nrfutil settings generate generates different boot loader settings every time

[RVM]

Pardon my ignorance of the nuances of Security and Encryption but what I am observing is a bit perplexing.

Every time I run the nrfutil command to generate the bootloader settings, with the same input parameters, I get a 'different' settings file.
I am using version 6.1.0 of the nrfutil tool.  If it does matter (not sure why it would) I am using SDK v16.0.0 on an nRF52832 based board with SoftDevice 132 v7.0.2

The command I am running is:

nrfutil settings generate --bl-settings-version 2 --family  NRF52 --bootloader-version 1 --app-boot-validation VALIDATE_ECDSA_P256_SHA256 --key-file MyPrivateKey.key --application-version 1 --application MyApplication.hex MyBootloaderSettings.hex

Cheers
RMV

[Vidar Berg]

Hi,

The ECDSA signature used for Boot validation of the application image is re-generated every time you generate a new settings page, and the signature will change between every iteration because the algorithm includes a random component.

Cheers

Vidar

[RVM]

Thanks.