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SBox.py
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from ciphers.utils import *
class SBox:
def __init__(self, table: dict, block_size=4, func=lambda binary: (binary[0] + binary[5], binary[1:5])):
self.table = table
self.block_size = block_size
self.func = func
def __call__(self, binary: str) -> str:
a, b = self.func(binary)
a, b = int(a, base=2), int(b, base=2)
if (a, b) in self.table:
return int_to_bin(self.table[(a, b)], block_size=self.block_size)
else:
return binary
@staticmethod
def des_single_round_substitutions():
return [SBox.forDESSubstitution(block) for block in range(1, 9)]
@staticmethod
def identity():
return SBox(func=lambda binary: ('0', '0'), table={})
@staticmethod
def forDESSubstitution(block):
if block == 1: return SBox.des_s_box1()
if block == 2: return SBox.des_s_box2()
if block == 3: return SBox.des_s_box3()
if block == 4: return SBox.des_s_box4()
if block == 5: return SBox.des_s_box5()
if block == 6: return SBox.des_s_box6()
if block == 7: return SBox.des_s_box7()
if block == 8: return SBox.des_s_box8()
@staticmethod
def des_confusion(binary: str) -> tuple:
""""Takes a 6-bit binary string as input and returns a 4-bit binary string as output"""
return binary[0] + binary[5], binary[1: 5]
@staticmethod
def from_list(sequence: list):
mapping = {}
for row in range(len(sequence)):
for column in range(len(sequence[0])):
mapping[(row, column)] = sequence[row][column]
return SBox(table=mapping)
@staticmethod
def des_s_box1():
return SBox.from_list(
[[14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7],
[0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8],
[4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0],
[15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13]]
)
@staticmethod
def des_s_box2():
return SBox.from_list(
[[15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10],
[3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5],
[0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15],
[13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9]]
)
@staticmethod
def des_s_box3():
return SBox.from_list(
[[10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8],
[13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1],
[13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7],
[1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12]]
)
@staticmethod
def des_s_box4():
return SBox.from_list(
[[7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15],
[13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9],
[10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4],
[3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14]]
)
@staticmethod
def des_s_box5():
return SBox.from_list(
[[2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9],
[14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6],
[4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14],
[11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3]]
)
@staticmethod
def des_s_box6():
return SBox.from_list(
[[12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11],
[10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8],
[9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6],
[4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13]]
)
@staticmethod
def des_s_box7():
return SBox.from_list(
[[4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1],
[13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6],
[1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2],
[6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12]]
)
@staticmethod
def des_s_box8():
return SBox.from_list(
[[13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7],
[1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2],
[7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8],
[2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11]]
)