C++实现DES加密----算法
我的第一篇博客就是：C语言实现DES加密
今天重写的时候发现好像代码传错了，有些尴尬，其中有各种奇怪的问题…..
问题1.好多表，包括s盒之类的写成char类型了，应该写int类型才对
问题2.好多变量没声明就用了
问题3.为啥我当时要写这么多static???
问题4.没头文件，代码全挤在cpp里面了
更新修复下问题：
C++实现DES加密—-算法篇
test.h
#include test.cpp
#include "test.h"
int main() {
//******************Input*********************
char Char_Key[9] = {0,};
cout << "plz input Char_Key[8]" << endl;
cin >> Char_Key;
char Char_Mingwen[9] = { 0, };
cout << "plz input Char_Mingwen[8]" << endl;
cin >> Char_Mingwen;
//******************Input********************
DES_Key Input_Key(Char_Key);
Des_Run(Char_Mingwen,Input_Key);
system("pause");
return 0;
}
DES_Key::DES_Key(char Char_Key[8]) {
//将char类型的密码转换为Bit形式
CharToBit(Bit_Key, Char_Key);
//置换选择1
Transform(Bit_Key, Bit_Key, PC1_Table, 56);
bool *C0 = &Bit_Key[0]; //0~27
bool *D0 = &Bit_Key[28]; //28~55
for (int i = 0; i < 16; i++) {
RotateL(C0, LOOP_Table[i]);
RotateL(D0, LOOP_Table[i]);
Transform(Round_Key[i], Bit_Key, PC2_Table, 48);
}
}
void Xor(bool *InputA, const bool *InputB, int len) {
for (int i = 0; i < len; i++) {
InputA[i] = InputA[i] ^ InputB[i];
}
}
void CharToBit(bool *Output, const char *Input) {
for (int i = 0; i<64; i++) {
Output[i] = (Input[i / 8] << (i % 8)) & 0x80;
}
}
void Transform(bool *Output, bool *Input, const int *Table, int Tablelen) {
bool temp[256];
for (int i = 0; i < Tablelen; i++) {
temp[i] = Input[Table[i] - 1];
}
memcpy(Output, temp, Tablelen);
}
void RotateL(bool *Input, int len) {
bool temp[28];
memcpy(temp, &Input[len], 28 - len);
memcpy(&temp[28 - len], Input, len);
memcpy(Input, temp, 28);
}
void S_func(bool *Output, bool *Input) {
for (int i = 0; i < 8; i++) {
int row = 2 * Input[6*i] + 1 * Input[6 * i+5];
int col = 8 * Input[6*i+1] + 4 * Input[6 * i+2] + 2 * Input[6 * i+3] + 1 * Input[6 * i+4];
int s_result = S_Box[i][row][col];
for (int j = 0; j < 4; j++) {
Output[4*i+j] = (s_result << j) & 0x8;
}
}
}
void F_func(bool *R, bool *Key) {
bool Ex_R[48];
//扩展置换
Transform(Ex_R, R, E_Table, 48);
Xor(Ex_R, Key, 48);
S_func(R, Ex_R);
Transform(R, R, P_Table, 32);
}
void Des_Run(char *Mingwen, DES_Key DES_Key) {
bool Bit_Mingwen[64];
CharToBit(Bit_Mingwen, Mingwen);
//置换IP
Transform(Bit_Mingwen, Bit_Mingwen, IP_Table, 64);
bool *L0 = &Bit_Mingwen[0];
bool *R0 = &Bit_Mingwen[32];
//16轮迭代
for (int i = 0; i < 16; i++) {
bool temp[32];
memcpy(temp, R0, 32);
F_func(R0, DES_Key.Round_Key[i]);
Xor(R0, L0, 32);
memcpy(L0, temp, 32);
}
bool temp[32];
memcpy(temp, R0, 32);
memcpy(R0, L0, 32);
memcpy(L0, temp, 32);
Transform(Bit_Mingwen, Bit_Mingwen, IPR_Table, 64);
ShowInHex(Bit_Mingwen);
}
void ShowInHex(const bool Input[64]) {
unsigned int Hex[16] = { 0 };
for (int i = 0; i<16; i++) {
Hex[i] = 8 * Input[0 + i * 4] + 4 * Input[1 + i * 4] + 2 * Input[2 + i * 4] + 1 * Input[3 + i * 4];
}
for (int i = 0; i<16; i++) {
cout << hex << Hex[i];
}
cout << endl;
}Windows 10 + vs2017编译通过，测试完全没问题
测试：
秘钥：“security”
明文：“computer”
加密后的密码：“3b6c72b2710eb513”