I wasn't sure where else to ask this so I will ask it here.
I work for a company that uses a rather old piece of tooling and we use customized software to control it. We hired a guy to code the controller for us, and it works fine, however, we caught him stealing and fired him. After we fired him, we found out that he's coded in a check that is comparing an encrypted file to the serial number of the machine so we can't use the code on any other machine on the floor(we have ten of these things). I looked at the code in hopper, and it appears that this is simply the serial number AES encrypted somehow. Knowing this, would it be possible to reverse engineer the file so that we can create this file for each of the machines?