How to Get LTK (Long Term Key)

[Jetson]

I am currently considering capturing and analyzing LE-Audio packets, but for that I need the LTK used for decryption.BLE Secure Connection pairing does not directly exchange LTK, so I do not know what it is, and I am having trouble.

Could you please tell me how to output an LTK log by modifying the user source code?

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[Srouce]

https://github.com/STMicroelectronics/STM32CubeWBA.git

[Project]

Projects\STM32WBA55G-DK1\Applications\BLE\BLE_Audio_TMAP_Peripheral

Projects\STM32WBA55G-DK1\Applications\BLE\BLE_Audio_TMAP_Central

[Jacob WOODRUFF]

Hi All,

 

This post has been escalated to the ST Online Support Team for additional assistance. We'll contact you directly.

 

Regards,
Jake

ST Support

[TMANE.1]

Hello Jetson,

 

My first proposal is to use debug keys that are known by sniffer tools. For that, you can add at the end of Ble_Hci_Gap_Gatt_Init() function:

 

uint8_t a_sc_key_type[1];
a_sc_key_type[0] = 1;
aci_hal_write_config_data(CONFIG_DATA_SC_KEY_TYPE_OFFSET,1,a_sc_key_type);

 

best regards,

Théo