[keygenme] Back to basics

[HMX0101]

Back to Basics

You don't like crypto? then you like basic math for sure

Only valid solution is a keygen.

HMX0101 // 16-04-2011

pd. seems like my last crackme is still unsolved

btobkgme-hmx.zip

[kakamail]

I miss one thing to make a keygen (maybe two) and need your help please.

We have Name -> CRC32(Name) -> Take signed number

I stuck in bold line how can i make signed number? I don't know to do in delphi, i know a few in delphi, give me some help please

[HMX0101]

I don't understand, what exactly do you mean?

[Blue]

I miss one thing to make a keygen (maybe two) and need your help please.

We have Name -> CRC32(Name) -> Take signed number

I stuck in bold line how can i make signed number? I don't know to do in delphi, i know a few in delphi, give me some help please

Sorry idid,

I can't understand clearly. What you want, but i am posting an example in C.

IF CHAR Name[]="NAME";

then you can do CRC32((UNSIGNED)Name);

[kakamail]

Thank for answering

Exactly i need signed number or convert from unsigned to signed number And exactly i don't know what is signed and unsiged number (please don't say "you need learn more") , it maybe is stupid question, but please help me, or give me some link on internet, because i learn by practice, learn from "top to bottom"

In this keygen: CRC(Name) + 0x13333337 = x

when i calc by calculator of windows, i receive unsigned number

With this name: Lovemagic, i have x in unsigned number is E2F46698, but signed is -487299432, i don't know how to take signed number

I searched on internet and in delphi's help but didn't find anything

@Blue Indian: Thank for your code in C but i don't know C so it's not help me, but very happy with your code

Edited April 20, 2011 by kakamail

[kao]

With this name: Lovemagic, i have x in unsigned number is E2F46698, but signed is -487299432, i don't know how to take signed number

I searched on internet and in delphi's help but didn't find anything

You are mixing up hex (E2F46698) and decimal (-487299432) numbers, it has nothing to do with signed/unsigned numbers..

But, if your problem really is about signed/unsigned numbers, then in Delphi: longword and dword are unsigned, longint is signed. There is no conversion required, it's a matter of simple cast, like this: longint($E2F46698);

Example app:

{$APPTYPE CONSOLE}
uses windows;
var
   d : dword;
   l : longint;
begin
   d := $E2F46698;
   l := longint(d);
   writeln(d);
   writeln(l);
end.

will print:

3807667864
-487299432

First one is unsigned, second - obviously signed.

I suggest that you take a good beginners book (eg. Delphi in a Nutshell) and start reading it. "Delphi 6 Developer's Guide" is not bad either but little bit more complicated.

[kakamail]

You are mixing up hex (E2F46698) and decimal (-487299432) numbers, it has nothing to do with signed/unsigned numbers..

But, if your problem really is about signed/unsigned numbers, then in Delphi: longword and dword are unsigned, longint is signed. There is no conversion required, it's a matter of simple cast, like this: longint($E2F46698);

Your code is useful for me, thank you very much

And i know what's main problem

[kakamail]

oop...! It's difficult to make a keygen, thought that solved it, but i'm wrong I'm surrender >"<

Edited April 22, 2011 by kakamail

[chickenbutt]

The code is small, most of the routines are CRC algo, threading, and window messaging. I started on it yesterday but had to go do other stuff.

I might take another look. Looks like nobody else is doing keygens anymore.

[kakamail]

I'm sure that i understand whole the algo, but i can't make a keygen. Waiting someone post a keygen, i will borrow a source code