def main():
f = open('ciphertext.txt','w')
key = int(sys.argv[2],16)
myBlockEncryptCipher = blockCipher(key)
myBlockEncryptCipher.blocks = readInput()
for block in myBlockEncryptCipher.blocks:
myBlockEncryptCipher.block = int(''.join(block),16)
myBlockEncryptCipher.whitening()
myBlockEncryptCipher.subkeyGenerator()
for i in range (0,20):
myBlockEncryptCipher.fFunction()
temp = myBlockEncryptCipher.rightRotate16bitsR2()
myBlockEncryptCipher.r2 = myBlockEncryptCipher.r0
myBlockEncryptCipher.r0 = temp
r3_ = myBlockEncryptCipher.leftRotate16bitsR3()
temp = r3_ ^ myBlockEncryptCipher.F1
myBlockEncryptCipher.r3 = myBlockEncryptCipher.r1
myBlockEncryptCipher.r1 = temp
#print "round", myBlockEncryptCipher.round, format(myBlockEncryptCipher.r0,"04x"),format (myBlockEncryptCipher.r1,"04x"),format(myBlockEncryptCipher.r2,"04x"),format(myBlockEncryptCipher.r3,"04x")
myBlockEncryptCipher.round += 1
ciphertext = myBlockEncryptCipher.outputWhitening()
#print 'Ciphertext after 20 rounds',format(myBlockEncryptCipher.C0,"04x"),format(myBlockEncryptCipher.C1,"04x"),format(myBlockEncryptCipher.C2,"04x"),format(myBlockEncryptCipher.C3,"04x")
f.write(format(myBlockEncryptCipher.C0,"04x")+format(myBlockEncryptCipher.C1,"04x")+format(myBlockEncryptCipher.C2,"04x")+format(myBlockEncryptCipher.C3,"04x"))
def main():
f = open('decrypted.txt','w')
key = int(sys.argv[2],16)
myBlockDecryptCipher = blockCipher(key)
myBlockDecryptCipher.blocks = readInput()
for block in myBlockDecryptCipher.blocks:
myBlockDecryptCipher.block = int(''.join(block),16)
myBlockDecryptCipher.whitening()
myBlockDecryptCipher.subkeyGenerator()
myBlockDecryptCipher.round = 19
for i in range(0,20):
myBlockDecryptCipher.fFunction()
previousR0 = myBlockDecryptCipher.r0
previousR1 = myBlockDecryptCipher.r1
myBlockDecryptCipher.r0 = myBlockDecryptCipher.leftRotate16bitsR2() ^ myBlockDecryptCipher.F0
myBlockDecryptCipher.r1 = myBlockDecryptCipher.rightRotate16bitsR3()
myBlockDecryptCipher.r2 = previousR0
myBlockDecryptCipher.r3 = previousR1
#print "round", myBlockDecryptCipher.round, format(myBlockDecryptCipher.r0,"04x"),format(myBlockDecryptCipher.r1,"04x"),format(myBlockDecryptCipher.r2,"04x"),format(myBlockDecryptCipher.r3,"04x")
myBlockDecryptCipher.round -= 1
plaintext = myBlockDecryptCipher.outputWhitening()
#print 'Plaintext after 20 rounds',format(myBlockDecryptCipher.C0,"04x"),format(myBlockDecryptCipher.C1,"04x"),format(myBlockDecryptCipher.C2,"04x"),format(myBlockDecryptCipher.C3,"04x")
#print format(myBlockDecryptCipher.C0,"04x").decode("hex"),format(myBlockDecryptCipher.C1,"04x").decode("hex"),format(myBlockDecryptCipher.C2,"04x").decode("hex"),format(myBlockDecryptCipher.C3,"04x").decode("hex")
f.write(format(myBlockDecryptCipher.C0,"04x").decode("hex")+format(myBlockDecryptCipher.C1,"04x").decode("hex")+format(myBlockDecryptCipher.C2,"04x").decode("hex")+format(myBlockDecryptCipher.C3,"04x").decode("hex"))