cake.apk

一般情况下就是开始源码分析，再结合smali代码

查看特征

从入口函数中的onCreate开始分析

1.开始分析关键check方法

2.测试代码

破解idea：https://www.cnblogs.com/horvey/p/12247079.html

package com.company;
public class Main {
    public static String getKey() {
        return "bobdylan";
    }
    public static void main(String[] args) {
        int i = 0;
        String str2 = getKey();
        int[] iArr = new int[16];
        iArr[0] = 0;
        iArr[12] = 14;
        iArr[10] = 7;
        iArr[14] = 15;
        iArr[15] = 42;
        try {
            iArr[1] = 3;
            iArr[5] = 5;
            System.out.println();
        } catch (Exception e2) {
            iArr[5] = 37;
            iArr[1] = 85;
        }
        iArr[6] = 15;
        iArr[2] = 13;
        iArr[3] = 19;
        iArr[11] = 68;
        iArr[4] = 85;
        iArr[13] = 5;
        iArr[9] = 7;
        iArr[7] = 78;
        iArr[8] = 22;
        char pass[] = new char[16];
        for (int j = 0;j< 16 ;j++) {
            char ch = str2.charAt(j % str2.length());
            char ch1=(char)(iArr[j]& 255);
            pass[j]=(char)(ch1 ^ ch);
        }
        System.out.println(pass);
    }
}