-
Notifications
You must be signed in to change notification settings - Fork 0
/
aes.c
190 lines (154 loc) · 6.22 KB
/
aes.c
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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "aes.h"
#ifdef TBOX
#include "tbox.c"
#endif
static void expand_key(u_int32_t* key, int keylength, u_int32_t (*expkey)[4]);
static void addRoundKey(u_int32_t* expkey, u_int32_t* key);
static void shiftRow(u_int32_t* state);
static void subByte_MixColumn(u_int32_t* state);
static void subByte(u_int32_t* state);
static void print_tbox(void);
u_int32_t rcon[28] = {0x01000000, 0x02000000, 0x04000000, 0x08000000,
0x10000000, 0x20000000, 0x40000000, 0x80000000,
0x1B000000, 0x36000000, 0x6C000000, 0xD8000000,
0xAB000000, 0x4D000000, 0x9A000000, 0x2F000000,
0x5E000000, 0xBC000000, 0x63000000, 0xC6000000,
0x97000000, 0x35000000, 0x6A000000, 0xD4000000,
0xB3000000, 0x7D000000, 0xFA000000, 0xEF000000};
u_int8_t 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
};
#pragma GCC optimize("O0")
void encrypt(u_int32_t* key, int keylength, u_int32_t* msg, u_int32_t* cipher) {
u_int32_t expkey[17][4];
u_int32_t state[4];
u_int8_t Nr, Nk;
Nk = keylength / 32;
Nr = 10 + (Nk - 4);
memcpy(state, msg, 4 * sizeof(u_int32_t));
expand_key(key, keylength, expkey);
#ifdef COUNTER_MEASURES
mask = masking_key(expkey);
mask_tbox = masking_tbox(mask);
#endif
addRoundKey(state, expkey[0]);
for(int i=0; i<(Nr-1); i++) {
shiftRow(state);
subByte_MixColumn(state);
addRoundKey(state, expkey[i+1]);
}
// Last Round
shiftRow(state);
subByte(state);
addRoundKey(state, expkey[Nr]);
memcpy(cipher, state, 4 * sizeof(u_int32_t));
}
void decrypt(u_int32_t* key, u_int32_t* msg, u_int32_t* cipher) {
}
static void expand_key(u_int32_t* key, int keylength, u_int32_t(*expkey)[4]) {
u_int32_t expkey_tmp[4*17];
u_int8_t Nr, Nk;
Nk = keylength / 32;
Nr = 10 + (Nk - 4);
for(int i=0; i<4*(Nr+1); i++) {
if(i<Nk){
expkey_tmp[i] = key[i];
} else if((i >= Nk) && ((i%Nk) == 0)) {
expkey_tmp[i] = Tbox4(ROT_WORD(expkey_tmp[i-1])) ^ rcon[(i/Nk)-1] ^ expkey_tmp[i-Nk];
// Special case for AES 256
} else if((i >= Nk) && (Nk > 6) && ((i%Nk) == 4)) {
expkey_tmp[i] = Tbox4(expkey_tmp[i-1]) ^ expkey_tmp[i-Nk];
} else {
expkey_tmp[i] = expkey_tmp[i-1] ^ expkey_tmp[i-Nk];
}
expkey[i/4][i%4] = expkey_tmp[i];
}
}
static void addRoundKey(u_int32_t* state, u_int32_t* key) {
for(int i=0; i<4; i++) {
state[i] ^= key[i];
}
}
static void shiftRow(u_int32_t* state) {
u_int32_t tmp[4];
memcpy(tmp, state, 4 * sizeof(u_int32_t));
for(int i=0; i<4; i++) {
state[i] = SHIFT_ROW(tmp, i);
}
}
static void subByte_MixColumn(u_int32_t* state) {
// Tbox0...Tbox3 use 8 bits for input and 32 for output
state[0] = Tbox0(BYTE(state[0], 0)) ^ Tbox1(BYTE(state[0], 1)) ^ Tbox2(BYTE(state[0], 2)) ^ Tbox3(BYTE(state[0], 3));
state[1] = Tbox0(BYTE(state[1], 0)) ^ Tbox1(BYTE(state[1], 1)) ^ Tbox2(BYTE(state[1], 2)) ^ Tbox3(BYTE(state[1], 3));
state[2] = Tbox0(BYTE(state[2], 0)) ^ Tbox1(BYTE(state[2], 1)) ^ Tbox2(BYTE(state[2], 2)) ^ Tbox3(BYTE(state[2], 3));
state[3] = Tbox0(BYTE(state[3], 0)) ^ Tbox1(BYTE(state[3], 1)) ^ Tbox2(BYTE(state[3], 2)) ^ Tbox3(BYTE(state[3], 3));
}
static void subByte(u_int32_t* state) {
// Tbox4 uses 32 bits for input and 32 for output
state[0] = Tbox4(state[0]);
state[1] = Tbox4(state[1]);
state[2] = Tbox4(state[2]);
state[3] = Tbox4(state[3]);
}
// Print the matrix 4 x u_int32_t
void print_state(u_int32_t* state) {
for(int toto=0; toto<4; toto++) {
printf("state[%d] = %08x\n", toto, state[toto]);
}
}
// Print The Tbox0 Tbox1 Tbox2 Tbox3 Tbox4
static void print_tbox(void) {
printf("Tbox0[256] = { ");
for(int i=0; i<256; i++) {
printf("%08x, ", Tbox0(i));
}
printf("};\n");
printf("Tbox1[256] = { ");
for(int i=0; i<256; i++) {
printf("%08x, ", Tbox1(i));
}
printf("};\n");
printf("Tbox2[256] = { ");
for(int i=0; i<256; i++) {
printf("%08x, ", Tbox2(i));
}
printf("};\n");
printf("Tbox3[256] = { ");
for(int i=0; i<256; i++) {
printf("%08x, ", Tbox3(i));
}
printf("};\n");
}
static void print_mult(void) {
printf("mult2[256] = { ");
for(int i=0; i<256; i++) {
printf("%02x, \n", mult2(i));
}
printf("};\n");
printf("mult3[256] = { ");
for(int i=0; i<256; i++) {
printf("%02x, \n", mult3(i));
}
printf("};\n");
}
int main(void) {
print_tbox();
}