BUUCTF Reverse Java逆向解密(划水)

BUUCTF Reverse Java逆向解密(划水)

得到class文件我直接拖进idea了

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//

import java.util.ArrayList;
import java.util.Scanner;

public class Reverse {
    public Reverse() {
    }

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.println("Please input the flag ：");
        String str = s.next();
        System.out.println("Your input is ：");
        System.out.println(str);
        char[] stringArr = str.toCharArray();
        Encrypt(stringArr);
    }

    public static void Encrypt(char[] arr) {
        ArrayList Resultlist = new ArrayList();

        for(int i = 0; i < arr.length; ++i) {
            int result = arr[i] + 64 ^ 32;
            Resultlist.add(result);
        }

        int[] KEY = new int[]{180, 136, 137, 147, 191, 137, 147, 191, 148, 136, 133, 191, 134, 140, 129, 135, 191, 65};
        ArrayList KEYList = new ArrayList();

        for(int j = 0; j < KEY.length; ++j) {
            KEYList.add(KEY[j]);
        }

        System.out.println("Result:");
        if (Resultlist.equals(KEYList)) {
            System.out.println("Congratulations！");
        } else {
            System.err.println("Error！");
        }

    }
}

写逆向脚本

target = [180, 136, 137, 147, 191, 137, 147, 191, 148, 136, 133, 191, 134, 140, 129, 135, 191, 65]
str = ''
for i in range(len(target)):
    inter = target[i] - 64 ^ 32
    str += chr(inter)
print(str)

第一次的时候不知道它们的运算优先级写成这样了
inter = target[i] - (64 ^ 32)
得到的结果自然也是错误的