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‎.gitattributes

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# Auto detect text files and perform LF normalization
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* text=auto

‎.gitignore

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.idea/*
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*.iml
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META-INF/*
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target/*
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out/*
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# Compiled class file
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*.class
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# Log file
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*.log
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# BlueJ files
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*.ctxt
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# Mobile Tools for Java (J2ME)
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.mtj.tmp/
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# Package Files #
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*.jar
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*.war
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*.nar
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*.ear
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*.zip
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*.tar.gz
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*.rar
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*

‎LICENSE

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MIT License
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Copyright (c) [year] [fullname]
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎README.md

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# Bozar
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A Java bytecode obfuscator with GUI
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![alt text](https://image.prntscr.com/image/GGDP-02JT-egDPFl_3L2xg.png)
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## Usage
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* Download the version you want in [releases](https://github.com/vimasig/Bozar/releases) for your platform
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* Extract contents from the ZIP. <sub><sup>(That's not required by most ZIP tools)</sup></sub>
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* Run the executable.
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* Done.
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Let me know if obfuscator fails. Submit an [issue](https://github.com/vimasig/Bozar/issues) here.
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## Currently Available Obfuscation Options
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* Constant obfuscation <sub><sup>(String literals and numbers)</sup></sub>
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* Line number obfuscation
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* Local variable obfuscation
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* Source file/debug remover
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## Command Line Arguments
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| Command | Description |
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| --- | --- |
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| `-input` | Target file path to obfuscate. |
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| `-output` | Output path. |
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| `-config` | Configuration path. |
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| `-console` | Application will run without GUI and obfuscation task will be started immediately. |

‎pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" 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/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.vimasig</groupId>
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<artifactId>Bozar</artifactId>
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<version>1.0.0</version>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>14</maven.compiler.source>
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<maven.compiler.target>14</maven.compiler.target>
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</properties>
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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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<version>3.8.0</version>
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<configuration>
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<release>14</release>
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<source>14</source>
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<target>14</target>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.openjfx</groupId>
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<artifactId>javafx-maven-plugin</artifactId>
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<version>0.0.5</version>
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<configuration>
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<mainClass>com.vimasig.bozar.ui.App</mainClass>
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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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<dependency>
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<groupId>org.openjfx</groupId>
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<artifactId>javafx-controls</artifactId>
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<version>13</version>
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</dependency>
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<dependency>
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<groupId>org.openjfx</groupId>
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<artifactId>javafx-fxml</artifactId>
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<version>13</version>
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</dependency>
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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>9.1</version>
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</dependency>
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<dependency>
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<groupId>org.ow2.asm</groupId>
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<artifactId>asm-tree</artifactId>
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<version>9.1</version>
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</dependency>
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<dependency>
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<groupId>org.ow2.asm</groupId>
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<artifactId>asm-commons</artifactId>
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<version>9.1</version>
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</dependency>
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<dependency>
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<groupId>com.google.code.gson</groupId>
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<artifactId>gson</artifactId>
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<version>2.8.6</version>
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</dependency>
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<dependency>
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<groupId>commons-cli</groupId>
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<artifactId>commons-cli</artifactId>
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<version>1.4</version>
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</dependency>
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</dependencies>
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</project>

