def encode_ECB(data,key):
keys = gen_keys(key)
encoded = ''
padded = False
while not padded:
#PADDING
if len(data) < 64:
remaining = len(data) / 8
for x in range(remaining):
data += decimal2binary(remaining,places=8)
padded = True
ip = permute(data[0:64],IP)
prev_L = ip[:32]
prev_R = ip[32:]
for x in range(0,16):
L = prev_R
R = xor(prev_L,function(prev_R,keys[x]))
prev_L = L
prev_R = R
RL = R + L
next = permute(RL,IP_INVERSE)
encoded += next
data = data[64:]
return encoded
def function(d,key):
data = xor(E(d),key)
s_result = ''
for index in range(1,9):
s = S[index]
B = data[(index-1)*6:(index-1)*6+6]
row = binary2decimal(B[0]+B[5])
col = binary2decimal(B[1:5])
s_result += decimal2binary(s[row][col],places=4)
return permute(s_result,P)
