Signing logic has now been centralized to MySigning.cpp in order to simplify
maintenance and debugging.
Debug prints have been extended and "demoted" to verbose level.
To get signing related debug info, MY_DEBUG_VERBOSE will need to be defined.
This fixes#278
Locking operations are recommended to include CRC
and since sha204 library internally carries the proper
algorithm for this, it has now been refactored to support
both static and incremental calculations needed for both
command marchalling and locking.
Taken from the sha204_library folder in
https://github.com/jimblom/sha204-Breakout
Commit 8e1ac05ef987b1869605ad067db2bdbaec1c109f
ATSHA204 is a crypto cirquit from Atmel that enables
SHA256-based MAC and HMAC calculations as well as
secure key storage and random number generation.
This can be used to sign messages passed between
sensor nodes and prevent both man-in-the-middle and
replay attacking.
Patrick Fallberg
Thomas Mørch