__init__.py 文件源码

def safe_crypt(secret, hash):
            if isinstance(secret, bytes):
                # Python 3's crypt() only accepts unicode, which is then
                # encoding using utf-8 before passing to the C-level crypt().
                # so we have to decode the secret.
                orig = secret
                try:
                    secret = secret.decode("utf-8")
                except UnicodeDecodeError:
                    return None
                assert secret.encode("utf-8") == orig, \
                            "utf-8 spec says this can't happen!"
            if _NULL in secret:
                raise ValueError("null character in secret")
            if isinstance(hash, bytes):
                hash = hash.decode("ascii")
            result = _crypt(secret, hash)
            if not result or result[0] in _invalid_prefixes:
                return None
            return result