1 #include<stdio.h>
2 void Sub_Bytes();
3 void Shift_Rows();
4 void Mix_Columns();
5 unsigned char Gf_256(unsigned char a,unsigned char b);
6 void Add_Round_Key();
7 void Key_Expansion(int time);
8
9
10 unsigned char sBox[256] = //S-box
11 { /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
12 /*0*/ 0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,
13 /*1*/ 0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,
14 /*2*/ 0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,
15 /*3*/ 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,
16 /*4*/ 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,
17 /*5*/ 0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,
18 /*6*/ 0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,
19 /*7*/ 0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,
20 /*8*/ 0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,
21 /*9*/ 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,
22 /*a*/ 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,
23 /*b*/ 0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,
24 /*c*/ 0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,
25 /*d*/ 0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,
26 /*e*/ 0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,
27 /*f*/ 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16
28 };
29
30
31 unsigned char state[4][4] = //明文
32 {
33 0x32,0x88,0x31,0xe0,
34 0x43,0x5a,0x31,0x37,
35 0xf6,0x30,0x98,0x07,
36 0xa8,0x8d,0xa2,0x34
37 };
38
39
40 unsigned char cipher_key[4][4] = //密钥
41 {
42 0x2b,0x28,0xab,0x09,
43 0x7e,0xae,0xf7,0xcf,
44 0x15,0xd2,0x15,0x4f,
45 0x16,0xa6,0x88,0x3c
46 };
47
48
49 unsigned char Rcon[4][10] = //轮常量
50 {
51 0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36,
52 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
53 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
54 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
55 };
56
57
58 int main()
59 { int i,j,t;
60 for(i=0;i<4;i++) //打印明文
61 {
62 for(j=0;j<4;j++)
63 {
64 printf("%x ",state[i][j]);
65 }
66 printf("\n");
67 }
68 printf("\n");
69
70 Add_Round_Key(); //Round 0
71
72 for(t=0;t<9;t++) //Round 1-9
73 {
74 Sub_Bytes();
75 Shift_Rows();
76 Mix_Columns();
77 Key_Expansion(t);
78 Add_Round_Key();
79 }
80
81 Sub_Bytes(); //Round 10
82 Shift_Rows();
83 Key_Expansion(t);
84 Add_Round_Key();
85
86 for(i=0;i<4;i++)
87 {
88 for(j=0;j<4;j++)
89 {
90 printf("%x ",state[i][j]);
91 }
92 printf("\n");
93 }
94 return 0;
95 }
96
97
98 void Sub_Bytes() //字节替换
99 {
100 int i,j;
101 for(i=0;i<4;i++)
102 {
103 for(j=0;j<4;j++)
104 {
105 state[i][j]=sBox[state[i][j]];
106 }
107 }
108 }
109
110
111 void Shift_Rows() //行移位变换
112 {
113 int i,j;
114 unsigned char temp[4];
115 for(i=1;i<4;i++)
116 {
117 for(j=0;j<4;j++)
118 {
119 temp[j]=state[i][j];
120 }
121 for(j=0;j<4;j++)
122 {
123 state[i][j]=temp[(j+i)%4];
124 }
125 }
126 }
127
128
129 void Mix_Columns() //列混淆变换
130 {
131 int i,j;
132 unsigned char temp[4];
133 for(j=0;j<4;j++)
134 {
135 for(i=0;i<4;i++)
136 {
137 temp[i]=state[i][j];
138 }
139 for(i=0;i<4;i++)
140 {
141 state[i][j]=Gf_256(0x02,temp[i])^Gf_256(0x03,temp[(1+i)%4])^Gf_256(0x01,temp[(2+i)%4])^Gf_256(0x01,temp[(3+i)%4]);
142 }
143 }
144 }
145
146
147 unsigned char Gf_256(unsigned char a,unsigned char b) //有限域GF(28)上的乘法
148 {
149 unsigned char temp[3];
150 unsigned char res;
151 temp[0]=b; //temp[0]=0x01*b
152 temp[1]=b<<1; //temp[1]=0x02*b
153 if(b&0x80) //0x80=1000 0000
154 {
155 temp[1]=temp[1]^0x1b;
156 }
157 temp[2]=temp[0]^temp[1]; //temp[2]=0x03*b
158 if(a==0x01) {res=temp[0];}
159 if(a==0x02) {res=temp[1];}
160 if(a==0x03) {res=temp[2];}
161 return res;
162 }
163
164
165 void Add_Round_Key() //轮密钥加变换
166 {
167 int i,j;
168 for(j=0;j<4;j++)
169 {
170 for(i=0;i<4;i++)
171 {
172 state[i][j]=state[i][j]^cipher_key[i][j];
173 }
174 }
175 }
176
177
178 void Key_Expansion(int time) //aes-128为11组纶密钥，第0组为输入密钥本身
179 {
180 int i,j;
181 unsigned char temp[4];
182 for(i=0;i<4;i++) //取出最后一列，同时循环左移一个字节
183 {
184 temp[i]=cipher_key[(i+1)%4][3];
185 }
186 for(i=0;i<4;i++) //取出的一列进行subbytes
187 {
188 temp[i]=sBox[temp[i]];
189 }
190 for(i=0;i<4;i++) //生成下一组密钥第一列
191 {
192 cipher_key[i][0]=cipher_key[i][0]^temp[i]^Rcon[i][time];
193 }
194 for(j=1;j<4;j++) //生成下一组密钥的234列
195 {
196 for(i=0;i<4;i++)
197 {
198 cipher_key[i][j]=cipher_key[i][j]^cipher_key[i][j-1];
199 }
200 }
201 }
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