I went through exactly the same process as you: 1) original code in Arduino ... ran into lack of encryption support 2) ported code to ESPIDF using arduino as a component 3) MD5 checksum error when trying to load Arduino firmware via OTA (on an encrypted device) 4) compiled the OTA firmware using ESP...

Hey - did you guys figure out a way to do this? Specifically, looking for step-by-step instructions for taking a XXX.bin from an Arduino-compiled ESP32 project, and using only the command line tools (esptool.py, espefuse.py, espsecure.py) to 1) set up secure boot (V2?) - creating keys - sign binarie...