RTC File format (reverse engineering)

[Taghor]

So,

Looking at the one drive I see there's alot of RTC dungeons (namely the EOB one) which has the txt file with it but not the graphics.

Poking about in the asm, I've made some progress in determing how the encryption methods are achieved. It's essentially a XOR Cipher stream (keystream XORd against plaintext).

Now, this does not mean I can extract anything... It means I can only see unencrypted binary data (for now).

it's only a personal project, I find these kind of things to be some what of a puzzle, but if anyone's interested I can put it on github..

[Gambit37]

Reverse engineering RTC!? The circle is now complete.

[Taghor]

Progress!!

I've got the encryption sorted, and now the decompression.

It essentially stores in different sections, HDR, PTY, SAV, MOD ( maybe more )

MOD is where the graphics, sound etc are stored.

I've written some header carving stuff to extract the bitmaps from it and so far it's looking good, extracting BMP and the WAV files



I'll have a look at tidying it up tomorrow, it's doing the decode, decompress stuff in C and the signature carving in c#. I'd like to have it all in C or C# before I put it on github.

[Taghor]

Github repo:
https://github.com/joesblog/RTCExtractor

The codes a mess, its written for use not beauty!

Probably best to just use the release.

[Sphenx]

Wow ! that's impressive. This is working great on several RTC I tried. The decode code looks like magic to me.