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2008-07-16 Wed

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2007-08-05 Sun

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2007-07-22 Sun

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2007-05-22 Tue

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2006-12-23 Sat

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2006-12-02 Sat

¢£ Homepage of COBF - the Freeware C/C++ Sourcecode Obfuscator!

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2006-08-28 Mon

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2006-08-16 Wed

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2006-06-29 Thu

¢£ ¥í¡¼¥«¥ëÊÑ¿ô¤Î̾Á°ÆñÆÉ²½ for Java

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2006-06-29 Thu

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2006-02-28 Tue

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2005-12-12 Mon

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2005-10-19 Wed

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$ ls hello
HelloWorld.class       JEncoderForWindows.dll  libJEncoderForLinux.so
HelloWorld_Stub.class  com/                    libJEncoderForSolaris.so
$ java -classpath hello HelloWorld_Stub
Hello World
$ java -classpath hello HelloWorld
Exceptioin thread "main" java.lang.ClassFormatError: Incompatible magic value 1768821155 in classfile HelloWorld
        at java.lang.ClassLoader.defineClass1(Native Method)
                 :           hello/HelloWorld ¤¬°Å¹æ²½¤µ¤ì¤Æ¤¤¤ë

$ cat ClassDumper
import java.io.*;
import java.lang.reflect.*;

import javassist.*;

public class ClassDumper{
    private static void dump(CtClass clazz) throws Exception{
        String name = clazz.getName().replace('.', '/');
        File f = new File("class_dumper", name + ".class");
        if(!f.getParentFile().exists()) f.getParentFile().mkdirs();

        DataOutputStream dout = new DataOutputStream(new FileOutputStream(f));
        clazz.toBytecode(dout);

        dout.close();
    }

    public static void main(String[] args) throws Exception{
        Class c = Class.forName(args[0]);
        String[] newArgs = new String[args.length - 2];
        for(int i = 0; i < newArgs.length; i++){
            newArgs[i] = args[i + 2];
        }
        Method m = c.getMethod("main", String[].class);
        m.invoke(null, new Object[] { newArgs });

        ClassPool pool = ClassPool.getDefault();
        CtClass clazz = pool.get(args[1]);

        dump(clazz);
    }
}
$ javac -classpath javassist.jar:. ClassDumper.java
$ java -classpath javassist.jar:.:hello ClassDumper HelloWorld_Stub HelloWorld
$ ls class_dumper
HelloWorld.class
$ java -classpath class_dumper HelloWorld
Hello World



ref. Cracking Java byte-code encryption

Category: [IPP]

2005-06-29 Wed

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