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)*2 + bit(x,c)*4 + 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‘)
