标签：11 10 课程设计 12 15 -- 13 bool 密码学
// DES（C++）.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
#include<iostream>
#include<string.h>
using namespace std;
char m[1000] = { 0 }; //明文 //DES明文每组64个比特，即八个字符
char c[1000] = { 0 }; //密文
char m1[1000] = { 0 };
char k[1000];
int block = 0;
bool SubKey[16][48]; //定义子密钥，使得所有函数都能调用 ,16轮子密钥 //由输入进去的初始密钥，迭代形成的
const static char IP_Table[64] = { //定义IP置换表
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 };
const static char IPInv_Table[64] = { //定义IP逆置换表
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 };
static const char E_Table[48] = { //定义E扩展表
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 };
static const char P_Table[32] = { //定义P置换表
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 };
static const char PC1_Table[56] = { //定义PC1置换表
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 };
static const char PC2_Table[48] = { //定义PC2置换表
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 };
static const char LS_Table[16] = { //定义左移位数表
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1 };
static const char S_Box[8][4][16] = { //S盒，一共八个S盒，四行，16列
//S1
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,
//S2
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,
//S3
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,
//S4
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,
//S5
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,
//S6
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,
//S7
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,
//S8
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 };
void Des_Run(char Out[8], char In[8], bool flag); //Des加解密
void Des_SetSubKey(char Key[8]); //生成子密钥
void F_Func(bool In[32], bool Ki[48]); //轮函数f
void S_Func(bool Out[32], bool In[48]); //s盒交换
void Transform(bool* Out, bool* In, const char* Table, int len); //表置换
void Xor(bool* InA, bool* InB, int len); //异或运算
void RotateL(bool* In, int len, int loop); //循环左移运算
void ByteToBit(bool* Out, const char* In, int bits); //字符转bit
void HalfByteToBit(bool* Out, const char* In, int bits); //半字符转bit
void BitToByte(char* Out, const bool* In, int bits); //bit转字符
void ByteToBit(bool* Out, const char* In, int bits)//字符转bit，将字符数组In转化为bool数组Out，bits控制转换bit数
{
for (int i = 0; i < bits; i++)
Out[i] = (In[i / 8] >> (7 - i % 8)) & 1;
}
void HalfByteToBit(bool* Out, const char* In, int bits)//半字符转bit，将半字符数组In(4 bit)转化为bool数组Out
{
for (int i = 0; i < bits; i++)
Out[i] = (In[i / 4] >> (3 - i % 4)) & 1;
}
void BitToByte(char* Out, const bool* In, int bits)//bit转字符，将bool数组In转化为字符数组Out
{
memset(Out, 0, bits / 8);
for (int i = 0; i < bits; i++)
Out[i / 8] = (In[i] << (7 - i % 8)) + Out[i / 8];
}
void Transform(bool* Out, bool* In, const char* Table, int len) //表置换，利用置换表Table将bool数组In转换成长度为len的bool数组Out
{
bool Temp[256]; //临时数组长度定义成足够大的即可
for (int i = 0; i < len; i++)
Temp[i] = In[Table[i] - 1];
memcpy(Out, Temp, len);
}
void RotateL(bool* In, int len, int loop) //循环左移运算，对长度为len的bool数组In循环左移loop位
{
static bool Temp[256];
memcpy(Temp, In, loop);
memcpy(In, In + loop, len - loop);
memcpy(In + (len - loop), Temp, loop);
}
void Des_SetSubKey(char Key[8]) //生成子密钥，利用初始密钥Key生成16轮子密钥SubKey，//注意前文已定义static bool SubKey[16][48];
{
