Get some key in nCS

Chipset: nRF52840
SDK: nRF Connect SDK v1.7.0
Project: Sample light_ctrl of Bluetooth mesh 
Compiler: gcc v9.2.1
Cmake: v3.20.5
west:
v0.11.1

Hello,

I'm using the ncs to develop the BLE Mesh device, and I need to get the Network key and App key and Device key for debug, how can I get the key?

Is there have some examples? It would be fine to get some assistance. Thank you.

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