Is it possible to recover "signing key" owned privately by developer..?

I have target soft which protected by xheo. I tried to make lic file for this app using xheo license manager but it asking for "signing key" which i guess only developer of that soft can acsess it. It is not like SLM which we can recover Dev ID and also feature name and version.

Note this. There are 2 things the user can do with a private/public developer key function.

1. He can encrypt/decrypt the data/code/resource regions

2. He can use the private key simply as serial number to verify with his public key.

If its option 1, then you may need to check the function in the executable than says that the private key you mentioned in the license is incorrect, and patch that. with lots of luck, the programmer would not be smart enough to integrate it into the program and your program license should work with whatever key you have. This is often what's done in patching Flexlm files.

If its option 2 then its simpler. Try to find out by what mean (what algorithm: RSA/DES/ etc) has the public key been generated. Use that same algorithm to generate your own public/private key pairs. Replace the original public key with your public key. Enter your own private key in the license and you are done. Of course, the option 1 also works here.

Have Phun.

public key generated by RSA algo
How do i find or identify these keys inside target app?