Adding download and simple conversion functionality and GUI updates to a Encryption program

I have a simple encryption program (C# Core) that I need modified to be able to create a text file with the various hashed strings and base conversion values. Also updating the GUI to allow users to enter in the encrypted values returned, along with their passwords + salt to get the decrypted string. Basically nearly all of the functionality is already implemented, but the program needs an updated user interface and file download capabilities. Project requires a NDA. See the attached PDF for specifics.