By Alex Kalinovsky
As a Java developer, you could end up in a scenario the place you might want to keep a person else's code or use a third-party's library to your personal program with out documentation of the unique resource code. instead of spend hours feeling such as you are looking to bang your head opposed to the wall, flip to Covert Java: ideas for Decompiling, Patching, and opposite Engineering. those thoughts will make it easier to greater comprehend and paintings with third-party functions. every one bankruptcy makes a speciality of a strategy to unravel a selected challenge, comparable to obfuscation in code or scalability vulnerabilities, outlining the problem and demonstrating attainable strategies. Summaries on the finish of every bankruptcy can help you double payment that you simply understood the an important issues of every lesson. additionally, you will have the ability to obtain all code examples and pattern functions for destiny reference from the publisher's web site. permit Covert Java assist you crack open mysterious codes!
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Additional info for Covert Java: Techniques for Decompiling, Patching, and Reverse Engineering
Example text
7g. Copyright 2000 Pavel Kouznetsov. start(); } String hostName; String userName; } 21 Decompiling a Class Take a few moments to review the generated code. As you can see, the code is almost a 100% match to the original! The order of variables, methods, and inner class declarations is different, and so is the formatting, but the logic is absolutely the same. We have also lost the comments, but well-written Java code such as ours is self-evident, isn’t it? Our case produced good results because full debugging information is included by javac when the -g option is used.
The introduced code does not prevent the original code from executing, but an attempt to decompile the class file results in a failure—or at best in confusing source code full of JVM INSTR keywords. 3 shows how a decompiler might handle corrupt code. The risk of using this method is that the corrupted code might not run on a version of JVM that 33 Knowing the Best Obfuscators more closely adheres to the specification. Even if it is not an issue with the majority of JVMs today, it might become a problem later.
LoadClass() passing an original class name, a ClassNotFound exception can result. Modern obfuscators are pretty good with handling such cases, and they attempt to change the strings to reflect the new names. If the string is created at runtime or read from a properties file, though, the obfuscator is incapable of handling it. Good obfuscators produce a log file with warnings pointing out the code that has potential for runtime problems. STORIES FROM THE TRENCHES The most innovative product from CreamTec is WebCream, which is available for a free download from the Web.