+ // First card answer: SOF only
+ CodeIClassTagSOF();
+ memcpy(resp_sof, ToSend, ToSendMax);
+ resp_sof_Len = ToSendMax;
+
+ // Anticollision CSN
+ CodeIso15693AsTag(anticoll_data, sizeof(anticoll_data));
+ memcpy(resp_anticoll, ToSend, ToSendMax);
+ resp_anticoll_len = ToSendMax;
+
+ // CSN (block 0)
+ CodeIso15693AsTag(csn_data, sizeof(csn_data));
+ memcpy(resp_csn, ToSend, ToSendMax);
+ resp_csn_len = ToSendMax;
+
+ // Configuration (block 1)
+ CodeIso15693AsTag(conf_block, sizeof(conf_block));
+ memcpy(resp_conf, ToSend, ToSendMax);
+ resp_conf_len = ToSendMax;
+
+ // e-Purse (block 2)
+ CodeIso15693AsTag(card_challenge_data, sizeof(card_challenge_data));
+ memcpy(resp_cc, ToSend, ToSendMax);
+ resp_cc_len = ToSendMax;
+
+ // Kd, Kc (blocks 3 and 4)
+ CodeIso15693AsTag(ff_data, sizeof(ff_data));
+ memcpy(resp_ff, ToSend, ToSendMax);
+ resp_ff_len = ToSendMax;
+
+ // Application Issuer Area (block 5)
+ CodeIso15693AsTag(aia_data, sizeof(aia_data));
+ memcpy(resp_aia, ToSend, ToSendMax);
+ resp_aia_len = ToSendMax;
+
+ //This is used for responding to READ-block commands or other data which is dynamically generated
+ uint8_t *data_generic_trace = BigBuf_malloc(32 + 2); // 32 bytes data + 2byte CRC is max tag answer
+ uint8_t *data_response = BigBuf_malloc( (32 + 2) * 2 + 2);
+
+ bool buttonPressed = false;
+ enum { IDLE, ACTIVATED, SELECTED, HALTED } chip_state = IDLE;
+
+ while (!exitLoop) {
+ WDT_HIT();
+
+ uint32_t reader_eof_time = 0;
+ len = GetIso15693CommandFromReader(receivedCmd, MAX_FRAME_SIZE, &reader_eof_time);
+ if (len < 0) {
+ buttonPressed = true;
+ break;
+ }
+
+ // Now look at the reader command and provide appropriate responses
+ // default is no response:
+ modulated_response = NULL;
+ modulated_response_size = 0;
+ trace_data = NULL;
+ trace_data_size = 0;
+
+ if (receivedCmd[0] == ICLASS_CMD_ACTALL && len == 1) {
+ // Reader in anticollision phase
+ if (chip_state != HALTED) {
+ modulated_response = resp_sof;
+ modulated_response_size = resp_sof_Len;
+ chip_state = ACTIVATED;
+ }
+
+ } else if (receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 1) { // identify
+ // Reader asks for anticollision CSN
+ if (chip_state == SELECTED || chip_state == ACTIVATED) {
+ modulated_response = resp_anticoll;
+ modulated_response_size = resp_anticoll_len;
+ trace_data = anticoll_data;
+ trace_data_size = sizeof(anticoll_data);
+ }
+
+ } else if (receivedCmd[0] == ICLASS_CMD_SELECT && len == 9) {
+ // Reader selects anticollision CSN.
