function even if the
        # current security policy does not allow it.
        #
        # See https://github.com/python/cpython/issues/84872.
        f(usedforsecurity=False)
        # Use the C function directly (very fast)
        return f
    except (AttributeError, ValueError):
        return __get_builtin_constructor(name)


def __py_new(name, *args, **kwargs):