forked from mrkite/TerraFirma
-
Notifications
You must be signed in to change notification settings - Fork 0
/
aes128.cpp
191 lines (152 loc) · 5.95 KB
/
aes128.cpp
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
165
166
167
168
169
170
171
/**
* Copyright 2015 seancode
*
* Lightweight AES128 decryption. Only supports CBC, only supports 128-bit
* keys, only supports decoding. That's all we need to read terraria
* player files.
*/
#include "./aes128.h"
static const quint8 sbox[256] = {
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 };
static const quint8 isbox[256] = {
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 };
static quint8 xtime(quint8 x) {
return (x << 1) ^ (((x >> 7) & 1) * 0x1b);
}
static quint8 rctime(quint8 rc) {
return (rc << 1) ^ (((rc >> 7) & 1) * 0x11b);
}
static quint8 M(quint8 x, quint8 y) {
return ((y & 1) * x) ^
(((y >> 1) & 1) * xtime(x)) ^
(((y >> 2) & 1) * xtime(xtime(x))) ^
(((y >> 3) & 1) * xtime(xtime(xtime(x)))) ^
(((y >> 4) & 1) * xtime(xtime(xtime(xtime(x)))));
}
QByteArray AES128::decrypt(QByteArray input, QByteArray key, QByteArray iv) {
quint8 roundKey[176];
for (int i = 0; i < 16; i++)
roundKey[i] = key[i];
quint8 t;
quint8 temp[4];
for (quint8 j = 16, rc = 1; j < 176; j += 4) {
for (int i = 0; i < 4; i++)
temp[i] = roundKey[j - (4 - i)];
if (j % 16 == 0) {
t = temp[0];
temp[0] = sbox[temp[1]] ^ rc;
temp[1] = sbox[temp[2]];
temp[2] = sbox[temp[3]];
temp[3] = sbox[t];
rc = rctime(rc);
}
roundKey[j] = roundKey[j - 16] ^ temp[0];
roundKey[j + 1] = roundKey[j - 15] ^ temp[1];
roundKey[j + 2] = roundKey[j - 14] ^ temp[2];
roundKey[j + 3] = roundKey[j - 13] ^ temp[3];
}
QByteArray out = input;
for (int i = 0; i < input.length(); i += 16) {
for (int j = 0; j < 16; j++)
out[i + j] = out[i + j] ^ roundKey[10 * 16 + j];
for (int round = 9; round >= 0; round--) {
t = out[i + 13];
out[i + 13] = out[i + 9];
out[i + 9] = out[i + 5];
out[i + 5] = out[i + 1];
out[i + 1] = t;
t = out[i + 2];
out[i + 2] = out[i + 10];
out[i + 10] = t;
t = out[i + 3];
out[i + 3] = out[i + 7];
out[i + 7] = out[i + 11];
out[i + 11] = out[i + 15];
out[i + 15] = t;
t = out[i + 6];
out[i + 6] = out[i + 14];
out[i + 14] = t;
for (int j = 0; j < 16; j++)
out[i + j] = isbox[(quint8)out[i + j]] ^ roundKey[round * 16 + j];
if (round) {
quint8 a, b, c, d;
for (int j = 0; j < 4; j++) {
a = out[i + j * 4 + 0];
b = out[i + j * 4 + 1];
c = out[i + j * 4 + 2];
d = out[i + j * 4 + 3];
out[i + j * 4 + 0] = M(a, 0xe) ^ M(b, 0xb) ^ M(c, 0xd) ^ M(d, 0x9);
out[i + j * 4 + 1] = M(a, 0x9) ^ M(b, 0xe) ^ M(c, 0xb) ^ M(d, 0xd);
out[i + j * 4 + 2] = M(a, 0xd) ^ M(b, 0x9) ^ M(c, 0xe) ^ M(d, 0xb);
out[i + j * 4 + 3] = M(a, 0xb) ^ M(b, 0xd) ^ M(c, 0x9) ^ M(d, 0xe);
}
}
}
for (int j = 0; j < 16; j++)
out[i + j] = out[i + j] ^ iv[j];
iv = input.mid(i, 16);
}
return out;
}