JD-Core is a JAVA decompiler written in JAVA. JD-Core is a standalone JAVA library containing the JAVA decompiler of "Java Decompiler project". It support Java 1.1.8 to Java 10.0, including Lambda expressions, method references and default methods. JD-Core is the engine of JD-GUI.

A decompiler is a computer program that translates an executable file to high-level source code. It does therefore the opposite of a typical compiler, which translates a high-level language to a low-level language. While disassemblers translate an executable into assembly language, decompilers go a step further and translate the code into a higher level language such as C or Java, requiring more sophisticated techniques. Decompilers are usually unable to perfectly reconstruct the original source code, thus will frequently produce obfuscated code. Nonetheless, they remain an important tool in the reverse engineering of computer software.

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The term decompiler is most commonly applied to a program which translates executable programs (the output from a compiler) into source code in a (relatively) high level language which, when compiled, will produce an executable whose behavior is the same as the original executable program. By comparison, a disassembler translates an executable program into assembly language (and an assembler could be used for assembling it back into an executable program).

Decompilation is the act of using a decompiler, although the term can also refer to the output of a decompiler. It can be used for the recovery of lost source code, and is also useful in some cases for computer security, interoperability and error correction.[1] The success of decompilation depends on the amount of information present in the code being decompiled and the sophistication of the analysis performed on it. The bytecode formats used by many virtual machines (such as the Java Virtual Machine or the .NET Framework Common Language Runtime) often include extensive metadata and high-level features that make decompilation quite feasible. The application of debug data, i.e. debug-symbols, may enable to reproduce the original names of variables and structures and even the line numbers. Machine language without such metadata or debug data is much harder to decompile.[2]

The places where register contents are defined and used must be traced using data flow analysis. The same analysis can be applied to locations that are used for temporaries and local data. A different name can then be formed for each such connected set of value definitions and uses. It is possible that the same local variable location was used for more than one variable in different parts of the original program. Even worse it is possible for the data flow analysis to identify a path whereby a value may flow between two such uses even though it would never actually happen or matter in reality. This may in bad cases lead to needing to define a location as a union of types. The decompiler may allow the user to explicitly break such unnatural dependencies which will lead to clearer code. This of course means a variable is potentially used without being initialized and so indicates a problem in the original program.[citation needed]

A good machine code decompiler will perform type analysis. Here, the way registers or memory locations are used result in constraints on the possible type of the location. For example, an and instruction implies that the operand is an integer; programs do not use such an operation on floating point values (except in special library code) or on pointers. An add instruction results in three constraints, since the operands may be both integer, or one integer and one pointer (with integer and pointer results respectively; the third constraint comes from the ordering of the two operands when the types are different).[6]

The final phase is the generation of the high level code in the back end of the decompiler. Just as a compiler may have several back ends for generating machine code for different architectures, a decompiler may have several back ends for generating high level code in different high level languages.

Structuring is the hardest part of decompiler development (at least for high level languages). That's a fairly simplistic algorithm, so it's a good starting point, but you'll likely want to use a better algorithm or make your own if you're working on a real decompiler.

Someone I used to work for emailed me out of the blue and said they want me to update a VB3 (!!!) program I wrote for them because customers are reporting having problems running it under Windows 7. They have lost the source code (natch). Is there a decompiler for VB3?

DoDi's VBDIS3 it self is also written in VB3 - so about 10 years later just for fun I cracked it to make the decompiler to decompile it self.... and ported it to VB6!So now you've the source code !!! :D

Unlike the later versions which used native code and are generally not reliably decompilable, VB3 (and, I think, VB4) could be usually decompiled to almost original code. The keywords you need to search for are "DoDi VB3 decompiler" or "vb3dis". Here's a page that seems to have a copy.

Can you recommend a Java decompiler for Eclipse? My other questions is what restrictions is there for using a decompiled code from an other Java program? Illegal or what? I dont know much about licenses. Thanks for reading.

I have tried several decompilers and most of them have failed to produce a correct source for the applet I was trying to decompile (which was ~perlin/experiments/emotive-actors/, in case anyone wants to reproduce).

I used another decompiler DJ to help me work out what was wrong with the code decompiled by JD. But there were other things that DJ couldn't handle, so I guess a mixture of both decompilers worked for me :)

Another aspect is related with exe4j, which package jars to exe file,seems like it can protect java codes , because what we can see is exe file instead of jars or class files. But indeed, when it runs, it decompose all jars files into temporary directories, that means it is easy to get class files for decompiler. So any considerations for protecting java codes from the aspect of exe4j ?

But keep one's head: most people use a decompiler because they have a technical problem and the documentation is poor or nonexistent. Write a good documentation and use a solid EULA is the better solution.

The best method is to document your API (assuming this is available for your customers to use) and application very very well. And have your support personnel be able to resolve API and application issues. Then your customers will have no reason to want to use a decompiler to explore why things are not working correctly.

Hexrays -rays.com/decompiler.shtml is a product that decompiles any Windows executable to C source code. More than any other decompiler, it does not achieve a roundtrip decompilation -- depending on the language, it may be more or less impossible to reconstruct the program from the decompiled source.

The answer is, of course, that you cannot see the source code of a closed source program ;) You may try with existing decompilers, but there is no guarantee you will succeed, which you seem to expect.

I have the JD-eclipse-plugin installed. I want to decompile the classes within a jar-file. So I select the jar-file within Project-Explorer and click Decompiler in the Menu. However both decompilers (JAD and JD-core) are greyed out.

I see many reverse engineering lessons and every second person does reverse engineer using Ghidra decompiler and not disassembler as both are available in the same platform. I assume that reversing using decompiler is easy than disassembler(understanding the assembly of the code). Do I'm thinking right?let's say I'm using Ghidra then when should I see disassembler and when decompiler?Plus If we have now a free decompiler available in Ghidra then the need for a disassembler is gone and there is no need of understanding the assembly when we have a decompiler?

Although these terms are being used interchangeably, there is an intrinsic difference between disassembler and decompiler definitions traditionally. Let's first consider common steps involved in converting low level code to high level human readable code. This is similar to compilation where you convert high level code to low level machine code or an executable.

In my personal opinion, decompiler involves advance analysis and most importantly type and advance structure recovery for high level and user-readable representation. I'd personally use disassembler for analyses like symbolic analysis, code similarity or maybe something like fuzzing where actual high level representation may not be needed. And I'd prefer decompiler, when I'd like to interpret the underlying code or general working of the program. As program is better conceivable that way.

It depends on the reverse engineering, most use decompilers to speed up your work, this helps a lot to locate necessary calls, let's say you are at your job and need to quickly find an X algorithm to deliver your work, so if you were to use only one disassembler you would take much more work time analyzing and converting the small assembly instructions and equivalent high level code, decompilers are wonderful they simplify your life, but don't get stuck in that because it's not enough, let's say that in my example I find the algorithm sought with decompilers to obtain the operation closest to the desired one uses the disassembler and compares its analyzed pseudocode with the decompilers, all this to bring the maximum to the original, also depends on the work to be carried out, good studies.

With that definition, if the program being reverse engineered was written in C, we need a C decompiler to effectively reverse engineer it; similarly, if it was written in Java, we need a Java decompiler. If we use a disassembler on the first case, we can understand the logic and deduce the workings of the code, but we have nothing close to the original source code. If we use a bytecodes explorer for Java, we can follow the execution in the JVM, and understand what the code is doing; but very far from the source code again. be457b7860

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