-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathAES.py
More file actions
156 lines (127 loc) · 7.69 KB
/
AES.py
File metadata and controls
156 lines (127 loc) · 7.69 KB
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
import numpy as np
class AES:
S_BOX = [
# 0 1 2 3 4 5 6 7 8 9 A B C D E F
[0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76],
[0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0],
[0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15],
[0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75],
[0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84],
[0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf],
[0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8],
[0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2],
[0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73],
[0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb],
[0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79],
[0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08],
[0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a],
[0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e],
[0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf],
[0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16]
]
INV_S_BOX = [
[0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb],
[0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb],
[0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e],
[0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25],
[0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92],
[0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84],
[0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06],
[0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b],
[0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73],
[0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e],
[0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b],
[0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4],
[0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f],
[0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef],
[0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61],
[0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d]
]
RCON = [0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36]
def __init__(self, key):
self.key = np.array(list(key.encode())).reshape(4, 4)
self.round_keys = self.key_expansion(self.key)
def key_expansion(self, key):
expanded_key = key.copy()
for i in range(4, 44):
temp = expanded_key[:, i - 1]
if i % 4 == 0:
temp = np.roll(temp, -1) # Rotate left
temp = np.array([self.S_BOX[b >> 4][b & 0x0F] for b in temp]) # Apply S-Box
temp[0] ^= self.RCON[i // 4] # XOR with RCON
expanded_key = np.column_stack((expanded_key, expanded_key[:, i - 4] ^ temp))
return expanded_key.reshape(11, 4, 4)
def sub_bytes(self, state):
return np.array([[self.S_BOX[b >> 4][b & 0x0F] for b in row] for row in state])
def inv_sub_bytes(self, state):
return np.array([[self.INV_S_BOX[b >> 4][b & 0x0F] for b in row] for row in state])
def shift_rows(self, state):
return np.array([np.roll(row, -i) for i, row in enumerate(state)])
def inv_shift_rows(self, state):
return np.array([np.roll(row, i) for i, row in enumerate(state)])
def mix_columns(self, state):
mix_matrix = np.array([[0x02, 0x03, 0x01, 0x01],
[0x01, 0x02, 0x03, 0x01],
[0x01, 0x01, 0x02, 0x03],
[0x03, 0x01, 0x01, 0x02]])
return self.galois_mult(mix_matrix, state)
def inv_mix_columns(self, state):
inv_mix_matrix = np.array([[0x0E, 0x0B, 0x0D, 0x09],
[0x09, 0x0E, 0x0B, 0x0D],
[0x0D, 0x09, 0x0E, 0x0B],
[0x0B, 0x0D, 0x09, 0x0E]])
return self.galois_mult(inv_mix_matrix, state)
def galois_mult(self, matrix, state):
result = np.zeros((4, 4), dtype=np.uint8)
for i in range(4):
for j in range(4):
result[i, j] = (self.gf_mul(matrix[i, 0], state[0, j]) ^
self.gf_mul(matrix[i, 1], state[1, j]) ^
self.gf_mul(matrix[i, 2], state[2, j]) ^
self.gf_mul(matrix[i, 3], state[3, j]))
return result
def gf_mul(self, a, b):
result = 0
for _ in range(8):
if b & 1:
result ^= a
high_bit_set = a & 0x80
a = (a << 1) & 0xFF
if high_bit_set:
a ^= 0x1B
b >>= 1
return result
def add_round_key(self, state, round_key):
return state ^ round_key
def encrypt(self, plaintext):
state = np.array(list(plaintext.encode())).reshape(4, 4)
state = self.add_round_key(state, self.round_keys[0])
for round in range(1, 10):
state = self.sub_bytes(state)
state = self.shift_rows(state)
state = self.mix_columns(state)
state = self.add_round_key(state, self.round_keys[round])
state = self.sub_bytes(state)
state = self.shift_rows(state)
state = self.add_round_key(state, self.round_keys[10])
return state.flatten().tolist()
def decrypt(self, ciphertext):
state = np.array(ciphertext).reshape(4, 4)
state = self.add_round_key(state, self.round_keys[10])
for round in range(9, 0, -1):
state = self.inv_shift_rows(state)
state = self.inv_sub_bytes(state)
state = self.add_round_key(state, self.round_keys[round])
state = self.inv_mix_columns(state)
state = self.inv_shift_rows(state)
state = self.inv_sub_bytes(state)
state = self.add_round_key(state, self.round_keys[0])
return "".join([chr(b) for b in state.flatten()])
if __name__ == "__main__":
key = input("Enter a 128-bit key (16 characters): ")
plaintext = input("Enter plaintext (16 characters): ")
aes = AES(key)
ciphertext = aes.encrypt(plaintext)
print(f"Ciphertext: {ciphertext}")
decrypted_text = aes.decrypt(ciphertext)
print(f"Decrypted Text: {decrypted_text}")