Smali Javirs

Smali Javirs

下载工具转化为java代码

/**
  * 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";
    }
}

解AES需要导入一个模块（需下载）
ModuleNotFoundError: No module named 'Crypto'

解决方法：

pip install pycryptodome

当然有可能会出现这种情况：看到报错后是这么安装的：pip install crypto

但是运行还是报错：ModuleNotFoundError: No module named 'Crypto'；
此时需要去环境中将安装的包crypto的名字改成Crypto,首字母大写；
然后再次运行，出现这个错误：ModuleNotFoundError: No module named 'Crypto.Cipher'
此时进入到安装的文件夹下，发现没有此文件：
需要卸载刚才安装的包：pip uninstall crypto
然后重新安装：pip install pycryptodome，即可！


b'PCTF{Sm4liRiver}'

import base64
from Crypto.Cipher import AES

key = 'cGhyYWNrICBjdGYgMjAxNg=='
cipher = 'sSNnx1UKbYrA1+MOrdtDTA=='
key = base64.b64decode(key)
cipher = base64.b64decode(cipher)
AES = AES.new(key,AES.MODE_ECB)
print(AES.decrypt(cipher))