def checkTKIPtestVector(self, description, key, ta, iv, plainText, cipherText):
""" Process TKIP encryption test vectors (no MIC) """
print '%s %s %s'%('='*((54-len(description))/2),description,'='*((54-len(description))/2))
# Convert from octet lists to string
key = a2b_p(key)
ta = a2b_p(ta)
iv = a2b_p(iv)
pt = a2b_p(plainText)
kct = a2b_p(cipherText)
mixer = TKIP_Mixer(key,ta)
rc4key = mixer.newKey(iv)
alg = TKIP_encr(key)
alg.setTA(ta)
print 'key: %s'%b2a_p(key)[9:]
print 'rc4Key %s'%b2a_p(rc4key)[9:] # calculated
print 'ta: %s'%b2a_p(ta)[9:]
print 'iv: %s'%b2a_p(iv)[9:]
print 'pt: %s'%b2a_p(pt)[9:]
print 'kct: %s'%b2a_p(kct)[9:]
ct = alg.encrypt(pt, iv)
print 'ct: %s'%b2a_p(ct)[9:]
cpt = alg.decrypt(kct)
print 'cpt: %s'%b2a_p(cpt)[9:]
print '========================================================'
self.assertEqual( ct, kct )
alg.setKey(key)
dct = alg.decrypt( ct )
self.assertEqual( dct, pt )
def xtestTKIP_Mixer_TV_values(self):
""" Test using vectors from IEEE 802.11TGi D2.4.2 """
for testCase in TKIP_TestVector:
description = testCase['testCase']
tk = a2b_p(testCase['TK'])
ta = a2b_p(testCase['TA'])
pn = testCase['PN']
pnField = pack('<Q', pn)[:6]
print '==========================================================='
print 'testCase:%s'%description
print 'TK: %s'%b2a_p(tk)[9:]
print 'TA: %s'%b2a_p(ta)[9:]
keyId = 0
eh1 = chr((ord(pnField[1])|0x20)&0x7f)
eh = pnField[0]+eh1+pnField[1]+chr((keyId<<6)|0x20)+pnField[2:]
print 'EncHdr: %s (with KeyId=0)' % b2a_p(eh)[9:]
print 'PNfield: %s' % b2a_p(pnField)[9:]
print 'PNvalue: 0x%06X' % pn
print 'TSC?: [0x%04x, 0x%04x, 0x%04x]' % (unpack('<H',pnField[0:2])[0],\
unpack('<H',pnField[2:4])[0],unpack('<H',pnField[4:6])[0])
mixer = TKIP_Mixer(tk,ta)
newRC4Key = mixer.newKey(pnField)
p1kstring = ''.join([pack('>H',i) for i in mixer.phase1Key]) # a list of int's
print 'TTAK: [0x%04x, 0x%04x, 0x%04x, 0x%04x, 0x%04x]' % (mixer.phase1Key[0], \
mixer.phase1Key[1],mixer.phase1Key[2],mixer.phase1Key[3],mixer.phase1Key[4])
print 'P1K: %s'%b2a_p(p1kstring)[9:]
print 'RC4Key: %s' % b2a_p( newRC4Key )[9:]
print 'kRC4Key: %s' % b2a_p( a2b_p(testCase['RC4KEY']))[9:]
self.assertEqual(newRC4Key, a2b_p(testCase['RC4KEY']))
print '==========================================================='
def __init__(self, key=None, transmitterAddress=None, keyID=None):
""" Initialize TKIP_encr, key -> octet string for key """
assert(keyID == 0 or keyID == None), 'keyID should be zero in TKIP'
self.keyId = 0
self.name = 'TKIP_encr'
self.strength = 128
self.encryptHeaderSize = 8 # used to skip octets on decrypt
self.arc4 = ARC4() # base algorithm
self.keyMixer = TKIP_Mixer(key, transmitterAddress)
if key != None: # normally in base init, uses adjusted keySize
self.setKey(key)
if transmitterAddress != None:
self.setTA(transmitterAddress)
def testTKIP_Mixer_KnowValues(self):
""" Test using vectors from IEEE 802.11TGi D2.4.2 """
for testCase in TKIP_MixerTestCases:
description = testCase["testCase"]
tk = a2b_p(testCase["TK"])
ta = a2b_p(testCase["TA"])
iv32 = a2b_p(testCase["IV32"]) # last 4 octets of PN/IV field
iv16 = a2b_p(testCase["IV16"])
# NOTE - iv16 and iv32 are confused notation from early drafts
# may not match notation in the future
pnField = iv16[1] + iv16[0] + iv32[3] + iv32[2] + iv32[1] + iv32[0]
pn = unpack("<Q", pnField + 2 * chr(0))[0]
knownP1key = a2b_p(testCase["P1K"])
knownRC4Key = a2b_p(testCase["RC4KEY"])
