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sm: check requirements for ctkd sequentially

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This commit is contained in:
Matthias Ringwald 2020-10-14 10:49:30 +02:00
parent bdb14b0eaf
commit 0b636a850b
1 changed files with 9 additions and 1 deletions
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10
src/ble/sm.c
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@ -2923,9 +2923,17 @@ static void sm_handle_encryption_result_enc_ph3_ltk(void *arg){
}
static bool sm_ctkd_from_le(void){
#ifdef ENABLE_CROSS_TRANSPORT_KEY_DERIVATION
// requirements to derive link key from LE:
// - use secure connections
if (setup->sm_use_secure_connections == 0) return false;
// - bonding needs to be enabled:
bool bonding_enabled = (sm_pairing_packet_get_auth_req(setup->sm_m_preq) & sm_pairing_packet_get_auth_req(setup->sm_s_pres) & SM_AUTHREQ_BONDING ) != 0u;
if (!bonding_enabled) return false;
// - need identity address
bool have_identity_address_info = ((setup->sm_key_distribution_received_set & SM_KEYDIST_FLAG_IDENTITY_ADDRESS_INFORMATION) != 0);
return bonding_enabled && setup->sm_use_secure_connections && have_identity_address_info;
if (!have_identity_address_info) return false;
// get started (all of the above are true)
return true;
#else
return false;
#endif