Is there any peripheral sample for OOB legacy pairing?

[wang123]

Is there any peripheral sample for OOB legacy pairing?
I'd like to know how to encrypt with temporary key(TK).
I checked the ble_hids_keyboard_pair_nfc sample in the SDK 17.1.0, but I couldn't find the part that generated LP_CONFIRM_R and STK from TK.
I would appreciate any advice.

[Simonr]

Hi Wang

Yes, the nRF52 series all support legacy OOB pairing. The authentication key is generated like this in the NFC examples that uses legacy OOB for example. 

{
                // Generate Authentication OOB Key and update NDEF message content.
                uint8_t length = random_vector_generate(m_oob_auth_key.tk, BLE_GAP_SEC_KEY_LEN);
                random_vector_log(length);
                err_code = nfc_tk_group_modifier_update(&m_oob_auth_key);
                APP_ERROR_CHECK(err_code);
            }

I'm not sure what you refer to with LP_CONFIRM_R as that's not mentioned in the entire SDK as far as I can see?

Best regards,

Simon

[wang123]

Hi Simon,
Thank you for your courteous reply.
I recognize that the attached code only generates TK and writes the information in the NFC tag and is not used in the pairing process. Is it correct?
I wanted to know how to realize the part of the red frame.

Best regards,
wang