print "==========================================================="
print "testCase:%s" % description
print "TK: %s" % b2a_p(tk)[9:]
print "TA: %s" % b2a_p(ta)[9:]
print "IV32: %s" % b2a_p(iv32)[9:]
print "IV16: %s" % b2a_p(iv16)[9:]
keyId = 0
eh1 = chr((ord(pnField[1]) | 0x20) & 0x7F)
eh = pnField[0] + eh1 + pnField[1] + chr((keyId << 6) | 0x20) + pnField[2:]
print "EncHdr: %s (with KeyId=0)" % b2a_p(eh)[9:]
print "PNfield: %s" % b2a_p(pnField)[9:]
print "PNvalue: hex 0x%012X decimal %d" % (pn, pn)
# print 'TSC: [0x%04x, 0x%04x, 0x%04x]' % (unpack('<H',pnField[0:2])[0],\
# unpack('<H',pnField[2:4])[0],unpack('<H',pnField[4:6])[0])
mixer = TKIP_Mixer(tk, ta)
newRC4Key = mixer.newKey(pnField)
p1kstring = "".join([pack(">H", i) for i in mixer.phase1Key]) # a list of int's
print "TTAK: [0x%04x, 0x%04x, 0x%04x, 0x%04x, 0x%04x]" % (
mixer.phase1Key[0],
mixer.phase1Key[1],
mixer.phase1Key[2],
mixer.phase1Key[3],
mixer.phase1Key[4],
)
print "P1K: %s" % b2a_p(p1kstring)[9:]
# print 'knownP1K:%s'%b2a_p(knownP1key)[9:]
self.assertEqual(p1kstring, knownP1key), "Phase1 Keys dont match"
print "RC4Key: %s" % b2a_p(newRC4Key)[9:]
# print 'knownRC4Key: %s'% b2a_p(knownRC4Key)[9:]
self.assertEqual(newRC4Key, knownRC4Key), "Final Key does not match"
print "==========================================================="
def testTKIP_Mixer_KnowValues(self):
""" Test using vectors from IEEE 802.11TGi D2.4.2 """
for testCase in TKIP_MixerTestCases:
description = testCase['testCase']
tk = a2b_p(testCase['TK'])
ta = a2b_p(testCase['TA'])
iv32 = a2b_p(testCase['IV32']) # last 4 octets of PN/IV field
iv16 = a2b_p(testCase['IV16'])
# NOTE - iv16 and iv32 are confused notation from early drafts
# may not match notation in the future
pnField = iv16[1] + iv16[0] + iv32[3] + iv32[2] + iv32[1] + iv32[0]
pn = unpack('<Q', pnField + 2 * chr(0))[0]
knownP1key = a2b_p(testCase['P1K'])
knownRC4Key = a2b_p(testCase['RC4KEY'])
print '==========================================================='
print 'testCase:%s' % description
print 'TK: %s' % b2a_p(tk)[9:]
print 'TA: %s' % b2a_p(ta)[9:]
print 'IV32: %s' % b2a_p(iv32)[9:]
print 'IV16: %s' % b2a_p(iv16)[9:]
keyId = 0
eh1 = chr((ord(pnField[1]) | 0x20) & 0x7f)
eh = pnField[0] + eh1 + pnField[1] + chr((keyId << 6)
| 0x20) + pnField[2:]
print 'EncHdr: %s (with KeyId=0)' % b2a_p(eh)[9:]
print 'PNfield: %s' % b2a_p(pnField)[9:]
print 'PNvalue: hex 0x%012X decimal %d' % (pn, pn)
#print 'TSC: [0x%04x, 0x%04x, 0x%04x]' % (unpack('<H',pnField[0:2])[0],\
# unpack('<H',pnField[2:4])[0],unpack('<H',pnField[4:6])[0])
mixer = TKIP_Mixer(tk, ta)
newRC4Key = mixer.newKey(pnField)
p1kstring = ''.join([pack('>H', i)
for i in mixer.phase1Key]) # a list of int's
print 'TTAK: [0x%04x, 0x%04x, 0x%04x, 0x%04x, 0x%04x]' % (mixer.phase1Key[0], \
mixer.phase1Key[1],mixer.phase1Key[2],mixer.phase1Key[3],mixer.phase1Key[4])
print 'P1K: %s' % b2a_p(p1kstring)[9:]
#print 'knownP1K:%s'%b2a_p(knownP1key)[9:]
self.assertEqual(p1kstring, knownP1key), 'Phase1 Keys dont match'
print 'RC4Key: %s' % b2a_p(newRC4Key)[9:]
#print 'knownRC4Key: %s'% b2a_p(knownRC4Key)[9:]
self.assertEqual(newRC4Key,
knownRC4Key), 'Final Key does not match'
print '==========================================================='
def xtestGunarExample1(self):
""" Test example from Gunnar 2003-01-27 """
tk1 = a2b_p( "A9 90 6D C8 3E 78 92 3F 86 04 E9 9E F6 CD BA BB" )
ta = a2b_p( "50 30 F1 84 44 08" )
