_mpdu.py 文件源码

def _iesubelfte_(s,sid):
    """ :returns: parsed opt subelement of FTE element """
    ret = s
    if sid == std.EID_FTE_RSRV: pass
    elif sid == std.EID_FTE_PMK_R1:
        # a 6-octed key
        ret = {'r1kh-id':struct.unpack_from('=Q',s+'\x00\x00')[0]}
    elif sid == std.EID_FTE_GTK:
        # Std Fig. 8-237 Key Info|Key Len|RSC|Wrapped Key
        #                       2|      1|  8|      24-40
        ki,kl,r = struct.unpack_from('=HBQ',s)
        ret = {'key-info':{'key-id':bits.leastx(2,ki),
                           'rsrv':bits.mostx(2,ki)},
               'key-leng':kl,
               'rsc':r,
               'wrapped-key':binascii.hexlify(s[struct.calcsize('=HBQ'):])}
    elif sid == std.EID_FTE_PMK_R0:
        # variable length 1-48 octets
        ret = {'r0kh-id':binascii.hexlify(s)}
    elif sid == std.EID_FTE_IGTK:
        # Std Fig 8-239 Key ID|IPN|Key Length|Wrapped Key
        #                    2|  6|         1|         24
        ki = struct.unpack_from('=H',s)[0]
        ipn = struct.unpack_from('=Q',s[2:8]+'\x00\x00')[0]
        kl = struct.unpack_from('=B',s,8)[0]
        ret = {'key-id':ki,
               'ipn':ipn,
               'key-len':kl,
               'wrapped-key':binascii.hexlify(s[9:])}
    return ret

# Diagnositc Report/Request optional subelements Std Table 8-143 & figures commented below