Automatic SSID & Password Program Needed

I need a bespoke program writing which will automatically scan the local WAN in the area, and then automatically update the PC with the corresponding network password from a rainbow table of possible passwords, automatically trying each password ( there may be multiple options, usually a maximum of 5) until the correct one is found. The software should be written in such a way that the password which is found cannot be revealed to the user of the software. The software should also have built in a serial number facility, so I can sell this software so it is unique to one user / PC. Other considerations: The software may find SSID codes where the default password has been changed. It should recognise that after trying all possible default passwords have failed, to flag the SSID as unusable / not try to access this. Also an option to run the software for 1 Year & Unlimited time would also be considered helpful.