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"""
Lilliput TBC
"""
import constants
import multiplications
BLOCK_BITS = 128
KEY_BITS = 128
TWEAK_BITS = 192
LANE_BITS = 64
LANE_BYTES = LANE_BITS / 8
LANES = int((TWEAK_BITS+KEY_BITS) / LANE_BITS)
ROUNDS = 32
BLOCK_BYTES = int(BLOCK_BITS / 8)
TWEAKEY_BITS = KEY_BITS + TWEAK_BITS
KEY_BYTES = int(KEY_BITS / 8)
TWEAK_BYTES = int(TWEAK_BITS / 8)
TWEAKEY_BYTES = int(TWEAKEY_BITS / 8)
Sbox = constants.Sbox
MultiplyM = multiplications.MultiplyM
MultiplyM2 = multiplications.MultiplyM2
MultiplyM3 = multiplications.MultiplyM3
MultiplyMR = multiplications.MultiplyMR
MultiplyMR2 = multiplications.MultiplyMR2
MultiplyMR3 = multiplications.MultiplyMR3
permutation = [14, 11, 12, 10, 8, 9, 13, 15, 3, 1, 4, 5, 6, 0, 2, 7]
permutationInv = [13, 9, 14, 8, 10, 11, 12, 15, 4, 5, 3, 1, 2, 6 ,0 ,7]
# Personnal global variables to check better
TKs = [[0 for byte in range(0, TWEAKEY_BYTES)] for round in range(0, ROUNDS)]
RTKs = [[0 for byte in range(0, 8)] for round in range(0, ROUNDS)]
States = [[0 for byte in range(0, BLOCK_BYTES)] for round in range(0, ROUNDS)]
################################################################################
def BuildTweakey(tweak, key) :
tweakey = [0 for byte in range(0, TWEAKEY_BYTES)]
for byte in range(0, TWEAK_BYTES) :
tweakey[byte] = tweak[byte]
for byte in range(0, KEY_BYTES) :
tweakey[byte + TWEAK_BYTES] = key[byte]
return tweakey
#############################
def RoundTweakeySchedule(tweakey) :
# Multiplication
lanes = [tweakey[word * 8:(word+1) * 8] for word in range(0, LANES)]
tweakey_multiplied = []
for word in range(0, LANES) :
if word == 0 :
tweakey_multiplied += list(lanes[0])
elif word == 1 :
tweakey_multiplied += MultiplyM(lanes[1])
elif word == 2 :
tweakey_multiplied += MultiplyM2(lanes[2])
elif word == 3 :
tweakey_multiplied += MultiplyM3(lanes[3])
elif word == 4 :
tweakey_multiplied += MultiplyMR(lanes[4])
elif word == 5 :
tweakey_multiplied += MultiplyMR2(lanes[5])
elif word == 6 :
tweakey_multiplied += MultiplyMR3(lanes[6])
return tweakey_multiplied ;
def SubTweakeyExtract(tweakey, round) :
subtweakey = [0 for byte in range(0, 8)]
for byte in range(0, TWEAKEY_BYTES) :
subtweakey[byte % 8] ^= tweakey[byte]
subtweakey[0] ^= round
return subtweakey
def TweakeyScheduleWhole(tweakey) :
# store main tweakey in TKs[0]
# and corresponding RTKs[0]
TKs[0] = tweakey
RTKs[0] = SubTweakeyExtract(TKs[0], 0)
for round in range(1, ROUNDS) :
TKs[round] = RoundTweakeySchedule(TKs[round - 1])
RTKs[round] = SubTweakeyExtract(TKs[round], round)
################################################################################
def NonLinearLayer(state, subtweakey) :
variables_xored = [0 for byte in range(0, 8)]
for byte in range(0,8) :
variables_xored[byte] = state[byte] ^ subtweakey[byte]
variables_sboxed = [0 for byte in range(0, 8)]
for byte in range(0, 8) :
variables_sboxed[byte] = Sbox[variables_xored[byte]]
state_output = [0 for byte in range(0, BLOCK_BYTES)]
for byte in range(0,BLOCK_BYTES) :
