├── README.md
├── pom.xml
└── src
    └── main
        └── java
            ├── META-INF
                └── MANIFEST.MF
            └── com
                └── main.java


/README.md:
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 1 | # BCELCode
 2 | 对文件进行BCEL编码和解码
 3 | 
 4 | 本工具基于Java开发，主要用来对指定文件进行编码和解码。由于每次更换payload时都要重新运行一次，所以就写了这款工具
 5 | # 免责声明
 6 | 
 7 | 依据中华人民共和国网络安全法第二十七条：任何个人和组织不得从事非法侵入他人网络、干扰他人网络正常功能、窃取网络数据等危害网络安全的活动；不得提供专门用于侵入网络、干扰网络正常功能及防护措施、窃取网络数据等危害网络安全活动的程序、工具；明知他人从事危害网络安全的活动的不得为其提供技术支持、广告推广、支付结算等帮助。
 8 | 
 9 | 使用本工具则默认遵守网络安全法
10 | # 使用说明
11 | 
12 | 显示帮助信息<br/>
13 | ``` Java -jar BCELCode.jar ```<br/>
14 | 
15 | ![image](https://user-images.githubusercontent.com/57057346/145620019-c54e4ab9-87b1-4598-9221-294857bd2325.png)<br/>
16 | 
17 | 对文件进行编码，并在工具文件夹下生成txt文件<br/>
18 | ``` Java -jar BCELCode.jar -e FilePth ```<br/>
19 | 
20 | ![image](https://user-images.githubusercontent.com/57057346/145620866-5bcd73ad-2019-457b-91a1-d44b1f77855d.png)<br/>
21 | 
22 | 对文件进行解码，并在工具文件夹下生成class文件<br/>
23 | ``` Java -jar BCELCode.jar -d FilePath ```<br/>
24 | 
25 | ![image](https://user-images.githubusercontent.com/57057346/145621676-5c1fe8ac-9dba-4891-8302-8ed7bcfec918.png)<br/>
26 | 


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/pom.xml:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <project xmlns="http://maven.apache.org/POM/4.0.0"
 3 |          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4 |          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5 |     <modelVersion>4.0.0</modelVersion>
 6 | 
 7 |     <groupId>org.example</groupId>
 8 |     <artifactId>BCELCode</artifactId>
 9 |     <version>1.0-SNAPSHOT</version>
10 | 
11 |     <properties>
12 |         <maven.compiler.source>7</maven.compiler.source>
13 |         <maven.compiler.target>7</maven.compiler.target>
14 |     </properties>
15 |     <dependencies>
16 |         <!-- https://mvnrepository.com/artifact/org.apache.bcel/bcel -->
17 |         <dependency>
18 |             <groupId>org.apache.bcel</groupId>
19 |             <artifactId>bcel</artifactId>
20 |             <version>5.2</version>
21 |         </dependency>
22 |         <!-- https://mvnrepository.com/artifact/commons-cli/commons-cli -->
23 |         <dependency>
24 |             <groupId>commons-cli</groupId>
25 |             <artifactId>commons-cli</artifactId>
26 |             <version>1.5.0</version>
27 |         </dependency>
28 |     </dependencies>
29 | 
30 | </project>


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/src/main/java/META-INF/MANIFEST.MF:
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1 | Manifest-Version: 1.0
2 | Main-Class: com.main
3 | 
4 | 


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/src/main/java/com/main.java:
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 1 | package com;
 2 | 
 3 | import org.apache.bcel.classfile.Utility;
 4 | import org.apache.commons.cli.*;
 5 | 
 6 | import java.io.File;
 7 | import java.io.FileOutputStream;
 8 | import java.io.PrintWriter;
 9 | import java.nio.ByteBuffer;
10 | import java.nio.file.Files;
11 | import java.nio.file.Paths;
12 | 
13 | class DtOptions {
14 | 
15 |     public static Options generateOp() {
16 |         final Options options = new Options();
17 |         options.addOption(new Option("e", "encode", true, "Enter the path of the file to be encoded"));
18 |         options.addOption(new Option("d", "decode", true, "Enter the path to the file to decode"));
19 |         options.addOption(new Option("h", "help", false, "Show this help"));
20 |         return options;
21 |     }
22 | }
23 | 
24 | public class main {
25 | 
26 |     public static void main(String[] args) throws Exception {
27 |         CommandLineParser parser = new DefaultParser();
28 |         Options options = DtOptions.generateOp();
29 |         CommandLine line = parser.parse(options, args);
30 |         if (line.hasOption("e")) {
31 |             encode(line.getOptionValue("e"));
32 |         } else if (line.hasOption("d")) {
33 |             decode(line.getOptionValue("d"));
34 |         } else {
35 |             HelpFormatter formatter = new HelpFormatter();
36 |             formatter.printHelp("h", options);
37 |         }
38 |     }
39 | 
40 |     public static void encode(String filepath) {
41 |         String filename = filepath.trim();
42 |         filename = filename.substring(filename.lastIndexOf("/") + 1).split("\\.")[0] + ".txt";
43 |         try {
44 | 
45 |             byte[] data = Files.readAllBytes(Paths.get(filepath));
46 |             String str = Utility.encode(data, true);
47 |             str = "$$BCEL$$" + str;
48 | 
49 |             PrintWriter pw = new PrintWriter(filename);
50 |             pw.println(str);
51 |             pw.close();
52 |             System.out.println("BCEL encoding is successful and saved to " + filename);
53 |         } catch (Exception e) {
54 |             System.out.println("Error: " + e);
55 |         }
56 |     }
57 | 
58 |     public static void decode(String filepath) {
59 |         String filename = filepath.trim();
60 |         filename = filename.substring(filename.lastIndexOf("/") + 1).split("\\.")[0] + ".class";
61 |         try {
62 | 
63 |             byte[] data = Files.readAllBytes(Paths.get(filepath));
64 |             String str = new String(data, "utf-8").split("\n")[0];
65 |             if (str.startsWith("$$BCEL$$") || str.startsWith("$$bcel$$")) {
66 |                 str = str.substring(8);
67 |             }
68 |             byte[] b = Utility.decode(str, true);
69 | 
70 |             ByteBuffer buffer = ByteBuffer.wrap(b);
71 |             File file = new File(filename);
72 |             FileOutputStream os = new FileOutputStream(file);
73 |             os.write(b);
74 |             os.close();
75 |             System.out.println("BCEL decoded successfully and saved to " + filename);
76 | 
77 |         } catch (Exception e) {
78 |             System.out.println("Error: " + e);
79 |         }
80 |     }
81 | }
82 | 


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