Patch a Windows DLL

Recently I found an old Microsoft fingerprint scanner and wanted to toy around with it. I found an SDK that works with it, but the company has since retired it and is no longer selling licenses. Despite my constant begging and nagging, they just won't do it, and instead want me to buy their new SDK, which doesn't work with my old hardware.

The way the licensing works is, you get assigned a product key, and then you need to activate that product key using their tool. It sends a request to the server with the product key and your mac address, and the server would then check to make sure the key is licensed, and then return a license key, which looks like a public RSA key:














That key is then saved in a text file in the SDK directory. When you start your application and run the Initialize function, it checks to see whether that file exists, and whether the key is legit.

To bypass this protection, I think I just need to find the bit of code that checks to see if the key is legit, and force it to compare against some static value (e.g. 0). I'm having a bit of trouble understanding what the code does though, so I'm willing to pay someone who has knowledge in this area to both patch the DLL, and then explain to me what was patched - a text file with comments is fine.

I will provide the SDK installation kit. I have attached the decompiled bit of code that I believe is responsible for enforcing the licensing protection.

Skills: C++ Programming, Windows API

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About the Employer:
( 0 reviews ) Philadelphia, United States

Project ID: #16501677

6 freelancers are bidding on average $64 for this job

$100 USD in 1 day
(33 Reviews)

Hello bosscube, It sounds like an interesting challenge and very good fit. I have great experience with reverse engineering, so it will be done in a very professional way. Please share that DLL and let me know wh More

$90 USD in 1 day
(5 Reviews)

Dear Client! I have read your post carefully with my interest. I have experience developing desktop apps and web apps, so I think it is a good fit for your project. I also have strong program analysis capabilities More

$30 USD in 1 day
(3 Reviews)

I think can help you to get still working with your SDK. Maybe not in way you described but I can look and help.

$75 USD in 1 day
(0 Reviews)

Hi, I am interested in your project. I can only patch the dll file, if it is not protected or obfuscated with any high quality protection or obfuscation tool.

$66 USD in 2 days
(0 Reviews)

Hello! Nice to meet you. **Reverse Engineering is my major skill.** I have 8+ years experience in Reverse Engineering. Here are my experiences in past works. *Extracting algorithms of executable files. *E More

$25 USD in 1 day
(0 Reviews)