-
Notifications
You must be signed in to change notification settings - Fork 0
/
des_full.py
164 lines (142 loc) · 6.37 KB
/
des_full.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
# -*- coding: utf-8 -*-
"""
Created on Mon Nov 28 17:11:34 2020
@author: edala
"""
def hex2bin(s):
mp = {'0' : "0000",'1' : "0001",'2' : "0010",'3' : "0011",'4' : "0100",'5' : "0101",'6' : "0110",'7' : "0111",'8' : "1000",'9' : "1001",'A' : "1010",'B' : "1011",'C' : "1100",'D' : "1101",'E' : "1110",'F' : "1111" }
bin = ""
for i in range(len(s)):
bin = bin + mp[s[i]]
return bin
def bin2hex(s):
mp = {"0000" : '0',"0001" : '1',"0010" : '2',"0011" : '3',"0100" : '4',"0101" : '5',"0110" : '6',"0111" : '7',"1000" : '8',"1001" : '9',"1010" : 'A',"1011" : 'B',"1100" : 'C',"1101" : 'D',"1110" : 'E',"1111" : 'F' }
hex = ""
for i in range(0,len(s),4):
ch = ""
ch = ch + s[i]
ch = ch + s[i + 1]
ch = ch + s[i + 2]
ch = ch + s[i + 3]
hex = hex + mp[ch]
return hex
def bin2dec(binary):
binary1 = binary
decimal, i, n = 0, 0, 0
while(binary != 0):
dec = binary % 10
decimal = decimal + dec * pow(2, i)
binary = binary//10
i += 1
return decimal
def dec2bin(num):
res = bin(num).replace("0b", "")
if(len(res)%4 != 0):
div = len(res) / 4
div = int(div)
counter =(4 * (div + 1)) - len(res)
for i in range(0, counter):
res = '0' + res
return res
def permute(k, arr, n):
permutation = ""
for i in range(0, n):
permutation = permutation + k[arr[i] - 1]
return permutation
def shift_left(k, nth_shifts):
s = ""
for i in range(nth_shifts):
for j in range(1,len(k)):
s = s + k[j]
s = s + k[0]
k = s
s = ""
return k
def xor(a, b):
ans = ""
for i in range(len(a)):
if a[i] == b[i]:
ans = ans + "0"
else:
ans = ans + "1"
return ans
initial_perm = [58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, 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]
exp_d = [32, 1 , 2 , 3 , 4 , 5 , 4 , 5, 6, 7, 8, 9, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1 ]
per = [ 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25 ]
sbox = [[[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] ] ]
final_perm = [ 40, 8, 48, 16, 56, 24, 64, 32, 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 ]
def encrypt(pt, rkb, rk):
pt = hex2bin(pt)
pt = permute(pt, initial_perm, 64)
print("After inital permutation", bin2hex(pt))
left = pt[0:32]
right = pt[32:64]
for i in range(0, 16):
right_expanded = permute(right, exp_d, 48)
xor_x = xor(right_expanded, rkb[i])
sbox_str = ""
for j in range(0, 8):
row = bin2dec(int(xor_x[j * 6] + xor_x[j * 6 + 5]))
col = bin2dec(int(xor_x[j * 6 + 1] + xor_x[j * 6 + 2] + xor_x[j * 6 + 3] + xor_x[j * 6 + 4]))
val = sbox[j][row][col]
sbox_str = sbox_str + dec2bin(val)
sbox_str = permute(sbox_str, per, 32)
result = xor(left, sbox_str)
left = result
if(i != 15):
left, right = right, left
print("Round ", i + 1, " ", bin2hex(left), " ", bin2hex(right), " ", rk[i])
combine = left + right
cipher_text = permute(combine, final_perm, 64)
return cipher_text
def decryption(ciphertext, key):
key = hex2bin(key)
keyp = [57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36, 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 ]
key = permute(key, keyp, 56)
shift_table = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 ]
key_comp = [14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 ]
left = key[0:28]
right = key[28:56]
rkb = []
rk = []
for i in range(0, 16):
left = shift_left(left, shift_table[i])
right = shift_left(right, shift_table[i])
combine_str = left + right
round_key = permute(combine_str, key_comp, 48)
rkb.append(round_key)
rk.append(bin2hex(round_key))
rkb_rev = rkb[::-1]
rk_rev = rk[::-1]
return bin2hex(encrypt(ciphertext, rkb_rev, rk_rev))