置换密码C++实现源码下载

#include "iostream.h" int main() { void encrupt(char *,int *,int); void decrupt(char *,int *,int); cout<<"置换密码演示"<<endl; int n,p; cout<<"输入密钥长度："; cin>>n; int *key=new int[n]; cout<<"输入密钥："; for(int i=0;i<n;i++) cin>>key[i]; int *keyni=new int[n]; for(i=0;i<n;i++) keyni[key[i]-1]=i+1; while(true) { cout<<"如果加密，输入1；如果解密，输入2；否则输入其它数："; cin>>p; if(p!=1 && p!=2) return 0; char message[50]; if(p==1) cout<<"输入明文："; else cout<<"输入密文："; cin>>message; for(i=0;message[i]!=0;i++); while(i%n!=0) message[i++]='?'; message[i]=0; if(p==1) encrupt(message,key,n); else decrupt(message,keyni,n); } delete []key; delete []keyni; return 0; } void encrupt(char *message,int *key,int n) { char transmit[50],k; int j=0; for(int i=0;message[i]!=0;i++) { k=message[key[i%n]-1+i/n*n]; if(k=='?') continue; else transmit[j++]=k; } transmit[j]=0; cout<<"密文为： "<<transmit<<endl; } void decrupt(char *message,int *keyni,int n) { char transmit[50],k; int j=0; for(int i=0;message[i]!=0;i++) { k=message[keyni[i%n]-1+i/n*n]; if(k=='?') continue; else transmit[j++]=k; } transmit[j]=0; cout<<"明文为： "<<transmit<<endl; }