Reverser

18 May 2009, 14:51

Like the title says, this application can calculate and reverse AND/OR/XOR. It is made by me in Delphi. Bugs/Suggestions are welcome. I hope you like it! :)

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EncryptoT 18 May 2009, 15:37 #

hey Saduff. I dont think AND and OR are reversible functions. XOR however is
a xor b = c
c xor b = a
c xor a = b
AND functions are bitwise operations and if you do some research into truth tables you will see what I mean.

Cheers

EncryptoT 18 May 2009, 17:53 #

XOR works fine in this

just AND and OR are irreversible

Saduff 18 May 2009, 18:29 #

AND & OR are not completely irreversible, there are just many possibilities. For example,
D6 AND A1 = 80
88 AND A1 = 80
82 AND A1 = 80
90 AND A1 = 80
94 AND A1 = 80
8E AND A1 = 80
etc..

My program helps you find the possibilities, so you don't have to completely do trial and error.

Maybe I'm wrong though, I don't know. :))

Also, I noticed a little bug in XOR calculation in my program. In my program XOR 4,3D = 9, but correct would be XOR 4,3D = 39.

Office Jesus 18 May 2009, 21:15 #

Awesome. I might use this to inspire me to get back into Delphi. :P
The source code for that About box would be excellent, but I understand if you want to keep it private.

Mirror:

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Also, thanks for the mention.

EncryptoT 18 May 2009, 21:17 #

yes you are correct but .. AND and OR are one to many functions. and xor is a one-to-one function.

but it
is a good idea

Ideally a bruteforce would show the possible results ( maybe in a memo or something :P )

Saduff 18 May 2009, 22:09 #

@OJ, thanks for the mirror. I'll PM you the source tomorrow. I'll also have to fix the XOR calculation, like I said before. I've basically got it fixed, there's only one little thing giving me errors.

Saduff 19 May 2009, 11:43 #

Ok, I fixed the XOR calculation. Link updated in first post. OJ, could you update your mirror as well?

torben 22 May 2009, 07:57 #

It looks interesting, thx! But this error appears "rtl70.bpl is missing". Why not statically link this package?

These two should be integrated:
vcl70.bpl
rtl70.bpl

Greetz

Saduff 22 May 2009, 11:16 #

Hmm, Delphi programs should not require any dll's or other packages, except the .exe. Anyway, you can download the files here:

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You can place them in your WINDOWS\System32 folder, then you don't have to worry about these files anymore.

torben 22 May 2009, 11:38 #

Thx for the libraries link! I have expirence in c++ programming. It's the same here:

You can statical or dynamic link the needed libraries with the project.

dynamic means: At the execution of the EXE, it needs the extern libraries to run.
statical means: the needed libraries are included in the EXE -- greater size but no ones needed extern libraries (for the people they don't have installed delphi, like me)

Saduff 22 May 2009, 12:29 #

Hm, strange! All other Delphi programs have always worked without any libraries on a computer that doesn't have Delphi installed, but this program doesn't run at all. It didn't even display an error message. Something must be wrong with this exe.

torben 22 May 2009, 13:43 #

Now I read ironically speaking from your message :bb

.
I only want to help you, no more, no less! In the moment, I try your Register Me #7. But it seems I must program a keygen for it (in the manually reversing I have made somewhere an error).

BTW: Same problem with the EXE here: Keygen_hybrid__1.exe (even more librarys are absent)

PEACE

Saduff 22 May 2009, 15:01 #

Yes, this keygen was made after my OS reinstall. Not any of the programs work that I have made after the new installation of Delphi. Something is wrong with my Delphi, all older programs work fine. I'm going to try a reinstall and see if that fixes it.

Saduff 22 May 2009, 22:27 #

I had Delphi 7 Enterprise before, now I installed Delphi 7 SE and everything works fine now. Now it shouldn't require any libraries. I also fixed some bugs in the calculation algos. Link updated in first post.
I have to recompile all programs I made with the Delphi 7 Enterprise.

--=NewHitman=-- 23 May 2009, 14:37 #

You became a progtammer well done chum well done

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Saduff

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