static bool K[64];
static bool* KL = &K[0];
static bool* KR = &K[28];
ByteToBit(K, Key, 64);
Transform(K, K, PC1_Table, 56);
for (int i = 0; i < 16; i++)
{
RotateL(KL, 28, LS_Table[i]);
RotateL(KR, 28, LS_Table[i]);
Transform(SubKey[i], K, PC2_Table, 48);
}
}
void Xor(bool* InA, bool* InB, int len) //异或运算，将bool数组InB与InA逐位做异或，结果存入InA
{
for (int i = 0; i < len; i++)
{
InA[i] = InB[i] ^ InA[i];
}
}
void S_Func(bool Out[32], bool In[48]) //s盒交换，利用S盒S_Box将bool数组In转换为bool数组Out
{
for (char i = 0, j, k; i < 8; i++) //分成8组
{
j = (In[0 + 6 * i] << 1) + In[5 + 6 * i];
k = (In[1 + 6 * i] << 3) + (In[2 + 6 * i] << 2) + (In[3 + 6 * i] << 1) + In[4 + 6 * i];
HalfByteToBit(Out + 4*i, &S_Box[i][j][k], 4); //将0-15的数字，转换成二进制。即四个比特
}
}
void F_Func(bool In[32], bool Ki[48]) //轮函数f，利用子密钥Ki对bool数组In做轮变换函数，结果仍存入In
{
static bool MR[48];
Transform(MR, In, E_Table, 48);
Xor(MR, Ki, 48);
S_Func(In, MR);
Transform(In, In, P_Table, 32);
}
void Des_Run(char Out[8],char In[8], bool flag) //Des加解密：输入字符数组In，输出字符数组Out，//flag = 1时代表加密，flag = 0时代表解密。
{
static bool M[64];
static bool Temp[32];
static bool* Li = &M[0];
static bool* Ri = &M[32];
ByteToBit(M, In, 64);
if (flag)
{
Transform(M, M, IP_Table, 64);
for (int i = 0; i < 16; i++) //加解密区别
{
memcpy(Temp, Ri, 32);
F_Func(Ri, SubKey[i]);
Xor(Ri, Li, 32);
memcpy(Li, Temp, 32);
}
memcpy(Temp, Li, 32);
memcpy(Li, Ri, 32);
memcpy(Ri, Temp, 32);//交换Li和Ri
Transform(M, M, IPInv_Table, 64);
}
else
{
Transform(M, M, IP_Table, 64);
for (int i = 15; i >= 0; i--) //加解密区别
{
memcpy(Temp, Ri, 32);
F_Func(Ri, SubKey[i]);
Xor(Ri, Li, 32);
memcpy(Li, Temp, 32);
}
memcpy(Temp, Li, 32);
memcpy(Li, Ri, 32);
memcpy(Ri, Temp, 32);//交换Li和Ri
Transform(M, M, IPInv_Table, 64);
}
BitToByte(Out, M, 64); //bit转换成字符输出
}
//解密
void decryption() //解密
{
//分组解密
char m_block[8] = { 0 };
char c_block[8] = { 0 };
for (int i = 0; i < block; i++)
{
for (int j = 0; j < 8; j++)
c_block[j] = c[8 * i + j];
Des_Run(m_block, c_block, 0);
for (int j = 0; j < 8; j++)
m1[8 * i + j] = m_block[j];
}
//显示解密文
cout << "解密文：" << endl;
cout<< m1 << endl;
}
void encryption() //加密
{
//读入明文并记录长度
int size=0;
cout << "请输入明文:" << endl;
cin.get(m,1000);
cout << endl;
//size= strlen((char*)m);
size=strlen(m);
block = (size - 1) / 8 + 1;
//读入密钥并设置子密钥
cout << "请输入密钥：" << endl;
cin >> k;
cout << endl;
Des_SetSubKey(k);
//分组加密
char m_block[8] = { 0 };
char c_block[8] = { 0 };
for (int i = 0; i < block-1; i++)
{
for (int j = 0; j < 8; j++)
m_block[j] = m[8 * i+j];
Des_Run(c_block, m_block, 1);
for (int j=0; j < 8; j++)
c[8*i+j]=c_block[j];
}
//最后一组进行填充并加密
for (int j = 0; j < 8; j++)
m_block[j] = 0;
for (int j = 0; j < (size - 1) % 8 + 1; j++)
m_block[j]=m[8 * (block - 1) + j];
Des_Run(c_block, m_block, 1);
for (int j = 0; j < 8; j++)
c[8 * (block-1) + j] = c_block[j];
//显示密文
cout << "密文为：" << endl;
cout <<c<<endl;
}
int main()
{
encryption();
decryption();
return 0;
}
标签：11,10,课程设计,12,15,--,13,bool,密码学 来源： https://blog.csdn.net/Shahahaha_/article/details/116465526
本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享； 2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关； 3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关； 4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除； 5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。