AT%CMNG=1, 3rd party board, not showing true stored certificate values

[noahalessi]

Hello,

I am trying to verify the key values I uploaded into the NRF9160 on a 3rd party board - I know with their default application, they did not allow reading back of these certificates. We are developing our own application to be hosted on this board, but the keys are returning a pattern iterating between 0 & the numerical value of the type of key reported (0 for root CA certificate, 1 for client certificate, 2 for client private key).

How can this be removed?

Edit: I believe this is a problem related to the modem FW version of the NRF9160 used in the 3rd party module, which is 1.2.0 vs. the FW version I used in the NRF9160 DK, 1.3.2. With both boards I used the AT Client Sample to review the keys.

[Charlie]

Hi Noah,

According to Credential storage management %CMNG, from MFW v1.3.x≥2, SHA-256 digest of the entity replaced the previous "0x0x0x0.....".

Reading types 1, 2, and 3 are not supported since they are the keys that should only be known by the application developer.

Best regards,

Charlie

[noahalessi]

Thanks Charlie. All I was hoping to do is read the SHA-256 digest of the key for a sanity check - the 0x0x0x.... is not very useful.

[Charlie]

Ok, then you can update the MFW to the latest(nRF9160 DK - Downloads - nordicsemi.com) and manage your own certificates.

Best regards,

Charlie