Python implementations of KeeLoq

KEELOQ_NLF = 0x3a5c742e

def bit (x,n):

x = (((x) >> (n)) &1)

return x

def g5 (x,a,b,c,d,e):

y = (bit (x,a) + bit (x,b) * * + bit (x,c) + bit (x,d) *8 + bit (x,e) *16)

Return y

def keeloq_encrypt (Data,key):

x = Int (data)

For I in range (528):

x = (x>>1) ^ ((bit (x,0) ^ bit (x,16) ^ bit (key,i&63) ^ bit (keeloq_nlf,g5 (x,1,9,20,26,31))) <<31);

return x

def keeloq_decrypt (Data,key):

x = Int (data)

For I in range (528):

x = Int (x<<1) ^ bit (x,31) ^ bit (x,15) ^ bit (key, (15-i) &63) ^ bit (keeloq_nlf,g5 (x,0,8,19,25,30))

return x

cmd = 0

while (cmd! = 3):

Try

cmd = input ("Please select the function \ n 1:keeloq encrypt\n 2:keeloq decrypt\n 3:quit\n Select:")

if cmd = = 1:

Data1 = input ("Please input data for KeeLoq Encrypt:")

SK = input ("Please input Sk:")

result = Keeloq_encrypt (Data1,sk)

Print (' \nresult =%x\n '%result)

if cmd = = 2:

Data1 = input ("Please input data for KeeLoq Decrypt:")

SK = input ("Please input Sk:")

result = Keeloq_decrypt (Data1,sk) & 0xFFFFFFFF

Print (' \nresult =%x\n '%result)

Except

Pass

Print (' End ')

Python implementations of KeeLoq