+ // Tag sends the corresponding real CSN
+ if (chip_state == ACTIVATED || chip_state == SELECTED) {
+ if (!memcmp(receivedCmd+1, anticoll_data, 8)) {
+ modulated_response = resp_csn;
+ modulated_response_size = resp_csn_len;
+ trace_data = csn_data;
+ trace_data_size = sizeof(csn_data);
+ chip_state = SELECTED;
+ } else {
+ chip_state = IDLE;
+ }
+ } else if (chip_state == HALTED) {
+ // RESELECT with CSN
+ if (!memcmp(receivedCmd+1, csn_data, 8)) {
+ modulated_response = resp_csn;
+ modulated_response_size = resp_csn_len;
+ trace_data = csn_data;
+ trace_data_size = sizeof(csn_data);
+ chip_state = SELECTED;
+ }
+ }
+
+ } else if (receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4) { // read block
+ uint16_t blockNo = receivedCmd[1];
+ if (chip_state == SELECTED) {
+ if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {
+ // provide defaults for blocks 0 ... 5
+ switch (blockNo) {
+ case 0: // csn (block 00)
+ modulated_response = resp_csn;
+ modulated_response_size = resp_csn_len;
+ trace_data = csn_data;
+ trace_data_size = sizeof(csn_data);
+ break;
+ case 1: // configuration (block 01)
+ modulated_response = resp_conf;
+ modulated_response_size = resp_conf_len;
+ trace_data = conf_block;
+ trace_data_size = sizeof(conf_block);
+ break;
+ case 2: // e-purse (block 02)
+ modulated_response = resp_cc;
+ modulated_response_size = resp_cc_len;
+ trace_data = card_challenge_data;
+ trace_data_size = sizeof(card_challenge_data);
+ // set epurse of sim2,4 attack
+ if (reader_mac_buf != NULL) {
+ memcpy(reader_mac_buf, card_challenge_data, 8);
+ }
+ break;
+ case 3:
+ case 4: // Kd, Kc, always respond with 0xff bytes
+ modulated_response = resp_ff;
+ modulated_response_size = resp_ff_len;
+ trace_data = ff_data;
+ trace_data_size = sizeof(ff_data);
+ break;
+ case 5: // Application Issuer Area (block 05)
+ modulated_response = resp_aia;
+ modulated_response_size = resp_aia_len;
+ trace_data = aia_data;
+ trace_data_size = sizeof(aia_data);
+ break;
+ // default: don't respond
+ }
+ } else if (simulationMode == ICLASS_SIM_MODE_FULL) {
+ if (blockNo == 3 || blockNo == 4) { // Kd, Kc, always respond with 0xff bytes
+ modulated_response = resp_ff;
+ modulated_response_size = resp_ff_len;
+ trace_data = ff_data;
+ trace_data_size = sizeof(ff_data);
+ } else { // use data from emulator memory
+ memcpy(data_generic_trace, emulator + current_page*page_size + 8*blockNo, 8);
+ AppendCrc(data_generic_trace, 8);
+ trace_data = data_generic_trace;
+ trace_data_size = 10;
+ CodeIso15693AsTag(trace_data, trace_data_size);
+ memcpy(data_response, ToSend, ToSendMax);
+ modulated_response = data_response;
+ modulated_response_size = ToSendMax;
+ }
+ }
+ }
+
+ } else if ((receivedCmd[0] == ICLASS_CMD_READCHECK_KD
+ || receivedCmd[0] == ICLASS_CMD_READCHECK_KC) && receivedCmd[1] == 0x02 && len == 2) {
+ // Read e-purse (88 02 || 18 02)
+ if (chip_state == SELECTED) {
+ if(receivedCmd[0] == ICLASS_CMD_READCHECK_KD){
+ cipher_state = &cipher_state_KD[current_page];
+ diversified_key = diversified_key_d;
+ } else {
+ cipher_state = &cipher_state_KC[current_page];
+ diversified_key = diversified_key_c;
+ }
+ modulated_response = resp_cc;
+ modulated_response_size = resp_cc_len;
+ trace_data = card_challenge_data;
+ trace_data_size = sizeof(card_challenge_data);
+ }
+
+ } else if ((receivedCmd[0] == ICLASS_CMD_CHECK_KC
+ || receivedCmd[0] == ICLASS_CMD_CHECK_KD) && len == 9) {
+ // Reader random and reader MAC!!!
