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sm: allow to set a fixed passkey for LE Legacy Pairing when in display role

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This commit is contained in:
Matthias Ringwald 2017-09-12 16:27:10 +02:00
parent 36b4a12c09
commit caf15bf3c4
2 changed files with 28 additions and 7 deletions
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27
src/ble/sm.c
View File

@ -178,6 +178,7 @@ static uint8_t sm_min_encryption_key_size;
static uint8_t sm_auth_req = 0;
static uint8_t sm_io_capabilities = IO_CAPABILITY_NO_INPUT_NO_OUTPUT;
static uint8_t sm_slave_request_security;
static uint32_t sm_fixed_legacy_pairing_passkey_in_display_role;
#ifdef ENABLE_LE_SECURE_CONNECTIONS
static uint8_t sm_have_ec_keypair;
#endif
@ -2930,13 +2931,19 @@ static void sm_handle_random_result(uint8_t * data){
case SM_PH2_W4_RANDOM_TK:
{
// map random to 0-999999 without speding much cycles on a modulus operation
uint32_t tk = little_endian_read_32(data,0);
tk = tk & 0xfffff; // 1048575
if (tk >= 999999){
tk = tk - 999999;
}
sm_reset_tk();
uint32_t tk;
if (sm_fixed_legacy_pairing_passkey_in_display_role == 0xffffffff){
// map random to 0-999999 without speding much cycles on a modulus operation
tk = little_endian_read_32(data,0);
tk = tk & 0xfffff; // 1048575
if (tk >= 999999){
tk = tk - 999999;
}
} else {
// override with pre-defined passkey
tk = sm_fixed_legacy_pairing_passkey_in_display_role;
}
big_endian_store_32(setup->sm_tk, 12, tk);
if (IS_RESPONDER(connection->sm_role)){
connection->sm_engine_state = SM_RESPONDER_PH1_SEND_PAIRING_RESPONSE;
@ -3783,7 +3790,9 @@ void sm_init(void){
sm_max_encryption_key_size = 16;
sm_min_encryption_key_size = 7;
sm_fixed_legacy_pairing_passkey_in_display_role = 0xffffffff;
#ifdef ENABLE_CMAC_ENGINE
sm_cmac_state = CMAC_IDLE;
#endif
@ -3849,6 +3858,10 @@ void sm_test_use_fixed_ec_keypair(void){
#endif
}
void sm_use_fixed_legacy_pairing_passkey_in_display_role(uint32_t passkey){
sm_fixed_legacy_pairing_passkey_in_display_role = passkey;
}
static sm_connection_t * sm_get_connection_for_handle(hci_con_handle_t con_handle){
hci_connection_t * hci_con = hci_connection_for_handle(con_handle);
if (!hci_con) return NULL;

8
src/ble/sm.h
View File

@ -290,6 +290,14 @@ int sm_le_device_index(hci_con_handle_t con_handle );
*/
void sm_use_fixed_ec_keypair(uint8_t * qx, uint8_t * qy, uint8_t * d);
/**
* @brief Set passkey used with LE Legacy Pairing when we generate and show it instead of random number
* @note Can be used to improve security over Just Works if no keyboard or displary are present and
* individual random passkey can be printed on the device during production
* @param passkey
*/
void sm_use_fixed_legacy_pairing_passkey_in_display_role(uint32_t passkey);
/* API_END */
// PTS testing