‎src/main/java/com/vimasig/bozar/obfuscator/Bozar.java

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package com.vimasig.bozar.obfuscator;
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import com.vimasig.bozar.obfuscator.transformer.TransformManager;
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import com.vimasig.bozar.obfuscator.utils.StreamUtils;
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import com.vimasig.bozar.obfuscator.utils.model.BozarConfig;
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import com.vimasig.bozar.obfuscator.utils.model.BozarMessage;
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import com.vimasig.bozar.obfuscator.utils.model.CustomClassWriter;
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import com.vimasig.bozar.obfuscator.utils.model.ResourceWrapper;
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import org.objectweb.asm.ClassReader;
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import org.objectweb.asm.ClassWriter;
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import org.objectweb.asm.tree.ClassNode;
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import java.io.ByteArrayInputStream;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.jar.JarEntry;
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import java.util.jar.JarOutputStream;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipInputStream;
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public class Bozar implements Runnable {
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private final File input;
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private final Path output;
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private final BozarConfig config;
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public Bozar(File input, Path output, BozarConfig config) {
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this.input = input;
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this.output = output;
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this.config = config;
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}
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private final List<ClassNode> classes = new ArrayList<>();
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private final List<ResourceWrapper> resources = new ArrayList<>();
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@Override
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public void run() {
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try {
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// Input file checks
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if(!this.input.exists())
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throw new FileNotFoundException("Cannot find input");
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if(!this.input.isFile())
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throw new IllegalArgumentException("Received input is not a file");
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String inputExtension = this.input.getName().substring(this.input.getName().lastIndexOf(".") + 1).toLowerCase();
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switch (inputExtension) {
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case "jar" -> {
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// Read JAR input
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log("Processing JAR input...");
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try (var jarInputStream = new ZipInputStream(Files.newInputStream(input.toPath()))) {
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ZipEntry zipEntry;
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while ((zipEntry = jarInputStream.getNextEntry()) != null) {
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if (zipEntry.getName().endsWith(".class")) {
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ClassReader reader = new ClassReader(jarInputStream);
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ClassNode classNode = new ClassNode();
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reader.accept(classNode, 0);
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classes.add(classNode);
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} else resources.add(new ResourceWrapper(zipEntry, StreamUtils.readAll(jarInputStream)));
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}
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}
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}
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default -> throw new IllegalArgumentException("Unsupported file extension: " + inputExtension);
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}
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// Empty/corrupted file check
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if(classes.size() == 0)
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throw new IllegalArgumentException("Received input does not look like a proper JAR file");
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// Transform
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log("Transforming...");
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var transformHandler = new TransformManager(this);
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transformHandler.transform();
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// Write output
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log("Writing...");
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try (var out = new JarOutputStream(Files.newOutputStream(this.output))) {
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// Write resources
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resources.forEach(resourceWrapper -> {
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try {
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out.putNextEntry(new JarEntry(resourceWrapper.getZipEntry().getName()));
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StreamUtils.copy(new ByteArrayInputStream(resourceWrapper.getBytes()), out);
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} catch (IOException e) {
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e.printStackTrace();
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}
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});
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// Convert string library paths to URL array
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var libs = this.getConfig().getLibraries();
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URL[] urls = new URL[libs.size() + 1];
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urls[libs.size()] = this.input.toURI().toURL();
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for (int i = 0; i < libs.size(); i++)
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urls[i] = new File(libs.get(i)).toURI().toURL();
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URLClassLoader classLoader = new URLClassLoader(urls);
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// Write classes
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for(ClassNode classNode : this.classes) {
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var classWriter = new CustomClassWriter(ClassWriter.COMPUTE_FRAMES, classLoader);
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classWriter.newUTF8(BozarMessage.WATERMARK.toString());
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classNode.accept(classWriter);
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byte[] bytes = classWriter.toByteArray();
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out.putNextEntry(new JarEntry(classNode.name + ".class"));
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out.write(bytes);
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}
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}
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// TODO: Print elapsed time & file bloat
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log("Done.");
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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public List<ClassNode> getClasses() {
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return classes;
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}
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public List<ResourceWrapper> getResources() {
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return resources;
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}
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public BozarConfig getConfig() {
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return config;
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}
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public void log(String format, Object... args) {
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System.out.println("[Bozar] " + String.format(format, args));
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}
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public void err(String format, Object... args) {
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System.out.println("[Bozar] [ERROR] " + String.format(format, args));
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}
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}

‎src/main/java/com/vimasig/bozar/obfuscator/transformer/ClassTransformer.java

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package com.vimasig.bozar.obfuscator.transformer;
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import com.vimasig.bozar.obfuscator.Bozar;
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import org.objectweb.asm.Opcodes;
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import org.objectweb.asm.tree.ClassNode;
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import org.objectweb.asm.tree.FieldNode;
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import org.objectweb.asm.tree.MethodNode;
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import java.util.Random;
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public class ClassTransformer implements Opcodes {
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private final Bozar bozar;
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protected final Random random = new Random();
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public ClassTransformer(Bozar bozar) {
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this.bozar = bozar;
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}
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public void transformClass(ClassNode classNode) {}
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public void transformMethod(ClassNode classNode, MethodNode methodNode) {}
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public void transformField(ClassNode classNode, FieldNode fieldNode) {}
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public final Bozar getBozar() {
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return bozar;
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}
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public final String getName() {
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return this.getClass().getSimpleName();
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}
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}

‎src/main/java/com/vimasig/bozar/obfuscator/transformer/TransformManager.java

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package com.vimasig.bozar.obfuscator.transformer;
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import com.vimasig.bozar.obfuscator.Bozar;
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import com.vimasig.bozar.obfuscator.transformer.impl.ConstantTransformer;
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import com.vimasig.bozar.obfuscator.transformer.impl.LineNumberTransformer;
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import com.vimasig.bozar.obfuscator.transformer.impl.LocalVariableTransformer;
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import com.vimasig.bozar.obfuscator.transformer.impl.SourceFileTransformer;
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import com.vimasig.bozar.obfuscator.utils.ASMUtils;
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import org.objectweb.asm.tree.AbstractInsnNode;
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import java.util.ArrayList;
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import java.util.List;
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public class TransformManager {
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private final Bozar bozar;
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private final List<ClassTransformer> classTransformers = new ArrayList<>();
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public TransformManager(Bozar bozar) {
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this.bozar = bozar;
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this.classTransformers.add(new LocalVariableTransformer(bozar));
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this.classTransformers.add(new LineNumberTransformer(bozar));
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this.classTransformers.add(new SourceFileTransformer(bozar));
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this.classTransformers.add(new ConstantTransformer(bozar));
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}
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public void transform() {
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// TODO: Class version check to skip processing old versions
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this.classTransformers.forEach(classTransformer -> {
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this.bozar.log("Applying %s", classTransformer.getName());
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this.bozar.getClasses().forEach(classNode -> {
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// TODO: Exclude feature
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classTransformer.transformClass(classNode);
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classNode.fields.forEach(fieldNode -> classTransformer.transformField(classNode, fieldNode));
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classNode.methods.forEach(methodNode -> {
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AbstractInsnNode[] insns = methodNode.instructions.toArray().clone();
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classTransformer.transformMethod(classNode, methodNode);
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if (!ASMUtils.isMethodSizeValid(methodNode)) {
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this.bozar.log("Cannot apply \"%s\" on \"%s\" due to low method capacity", classTransformer.getName(), classNode.name + "." + methodNode.name + methodNode.desc);
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methodNode.instructions = ASMUtils.arrayToList(insns);
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}
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});
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});
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});
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}
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}

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