Using the phone sounds like an idea, I've created an initial PR to do this without gadget bridge (as I don't have it currently) but would be interested in adjustments to encrypt using a key stored either on the phone, or using some property of the phone.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Using the phone sounds like an idea, I've created an initial PR to do this without gadget bridge (as I don't have it currently) but would be interested in adjustments to encrypt using a key stored either on the phone, or using some property of the phone.