def test3(self):
spnKey = [
bst.Bitset(0x1234, 16),
bst.Bitset(0x5678, 16),
bst.Bitset(0x9ABC, 16),
bst.Bitset(0xDEF0, 16),
bst.Bitset(0x1357, 16)
]
# process of encrypting
#deltaX = utl.toBitSet(0x0b00, 16)
deltaX = utl.toBitSet(0x1234, 16)
for i in range(4):
deltaY = self.partialEncrypt(deltaX, spnKey[i], i)
print('y', i + 1, '=', hex(int(deltaY)))
deltaX = deltaY
deltaY ^= spnKey[4]
print('y5 = ', hex(int(deltaY)))
# process of encrypting
deltaY ^= spnKey[4]
print('x4 = ', hex(int(deltaY)))
for i in range(3, -1, -1):
deltaX = self.partialDecrypt(deltaY, spnKey[i], i)
print('x', i, '=', hex(int(deltaX)))
deltaY = deltaX
def getSBoxInvGroup(self, bits16):
result = bst.Bitset(0, 16)
for i in range(4):
toSBox = bst.Bitset(0, 4)
for j in range(4):
toSBox[j] = bits16[i * 4 + j]
fromSBox = self.getSBoxInv(toSBox)
for j in range(4):
result[i * 4 + j] = fromSBox[j]
return result
def getSBoxGroup(self, bits16):
result = bst.Bitset(0, 16)
for i in range(4):
toSBox = bst.Bitset(0, 4)
for j in range(4):
# toSBox.set(j, bSet.get(i * 4 + j))
toSBox[j] = bits16[i * 4 + j]
fromSBox = self.getSBox(toSBox)
for j in range(4):
result[i * 4 + j] = fromSBox[j]
return result
def test2(self):
spnKey = [
bst.Bitset(0x1234, 16),
bst.Bitset(0x5678, 16),
bst.Bitset(0x9ABC, 16),
bst.Bitset(0xDEF0, 16),
bst.Bitset(0x1357, 16)
]
pt = 0x1234
ctenc = self.Encrypt(utl.toBitSet(pt, 16), spnKey)
#ctenc = utl.toBitSet(0x52C0, 16)
ptdec = self.Decrypt(ctenc, spnKey)
print('Step1: Encrypt(0x1234) = ', hex(int(ctenc)),
'\nStep2: Decrypt(', hex(int(ctenc)), ') = ',
hex(int(ptdec)), '\nStep3: The original plaintext = ', hex(pt),
', it equals to the result of Step2')
def toBitSet(value, totalBits):
idx = totalBits - 1
result = bst.Bitset(0, totalBits)
while value > 0:
#result.set(idx, value % 2 == 1)
result[idx] = (value % 2 == 1)
value //= 2
idx -= 1
return result
def __init__(self,
pcPair=5000,
keys=[0x1234, 0x5678, 0x9ABC, 0xDEF0, 0xABCD]):
self.spnKey = []
for i in range(5):
self.spnKey.append(bst.Bitset(keys[i], 16))
key5 = self.spnKey
print('\n\n5 keys = ', hex(int(key5[0])), hex(int(key5[1])),
hex(int(key5[2])), hex(int(key5[3])), hex(int(key5[4])))
self.noPair = pcPair
print('Plain/Cipher text pair = ', pcPair, '\n')
def ComputeDiffCharacteristic(self, seed=0x0b00):
SBox = spn.SpnCipher()
rst = bst.Bitset(seed, 16)
print('S1.DC.X = ', hex(int(rst)))
rst = SBox.getSBoxGroup(rst)
print('S1.DC.Y = ', hex(int(rst)))
rst = SBox.permuteBits(rst)
print('S2.DC.X = ', hex(int(rst)))
rst = SBox.getSBoxGroup(rst)
print('S2.DC.Y = ', hex(int(rst)))
rst = SBox.permuteBits(rst)
rst = SBox.permuteBits(rst)
print('S3.DC.X = ', hex(int(rst)))
rst = SBox.getSBoxGroup(rst)
print('S3.DC.Y = ', hex(int(rst)))
rst = SBox.permuteBits(rst)
print('S4.DC.X = ', hex(int(rst)))
return
def getCopy(bset, totalBits):
newset = bst.Bitset(0, totalBits)
for i in range(totalBits):
newset[i] = bset[i]
return newset
def permuteBits(self, bits16):
bSetPerm = bst.Bitset(0, 16)
for i in range(16):
bSetPerm[self.PermuteTbl[i]] = bits16[i]
return bSetPerm