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Nordic Case Info
  • Case ID: 307667
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How to exact Link Keys from Nordic nRF5340 Audio EDK?

Ottowei

Our BQTF wishes to sniff LC3 packages, however without linkkeys, packages cannot be decrypted.

Any ideas on how to obtain link keys while debugging with a nRF5340 EDK attached or where to obtain them?

How are Link Keys extracted from the Nordic nRF5340 audio EDK?

Note the LC3 packages are visible in BIS mode, but they are encrypted in CIS mode.

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  • +1

    You've got two options I think.

    Either do 

    CONFIG_BT_LOG_SNIFFER_INFO=y
    CONFIG_BT_DEBUG_LOG=y

    This will print out the randomly generatied keys to the console so you can enter them manually in the sniffer.

    Or you can do 


    CONFIG_BT_TINYCRYPT_ECC=y
    CONFIG_BT_USE_DEBUG_KEYS=y

    Then the connection will use pre-determined keys that the sniffer should have stored in its memory and then it can decrypt the packets without any more input needed from you.

Reply
  • +1

    You've got two options I think.

    Either do 

    CONFIG_BT_LOG_SNIFFER_INFO=y
    CONFIG_BT_DEBUG_LOG=y

    This will print out the randomly generatied keys to the console so you can enter them manually in the sniffer.

    Or you can do 


    CONFIG_BT_TINYCRYPT_ECC=y
    CONFIG_BT_USE_DEBUG_KEYS=y

    Then the connection will use pre-determined keys that the sniffer should have stored in its memory and then it can decrypt the packets without any more input needed from you.

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