【Agorithm】一次一密加密解密算法

 #include<iostream>

 #include<cstdio>

 #include<cstdlib>

 #include<ctime>

 #include<cmath>

 #include<cstring>

 #include<string>

 #include<windows.h>

 #define MAX 100

 using namespace std;

 char key[MAX];

 int len;

 char *bitcode(char *str){

     char *wen;

     if((wen = (char*)malloc(len+))==NULL){

         cout<<"申请内存失败！"<<endl;

         exit();

     }

     for(int i=; i<len; i++){

         wen[i] = str[i]^key[i];

     }

     wen[len] = '\0';

     return wen;

 }

 int main(){

     char str[MAX];

     char *miwen, *mingwen;

     char again;

     srand(time(NULL));

     cout<<"\t\t\t\t一次一密加密算法演示！\n\n";

     s1:

         cout<<"请输入需要加密的明文字符串：";

         fflush(stdin);

         gets(str);

         len = strlen(str);

         for(int i=; i<len; i++){

             key[i] = rand()%+'';

         }

         cout<<"此次加密的密钥序列为：";

         for(int i=; i<len; i++){

             cout<<key[i];

         }

         cout<<endl;

         miwen = bitcode(str);

         cout<<"加密前的明文为：";

         cout<<str<<endl;

         cout<<"加密后的密文为："<<miwen<<endl;

         mingwen = bitcode(miwen);

         cout<<"解密后的明文为："<<mingwen<<endl;

         cout<<endl;

     s2:

         cout<<"继续执行 （Y/N）？";

         fflush(stdin);

         cin>>again;

         if(again =='y'|| again =='Y'){

             goto s1;

         }

         else if(again == 'n' || again == 'N'){

             cout<<"演示结束！"<<endl;

             return ;

         }

         else{

             cout<<"输入错误请重新输入！"<<endl;

             goto s2;

         }

         system("pause");

 }

以下是运行结果：