def decrypt(word, key):
ip = IP(word)
helper.debug(["IP", ip])
key1 = Key_generator.generate_key(key, 1)
helper.debug(["KE2", key1])
key2 = Key_generator.generate_key(key, 2)
helper.debug(["KEY2", key2])
fk2 = fk_function.FK(ip, key2)
helper.debug(["FK1", fk2])
sw = SW(fk2)
helper.debug(["SW", sw])
fk1 = fk_function.FK(sw, key1)
helper.debug(["FK1", fk1])
ip_1 = IP_1(fk1)
helper.debug(["IP-1", ip_1])
return ip_1
def test_FK():
word = bitarray()
for i in range(0, 64):
word.append(randint(0, 1))
key = bitarray()
for i in range(0, 48):
key.append(randint(0, 1))
print "WORD", word
print "KEY", key
print "FK", Fk_function.FK(word, key)
def decryptage(plaintext, key):
keys = key_generator.generate_keys(key, nbRound)
word = key_generator.IP(plaintext)
for round in range(0, nbRound):
word = fk_function.FK(word, keys[nbRound - 1 - round])
leftBlock = word[0:32]
rightBlock = word[32:]
word = rightBlock + leftBlock
word = key_generator.IP1(word)
return word