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Everything in Limbo is out to hurt you. By the moment the scene comes into existence when that giant spider-leg unfurls menacing than it has any right to be, you are in a world that does not need you there. Limbo is an unbelievable achievement.
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Keygen Hello. You probably even bought it in Steam , or downloaded it from torrents I also bought it once which I advise you! But, as always, it was not enough for me, and I, out of sports interest, decided to study its protection. In this article I will tell and show you how I did it. Before you begin, remember: Respect the work of gamedevelopers. Stage One: Patient’s Surface Examination The full game installer can be downloaded here. Having established the game, first of all, as usual, we find out what the main executable file is written on.
I will use ExeInfo PE for this. Visual Studio IDA Pro perfectly copes with it, so we will send it there. Stage two: First of all, let’s give Ide to analyze limbo. Next, you need to determine what exactly we actually want to find here. Run the game: On it and click. Next, we are waiting for the unexpected at least when I first chose this menu item, I expected to see the input field on the graphic engine of the game, or something like that, but it turned out to be much easier Yes Yes!
It is the usual window! It’s easier for us. Let’s try to enter something, and click Unlock. Something like this: Well, let’s look for the text in IDA , then to make a start from it, and find the place of the check. And then I expected a bummer In the text of the message in the error box, Ida found nothing for me!
The same thing said to me and search for content through Total Commander. The message may be encrypted. But, I went another way, which, for some reason, few places in articles describe. Stage Three: Click Me We will proceed as follows. Open any resource editor that is convenient for you, dragging an ehe-shnik into it, find the dialog box for entering the key, and in it – the Unlock button.
No sooner said than done: On the screen I highlighted the ID of our button. According to it, we will look for exactly where the click is processed. And there was this: Let’s start with them. Double click on the first of these results: With a green arrow, I marked the place indicated by Ida , and just below habit: Judging by the name on MSDN , this function receives the text of the specified window element into the buffer.
Why did I not immediately search for the input field ID? You can, of course, and so it was done. But, you never know what actions take place after pressing the button, even before the text is read from the field.
So, let’s see where the resulting serial goes. Scroll the listing to see the entire place to call the API function: Let’s check a guess Stage Four: Decompilation Go to the function. We see there jump to another address – go through it. We see the normal code, so feel free to click there F5 call HexRays Decompiler.
First of all, we note that the input parameter is of type int , which is not entirely true. To do this, we become the name of the function and click there Y Set item type. We fix the type and name of the input parameter I called it as key. See the line: To do this, on each of these numbers, press R Char.
Already better: Rename it by clicking on the name of the N Name key. We notice that in the cycle, each character is taken from the key, and transferred to an unknown function. I propose to find out what this function is. Double click to go into it. We see there a call to another function, go there. And here it is – processing a single character! There is a lot of work here for the R key, but I will just show the result of the processing immediately. Now go back to the main function with the Esc key.
We note that IDA itself redefined the result type returned by the function for processing the character for us. Name further, denote types, and get the following loop code: We see that the variable designated by it as itr is not incremented at all.
We find out: We take this into account when writing keygens. Now the second part of the key verification function We still have one unexplored function, which, by the way, is very similar to the CRC32 counting function.
The result of processing albeit in a hurry, but readable: Keygen Writing Task: I will write, contrary to common sense and the issuance of HexRays , in Delphi , and you can write in the language that is easier for you. By debugging we find out what happened: The game needs a key of 32 characters without hyphens 37 – with hyphens. Four characters are taken from the key hyphens are not counted. Reverse thinking: Write a function that converts a character hash back to the key; Generate a character hash; Calculate from it 8 – character CRC32; Glue the lines obtained in steps 2 and 3 ; Pass to function 1 – we get the desired key.
Thoughts on the transformative function: The final version of the function that generates a hash Delphi function GenHash len: Hash to code function function Hash2Code const Hash: Entering the generated key activated the game, the activation point disappeared! Results The main thing when writing keygen is to be able to think back. This is not an easy task, but, and it can be solved in most cases. PS Perhaps the article was too messy, I do not know. The main idea I wanted to convey:
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Keygen Hello. You probably even bought it in Steam , or downloaded it from torrents I also bought it once which I advise you! But, as always, it was not enough for me, and I, out of sports interest, decided to study its protection.
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