package?com.example.reforceapk;

import?java.io.ByteArrayOutputStream;
import?java.io.File;
import?java.io.FileInputStream;
import?java.io.FileOutputStream;
import?java.io.IOException;
import?java.security.MessageDigest;
import?java.security.NoSuchAlgorithmException;
import?java.util.zip.Adler32;


public?class?mymain?{
	/**
	?*?@param?args
	?*/
	public?static?void?main（String[]?args）?{
		//?TODO?Auto-generated?method?stub
		try?{
			File?payloadSrcFile?=?new?File（“force/ForceApkObj.apk“）;???//需要加殼的程序
			System.out.println（“apk?size:“+payloadSrcFile.length（））;
			File?unShellDexFile?=?new?File（“force/ForceApkObj.dex“）;	//解客dex
			byte[]?payloadArray?=?encrpt（readFileBytes（payloadSrcFile））;//以二進制形式讀出apk，并進行加密處理//對源Apk進行加密操作
			byte[]?unShellDexArray?=?readFileBytes（unShellDexFile）;//以二進制形式讀出dex
			int?payloadLen?=?payloadArray.length;
			int?unShellDexLen?=?unShellDexArray.length;
			int?totalLen?=?payloadLen?+?unShellDexLen?+4;//多出4字節是存放長度的。
			byte[]?newdex?=?new?byte[totalLen];?//?申請了新的長度
			//添加解殼代碼
			System.arraycopy（unShellDexArray?0?newdex?0?unShellDexLen）;//先拷貝dex內容
			//添加加密后的解殼數據
			System.arraycopy（payloadArray?0?newdex?unShellDexLen?payloadLen）;//再在dex內容后面拷貝apk的內容
			//添加解殼數據長度
			System.arraycopy（intToByte（payloadLen）?0?newdex?totalLen-4?4）;//最后4為長度
????????????//修改DEX?file?size文件頭
			fixFileSizeHeader（newdex）;
			//修改DEX?SHA1?文件頭
			fixSHA1Header（newdex）;
			//修改DEX?CheckSum文件頭
			fixCheckSumHeader（newdex）;

			String?str?=?“force/classes.dex“;
			File?file?=?new?File（str）;
			if?（!file.exists（））?{
				file.createNewFile（）;
			}
			
			FileOutputStream?localFileOutputStream?=?new?FileOutputStream（str）;
			localFileOutputStream.write（newdex）;
			localFileOutputStream.flush（）;
			localFileOutputStream.close（）;


		}?catch?（Exception?e）?{
			e.printStackTrace（）;
		}
	}
	
	//直接返回數據，讀者可以添加自己加密方法
	private?static?byte[]?encrpt（byte[]?srcdata）{
		for（int?i?=?0;i			srcdata[i]?=?（byte）（0xFF?^?srcdata[i]）;
		}
		return?srcdata;
	}

	/**
	?*?修改dex頭，CheckSum?校驗碼
	?*?@param?dexBytes
	?*/
	private?static?void?fixCheckSumHeader（byte[]?dexBytes）?{
		Adler32?adler?=?new?Adler32（）;
		adler.update（dexBytes?12?dexBytes.length?-?12）;//從12到文件末尾計算校驗碼
		long?value?=?adler.getValue（）;
		int?va?=?（int）?value;
		byte[]?newcs?=?intToByte（va）;
		//高位在前，低位在前掉個個
		byte[]?recs?=?new?byte[4];
		for?（int?i?=?0;?i?			recs[i]?=?newcs[newcs.length?-?1?-?i];
			System.out.println（Integer.toHexString（newcs[i]））;
		}
		System.arraycopy（recs?0?dexBytes?8?4）;//效驗碼賦值（8-11）
		System.out.println（Long.toHexString（value））;
		System.out.println（）;
	}


	/**
	?*?int?轉byte[]
	?*?@param?number
	?*?@return
	?*/
	public?static?byte[]?intToByte（int?number）?{
		byte[]?b?=?new?byte[4];
		for?（int?i?=?3;?i?>=?0;?i--）?{
			b[i]?=?（byte）?（number?%?256）;
			number?>>=?8;
		}
		return?b;
	}

	/**
	?*?修改dex頭?sha1值
	?*?@param?dexBytes
	?*?@t

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-03-22?16:39??AndroidJG\
?????目錄???????????0??2015-09-13?12:47??AndroidJG\DexShellTools\
?????文件?????????301??2015-08-27?15:06??AndroidJG\DexShellTools\.classpath
?????文件?????????389??2015-08-27?17:15??AndroidJG\DexShellTools\.project
?????目錄???????????0??2015-09-13?12:47??AndroidJG\DexShellTools\.settings\
?????文件?????????598??2015-08-27?15:06??AndroidJG\DexShellTools\.settings\org.eclipse.jdt.core.prefs
?????目錄???????????0??2016-03-22?15:46??AndroidJG\DexShellTools\bin\
?????目錄???????????0??2016-03-22?15:46??AndroidJG\DexShellTools\bin\com\
?????目錄???????????0??2016-03-22?15:46??AndroidJG\DexShellTools\bin\com\example\
?????目錄???????????0??2016-03-22?15:46??AndroidJG\DexShellTools\bin\com\example\reforceapk\
?????文件????????4396??2016-03-22?15:46??AndroidJG\DexShellTools\bin\com\example\reforceapk\mymain.class
?????目錄???????????0??2016-03-22?16:36??AndroidJG\DexShellTools\force\
?????文件?????1150562??2016-03-22?16:36??AndroidJG\DexShellTools\force\classes.dex
?????文件??????321798??2016-03-22?16:35??AndroidJG\DexShellTools\force\ForceApkObj.apk
?????文件??????828760??2016-03-22?16:35??AndroidJG\DexShellTools\force\ForceApkObj.dex
?????目錄???????????0??2015-09-13?12:47??AndroidJG\DexShellTools\src\
?????目錄???????????0??2015-09-13?12:47??AndroidJG\DexShellTools\src\com\
?????目錄???????????0??2015-09-13?12:47??AndroidJG\DexShellTools\src\com\example\
?????目錄???????????0??2015-09-13?12:47??AndroidJG\DexShellTools\src\com\example\reforceapk\
?????文件????????4823??2015-09-08?09:48??AndroidJG\DexShellTools\src\com\example\reforceapk\mymain.java
?????目錄???????????0??2016-03-22?15:46??AndroidJG\ForceApkObj\
?????文件?????????475??2016-03-22?15:46??AndroidJG\ForceApkObj\.classpath
?????文件?????????847??2015-08-27?15:07??AndroidJG\ForceApkObj\.project
?????目錄???????????0??2016-03-22?15:46??AndroidJG\ForceApkObj\.settings\
?????文件?????????177??2016-03-22?15:46??AndroidJG\ForceApkObj\.settings\org.eclipse.jdt.core.prefs
?????文件?????????892??2015-08-28?09:59??AndroidJG\ForceApkObj\AndroidManifest.xml
?????目錄???????????0??2015-08-27?15:07??AndroidJG\ForceApkObj\assets\
?????目錄???????????0??2016-03-22?16:35??AndroidJG\ForceApkObj\bin\
?????文件?????????892??2016-03-22?16:35??AndroidJG\ForceApkObj\bin\AndroidManifest.xml
?????目錄???????????0??2016-03-22?16:35??AndroidJG\ForceApkObj\bin\classes\
?????文件??????817684??2016-03-22?16:35??AndroidJG\ForceApkObj\bin\classes.dex
............此處省略270個文件信息