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| from textwrap import wrap
import operator
from functools import reduce
KEY = '133457799BBCDFF1' #hexadecimal 8-bit key
INITIAL_PERMUTATION = [
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7,
56, 48, 40, 32, 24, 16, 8, 0,
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6
]
INVERSE_PERMUTATION = [
39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25,
32, 0, 40, 8, 48, 16, 56, 24,
]
SUB_BOX = [
[
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
],
[
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
],
[
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
],
[
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
],
[
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
],
[
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
],
[
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
],
[
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
]
]
EXPANSION = [
31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8,
7, 8, 9, 10, 11, 12,
11, 12, 13, 14, 15, 16,
15, 16, 17, 18, 19, 20,
19, 20, 21, 22, 23, 24,
23, 24, 25, 26, 27, 28,
27, 28, 29, 30, 31, 0
]
PERMUTATION = [
15, 6, 19, 20, 28, 11, 27, 16,
0, 14, 22, 25, 4, 17, 30, 9,
1, 7, 23, 13, 31, 26, 2, 8,
18, 12, 29, 5, 21, 10, 3, 24
]
PERMUTED_CHOICE_1 = [
56, 48, 40, 32, 24, 16, 8,
0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26,
18, 10, 2, 59, 51, 43, 35,
62, 54, 46, 38, 30, 22, 14,
6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28,
20, 12, 4, 27, 19, 11, 3
]
PERMUTED_CHOICE_2 = [
13, 16, 10, 23, 0, 4,
2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7,
15, 6, 26, 19, 12, 1,
40, 51, 30, 36, 46, 54,
29, 39, 50, 44, 32, 47,
43, 48, 38, 55, 33, 52,
45, 41, 49, 35, 28, 31
]
ROTATES = [
1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
]
def slice_mess(string):
"""converts mess from ascii to hex string"""
return [i.zfill(16) for i in wrap(''.join([hex(ord(i))[2:] for i in string]), 16)]
def to_bin(s):
"""converts str to 4-bit slices and fill it zeros if needed"""
return ''.join([bin(int(i, 16))[2:].zfill(4) for i in s])
def permute(block, box):
"""permutes sequence according to permutation tables"""
return ''.join([block[i] for i in box])
def XOR(arg_1, arg_2):
return ''.join([str(int(i) ^ int(j)) for i, j in zip(arg_1, arg_2)])
def rotate_left(block, i):
"""makes C-rotate, coz Py-rotate little not what needed"""
return bin(int(block, 2) << i & 0x0fffffff | int(block, 2) >> 28 - i)[2:].zfill(28)
def concatenate(args):
return reduce(operator.iadd, args, [])
def key_gen(block_1, block_2):
li = []
for i in ROTATES:
block_1 = rotate_left(block_1, i)
block_2 = rotate_left(block_2, i)
li.append(permute(block_1 + block_2, PERMUTED_CHOICE_2))
return li
def f(block, key):
final = []
for j, i in enumerate(wrap(XOR(permute(block, EXPANSION), key), 6)):
temp_box = [
SUB_BOX[j][0:16],
SUB_BOX[j][16:32],
SUB_BOX[j][32:48],
SUB_BOX[j][48:64]
]
# print(temp_box)
final.append(bin(temp_box[int(i[0] + i[-1], 2)]
[int(i[1:-1], 2)])[2:].zfill(4))
return permute(''.join(final), PERMUTATION)
def des(block, key_array):
left, right = block[0: len(block) // 2], block[len(block) // 2:]
for j, i in zip(range(1, 17), key_array):
right, left = XOR(f(right, i), left), right
return wrap(permute(right + left, INVERSE_PERMUTATION), 8)
def main(mess, mod):
if mod == 0:
encrypted_list = []
for i in slice_mess(mess):
bin_mess, bin_key = to_bin(i), to_bin(KEY)
permuted_key, permuted_block = permute(
bin_key, PERMUTED_CHOICE_1), permute(bin_mess, INITIAL_PERMUTATION)
key_list = key_gen(
permuted_key[: len(permuted_key) // 2], permuted_key[len(permuted_key) // 2:])
encrypted_list.append(''.join([hex(int(i, 2))[2:].zfill(
2).upper() for i in des(permuted_block, key_list)]))
print(''.join(encrypted_list))
elif mod == 1:
temp_li = []
final = []
for i in wrap(mess, 16):
bin_mess, bin_key = to_bin(i), to_bin(KEY)
permuted_key, permuted_block = permute(
bin_key, PERMUTED_CHOICE_1), permute(bin_mess, INITIAL_PERMUTATION)
key_list = key_gen(
permuted_key[: len(permuted_key) // 2], permuted_key[len(permuted_key) // 2:])
temp_li.append(''.join([hex(int(i, 2))[2:].zfill(2).upper()
for i in des(permuted_block, reversed(key_list))]))
print(''.join(concatenate(
[[chr(int(j, 16)) for j in wrap(i, 2) if int(j, 16) != 0] for i in temp_li])))
if __name__ == '__main__':
while True:
main(input('Input sentence: '), int(
input('Choose mod (0 - encrypt, 1 - decrypt): '))) |
(
