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TheEasyPeasyTheEasyPeasy
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Packer 1.0 version
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‎README.md‎

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# JavaPacker
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# JavaPacker
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Semester project for studies using GoF design patterns - sometimes they are used by force :D
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## Getting Started
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The goal of the project is to encrypt another JAR executable based on the key provided by the user, save it to a file and create a decryptor and put it into the loader (I used ow2 asm to generate bytecode).
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After launching the program and going through all the steps, you will get the default - output.jar in jar file location (configurable) file which is ready to run. Nothing hard! :)
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## Configuration
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```
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#Mon Jan 11 10:08:37 CET 2021
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useNullByteName=true
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outputPath=output.jar
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fakeDirectory=true
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inputPath=input.jar
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encryptionKey=ABCDEFGHIJKLMNPA
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```
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Property name | expected value | Description
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------------- | ------------- | -------------
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inputPath | Path to input jar file | Define input jar location
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outputPath | Path to output jar file | Define output jar location
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encryptionKey | 16 bytes(length) key | Key used to AES encryption
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useNullByteName | true/false | Method add \u0000 to the beginning of the class name. This method allows you to hide class names and prevent them from unpacking by popular archivers like WinRar
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fakeDirectory | true/false | https://github.com/x4e/fakedirectory - completely unavailable to anyone using WinRAR, Luyten and every other zip viewer.
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## Comments
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Such a packer <b>is not a protection you can rely on</b>. It can only come in handy against total noobs. If you already want to use it somewhere to add extra protection to your application - Please obfuscate the loader.
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Remember that there are tons of ways to get around this - memory dump, defineClass hook, javaagent ... etc
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## Screenshots
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![alt text](https://i.imgur.com/jUrEsd8.png)
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![alt text](https://i.imgur.com/967U67f.png)
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## Credits
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x4e - https://github.com/x4e/fakedirectory

‎pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.example</groupId>
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<artifactId>JavaPacker</artifactId>
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<version>1.0-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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<plugin>
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<artifactId>maven-assembly-plugin</artifactId>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>single</goal>
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</goals>
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</execution>
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</executions>
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<configuration>
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<!-- ... -->
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<archive>
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<manifest>
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<mainClass>me.javapacker.Main</mainClass>
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</manifest>
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</archive>
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<descriptorRefs>
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<descriptorRef>jar-with-dependencies</descriptorRef>
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</descriptorRefs>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
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<dependency>
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<groupId>commons-io</groupId>
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<artifactId>commons-io</artifactId>
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<version>2.8.0</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/org.ow2.asm/asm -->
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<dependency>
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<groupId>org.ow2.asm</groupId>
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<artifactId>asm</artifactId>
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<version>9.0</version>
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</dependency>
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</dependencies>
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</project>

‎src/main/java/me/javapacker/Main.java‎

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package me.javapacker;
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import me.javapacker.app.api.PackerApplication;
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import me.javapacker.app.impl.JavaPacker;
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public class Main {
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public static void main(String[] args)
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{
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new JavaPacker().enableApp();
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}
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}

‎src/main/java/me/javapacker/app/api/PackerApplication.java‎

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package me.javapacker.app.api;
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public abstract class PackerApplication {
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public abstract void enableApp();
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}

‎src/main/java/me/javapacker/app/impl/JavaPacker.java‎

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package me.javapacker.app.impl;
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import me.javapacker.app.api.PackerApplication;
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import me.javapacker.config.PackerConfiguration;
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import me.javapacker.file.api.PackerFilesManager;
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import me.javapacker.file.impl.FactoryPackerFiles;
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import me.javapacker.steps.api.PackerRepository;
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import me.javapacker.steps.api.PackerStep;
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import me.javapacker.steps.impl.*;
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public class JavaPacker extends PackerApplication {
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public static JavaPacker INSTANCE;
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private PackerRepository packerRepository;
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@Override
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public void enableApp() {
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INSTANCE = this;
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try {
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PackerConfiguration.INSTANCE.readConfiguration();
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} catch (Exception e) {
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e.printStackTrace();
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}
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this.packerRepository = new PackerRepositoryImpl();
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final PackerFilesManager packerFilesManager = FactoryPackerFiles.createPackerFilesManager(PackerConfiguration.INSTANCE.getInputPath(), PackerConfiguration.INSTANCE.getOutputPath());
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final PackerStep packerStep = new S01ReadingJar(packerFilesManager);
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packerStep.linkWith(new S02EncryptClasses(packerFilesManager))
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.linkWith(new S03TrashingResource(packerFilesManager))
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.linkWith(new S04SavingKey(packerFilesManager))
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.linkWith(new S05JoinLoader(packerFilesManager))
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.linkWith(new S06AttachManifest(packerFilesManager));
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this.packerRepository.setPackerStep(packerStep);
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this.packerRepository.packApplication();
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}
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}

