《攻防世界》MOBILE--app1

HNHuangJingYU

1. 将app1.apk拉进JEB分析发现题目很简单，就是java层的分析，简单的分析下，就是我们输入的字符串长度要等于versionName的长度、然后就是字符串逐个字符要等于versionName.charAt(v0) ^ v4)、那么就好办了。

[Java] 纯文本查看 复制代码

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this.btn.setOnClickListener(new View$OnClickListener() {             public void onClick(View arg10) {                 try {                     String v1 = MainActivity.this.text.getText().toString();                     PackageInfo v2 = MainActivity.this.getPackageManager().getPackageInfo("com.example.yaphetshan.tencentgreat", 0x4000);                     String v3 = v2.versionName;                     int v4 = v2.versionCode;                     int v0 = 0;                     while(v0 < v1.length()) {                         if(v0 >= v3.length()) {                             break;                         }                           if(v1.charAt(v0) != (v3.charAt(v0) ^ v4)) {                             Toast.makeText(MainActivity.this, "再接再厉，加油~", 1).show();                             return;                         }                         else {                             ++v0;                             continue;                         }                     }                       if(v1.length() != v3.length()) {                         goto label_39;                     }                       Toast.makeText(MainActivity.this, "恭喜开启闯关之门！", 1).show();                     return;                 }                 catch(PackageManager$NameNotFoundException v5) {                 }               label_39:                 Toast.makeText(MainActivity.this, "年轻人不要耍小聪明噢", 1).show();             }         });

2.将versionName.charAt(v0) ^ v4 的值输出，因为输出的值都是int值，所以需要进行对ASCLL码转换

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@Test public void demo2() {     String versionName = "X<cP[?PHNB<P?aj";     int versionCode = 15;     for (int i = 0; i < versionName.length(); i++) {         System.out.print((char) (versionName.charAt(i) ^ versionCode));     }     //输出：W3l_T0_GAM3_0ne }

州哥在江湖

感谢楼主分享，学习学习。