Display Module for Raspberry Pi Pico + Implementation security

[gpsa]

Do you think that adding a "Display Module for Raspberry Pi Pico" would solve the problem of having to keep the encryption key plain text?

If so, would you be able to point out which part of the code would require a change to wait on user's input?

[polhenarejos]

All Pico Keys firmware are designed to work without any 3rd hardware dependencies. Of course you could add a secure element or display module, but it would run entirely on your side.

[gpsa]

Gotcha! Would you mind pointing where in the code we might need changes to do this?

[polhenarejos]

Function board_button_read() at https://github.com/polhenarejos/pico-keys-sdk/blob/e4e43dae04d093286bd532d7486b24e8237b4960/src/main.c#L206 is the one that returns true or false when BOOTSEL button is pressed or release. You could override it by taking the prompt from display.