static void gzp_process_encrypted_user_data(uint8_t* rx_payload, uint8_t length)
{
uint8_t tx_payload[GZP_CMD_ENCRYPTED_USER_DATA_RESP_PAYLOAD_LENGTH];
if(gzp_id_req_received())
{
gzp_crypt_select_key(GZP_ID_EXCHANGE);
}
else
{
gzp_crypt_select_key(GZP_DATA_EXCHANGE);
}
gzp_crypt(&rx_payload[1], &rx_payload[1], length - 1);
if(gzp_validate_id(&rx_payload[GZP_CMD_ENCRYPTED_USER_DATA_VALIDATION_ID]))
{
gzp_encrypted_user_data_length = length - GZP_USER_DATA_PACKET_OVERHEAD;
memcpy((void*)gzp_encrypted_user_data, &rx_payload[GZP_CMD_ENCRYPTED_USER_DATA_PAYLOAD], gzp_encrypted_user_data_length);
}
// Build response packet
tx_payload[0] = GZP_CMD_ENCRYPTED_USER_DATA_RESP;
gzp_add_validation_id(&tx_payload[GZP_CMD_ENCRYPTED_USER_DATA_RESP_VALIDATION_ID]);
gzp_crypt(&tx_payload[GZP_CMD_ENCRYPTED_USER_DATA_RESP_VALIDATION_ID], &tx_payload[GZP_CMD_ENCRYPTED_USER_DATA_RESP_VALIDATION_ID], GZP_VALIDATION_ID_LENGTH);
gzp_get_session_counter(&tx_payload[GZP_CMD_ENCRYPTED_USER_DATA_RESP_SESSION_TOKEN]);
// Update "session token" only if no ID request is pending
if(!gzp_id_req_received())
{
gzp_crypt_set_session_token(&tx_payload[GZP_CMD_ENCRYPTED_USER_DATA_RESP_SESSION_TOKEN]);
}
gzp_preload_ack(tx_payload, GZP_CMD_ENCRYPTED_USER_DATA_RESP_PAYLOAD_LENGTH, GZP_DATA_PIPE);
}
static void gzp_process_id_req(uint8_t* rx_payload)
{
uint8_t temp_host_id[GZP_HOST_ID_LENGTH];
if(gzp_pairing_enabled_f)
{
if(!gzp_id_req_received())
{
gzp_crypt_set_session_token(&rx_payload[GZP_CMD_HOST_ID_REQ_SESSION_TOKEN]);
gzp_id_req_stat = GZP_ID_REQ_PENDING;
}
// If host ID not generated yet
if(!gzp_get_host_id(temp_host_id))
{
// Generate new host ID from "session counter" and received "session token"
gzp_get_session_counter(temp_host_id);
if(GZP_HOST_ID_LENGTH > GZP_SESSION_TOKEN_LENGTH)
{
gzp_xor_cipher(temp_host_id, temp_host_id, &rx_payload[GZP_CMD_HOST_ID_REQ_SESSION_TOKEN], GZP_SESSION_TOKEN_LENGTH);
}
else
{
gzp_xor_cipher(temp_host_id, temp_host_id, &rx_payload[GZP_CMD_HOST_ID_REQ_SESSION_TOKEN], GZP_HOST_ID_LENGTH);
}
gzp_set_host_id(temp_host_id);
}
}
}
static void gzp_process_key_update_prepare()
{
uint8_t tx_payload[GZP_CMD_KEY_UPDATE_PREPARE_RESP_PAYLOAD_LENGTH];
tx_payload[0] = GZP_CMD_KEY_UPDATE_PREPARE_RESP;
gzp_get_session_counter(&tx_payload[GZP_CMD_KEY_UPDATE_PREPARE_RESP_SESSION_TOKEN]);
// Update session token if no ID request is pending
if(!gzp_id_req_received())
{
gzp_crypt_set_session_token(&tx_payload[GZP_CMD_KEY_UPDATE_PREPARE_RESP_SESSION_TOKEN]);
}
gzp_preload_ack(tx_payload, GZP_CMD_KEY_UPDATE_PREPARE_RESP_PAYLOAD_LENGTH, GZP_DATA_PIPE);
}
static void gzp_process_key_update_prepare()
{
uint8_t tx_payload[GZP_CMD_KEY_UPDATE_PREPARE_RESP_PAYLOAD_LENGTH];
tx_payload[0] = (uint8_t)GZP_CMD_KEY_UPDATE_PREPARE_RESP;
gzp_get_session_counter(&tx_payload[GZP_CMD_KEY_UPDATE_PREPARE_RESP_SESSION_TOKEN]);
// Update session token if no ID request is pending
if(!gzp_id_req_received())
{
gzp_crypt_set_session_token(&tx_payload[GZP_CMD_KEY_UPDATE_PREPARE_RESP_SESSION_TOKEN]);
}
gzp_preload_ack(tx_payload, GZP_CMD_KEY_UPDATE_PREPARE_RESP_PAYLOAD_LENGTH, GZP_DATA_PIPE);
ASSERT(nrf_gzll_get_error_code() == NRF_GZLL_ERROR_CODE_NO_ERROR);
}
static void gzp_process_id_req(uint8_t* rx_payload)
{
int i;
uint8_t temp_host_id[GZP_HOST_ID_LENGTH];
if(gzp_pairing_enabled_f)
{
if(!gzp_id_req_received())
{
gzp_crypt_set_session_token(&rx_payload[GZP_CMD_HOST_ID_REQ_SESSION_TOKEN]);
gzp_id_req_stat = GZP_ID_REQ_PENDING;
}
gzp_get_host_id(temp_host_id);
// Added:
for(i = 0; i < GZP_HOST_ID_LENGTH; i++)
{
if(temp_host_id[i] != 0xFF)
{
break;
}
}
if(i == GZP_HOST_ID_LENGTH) // If host not generated yet
{
gzp_get_session_counter(temp_host_id);
//lint -save -e506 Constantvalue Boolean
if(GZP_HOST_ID_LENGTH > GZP_SESSION_TOKEN_LENGTH)
{
//lint -restore
gzp_xor_cipher(temp_host_id, temp_host_id, &rx_payload[GZP_CMD_HOST_ID_REQ_SESSION_TOKEN], GZP_SESSION_TOKEN_LENGTH);
}
else
{
gzp_xor_cipher(temp_host_id, temp_host_id, &rx_payload[GZP_CMD_HOST_ID_REQ_SESSION_TOKEN], GZP_HOST_ID_LENGTH);
}
gzp_set_host_id(temp_host_id);
}
}
}
