def generateMAC(message, key):
padding = ""
endblock = ""
(K1, K2) = generateSubkeys(key, "\x00\x00\x00\x00\x00\x00\x00\x1b")
#print K1.encode("hex")
#print K2.encode("hex")
if len(message) % 8:
padLen = 8 - (len(message) % 8)
padding = "\x80" + ("\x00" * (padLen - 1))
message = message + padding
endblock = message[-8:len(message)]
XORencryptor = XOR.XORCipher(K2)
endblock = XORencryptor.encrypt(endblock)
else:
endblock = message[-8:len(message)]
XORencryptor = XOR.XORCipher(K1)
endblock = XORencryptor.encrypt(endblock)
message = message[0:-8] + endblock
CMACencryptor = DES3.new(key, DES3.MODE_CBC,
'\x00\x00\x00\x00\x00\x00\x00\x00')
mac = CMACencryptor.encrypt(message)
#print key.encode("hex")
#print message.encode("hex")
#print mac.encode("hex")
#return mac
return mac[-8:len(mac)]
def generateSubkeys(MACKey, constant):
#create encrptor
encryptor = DES3.new(MACKey, DES3.MODE_ECB,
'\x00\x00\x00\x00\x00\x00\x00\x00')
XORencryptor = XOR.XORCipher(constant)
K1 = ""
K2 = ""
zeros = "\x00" * 8 #8 bytes of zeros
S = encryptor.encrypt(zeros)
#print S.encode("hex")
if int(S[0].encode("hex"), 16) & 0x80:
shiftedS = "%016X" % (
(int(S.encode("hex"), 16) << 1) & 0xFFFFFFFFFFFFFFFF)
K1 = XORencryptor.encrypt(shiftedS.decode("hex"))
else:
shiftedS = "%016X" % (
(int(S.encode("hex"), 16) << 1) & 0xFFFFFFFFFFFFFFFF)
K1 = shiftedS.decode("hex")
if (int(K1[0].encode("hex"), 16) & 0x80):
#print K1.encode("hex")
shiftedS = "%016X" % (
(int(K1.encode("hex"), 16) << 1) & 0xFFFFFFFFFFFFFFFF)
K2 = XORencryptor.encrypt(shiftedS.decode("hex"))
else:
shiftedS = "%016X" % (
(int(K1.encode("hex"), 16) << 1) & 0xFFFFFFFFFFFFFFFF)
K2 = shiftedS.decode("hex")
return K1, K2
def decrypter(cleardata):
data = XOR.XORCipher(key)
return data.decrypt(cleardata)
from Crypto.Cipher import XOR
key = "abcdefghijklij"
xor = XOR.XORCipher(key) # To encrypt
xor1 = XOR.XORCipher(key) # To decrypt
def enc(sock, message, addr):
abcd = xor.encrypt(message)
print message == dec(sock, abcd, addr)
sock.sendto(abcd, addr)
return abcd
def dec(sock, message, addr):
abcd = xor1.decrypt(message)
return abcd
#message = "dfjsdfjsdfjdsfdfsk"
#print message
#newm = enc(1, message, message)
#print newm
#print dec(1, newm, newm)
