def fromString(cls, string):
        """
        Load a hashed entry from a string representing a line in a known_hosts
        file.

        @param string: A complete single line from a I{known_hosts} file,
            formatted as defined by OpenSSH.
        @type string: L{bytes}

        @raise DecodeError: if the key, the hostname, or the is not valid
            encoded as valid base64

        @raise InvalidEntry: if the entry does not have the right number of
            elements and is therefore invalid, or the host/hash portion contains
            more items than just the host and hash.

        @raise BadKeyError: if the key, once decoded from base64, is not
            actually an SSH key.

        @return: The newly created L{HashedEntry} instance, initialized with the
            information from C{string}.
        """
        stuff, keyType, key, comment = _extractCommon(string)
        saltAndHash = stuff[len(cls.MAGIC):].split(b"|")
        if len(saltAndHash) != 2:
            raise InvalidEntry()
        hostSalt, hostHash = saltAndHash
        self = cls(a2b_base64(hostSalt), a2b_base64(hostHash),
                   keyType, key, comment)
        return self

        Load a hashed entry from a string representing a line in a known_hosts
        file.

        @param string: A complete single line from a I{known_hosts} file,
            formatted as defined by OpenSSH.
        @type string: L{bytes}

        @raise DecodeError: if the key, the hostname, or the is not valid
            encoded as valid base64

        @raise InvalidEntry: if the entry does not have the right number of
            elements and is therefore invalid, or the host/hash portion contains
            more items than just the host and hash.

        @raise BadKeyError: if the key, once decoded from base64, is not
            actually an SSH key.

        @return: The newly created L{HashedEntry} instance, initialized with the
            information from C{string}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/client/knownhosts.py