Encryption, Signing and OTA is there any how-to?

[LastSamurai]

This is what I get:

+------------------------------------------------------------------------------------+
|                           MySensors security personalizer                          |
+------------------------------------------------------------------------------------+

+------------------------------------------------------------------------------------+
|                               Configuration settings                               |
+------------------------------------------------------------------------------------+
| * Guided personalization/storage of keys in EEPROM                                 |
| * Guided storage and generation of random serial in EEPROM                         |
| * Software based personalization (no ATSHA204A usage whatsoever)                   |
| * Will not require UART confirmation before locking ATSHA204A configuration        |
| * Will store HMAC key to EEPROM                                                    |
| * Will store AES key to EEPROM                                                     |
| * Will generate soft serial using software                                         |
| * Will store soft serial to EEPROM                                                 |
+------------------------------------------------------------------------------------+

+------------------------------------------------------------------------------------+
|                           Hardware security peripherals                            |
+--------------+--------------+--------------+------------------------------+--------+
| Device       | Status       | Revision     | Serial number                | Locked |
+--------------+--------------+--------------+------------------------------+--------+
| AVR          | DETECTED     | N/A          | N/A (generation required)    | N/A    |
+--------------+--------------+--------------+------------------------------+--------+

+------------------------------------------------------------------------------------+
|                                       EEPROM                                       |
+--------+--------+------------------------------------------------------------------+
| Key ID | Status | Key                                                              |
+--------+--------+------------------------------------------------------------------+
| HMAC   | OK     | ... |
| AES    | OK     | 00000000000000000000000000000000                                 |
| SERIAL | OK     | 0E0103FA44D749F163                                               |
+--------+--------+------------------------------------------------------------------+

+------------------------------------------------------------------------------------+
|                                   Key generation                                   |
+--------+--------+------------------------------------------------------------------+
| Key ID | Status | Key                                                              |
+--------+--------+------------------------------------------------------------------+
| SERIAL | OK     | 0F5B932A87D43AD318                                               |
+--------+--------+------------------------------------------------------------------+

+------------------------------------------------------------------------------------+
|                                    Key storage                                     |
+--------+--------+------------------------------------------------------------------+
| Key ID | Status | Key                                                              |
+--------+--------+------------------------------------------------------------------+
| HMAC   | OK     | ... |
| AES    | OK     | 00000000000000000000000000000000                                 |
| SERIAL | OK     | 0F5B932A87D43AD318                                               |
+--------+--------+------------------------------------------------------------------+

+------------------------------------------------------------------------------------+
|                                  WHAT TO DO NEXT?                                  |
+------------------------------------------------------------------------------------+
| This device has now been personalized. Run this sketch with its current settings   |
| on all the devices in your network that have security enabled.                     |
+------------------------------------------------------------------------------------+

+------------------------------------------------------------------------------------+
|                                  Execution result                                  |
+------------------------------------------------------------------------------------+
| SUCCESS                                                                            |
+------------------------------------------------------------------------------------+

Ah ok. Still a little confusing in my opinion. Why show the key storage at all with Soft_serial? In this case the key always gets saved in the eeprom (right?). Just the "key generation" and one eeprom afterwards or one before and one after (with different names) would be clearer imo.
Just some (hopefully constructive) critisism. I still like it way more than the old system!

[Anticimex]

@LastSamurai Well, I designed it like this intentionally because I want the "experience" to be uniform.
You have selected a mode which generates a key and stores a key. So it will shows the key(s) it generates and also the key(s) it store. Key generation and key storage is normally two separate things.
You can if you so like completely customize what keys you generate and store using the "advanced" config flags.
The log is designed to show exactly what is happening.
You could if you wanted to tell it to generate a serial but not store it. Or tell it to not generate a serial but store one you have configured yourself. Hence the tables are separated.

[LastSamurai]

@Anticimex Well that makes sense too. I was just a little confused seeing 2 serial keys the first time. I figured it out though, so other will too ;)
Nice work though, much easier to use than the old version!

When I have the time I'll try it with some other nodes in the next days.

[Anticimex]

@LastSamurai thanks. Appreciate the feedback. I am going to test it on a samd device as well and if it looks OK, I'll have the core team review and approve it. Then I'll start looking at the simplified security option.

[LastSamurai]

@Anticimex I just tested the "#define PERSONALIZE_SOFT" option with my new gateway to set serial number and HMAC key and everything seems to work just fine. I have no devices with hardware encryption (yet) so I can't test that one.

[Anticimex]

@LastSamurai hardware encryption? Well, from a personalization perspective, encryption is handled the same. AES key is always stored in eeprom so you can use encryption for nrf24 (as rfm69 is the only radio currently with a hw AES accelerator). Rfm69 still gets the key from eeprom though.

[LastSamurai]

@Anticimex Badly formulated from me ;) What I meant is signing (+ perhaps encryption too) using the ATSHA204A instead of the software backend. All tests I have done are with the software one.

[Anticimex]

@LastSamurai Ah, no, the ATSHA204A is only for signing. You can however go "advanced" and configure the personalizer to use the ATSHA204A to generate a random AES key for encryption use. But the ATSHA204A is not involved in encryption or decryption operations.

[Anticimex]

The updated personalizer has now been merged to the development branch (BETA channel).

[LastSamurai]

Great! Any idea when it will be in the normal branch? Haven been using that for most of the time.

[Anticimex]

@LastSamurai no, there is no schedule set for the next release to my knowledge.