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hight.py
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hight.py
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def list_to_byte(lst):
byte = 0
for bit in lst:
byte = (byte << 1) | bit
return byte
def rotate_bits(x, n): # shift bits leftward
return ((x << n) % 256) | (x >> (8 - n))
def whitening_key_generation(MK):
WK = [None] * 8
for i in range(4):
WK[i] = MK[i + 12]
WK[i + 4] = MK[i]
return WK
def constant_generation():
s = [0, 1, 0, 1, 1, 0, 1]
delta = [list_to_byte(s[::-1])]
for i in range(1, 128):
s.append(s[i + 2] ^ s[i - 1])
delta.append(list_to_byte(s[i:i + 7][::-1]))
return delta
def subkey_generation(delta, MK):
SK = [None] * 128
for i in range(8):
for j in range(8):
SK[16 * i + j] = (MK[(j - i) % 8] + delta[16 * i + j]) % 256
for j in range(8):
SK[16 * i + j + 8] = (MK[(j - i) % 8 + 8] + delta[16 * i + j + 8]) % 256
return SK
def encryption_key_schedule(MK):
delta = constant_generation()
WK = whitening_key_generation(MK)
SK = subkey_generation(delta, MK)
return WK, SK
def decryption_key_schedule(MK):
delta = constant_generation()
WK = whitening_key_generation(MK)
SK = subkey_generation(delta, MK)[::-1]
return WK, SK
def encryption_initial_transformation(P, WK):
X_0 = [
(P[0] + WK[0]) % 256,
P[1],
P[2] ^ WK[1],
P[3],
(P[4] + WK[2]) % 256,
P[5],
P[6] ^ WK[3],
P[7]
]
return X_0
def decryption_initial_transformation(C, WK):
X_0 = [
C[7],
(C[0] - WK[4]) % 256,
C[1],
C[2] ^ WK[5],
C[3],
(C[4] - WK[6]) % 256,
C[5],
C[6] ^ WK[7]
]
return X_0
def f_0(x):
return rotate_bits(x,1) ^ rotate_bits(x,2) ^ rotate_bits(x,7)
def f_1(x):
return rotate_bits(x,3) ^ rotate_bits(x,4) ^ rotate_bits(x,6)
def encryption_round_function(i, X_i, SK):
X_j = [
X_i[7] ^ ((f_0(X_i[6]) + SK[4 * i + 3]) % 256),
X_i[0],
(X_i[1] + (f_1(X_i[0]) ^ SK[4 * i])) % 256,
X_i[2],
X_i[3] ^ ((f_0(X_i[2]) + SK[4 * i + 1]) % 256),
X_i[4],
(X_i[5] + (f_1(X_i[4]) ^ SK[4 * i + 2])) % 256,
X_i[6]
]
return X_j
def decryption_round_function(i, X_i, SK):
X_j = [
X_i[1],
(X_i[2] - (f_1(X_i[1]) ^ SK[4 * i + 3])) % 256,
X_i[3],
X_i[4] ^ ((f_0(X_i[3]) + SK[4 * i + 2]) % 256),
X_i[5],
(X_i[6] - (f_1(X_i[5]) ^ SK[4 * i + 1])) % 256,
X_i[7],
X_i[0] ^ ((f_0(X_i[7]) + SK[4 * i]) % 256)
]
return X_j
def encryption_final_transformation(X_32, WK):
C = [
(X_32[1] + WK[4]) % 256,
X_32[2],
X_32[3] ^ WK[5],
X_32[4],
(X_32[5] + WK[6]) % 256,
X_32[6],
X_32[7] ^ WK[7],
X_32[0]
]
return C
def decryption_final_transformation(X_32, WK):
D = [
(X_32[0] - WK[0]) % 256,
X_32[1],
X_32[2] ^ WK[1],
X_32[3],
(X_32[4] - WK[2]) % 256,
X_32[5],
X_32[6] ^ WK[3],
X_32[7]
]
return D
def encryption_transformation(P, WK, SK):
X_i = encryption_initial_transformation(P, WK)
for i in range(32):
X_i = encryption_round_function(i, X_i, SK)
C = encryption_final_transformation(X_i, WK)
return C
def decryption_transformation(C, WK, SK):
X_i = decryption_initial_transformation(C, WK)
for i in range(32):
X_i = decryption_round_function(i, X_i, SK)
D = decryption_final_transformation(X_i, WK)
return D
def hight_encryption(P, MK):
WK, SK = encryption_key_schedule(MK)
C = encryption_transformation(P, WK, SK)
return C
def hight_decryption(C, MK):
WK, SK = decryption_key_schedule(MK)
D = decryption_transformation(C, WK, SK)
return D