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sm: extract sm_sc_calculate_local_confirm

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This commit is contained in:
Matthias Ringwald 2016-05-27 17:26:02 +02:00
parent 514d35fc5d
commit 9af0f475f6
1 changed files with 24 additions and 17 deletions
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41
src/ble/sm.c
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@ -1365,6 +1365,24 @@ static void sm_key_distribution_handle_all_received(sm_connection_t * sm_conn){
sm_conn->sm_le_db_index = le_db_index;
}
#ifdef ENABLE_LE_SECURE_CONNECTIONS
void sm_sc_calculate_local_confirm(void){
uint8_t z = 0;
if (setup->sm_stk_generation_method != JUST_WORKS && setup->sm_stk_generation_method != NK_BOTH_INPUT){
// some form of passkey
uint32_t pk = big_endian_read_32(setup->sm_tk, 12);
z = 0x80 | ((pk >> setup->sm_passkey_bit) & 1);
setup->sm_passkey_bit++;
}
#ifdef USE_MBEDTLS_FOR_ECDH
uint8_t value[32];
mbedtls_mpi_write_binary(&le_keypair.Q.X, value, sizeof(value));
#endif
// TODO: use AES Engine to calculate commitment value using f4
f4(setup->sm_local_confirm, value, setup->sm_peer_qx, setup->sm_local_nonce, z);
}
#endif
static void sm_run(void){
btstack_linked_list_iterator_t it;
@ -1679,6 +1697,7 @@ static void sm_run(void){
case JUST_WORKS:
case NK_BOTH_INPUT:
if (connection->sm_role){
sm_sc_calculate_local_confirm();
connection->sm_engine_state = SM_SC_SEND_CONFIRMATION;
} else {
connection->sm_engine_state = SM_SC_W4_PUBLIC_KEY_COMMAND;
@ -1713,22 +1732,7 @@ static void sm_run(void){
case SM_SC_SEND_CONFIRMATION: {
uint8_t buffer[17];
buffer[0] = SM_CODE_PAIRING_CONFIRM;
#ifdef USE_MBEDTLS_FOR_ECDH
uint8_t z = 0;
if (setup->sm_stk_generation_method != JUST_WORKS && setup->sm_stk_generation_method != NK_BOTH_INPUT){
// some form of passkey
uint32_t pk = big_endian_read_32(setup->sm_tk, 12);
z = 0x80 | ((pk >> setup->sm_passkey_bit) & 1);
setup->sm_passkey_bit++;
}
// TODO: use AES Engine to calculate commitment value using f4
uint8_t value[32];
mbedtls_mpi_write_binary(&le_keypair.Q.X, value, sizeof(value));
sm_key_t confirm_value;
f4(confirm_value, value, setup->sm_peer_qx, setup->sm_local_nonce, z);
reverse_128(confirm_value, &buffer[1]);
#endif
reverse_128(setup->sm_local_confirm, &buffer[1]);
if (connection->sm_role){
connection->sm_engine_state = SM_SC_W4_PAIRING_RANDOM;
} else {
@ -1742,7 +1746,6 @@ static void sm_run(void){
uint8_t buffer[17];
buffer[0] = SM_CODE_PAIRING_RANDOM;
reverse_128(setup->sm_local_nonce, &buffer[1]);
if (setup->sm_stk_generation_method != JUST_WORKS && setup->sm_stk_generation_method != NK_BOTH_INPUT && setup->sm_passkey_bit < 20){
if (connection->sm_role){
// responder
@ -2748,6 +2751,7 @@ static void sm_pdu_handler(uint8_t packet_type, hci_con_handle_t con_handle, uin
case PK_INIT_INPUT:
case PK_RESP_INPUT:
case OK_BOTH_INPUT:
sm_sc_calculate_local_confirm();
sm_conn->sm_engine_state = SM_SC_SEND_CONFIRMATION;
break;
case OOB:
@ -2767,6 +2771,7 @@ static void sm_pdu_handler(uint8_t packet_type, hci_con_handle_t con_handle, uin
if (sm_conn->sm_role){
// responder
sm_sc_calculate_local_confirm();
sm_conn->sm_engine_state = SM_SC_SEND_CONFIRMATION;
} else {
// initiator
@ -2796,6 +2801,7 @@ static void sm_pdu_handler(uint8_t packet_type, hci_con_handle_t con_handle, uin
// only check for JUST WORK/NC in initiator role AND passkey entry
if (sm_conn->sm_role || passkey_entry) {
sm_key_t confirm_value;
#ifdef USE_MBEDTLS_FOR_ECDH
uint8_t local_qx[32];
mbedtls_mpi_write_binary(&le_keypair.Q.X, local_qx, sizeof(local_qx));
@ -2831,6 +2837,7 @@ static void sm_pdu_handler(uint8_t packet_type, hci_con_handle_t con_handle, uin
case PK_RESP_INPUT:
case OK_BOTH_INPUT:
if (setup->sm_passkey_bit < 20) {
sm_sc_calculate_local_confirm();
sm_conn->sm_engine_state = SM_SC_SEND_CONFIRMATION;
} else {
sm_conn->sm_engine_state = SM_SC_SEND_DHKEY_CHECK_COMMAND;