Smali

0x01 题目描述

都说学好Smali是学习Android逆向的基础，现在刚好有一个smali文件，大家一起分析一下吧~~

0x02 题解

这道题下载下来是一个smali文件，先用smali2java工具将其转换为java文件，具体工具可以谷歌一个自己用的比较顺手的

转换之后的代码如下：

/**
  * Generated by smali2java 1.0.0.558
  * Copyright (C) 2013 Hensence.com
  */

package net.bluelotus.tomorrow.easyandroid;

import android.util.Base64;
import java.io.PrintStream;
import java.security.NoSuchAlgorithmException;
import javax.crypto.NoSuchPaddingException;
import java.security.InvalidKeyException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.BadPaddingException;
import javax.crypto.spec.SecretKeySpec;
import javax.crypto.Cipher;
import java.security.Key;
import java.security.GeneralSecurityException;

public class Crackme {
    private String str2 = "cGhyYWNrICBjdGYgMjAxNg==";
    
    public Crackme() {
        GetFlag("sSNnx1UKbYrA1+MOrdtDTA==");
    }
    
    private String GetFlag(String p1) {
        byte[] "content" = Base64.decode(p1.getBytes(), 0x0);
        String "kk" = new String(Base64.decode(str2.getBytes(), 0x0));
        System.out.println(decrypt("content", "kk"));
        return null;
    }
    
    private String decrypt(byte[] p1, String p2) {
        String "m" = 0x0;
        try {
            byte[] "keyStr" = p2.getBytes();
            SecretKeySpec "key" = new SecretKeySpec("keyStr", "AES");
            Cipher "cipher" = Cipher.getInstance("AES/ECB/NoPadding");
            "cipher".init(0x2, "key");
            byte[] "result" = "cipher".doFinal(p1);
            return "m";
        } catch(NoSuchPaddingException "e") {
            "e".printStackTrace();
        }
        return  "m";
    }
}