With this new subcommand, Pico HSM will support newer cipher algorithms. ChaCha20-Poly1305 is the first. It will be based on a custom P2 subcommand to support an arbitrary structure with multiple parameters (AAD, IV, etc.) pico-hsm-tool.py shall be used. Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>