C语言实现密码本

#pragma once
//变量声明
#define NUM 100    //初始密码本容量
extern int g_nNum;    //当前密码本容量
extern int g_lock_flag;  //锁定标志
/* 定义存储账户密码的结构体****************************/
typedef struct _PASSWORD
{
 char website[100]; //站点名
 char userName[40];
 char passWord[20];
 char note[100];//备注
}PASSWORD,*PPASSWORD;
/* 定义用户操作枚举 *************************************/
#define 查看所有密码 1
#define 新增密码  2
#define 删除密码  3
#define 修改密码  4
#define 查询密码  5
#define 解除锁定  6
#define 退出   7

int main()
{
 /*全局变量初始化**********************************************************************/
 g_nNum = 0;      //当前密码本容量
 g_lock_flag = 1;     //锁定标志
 /*局部变量定义 ************************************************************************/
 PPASSWORD pPwd = nullptr;   //密码数组指针
 int nCount = 0;     //当前密码个数
 int op = 0;      //用户操作
 /*本地读取，初始化密码本，锁定标志*****************************************************/
 readInfo(&pPwd, &nCount);
 /*登陆验证==>注册和登陆****************************************************************/
 if (!g_lock_flag)
 {
 printf("账户已锁定，请解锁！\n");
 unLock(pPwd, nCount);
 }
 else
 {
 login(pPwd, &nCount);
 }
 /*循环扫描,功能选择*********************************************************************/
 /*1、查看所有2、新增3、删除4、修改5、查询6、解除锁定7、退出*/
 /*密码校验机制，三次锁定，可以登陆，权限锁定*/
 while (1)
 {
 Dlg_print();
 printf("请输入操作： ");
 scanf_s("%d", &op);
 switch (op)
 {
 case 查看所有密码: searchAllInfo(pPwd,nCount); break;
 case 新增密码:insertInfo(pPwd, &nCount); break;
 case 删除密码:deleInfo(pPwd, &nCount); break;
 case 修改密码:reviseInfo(pPwd, nCount); break;
 case 查询密码:queryInfo(pPwd, nCount); break;
 case 解除锁定:unLock(pPwd, nCount); break;
 case 退出:admExit(pPwd, nCount); break;
 }
 }
 return 0;
}

/*本地读取，初始化密码本*/
void readInfo(PPASSWORD *ppPwd, int *pnCount)
{
 FILE *fp = NULL;
 errno_t err;
 if ((err = fopen_s(&fp,"password.txt", "rb")) != 0)
 {
 //开辟最大容量空间等待输入密码
 printf("文件不存在，请注册账号……\n");
 //密码数组指针为空，给密码数组指针的地址赋值
 *ppPwd = (PPASSWORD)malloc(sizeof(PASSWORD)*NUM);
 memset(*ppPwd, 0, sizeof(PASSWORD)*NUM);
 g_nNum = NUM;
 return;
 }
 fread(pnCount, sizeof(int), 1, fp);
 fread(&g_lock_flag, sizeof(int), 1, fp); 
 g_nNum = *pnCount;
 *ppPwd = (PPASSWORD)malloc(sizeof(PASSWORD)*g_nNum);
 memset(*ppPwd, 0, sizeof(PASSWORD)*g_nNum);
 size_t rlen = fread(*ppPwd, sizeof(PASSWORD), g_nNum, fp);
 /*printf("密码本密码数量：%d\n", *pnCount);
 printf("密码本锁定状态：%d\n", g_lock_flag);
 printf("密码本当前容量：%d\n", g_nNum);*/
 /*解密*/
 if (rlen != g_nNum)
 {
 printf("密码文件读取错误\n");
 fclose(fp);
 return;
 }
 size_t byteSize = sizeof(PASSWORD)*g_nNum;
 char *buf = (char*)*ppPwd;
 for (size_t i = 0; i < byteSize; i++)
 {
 buf[i] = (buf[i]-i)^8;
 }
 fclose(fp);
}
/*保存密码，保存锁定标志*/
void saveInfo(PASSWORD pwd[], int nCount)
{
 FILE *fp = NULL;
 errno_t err;
 if ((err = fopen_s(&fp,"password.txt", "wb+")) != 0)
 {
 printf("打开文件失败\n");
 exit(1);
 }
 fwrite(&nCount, sizeof(int), 1, fp);
 fwrite(&g_lock_flag, sizeof(int), 1, fp);
 /*先加密再存储*/
 size_t byteSize = sizeof(PASSWORD)*nCount;
 char *buf = (char*)malloc(byteSize);
 memcpy_s(buf, byteSize, pwd, byteSize);
 for (size_t i = 0; i < byteSize; i++)
 {
 buf[i] = (buf[i] ^ 8) + i;
 }
 size_t rlen = fwrite(buf, sizeof(PASSWORD), nCount, fp);
 if (rlen != nCount)
 {
 printf("文件写入错误\n");
 }
 else
 {
 printf("保存成功\n");
 }
 fclose(fp);
 system("pause");
 system("cls");
}

void login(PASSWORD pwd[],int *pnCount)
{
 char admName[40] = { 0 };
 char admPwd1[20] = { 0 };
 char admPwd2[20] = { 0 };
 printf("*******************************************\n");
 printf("-------------欢迎使用1024密码本------------\n");
 printf("账户： ");
 scanf_s("%s", admName,40);
 printf("密码： ");
 scanf_s("%s", admPwd1,20);
 if (strlen(pwd[0].userName) == 0||g_nNum == 0)    
 {
 //账户不存在---注册---保存账号密码
 printf("重新输入密码： ");
 scanf_s("%s", admPwd2,20);
 if(strcmp(admPwd1, admPwd2)!=0)
 {
 printf("两次密码不一致，请重新输入\n");
 exit(1);
 }
 strcpy_s(pwd[0].website, 100, "密码本");
 strcpy_s(pwd[0].userName, 40, admName);
 strcpy_s(pwd[0].passWord, 20, admPwd1);
 strcpy_s(pwd[0].note, 100, "管理员账户");
 printf("注册成功\n");
 (*pnCount)++;
 saveInfo(pwd, *pnCount);
 }
 else if (strcmp(admName, pwd[0].userName) == 0)
 {
 // 账户存在,验证密码
 int i = 0;
 while (strcmp(admPwd1, pwd[0].passWord) != 0)
 { 
 i++;
 if (i >= 3)
 {
 g_lock_flag = 0;
 printf("您的账户已被锁定！请解锁后再操作！\n");
 exit(1);
 }
 printf("密码错误，请重新输入: ");
 scanf_s("%s", admPwd1,20);
 }
 }
 else
 {
 printf("账号密码错误\n");
 system("pause");
 exit(1);
 }
}