iv32 = a2b_p( "B5039776" ) # [transmitted as B5 03 97 76]
iv16 = a2b_p( "E70C" )
p1k = a2b_p( "26D5 F1E1 2A59 2021 0E8E" )
rc4Key = a2b_p( "E7 67 0C 68 15 E0 2E 3F 1C 15 92 92 D4 E2 78 82" )
mixer = TKIP_Mixer(tk1,ta)
newRC4Key = mixer.newKey(iv16+iv32)
print "=== Gunnar Example ==="
print "rc4Key = ", b2a_p( rc4Key )
print "newRC4Key = ", b2a_p( newRC4Key )
print "knownp1K = ", b2a_p( p1k )
print "calcp1K = %04X %04X %04x %04x %04x" % (mixer.phase1Key[0],mixer.phase1Key[1],mixer.phase1Key[2],mixer.phase1Key[3],mixer.phase1Key[4])
self.assertEqual(rc4Key,newRC4Key)
def xtestTKIP_Mixer_TV_values(self):
""" Test using vectors from IEEE 802.11TGi D2.4.2 """
for testCase in TKIP_TestVector:
description = testCase["testCase"]
tk = a2b_p(testCase["TK"])
ta = a2b_p(testCase["TA"])
pn = testCase["PN"]
pnField = pack("<Q", pn)[:6]
print "==========================================================="
print "testCase:%s" % description
print "TK: %s" % b2a_p(tk)[9:]
print "TA: %s" % b2a_p(ta)[9:]
keyId = 0
eh1 = chr((ord(pnField[1]) | 0x20) & 0x7F)
eh = pnField[0] + eh1 + pnField[1] + chr((keyId << 6) | 0x20) + pnField[2:]
print "EncHdr: %s (with KeyId=0)" % b2a_p(eh)[9:]
print "PNfield: %s" % b2a_p(pnField)[9:]
print "PNvalue: 0x%06X" % pn
print "TSC?: [0x%04x, 0x%04x, 0x%04x]" % (
unpack("<H", pnField[0:2])[0],
unpack("<H", pnField[2:4])[0],
unpack("<H", pnField[4:6])[0],
)
mixer = TKIP_Mixer(tk, ta)
newRC4Key = mixer.newKey(pnField)
p1kstring = "".join([pack(">H", i) for i in mixer.phase1Key]) # a list of int's
print "TTAK: [0x%04x, 0x%04x, 0x%04x, 0x%04x, 0x%04x]" % (
mixer.phase1Key[0],
mixer.phase1Key[1],
mixer.phase1Key[2],
mixer.phase1Key[3],
mixer.phase1Key[4],
)
print "P1K: %s" % b2a_p(p1kstring)[9:]
print "RC4Key: %s" % b2a_p(newRC4Key)[9:]
print "kRC4Key: %s" % b2a_p(a2b_p(testCase["RC4KEY"]))[9:]
self.assertEqual(newRC4Key, a2b_p(testCase["RC4KEY"]))
print "==========================================================="
def __init__(self, key=None, transmitterAddress=None, keyID=None):
""" Initialize TKIP_encr, key -> octet string for key """
assert(keyID==0 or keyID==None), 'keyID should be zero in TKIP'
self.keyId = 0
self.name = 'TKIP_encr'
self.strength = 128
self.encryptHeaderSize = 8 # used to skip octets on decrypt
self.arc4 = ARC4() # base algorithm
self.keyMixer = TKIP_Mixer(key,transmitterAddress)
if key != None: # normally in base init, uses adjusted keySize
self.setKey(key)
if transmitterAddress!=None:
self.setTA(transmitterAddress)
def checkTKIPtestVector(self, description, key, ta, iv, plainText,
cipherText):
""" Process TKIP encryption test vectors (no MIC) """
print '%s %s %s' % ('=' *
((54 - len(description)) / 2), description, '=' *
((54 - len(description)) / 2))
# Convert from octet lists to string
key = a2b_p(key)
ta = a2b_p(ta)
iv = a2b_p(iv)
pt = a2b_p(plainText)
kct = a2b_p(cipherText)
mixer = TKIP_Mixer(key, ta)
rc4key = mixer.newKey(iv)
alg = TKIP_encr(key)
alg.setTA(ta)
print 'key: %s' % b2a_p(key)[9:]
print 'rc4Key %s' % b2a_p(rc4key)[9:] # calculated
print 'ta: %s' % b2a_p(ta)[9:]
print 'iv: %s' % b2a_p(iv)[9:]
print 'pt: %s' % b2a_p(pt)[9:]
print 'kct: %s' % b2a_p(kct)[9:]
ct = alg.encrypt(pt, iv)
print 'ct: %s' % b2a_p(ct)[9:]
cpt = alg.decrypt(kct)
print 'cpt: %s' % b2a_p(cpt)[9:]
print '========================================================'
self.assertEqual(ct, kct)
alg.setKey(key)
dct = alg.decrypt(ct)
self.assertEqual(dct, pt)
