Guess-the-Number进阶区

最新推荐文章于 2023-10-30 19:01:30 发布

Carrie_Sec

最新推荐文章于 2023-10-30 19:01:30 发布

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分类专栏： re题目

本文链接：https://blog.youkuaiyun.com/m0_46357566/article/details/107548645

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本文介绍了如何通过jd-gui进行反汇编来深入理解Guess-the-Number游戏，同时在IDEA中简化代码，将if-else逻辑移除，并将my_number和guess_number初始化为0，以实现游戏的简化版本并运行体验。

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1.利用jd-gui进行反汇编

import java.math.BigInteger;

public class guess {
  static String XOR(String _str_one, String _str_two) {
    BigInteger i1 = new BigInteger(_str_one, 16);
    BigInteger i2 = new BigInteger(_str_two, 16);
    BigInteger res = i1.xor(i2);
    String result = res.toString(16);
    return result;
  }
  
  public static void main(String[] args) {
    int guess_number = 0;
    int my_num = 349763335;
    int my_number = 1545686892;
    int flag = 345736730;
    if (args.length > 0) {
      try {
        guess_number = Integer.parseInt(args[0]);
        if (my_number / 5 == guess_number) {
          String str_one = "4b64ca12ace755516c178f72d05d7061";
          String str_two = "ecd44646cfe5994ebeb35bf922e25dba";
          my_num += flag;
          String answer = XOR(str_one, str_two);
          System.out.println("your flag is: " + answer);
        } else {
          System.err.println("wrong guess!");
          System.exit(1);
        } 
      } catch (NumberFormatException e) {
        System.err.println("please enter an integer \nexample: java -jar guess 12");
        System.exit(1);
      } 
    } else {
      System.err.println("wrong guess!");
      int num = 1000000;
      num++;
      System.exit(1);
    } 
  }
}

2.用IDEA打开，把if-else语句去掉，my_number和guess_number改为0


    import java.math.BigInteger;

     class guess {
        static String XOR(String _str_one, String _str_two) {
            BigInteger i1 = new BigInteger(_str_one, 16);
            BigInteger i2 = new BigInteger(_str_two, 16);
            BigInteger res = i1.xor(i2);
            String result = res.toString(16);
            return result;
        }

        public static void main(String[] args) {
            int guess_number = 0;
            int my_num = 0;//349763335;
            int my_number = 1545686892;
            int flag = 345736730;
           // if (args.length > 0) {
                try {
                   // guess_number = Integer.parseInt(args[0]);

                        String str_one = "4b64ca12ace755516c178f72d05d7061";
                        String str_two = "ecd44646cfe5994ebeb35bf922e25dba";
                        my_num += flag;
                        String answer = XOR(str_one, str_two);
                        System.out.println("your flag is: " + answer);


                } catch (NumberFormatException e) {
                    System.err.println("please enter an integer \nexample: java -jar guess 12");
                    System.exit(1);
                }
           // } else {
             //   System.err.println("wrong guess!");
             //   int num = 1000000;
              //  num++;
              //  System.exit(1);
           // }
        }
    }

3.运行得到
在这里插入图片描述