‎src/main/java/me/javapacker/config/PackerConfiguration.java‎

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package me.javapacker.config;
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import me.javapacker.steps.api.PackerStep;
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import java.io.*;
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import java.util.Properties;
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public class PackerConfiguration {
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public static PackerConfiguration INSTANCE = new PackerConfiguration();
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final Properties properties = new Properties();
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private static String encryptionKey;
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private static String inputPath;
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private static String outputPath;
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private static boolean useNullByteName;
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private static boolean fakeDirectory;
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private PackerConfiguration() { }
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public void readConfiguration() throws Exception {
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final File f = new File("javapacker.properties");
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if(!f.exists())
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{
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properties.setProperty("inputPath", "input.jar");
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properties.setProperty("outputPath", "output.jar");
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properties.setProperty("encryptionKey", "ABCDEFGHIJKLMNPA");
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properties.setProperty("useNullByteName", "true");
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properties.setProperty("fakeDirectory", "true");
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properties.store(new FileOutputStream(f), "");
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}
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loadConfiguration(f);
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}
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private void loadConfiguration(final File f) throws IOException {
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properties.load(new FileInputStream(f));
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inputPath = properties.getProperty("inputPath");
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outputPath = properties.getProperty("outputPath");
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encryptionKey = properties.getProperty("encryptionKey");
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useNullByteName = Boolean.parseBoolean(properties.getProperty("useNullByteName"));
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fakeDirectory = Boolean.parseBoolean(properties.getProperty("fakeDirectory"));
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if(encryptionKey.length() != 16)
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{
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throw new RuntimeException("EncryptionKey length must be 16 bytes!");
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}
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}
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public String getEncryptionKey() {
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return encryptionKey;
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}
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public String getInputPath() {
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return inputPath;
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}
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public String getOutputPath() {
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return outputPath;
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}
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public boolean isUseNullByteName() {
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return useNullByteName;
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}
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public boolean isFakeDirectory() {
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return fakeDirectory;
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}
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}
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‎src/main/java/me/javapacker/file/api/Encryptable.java‎

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package me.javapacker.file.api;
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public interface Encryptable {
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String getEncryptableConfig();
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String getEncryptableFile();
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void setEncryptableConfigName(final String name);
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void setEncryptableFileName(final String name);
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String getEncryptionKey();
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byte[] getEncryptionIV();
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}

‎src/main/java/me/javapacker/file/api/PackerFile.java‎

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package me.javapacker.file.api;
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import java.io.File;
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import java.io.IOException;
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import java.util.jar.JarFile;
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public interface PackerFile {
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File getFile();
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default JarFile asJarFile() throws IOException {
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return new JarFile(getFile());
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}
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String getMainClassName();
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}

‎src/main/java/me/javapacker/file/api/PackerFilesManager.java‎

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package me.javapacker.file.api;
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import java.util.zip.ZipOutputStream;
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public interface PackerFilesManager {
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PackerFile getInputFile();
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PackerFile getOutputFile();
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ZipOutputStream asZipOutputStream();
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Encryptable getEncryptable();
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}

‎src/main/java/me/javapacker/file/impl/EncryptableImpl.java‎

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package me.javapacker.file.impl;
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import me.javapacker.file.api.Encryptable;
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import java.util.Random;
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public class EncryptableImpl implements Encryptable {
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private String encryptableConfig;
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private String encryptableFileName;
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private final String encryptionKey;
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private final byte[] encryptionIV;
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public EncryptableImpl(String encryptionKey) {
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this.encryptionKey = encryptionKey;
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final byte[] iv = new byte[16];
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new Random().nextBytes(iv);
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this.encryptionIV = iv;
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}
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@Override
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public String getEncryptableConfig() {
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return this.encryptableConfig;
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}
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@Override
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public String getEncryptableFile() {
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return this.encryptableFileName;
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}
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@Override
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public void setEncryptableConfigName(String name) {
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this.encryptableConfig = name;
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}
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@Override
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public void setEncryptableFileName(String name) {
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this.encryptableFileName = name;
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}
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@Override
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public String getEncryptionKey() {
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return this.encryptionKey;
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}
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@Override
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public byte[] getEncryptionIV() {
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return this.encryptionIV;
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}
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}

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