def xtestTKIP_Mixer_Sequence(self):
""" Test TKIP Mixing using alternate calling approaches """
key = 16 * chr(0)
ta = 6 * chr(0)
tscOctets = 6 * chr(0)
keyMixer = TKIP_Mixer(key)
keyMixer.setTA(ta)
newKey = keyMixer.newKey(tscOctets)
keyMixer = TKIP_Mixer()
keyMixer.setTA(ta)
keyMixer.setKey(key)
newKey = keyMixer.newKey(tscOctets)
keyMixer = TKIP_Mixer(transmitterAddress=ta)
keyMixer.setKey(key)
newKey = keyMixer.newKey(tscOctets)
class TKIP_encr:
""" TKIP Stream Cipher Algorithm without the Michael integrity check
TKIP encryption on an MPDU using WEP with a longer 'iv'
and the TKIP key mixing algorithm . This does NOT include
the Michael integrity algorithm that operates on the MSDU data.
"""
def __init__(self, key=None, transmitterAddress=None, keyID=None):
""" Initialize TKIP_encr, key -> octet string for key """
assert(keyID==0 or keyID==None), 'keyID should be zero in TKIP'
self.keyId = 0
self.name = 'TKIP_encr'
self.strength = 128
self.encryptHeaderSize = 8 # used to skip octets on decrypt
self.arc4 = ARC4() # base algorithm
self.keyMixer = TKIP_Mixer(key,transmitterAddress)
if key != None: # normally in base init, uses adjusted keySize
self.setKey(key)
if transmitterAddress!=None:
self.setTA(transmitterAddress)
def setKey(self, key, ta=None):
""" Set key, key string is 16 octets long """
self.keyMixer.setKey(key)
if ta!=None:
self.setTA(ta)
def setTA(self, transmitterAddress):
""" Set the transmitter address """
self.keyMixer.setTA(transmitterAddress)
def _getIVandKeyID(self, cipherText):
""" Parse the TKIP header to get iv and set KeyID
iv is returned as octet string and is little-endian!!!
"""
assert(ord(cipherText[3])& 0x20),'extIV SHOULD be set in TKIP header'
self.setCurrentKeyID = (ord(cipherText[3])&0xC0)>>6
return cipherText[:3] + cipherText[5:9] # note iv octets are little-endian!!!
def _makeARC4key(self, tscOctets, keyID=0):
""" Make an ARC4 key from TKIP Sequence Counter Octets (little-endian) """
if keyID!=0 :
raise 'TKIP expects keyID of zero'
print "tscOctets in tkmixer=",b2a_p(tscOctets)
newKey = self.keyMixer.newKey(tscOctets)
print "newKey=", b2a_p(newKey)
return newKey
def encrypt(self, plainText, iv):
""" Encrypt a string and return a binary string
iv is 6 octets of little-endian encoded pn
"""
assert(len(iv)==6),'TKIP bad IV size on encryption'
self.pnField = iv
self.arc4.setKey( self._makeARC4key(iv) )
eh1 = chr((ord(iv[0])|0x20)&0x7f)
encryptionHeader = iv[0] + eh1 + iv[1] + chr((self.keyId<<6)|0x20) + iv[2:]
crc = pack('<I', crc32(plainText) )
cipherText = encryptionHeader + self.arc4.encrypt(plainText+crc)
return cipherText
def decrypt(self, cipherText):
""" Decrypt a WEP packet, assumes WEP 4 byte header on packet """
assert(ord(cipherText[3])& 0x20),'extIV SHOULD be set in TKIP header'
self.setCurrentKeyID = (ord(cipherText[3])&0xC0)>>6
iv = cipherText[0]+cipherText[2]+cipherText[4:8]
self.pnField = iv
self.arc4.setKey( self._makeARC4key(iv) )
plainText = self.arc4.decrypt(cipherText[self.encryptHeaderSize:])
if plainText[-4:] != pack('<I',crc32(plainText[:-4])): # check data integrity
raise IntegrityCheckError, 'WEP CRC Integrity Check Error'
return plainText[:-4]
class TKIP_encr:
""" TKIP Stream Cipher Algorithm without the Michael integrity check
TKIP encryption on an MPDU using WEP with a longer 'iv'
and the TKIP key mixing algorithm . This does NOT include
the Michael integrity algorithm that operates on the MSDU data.
