Question

我正在创建一个以文件为输入的程序＆amp;输出每行的解密密码。该文件包含三行加密密码。我保证密码解密为4个字母的单词。鉴于我已经创建了字母的char []。我使用LOW LEVEL IO逐行读取文件并将生成的密码放在新文件中时遇到问题。任何＆amp;所有建议表示赞赏！

到目前为止，这是我的代码：

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#define BUFFER_SIZE 1024

int main(void)
{

   int f = open("pass.txt", O_RDONLY);
   if (f < 0) 
      return 0;
   char buf[1024];
   while (my_fgets(buf, sizeof(buf), f)) 
      printf("%s\n", buf);
   close(f);
   const char *const pass = "$1$6gMKIopE$I.zkP2EvrXHDmApzYoV.B.";
   char *result;
   int ok;
   char guess[] = {'a','a','a','a','\0'};
   char ch1=guess[0], ch2=guess[1], ch3=guess[2], ch4=guess[3];
   do{
      for(ch1; ch1<='z';++ch1)
      {
         for(ch2='a';ch2<='z';++ch2)
         {
            for(ch3='a';ch3<='z';++ch3)
            {
               for(ch4='a';ch4<='z';++ch4)
               {
                  result = crypt(guess, pass);               
               }

            }
         }     
      }
   }while(strcmp(result, pass) != 0);
   puts(guess);
   return 0;
}

int my_fgets(char* buf, int len, int f)
{
   for (int i = 0; i < len; i++,buf++)
   {
      int count = read(f, buf, 1);
      if (!count || (buf[0] == '\n'))
      {
         buf[0] = 0;
         return i;
      }
   }
   return 0;
}

文字档案：

$1$6gMKIopE$I.zkP2EvrXHDmApzYoV.B.
$1$pkMKIcvE$WQfqzTNmcQr7fqsNq7K2p0
$1$0lMKIuvE$7mOnlu6RZ/cUFRBidK7PK.

Answer 1

以下代码块似乎存在缺陷：

ch1

这样做只保留最后一行。其他行被读取并丢弃。

此外，还不清楚do ... while循环的每次迭代中应该如何初始化for(ch1; ch1<='z';++ch1) // ^^^。你有它：

ch1

这不会初始化void decryptPassword(char* buf) { printf("%s\n", buf); const char *const pass = "$1$6gMKIopE$I.zkP2EvrXHDmApzYoV.B."; char *result; int ok; char guess[] = {'a','a','a','a','\0'}; char ch1=guess[0], ch2=guess[1], ch3=guess[2], ch4=guess[3]; do{ for(ch1; ch1<='z';++ch1) { for(ch2='a';ch2<='z';++ch2) { for(ch3='a';ch3<='z';++ch3) { for(ch4='a';ch4<='z';++ch4) { result = crypt(guess, pass); } } } } }while(strcmp(result, pass) != 0); puts(guess); } int main(void) { int f = open("soc.in", O_RDONLY); if (f < 0) return 0; char buf[1024]; while (my_fgets(buf, sizeof(buf), f)) decryptPassword(buf); close(f); return 0; }。这是一种没有副作用的表达。

我建议将大部分密码解密逻辑放在自己的函数中，并在读完每一行后调用该函数。

public MainForm()
    {
        InitializeComponent();
        display();

        network = new Network(this);

        btn = new Button();

    }

private void btnClick(object sender, EventArgs e)
    {

        btn = (Button)sender;

        if (btn.Name == "button1")
        {
            col = 1;
            row = 1;

        }
        else if(btn.Name == "button2"){
            col = 2;
            row = 1;

        }else if(btn.Name == "button3"){
            col = 3;
            row = 1;

        }else if(btn.Name == "button4"){
            col = 1;
            row = 2;

        }else if(btn.Name == "button5"){
            col = 2;
            row = 2;

        }else if(btn.Name == "button6"){
            col = 3;
            row = 2;

        }else if(btn.Name == "button7"){
            col = 1;
            row = 3;

        }else if(btn.Name == "button8"){
            col = 2;
            row = 3;
        }
        else if (btn.Name == "button9")
        {
            col = 3;
            row = 3;
        }


        MakeMove(row, col);

    }

public void MakeMove(int row, int col){

        if ((statusBar.Text == "Connecting...") ||
            (statusBar.Text == "Waiting for connection..."))
            return;


        //_____________________________________________________________________________________________
        //
        // Move network move
        //_____________________________________________________________________________________________
        //wServer = true;

        //MessageBox.Show("wServer is: " + wServer);
        if (((wServer == true) && (turn == true) && (isNetworkPlay == false)) ||
             ((wClient == true) && (turn == false) && (isNetworkPlay == false)))
        {
            //MessageBox.Show("retgr");
            network.SendMove(row, col);
        }
        else
        {
            if (((wServer == true) && (turn == false) && (isNetworkPlay == false)) ||
                ((wClient == true) && (turn == true) && (isNetworkPlay == false)))
                return;
        }

        //checks whos turn it is and sets the button to X or O
        //THIS IS WHERE I AM HAVING TROUBLE
        if (!turn)
        {
            //btn.Text = "X";

            SetControlPropertyValue(btn, "Text", "X");


        }
        else
        {
            //btn.Text = "O";
            SetControlPropertyValue(btn, "Text", "O");

        }

        turn = !turn;
        //btn.Enabled = false;
        SetControlPropertyValue(btn, "Enabled", false);

        turnCount++;

        //checks who wins
        checkWinner();

        display();


        isNetworkPlay = false;
    }![enter image description here][2]

非常简单的加密程序错误

1 个答案: