Parses the given line of text to find the names for the host,
        the type of key, and the key data. The line is expected to be in the
        format used by the OpenSSH known_hosts file.

        Lines are expected to not have leading or trailing whitespace.
        We don't bother to check for comments or empty lines.  All of
        that should be taken care of before sending the line to us.

        :param str line: a line from an OpenSSH known_hosts file

def from_line(cls, line, lineno=None):
        """
        Parses the given line of text to find the names for the host,
        the type of key, and the key data. The line is expected to be in the
        format used by the OpenSSH known_hosts file.

        Lines are expected to not have leading or trailing whitespace.
        We don't bother to check for comments or empty lines.  All of
        that should be taken care of before sending the line to us.

        :param str line: a line from an OpenSSH known_hosts file
        """
        log = get_logger("paramiko.hostkeys")
        fields = line.split(" ")
        if len(fields) < 3:
            # Bad number of fields
            msg = "Not enough fields found in known_hosts in line {} ({!r})"
            log.info(msg.format(lineno, line))
            return None
        fields = fields[:3]

        names, keytype, key = fields
        names = names.split(",")

        # Decide what kind of key we're looking at and create an object
        # to hold it accordingly.
        try:
            key = b(key)
            if keytype == "ssh-rsa":
                key = RSAKey(data=decodebytes(key))
            elif keytype == "ssh-dss":
                key = DSSKey(data=decodebytes(key))
            elif keytype in ECDSAKey.supported_key_format_identifiers():
                key = ECDSAKey(data=decodebytes(key), validate_point=False)
            elif keytype == "ssh-ed25519":
                key = Ed25519Key(data=decodebytes(key))
            else:
                log.info("Unable to handle key of type {}".format(keytype))
                return None

        except binascii.Error as e:
            raise InvalidHostKey(line, e)

        return cls(names, key)