【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：