state_output[byte] = state[byte]
for byte in range(0, 8) :
state_output[15 - byte] ^= variables_sboxed[byte]
return state_output
def LinearLayer(state) :
state_output = [0 for byte in range(0, BLOCK_BYTES)]
for byte in range(0, BLOCK_BYTES) :
state_output[byte] = state[byte]
for byte in range(1, 8) :
state_output[15] ^= state[byte]
for byte in range(9, 15) :
state_output[byte] ^= state[7]
return state_output
def PermutationLayerEnc(state) :
state_output = [0 for byte in range(0, BLOCK_BYTES)]
for byte in range(0, BLOCK_BYTES) :
state_output[byte] = state[permutation[byte]]
return state_output
def PermutationLayerDec(state) :
state_output = [0 for byte in range(0, BLOCK_BYTES)]
for byte in range(0, BLOCK_BYTES) :
state_output[byte] = state[permutationInv[byte]]
return state_output
def OneRoundEGFNEnc(state, subtweakey, round) :
state_non_linear = NonLinearLayer(state, subtweakey)
state_linear = LinearLayer(state_non_linear)
state_permutation = PermutationLayerEnc(state_linear)
return state_permutation
def LastRoundEGFN(state, subtweakey, round) :
state_non_linear = NonLinearLayer(state, subtweakey)
state_linear = LinearLayer(state_non_linear)
return state_linear
def OneRoundEGFNDec(state, subtweakey, round) :
state_non_linear = NonLinearLayer(state, subtweakey)
state_linear = LinearLayer(state_non_linear)
state_permutation = PermutationLayerDec(state_linear)
return state_permutation
################################################################################
# Lilliput TBC
def LilliputTBCEnc(tweak, key, message) :
global TKs
global RTKs
global states
TKs = [[0 for byte in range(0, TWEAKEY_BYTES)] for round in range(0, ROUNDS)]
RTKs = [[0 for byte in range(0, 8)] for round in range(0, ROUNDS)]
States = [[0 for byte in range(0, BLOCK_BYTES)] for round in range(0, ROUNDS)]
tweakey = BuildTweakey(tweak, key)
TweakeyScheduleWhole(tweakey)
state = [0 for byte in range(0, BLOCK_BYTES)]
for byte in range(0, BLOCK_BYTES) :
state[byte] = message[byte]
for round in range(0, ROUNDS - 1) :
state_output = OneRoundEGFNEnc(state, RTKs[round], round = round)
for byte in range(0, BLOCK_BYTES) :
state[byte] = state_output[byte]
state_output = LastRoundEGFN(state, RTKs[ROUNDS - 1], round = ROUNDS - 1)
return state_output
def LilliputTBCDec(tweak, key, cipher) :
global TKs
global RTKs
global states
TKs = [[0 for byte in range(0, TWEAKEY_BYTES)] for round in range(0, ROUNDS)]
RTKs = [[0 for byte in range(0, 8)] for round in range(0, ROUNDS)]
States = [[0 for byte in range(0, BLOCK_BYTES)] for round in range(0, ROUNDS)]
tweakey = BuildTweakey(tweak, key)
TweakeyScheduleWhole(tweakey)
state = [0 for byte in range(0, BLOCK_BYTES)]
for byte in range(0, BLOCK_BYTES) :
state[byte] = cipher[byte]
for round in range(0, ROUNDS - 1) :
state_output = OneRoundEGFNDec(state, RTKs[ROUNDS - round - 1], round = round)
for byte in range(0, BLOCK_BYTES) :
state[byte] = state_output[byte]
state_output = LastRoundEGFN(state, RTKs[0], round = ROUNDS - 1)
return state_output
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