_mpdu.py 文件源码

def _tkip_(f,m):
    """
     parse tkip data from frame f into mac dict
     :param f: frame
     :param m: mpdu dict
    """
    try:
        keyid = struct.unpack_from('=B',f,m['offset']+_TKIP_KEY_BYTE_)[0]
        m['l3-crypt'] = {'type':'tkip',
                         'iv':{'tsc1':f[m['offset']+_TKIP_TSC1_BYTE_],
                               'wep-seed':f[m['offset']+_TKIP_WEPSEED_BYTE_],
                               'tsc0':f[m['offset']+_TKIP_TSC0_BYTE_],
                               'key-id':{'rsrv':bits.leastx(_TKIP_EXT_IV_,keyid),
                                         'ext-iv':bits.midx(_TKIP_EXT_IV_,_TKIP_EXT_IV_LEN_,keyid),
                                         'key-id':bits.mostx(_TKIP_EXT_IV_+_TKIP_EXT_IV_LEN_,keyid)}},
                         'ext-iv':{'tsc2':f[m['offset']+_TKIP_TSC2_BYTE_],
                                   'tsc3':f[m['offset']+_TKIP_TSC3_BYTE_],
                                   'tsc4':f[m['offset']+_TKIP_TSC4_BYTE_],
                                   'tsc5':f[m['offset']+_TKIP_TSC5_BYTE_]},
                         'mic':f[-(_TKIP_MIC_LEN_ + _TKIP_ICV_LEN_):-_TKIP_ICV_LEN_],
                         'icv':f[-_TKIP_ICV_LEN_:]}
        m['offset'] += _TKIP_IV_LEN_
        m['stripped'] += _TKIP_MIC_LEN_ + _TKIP_ICV_LEN_
    except Exception as e:
        m['err'].append(('l3-crypt.tkip',"parsing {0}".format(e)))

#### CCMP Std 11.4.3.2
# <MAC HDR>|CCMP HDR|DATA|MIC|FCS
# bytes var|       8| >=1|  8|  4
# where the CCMP Header is defined
#    PN0|PN1|RSRV|RSRV|EXT IV|KeyID|PN2|PN3|PN4|PN5
# bits 8|  8|   8|   5|     1|    2|  8|  8|  8|  8