#include <stdio.h>
void IPchange(int pt[], int IP[])
{
for (int i = 0; i < 64; ++i)
{
pt[i] = pt[IP[i] - 1];
}
}
void IP_1change(int ct[], int IP_1[])
{
for (int i = 0; i < 64; i++)
{
ct[i] = ct[IP_1[i] - 1];
}
}
void PC_1change(int key[], int PC_1[], int C[], int D[])
{
for (int i = 0; i < 56; ++i)
{
key[i] = key[PC_1[i] - 1];
}
for (int j = 0; j < 28; j++)
{
C[j] = key[j];
D[j] = key[28 + j];
}
}
void key_round(int k[16][48], int PC_2[], int C[28], int D[28], int key[], int r)
{
int t_1[2], t_2[2];
t_1[0] = C[0], t_1[1] = C[1], t_2[0] = D[0], t_2[1] = D[1];
if (r == 0 || r == 1 || r == 8 || r == 15)
{
for (int j = 0; j < 27; ++j)
{
C[j] = C[j + 1];
D[j] = D[j + 1];
}
C[27] = t_1[0];
D[27] = t_2[0];
}
else
{
for (int j = 0; j < 26; ++j)
{
C[j] = C[j + 2];
D[j] = D[j + 2];
}
C[26] = t_1[0], C[27] = t_1[1];
D[26] = t_2[0], D[27] = t_2[1];
}
for (int k = 0; k < 28; ++k)
{
key[k] = C[k];
key[k + 28] = D[k];
}
for (int j = 0; j < 48; ++j)
{
k[r][j] = key[PC_2[j] - 1];
}
}
void des_encrypt(int key[], int r, int PC_2[], int f_E[], int f_P[], int R[32], int L[32], int C[], int D[], int k[16][48], int S_box[8][4][16])
{
int ss[8][6], so[8], p[32], tmp[48];
for (int i = 0; i < 48; ++i)
{
tmp[i] = R[f_E[i] - 1];
}
key_round(k, PC_2, C, D, key, r);
for (int j = 0; j < 48; ++j)
{
tmp[j] = tmp[j] ^ k[r][j];
}
for (int u = 0; u < 8; ++u)
{
for (int v = 0; v < 6; ++v)
{
ss[u][v] = tmp[u * 6 + v];
}
}
for (int i = 0; i < 8; ++i)
{
so[i] = S_box[i][ss[i][0] * 2 + ss[i][5]][ss[i][1] * 8 + ss[i][2] * 4 + ss[i][3] * 2 + ss[i][4]];
for (int j = 0; j < 4; ++j)
{
tmp[4 * i + j] = (so[i] >> (3 - j)) & 1;
}
}
for (int i = 0; i < 32; ++i)
{
p[i] = L[i];
}
for (int i = 0; i < 32; ++i)
{
tmp[i] = tmp[f_P[i] - 1];
L[i] = R[i];
R[i] = tmp[i] ^ p[i];
}
}
int main()
{
int pt[64] = { 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0};
int key[64] = { 0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0 };
int IP[64] = { 58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,20,22,14,6,
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 };
int IP_1[64] = { 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 };
int S_box[8][4][16] = { 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 };
int f_E[48] = { 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 };
int f_P[32] = { 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 };
int PC_1[56] = { 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 };
int PC_2[48] = { 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 };
int R[32] = { 0 }, L[32] = { 0 }, C[28]={0}, D[28]={0}, t[32], ct[64], k[16][48];
IPchange(pt, IP);
PC_1change(key, PC_1, C, D);
for (int i = 0; i < 32; ++i)
{
R[i] = pt[i + 32];
L[i] = pt[i];
}
for (int r = 0; r < 16; ++r)
{
des_encrypt(key, r, PC_2, f_E, f_P, R, L, C, D, k, S_box);
}
for (int i = 0; i < 32; ++i)
{
t[i] = R[i];
}
for (int i = 0; i < 32; ++i)
{
R[i] = L[i];
}
for (int i = 0; i < 32; i++)
{
L[i] = t[i];
}
for (int i = 0; i < 32; ++i)
{
ct[i] = L[i];
ct[i + 32] = R[i];
}
IP_1change(ct, IP_1);
for (int i = 0; i < 64; ++i)
{
printf("%d", ct[i]);
}
return 0;
}