"""
def __init__(self, key=None, transmitterAddress=None, keyID=None):
""" Initialize TKIP_encr, key -> octet string for key """
assert(keyID == 0 or keyID == None), 'keyID should be zero in TKIP'
self.keyId = 0
self.name = 'TKIP_encr'
self.strength = 128
self.encryptHeaderSize = 8 # used to skip octets on decrypt
self.arc4 = ARC4() # base algorithm
self.keyMixer = TKIP_Mixer(key, transmitterAddress)
if key != None: # normally in base init, uses adjusted keySize
self.setKey(key)
if transmitterAddress != None:
self.setTA(transmitterAddress)
def setKey(self, key, ta=None):
""" Set key, key string is 16 octets long """
self.keyMixer.setKey(key)
if ta != None:
self.setTA(ta)
def setTA(self, transmitterAddress):
""" Set the transmitter address """
self.keyMixer.setTA(transmitterAddress)
def _getIVandKeyID(self, cipherText):
""" Parse the TKIP header to get iv and set KeyID
iv is returned as octet string and is little-endian!!!
"""
assert(ord(cipherText[3]) & 0x20), 'extIV SHOULD be set in TKIP header'
self.setCurrentKeyID = (ord(cipherText[3]) & 0xC0) >> 6
return cipherText[:3] + cipherText[5:9] # note iv octets are little-endian!!!
def _makeARC4key(self, tscOctets, keyID=0):
""" Make an ARC4 key from TKIP Sequence Counter Octets (little-endian) """
if keyID != 0:
raise 'TKIP expects keyID of zero'
print("tscOctets in tkmixer=", b2a_p(tscOctets))
newKey = self.keyMixer.newKey(tscOctets)
print("newKey=", b2a_p(newKey))
return newKey
def encrypt(self, plainText, iv):
""" Encrypt a string and return a binary string
iv is 6 octets of little-endian encoded pn
"""
assert(len(iv) == 6), 'TKIP bad IV size on encryption'
self.pnField = iv
self.arc4.setKey(self._makeARC4key(iv))
eh1 = chr((ord(iv[0]) | 0x20) & 0x7f)
encryptionHeader = iv[0] + eh1 + iv[1] + chr((self.keyId << 6) | 0x20) + iv[2:]
crc = pack('<I', crc32(plainText))
cipherText = encryptionHeader + self.arc4.encrypt(plainText + crc)
return cipherText
def decrypt(self, cipherText):
""" Decrypt a WEP packet, assumes WEP 4 byte header on packet """
assert(ord(cipherText[3]) & 0x20), 'extIV SHOULD be set in TKIP header'
self.setCurrentKeyID = (ord(cipherText[3]) & 0xC0) >> 6
iv = cipherText[0] + cipherText[2] + cipherText[4:8]
self.pnField = iv
self.arc4.setKey(self._makeARC4key(iv))
plainText = self.arc4.decrypt(cipherText[self.encryptHeaderSize:])
if plainText[-4:] != pack('<I', crc32(plainText[:-4])): # check data integrity
raise IntegrityCheckError, 'WEP CRC Integrity Check Error'
return plainText[:-4]
def xtestTKIP_Mixer_Sequence(self):
""" Test TKIP Mixing using alternate calling approaches """
key = 16*chr(0)
ta = 6*chr(0)
tscOctets = 6*chr(0)
keyMixer = TKIP_Mixer(key)
keyMixer.setTA(ta)
newKey = keyMixer.newKey(tscOctets)
keyMixer = TKIP_Mixer()
keyMixer.setTA(ta)
keyMixer.setKey(key)
newKey = keyMixer.newKey(tscOctets)
keyMixer = TKIP_Mixer(transmitterAddress=ta)
keyMixer.setKey(key)
newKey = keyMixer.newKey(tscOctets)
