Class OptionalAuth

scapy/contrib/bfd.py:66–109

class OptionalAuth(Packet):
    name = "Optional Auth"
    fields_desc = [
        ByteEnumField("auth_type", 1, _authentification_type),
        FieldLenField(
            "auth_len",
            None,
            fmt="B",
            length_of="auth_key",
            adjust=lambda pkt, x: x + 3 if pkt.auth_type <= 1 else x + 8,
        ),
        ByteField("auth_keyid", 1),
        ConditionalField(
            XByteField("reserved", 0),
            lambda pkt: pkt.auth_type > 1,
        ),
        ConditionalField(
            IntField("sequence_number", 0),
            lambda pkt: pkt.auth_type > 1,
        ),
        MultipleTypeField(
            [
                (
                    StrFixedLenField(
                        "auth_key", "", length_from=lambda pkt: pkt.auth_len
                    ),
                    lambda pkt: pkt.auth_type == 0,
                ),
                (
                    XNBytesField("auth_key", 0x5F4DCC3B5AA765D61D8327DEB882CF99, 16),
                    lambda pkt: pkt.auth_type == 2 or pkt.auth_type == 3,
                ),
                (
                    XNBytesField(
                        "auth_key", 0x5BAA61E4C9B93F3F0682250B6CF8331B7EE68FD8, 20
                    ),
                    lambda pkt: pkt.auth_type == 4 or pkt.auth_type == 5,
                ),
            ],
            StrFixedLenField(
                "auth_key", "password", length_from=lambda pkt: pkt.auth_len
            ),
        ),
    ]


class BFD(Packet):