Is there any polymorphic encryption toolkit that could enable a custom encryption method tailored for your own use? Kinda like security by obscurity for encrypt

Is there any polymorphic encryption toolkit that could enable a custom encryption method tailored for your own use? Kinda like security by obscurity for encrypting your own important files by deviating from the established standard encryption schemes in order to overwhelm capabilities of Mallory's/Trudy's reverse engineering?