Store private key in SE050 chip

[saireddy_saredd]

Hallo,

Currently we are working with SE050 crypto chip with S32K146 micro controllers.
We have two binaries.

Firmware 1. Writes the private key to the SE050 during start up of the system

Firmware 2. Do not write the private key because it already writtern with Firmware1 and loads the same private key during init.

We want to avoid maintaining two firmwares.

Can we write multiple times (every start up) the private key on SE050 chip ? Does the private key stores in eeprom of SE050 crypto chip?

Is there any possibility to read stored private key and avoid writing duplicate key?

Best Regards,

Saidhi reddy Sareddy

@ Christine_Li

[Kan_Li · Accepted solution]

Hi @saireddy_saredd ,

Yes, it is ok to write multiple times (every start up) the private key on SE050 chip, and the private key stores in eeprom/internal flash of SE050 crypto chip, but it consumes the flash/eeprom endurance . Why not check the key availability on start up? There is such APDU command available, please refer to the section for CheckObjectExists in the APDU command spec for details.

Please also note any private key stored in SE050 can not be read out, I assume you are referring to the public key , right?

Have a great day,
Kan

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