Developping small app Internet of Things

I need a simple Internet of Things app who hoave this functions Startup: a simple program that will play the role of the boot of your device Program: an encrypted and signed file simulating the storage of the main code of the application Data: the file simulating the storage of data storage and using the AES-128 bit and Elliptic-Curve encryption algorithms re-encrypt the data file and the program file before To generate the signature of the main program you can generate its hash (SHA-256) and encrypt your hash with your Elliptic-Curve private key.