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Now that you have a basic understanding of how Cryptex manages its passwords and encryption keys, you can move on to study the Cryptex directory layout. In a real-world program, this step would be somewhat less relevant for those interested in a security-level analysis for Cryptex, but it would be very important for anyone interested in reading or creating Cryptex-compatible archives. Since we re doing this as an exercise in data reverse engineering, the directory layout is exactly the kind of complex data structure you re looking to get your hands on.

We can then declare a delegate to the add operation of this object. In fact the delegate is actually defined for the transparent proxy instance that is returned from the Activator.GetObject operation:

In order to decipher the directory layout you ll need to find the location in the Cryptex code that reads the encrypted directory layout data, decrypts it, and proceeds to decipher it. This can be accomplished by simply placing a breakpoint on the ReadFile API and tracing forward in the program to see what it does with the data. Let s restart the program in OllyDbg (don t forget to correct the password in the command-line argument), place a breakpoint on ReadFile, and let the program run.

rem Jasmine must be running here! jasload %JAS_SYSTEM%\unload\CAStoreStuff1.uld -s CAStore=castleCF01 jasload %JAS_SYSTEM%\unload\CAStoreStuff2.uld -s CAStore=castleCF01

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The first hit comes from an internal system call made by ADVAPI32DLL Releasing the debugger brings it back to ReadFile again, except that again, it was called internally from system code You will very quickly realize that there are way too many calls to ReadFile for this approach to work; this API is used by the system heavily There are many alternative approaches you could take at this point, depending on the particular application One option would be to try and restrict the ReadFile breakpoint to calls made on the archive file.

delegate int RemoteAddCallDelegate( int, int );

And done! Figure 13.5 shows the class hierarchy in my Class family now. Using the preceding commands and batch files is not difficult, but familiarity with the Jasmine documentation is highly recommended. Follow the recommendations in the earlier section, "Importance of Being Scripted," and make sure you have backups before, during, and after you try all of this, and plan for it as soon as possible in development (certainly before any Jasmine Studio development begins).

You could do this by first placing a breakpoint on the API call that opens or creates the archive (this is probably going to be a call to the CreateFile API), obtain the archive handle from that call, and place a selective breakpoint on ReadFile that only breaks when the specific handle to the Cryptex archive is specified (such breakpoints are supported by most debuggers) This would really reduce the number of calls you d only see the relevant calls where Cryptex reads from the archive, and not hundreds of irrelevant system calls On the other hand, since Cryptex is really a fairly simple program, you could just let it run until it reached the key-generation function from Listing 65 At this point you could just step through the rest of the code until you reach interesting code areas that decipher the directory data structures.

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Keep in mind that in most real programs you d have to come up with a better idea for where to place your breakpoint, because simply stepping through the program is going to be an unreasonably tedious task You can start by placing a breakpoint at the end of the key-generation function, on address 00402416 Once you reach that address, you can step back into the calling function and step through several irrelevant code sequences, including a call into a function that apparently performs the actual opening of the archive and ends up calling into 004011C0, which is the function analyzed in Listing 63 The next function call goes into 004019F0, and (based on a quick look at it) appears to be what we re looking for Listing 66 lists the OllyDbg-generated disassembly for this function..

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