Class Dot15d4AuxSecurityHeader

scapy/layers/dot15d4.py:195–222

class Dot15d4AuxSecurityHeader(Packet):
    name = "802.15.4 Auxiliary Security Header"
    fields_desc = [
        BitField("sec_sc_reserved", 0, 3),
        # Key Identifier Mode
        # 0: Key is determined implicitly from the originator and recipient(s) of the frame  # noqa: E501
        # 1: Key is determined explicitly from the the 1-octet Key Index subfield of the Key Identifier field  # noqa: E501
        # 2: Key is determined explicitly from the 4-octet Key Source and the 1-octet Key Index  # noqa: E501
        # 3: Key is determined explicitly from the 8-octet Key Source and the 1-octet Key Index  # noqa: E501
        BitEnumField("sec_sc_keyidmode", 0, 2, {
            0: "Implicit", 1: "1oKeyIndex", 2: "4o-KeySource-1oKeyIndex", 3: "8o-KeySource-1oKeyIndex"}  # noqa: E501
        ),
        BitEnumField("sec_sc_seclevel", 0, 3, {0: "None", 1: "MIC-32", 2: "MIC-64", 3: "MIC-128", 4: "ENC", 5: "ENC-MIC-32", 6: "ENC-MIC-64", 7: "ENC-MIC-128"}),  # noqa: E501
        XLEIntField("sec_framecounter", 0x00000000),  # 4 octets
        # Key Identifier (variable length): identifies the key that is used for cryptographic protection  # noqa: E501
        # Key Source : length of sec_keyid_keysource varies btwn 0, 4, and 8 bytes depending on sec_sc_keyidmode  # noqa: E501
        MultipleTypeField([
            # 4 octets when sec_sc_keyidmode == 2
            (XLEIntField("sec_keyid_keysource", 0x00000000),
                lambda pkt: pkt.getfieldval("sec_sc_keyidmode") == 2),
            # 8 octets when sec_sc_keyidmode == 3
            (LELongField("sec_keyid_keysource", 0x0000000000000000),
                lambda pkt: pkt.getfieldval("sec_sc_keyidmode") == 3),
        ], StrFixedLenField("sec_keyid_keysource", "", length=0)),
        # Key Index (1 octet): allows unique identification of different keys with the same originator  # noqa: E501
        ConditionalField(XByteField("sec_keyid_keyindex", 0xFF),
                         lambda pkt: pkt.getfieldval("sec_sc_keyidmode") != 0),
    ]


class Dot15d4Data(Packet):