实现字符串的加密与解密

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define USERNAME admin
#define PASSWORD admin
#define KEY 5
char * Encrypt(char password[]);  //加密
char * DeEncrypt(char password[]);  //解密

int main()
{
   char name[50];
   printf("请输入您的密码:");
   fgets(name,40,stdin);
   printf("加密后的密码是:%s",Encrypt(name));

   printf("\n解密后的密码是:%s",DeEncrypt(name));


    return 0;
}


char * Encrypt(char password[])
{
    int count;
    int i=0;
    count = strlen(password);
    for(;i<count;i++)
    {
         password[i] = password[i] +i +KEY;
    }
    return password;
}

char * DeEncrypt(char password[])
{
    int count;
    int i=0;
    count = strlen(password);
    for(;i<count;i++)
    {
         password[i] = password[i] -i -KEY;
    }
    return password;
}