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test3.cpp
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//
// Created by 李文博 on 2018-12-21.
//
#include <iostream>
#include <cstdio>
#include <fstream>
#include <string>
#include <cstring>
#include "common.h"
using namespace std;
int IP[64]={58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,30,22,14,6,
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 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 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 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 S[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,
3,15,0,6,10,1,13,8,9,4,5,11,12,74,2,14,
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};
union plaintext{
struct{
char m8 :1;
char m7 :1;
char m6 :1;
char m5 :1;
char m4 :1;
char m3 :1;
char m2 :1;
char m1 :1;
}bit[8];
unsigned int num[2];
}plaint;
/*
L0
long8[0](long4[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,
R0
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,long8[63](long4[1][31]),
*/
union{
int long4[2][32];
int long8[64];
}middle,middle_backup;
int key[64]={1,0,1,0,1,0,1,0,
1,0,1,0,1,0,1,0,
1,0,1,0,1,0,1,0,
1,0,1,1,1,1,1,0,
1,0,1,0,1,0,1,0,
1,0,1,0,1,0,1,0,
1,0,1,1,1,0,1,0,
1,0,1,0,1,0,1,0};
union{
int long28[2][28];
int long56[56];
}CD,CD_backup;
union{
int long48[48];
}K[16];
union{
int long48[48];
int long6[8][6];
}Extend_E;
union{
int long32[32];
int long4[8][4];
}FP,FP_backup;
void show_lfsr(int i){
if(plaint.bit[i].m8)cout<<1;
else cout<<0;
if(plaint.bit[i].m7)cout<<1;
else cout<<0;
if(plaint.bit[i].m6)cout<<1;
else cout<<0;
if(plaint.bit[i].m5)cout<<1;
else cout<<0;
if(plaint.bit[i].m4)cout<<1;
else cout<<0;
if(plaint.bit[i].m3)cout<<1;
else cout<<0;
if(plaint.bit[i].m2)cout<<1;
else cout<<0;
if(plaint.bit[i].m1)cout<<1;
else cout<<0;
}
void plaint2middle(){
for(int i=0;i<2;i++){
for(int j=31;j>=0;j--){
middle.long4[i][j] = plaint.num[i] & 0x1;
plaint.num[i]>>=1;
}
}
}
void middle2plaint(){
for(int i=0;i<2;i++){
plaint.num[i] = 0;
for(int j=0;j<32;j++){
plaint.num[i] = plaint.num[i] | middle.long4[i][j];
if(j==31)break;
plaint.num[i]<<=1;
}
}
}
//IP置换函数
void op_IP(int *IP){
memcpy((void*)&middle_backup, (void*)&middle, sizeof(middle));
for(int i=0;i<64;i++){
middle.long8[i] = middle_backup.long8[IP[i]-1];
}
}
//int型的多位异或
void op_xor(int *a, int *b, int length){
for(int i=0;i<length;i++){
a[i] ^= b[i];
}
}
//PC-1
void op_pc_1(){
//memcpy((void*)&CD_backup, (void*)&CD, sizeof(CD));
for(int i = 0;i<56;i++){
CD.long56[i] = key[PC_1[i]-1];
}
};
//LSi
void op_ls(int *head,int length, int num){
for(int i=0;i<num;i++){
int temp = head[0];
for(int j = 0;j<length-1;j++){
head[j] = head[j+1];
}
head[length-1] = temp;
}
}
//PC-2
void op_pc_2(int ki){
for(int i = 0;i<48;i++){
K[ki].long48[i] = CD.long56[PC_2[i]-1];
}
}
//产生16个k
void gener_k(){
op_pc_1();
for(int i=0;i<16;i++){
//LS
if(i==0|i==1|i==8|i==15){
op_ls(CD.long28[0],28,1);
op_ls(CD.long28[1],28,1);
}
else{
op_ls(CD.long28[0],28,2);
op_ls(CD.long28[1],28,2);
}
//PC-2
op_pc_2(i);
}
}
//选择函数E 32扩展48
void op_E(){
for(int i = 0;i<48;i++){
Extend_E.long48[i] = middle_backup.long4[1][E[i]-1];
}
}
void encrypt_f(int ki){
op_xor(Extend_E.long48, K[ki].long48, 48);
for(int i = 0;i<8;i++){
int temp = S[i][ Extend_E.long6[i][0]*2 + Extend_E.long6[i][5] ][ Extend_E.long6[i][1]*8 + Extend_E.long6[i][2]*4 + Extend_E.long6[i][3]*2 + Extend_E.long6[i][4]];
FP.long4[i][3] = temp % 2;
temp /= 2;
FP.long4[i][2] = temp % 2;
temp /= 2;
FP.long4[i][1] = temp % 2;
temp /= 2;
FP.long4[i][0] = temp % 2;
}
//置换P
memcpy((void*)&FP_backup, (void*)&FP, sizeof(CD));
for(int i = 0;i < 32;i++){
FP.long32[i] = FP_backup.long32[P[i]-1];
}
}
//圈函数
void round_fun(int ki){
memcpy((void*)&middle_backup, (void*)&middle, sizeof(middle));
//Li = Ri - 1
memcpy((void*)&middle.long4[0], (void*)&middle_backup.long4[1], sizeof(middle)/2);
op_E();
encrypt_f(ki);
//Ri = Li-1 ^ f( Ri-1 , Ki )
op_xor(middle_backup.long4[0], FP.long32, 32);
memcpy((void*)&middle.long4[1], (void*)&middle_backup.long4[0], sizeof(middle)/2);
}
void encrypt(){
op_IP(IP);
for(int i = 0;i<16;i++){
round_fun(i);
}
memcpy((void*)&middle_backup, (void*)&middle, sizeof(middle));
memcpy((void*)&middle.long4[0], (void*)&middle_backup.long4[1], sizeof(middle)/2);
memcpy((void*)&middle.long4[1], (void*)&middle_backup.long4[0], sizeof(middle)/2);
op_IP(IP_1);
}
void decrypt(){
op_IP(IP);
for(int i = 15;i>=0;i--){
round_fun(i);
}
memcpy((void*)&middle_backup, (void*)&middle, sizeof(middle));
memcpy((void*)&middle.long4[0], (void*)&middle_backup.long4[1], sizeof(middle)/2);
memcpy((void*)&middle.long4[1], (void*)&middle_backup.long4[0], sizeof(middle)/2);
op_IP(IP_1);
}
int main(){
gener_k();
//加密
ifstream file;
file.open("data/3/text.txt",ios::in);
ofstream ofile;
ofile.open("data/3/encrypt.txt",ios::out);
while(!file.eof()) {
file.read((char *) &plaint, sizeof(plaint));
if(file.eof())break;
plaint2middle();
decrypt();
middle2plaint();
ofile.write((char *) &plaint, sizeof(plaint));
}
ofile.close();
file.close();
//解密
file.open("data/3/encrypt.txt",ios::in);
ofile.open("data/3/answer.txt",ios::out);
while(!file.eof()) {
file.read((char *) &plaint, sizeof(plaint));
if(file.eof())break;
plaint2middle();
encrypt();
middle2plaint();
ofile.write((char *) &plaint, sizeof(plaint));
}
ofile.close();
file.close();
return 0;
}