+ if (chip_state == SELECTED) {
+ if (simulationMode == ICLASS_SIM_MODE_FULL) {
+ //NR, from reader, is in receivedCmd+1
+ opt_doTagMAC_2(*cipher_state, receivedCmd+1, data_generic_trace, diversified_key);
+ trace_data = data_generic_trace;
+ trace_data_size = 4;
+ CodeIso15693AsTag(trace_data, trace_data_size);
+ memcpy(data_response, ToSend, ToSendMax);
+ modulated_response = data_response;
+ modulated_response_size = ToSendMax;
+ //exitLoop = true;
+ } else { // Not fullsim, we don't respond
+ // We do not know what to answer, so lets keep quiet
+ if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {
+ if (reader_mac_buf != NULL) {
+ // save NR and MAC for sim 2,4
+ memcpy(reader_mac_buf + 8, receivedCmd + 1, 8);
+ }
+ exitLoop = true;
+ }
+ }
+ }
+
+ } else if (receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {
+ if (chip_state == SELECTED) {
+ // Reader ends the session
+ modulated_response = resp_sof;
+ modulated_response_size = resp_sof_Len;
+ chip_state = HALTED;
+ }
+
+ } else if (simulationMode == ICLASS_SIM_MODE_FULL && receivedCmd[0] == ICLASS_CMD_READ4 && len == 4) { // 0x06
+ //Read 4 blocks
+ if (chip_state == SELECTED) {
+ uint8_t blockNo = receivedCmd[1];
+ memcpy(data_generic_trace, emulator + current_page*page_size + blockNo*8, 8 * 4);
+ AppendCrc(data_generic_trace, 8 * 4);
+ trace_data = data_generic_trace;
+ trace_data_size = 8 * 4 + 2;
+ CodeIso15693AsTag(trace_data, trace_data_size);
+ memcpy(data_response, ToSend, ToSendMax);
+ modulated_response = data_response;
+ modulated_response_size = ToSendMax;
+ }
+
+ } else if (receivedCmd[0] == ICLASS_CMD_UPDATE && (len == 12 || len == 14)) {
+ // We're expected to respond with the data+crc, exactly what's already in the receivedCmd
+ // receivedCmd is now UPDATE 1b | ADDRESS 1b | DATA 8b | Signature 4b or CRC 2b
+ if (chip_state == SELECTED) {
+ uint8_t blockNo = receivedCmd[1];
+ if (blockNo == 2) { // update e-purse
+ memcpy(card_challenge_data, receivedCmd+2, 8);
+ CodeIso15693AsTag(card_challenge_data, sizeof(card_challenge_data));
+ memcpy(resp_cc, ToSend, ToSendMax);
+ resp_cc_len = ToSendMax;
+ cipher_state_KD[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_d);
+ cipher_state_KC[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_c);
+ if (simulationMode == ICLASS_SIM_MODE_FULL) {
+ memcpy(emulator + current_page*page_size + 8*2, card_challenge_data, 8);
+ }
+ } else if (blockNo == 3) { // update Kd
+ for (int i = 0; i < 8; i++) {
+ if (personalization_mode) {
+ diversified_key_d[i] = receivedCmd[2 + i];
+ } else {
+ diversified_key_d[i] ^= receivedCmd[2 + i];
+ }
+ }
+ cipher_state_KD[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_d);
+ if (simulationMode == ICLASS_SIM_MODE_FULL) {
+ memcpy(emulator + current_page*page_size + 8*3, diversified_key_d, 8);
+ }
+ } else if (blockNo == 4) { // update Kc
+ for (int i = 0; i < 8; i++) {
+ if (personalization_mode) {
+ diversified_key_c[i] = receivedCmd[2 + i];
+ } else {
+ diversified_key_c[i] ^= receivedCmd[2 + i];
+ }
+ }
+ cipher_state_KC[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_c);
+ if (simulationMode == ICLASS_SIM_MODE_FULL) {
+ memcpy(emulator + current_page*page_size + 8*4, diversified_key_c, 8);
+ }
+ } else if (simulationMode == ICLASS_SIM_MODE_FULL) { // update any other data block
+ memcpy(emulator + current_page*page_size + 8*blockNo, receivedCmd+2, 8);
+ }
+ memcpy(data_generic_trace, receivedCmd + 2, 8);
+ AppendCrc(data_generic_trace, 8);
+ trace_data = data_generic_trace;
+ trace_data_size = 10;
+ CodeIso15693AsTag(trace_data, trace_data_size);
+ memcpy(data_response, ToSend, ToSendMax);
+ modulated_response = data_response;
+ modulated_response_size = ToSendMax;
+ }
+
+ } else if (receivedCmd[0] == ICLASS_CMD_PAGESEL && len == 4) {
+ // Pagesel
+ // Chips with a single page will not answer to this command
+ // Otherwise, we should answer 8bytes (conf block 1) + 2bytes CRC
+ if (chip_state == SELECTED) {
+ if (simulationMode == ICLASS_SIM_MODE_FULL && max_page > 0) {
+ current_page = receivedCmd[1];
+ memcpy(data_generic_trace, emulator + current_page*page_size + 8*1, 8);
+ memcpy(diversified_key_d, emulator + current_page*page_size + 8*3, 8);
+ memcpy(diversified_key_c, emulator + current_page*page_size + 8*4, 8);
+ cipher_state = &cipher_state_KD[current_page];
+ personalization_mode = data_generic_trace[7] & 0x80;
+ AppendCrc(data_generic_trace, 8);
+ trace_data = data_generic_trace;
+ trace_data_size = 10;
+ CodeIso15693AsTag(trace_data, trace_data_size);
+ memcpy(data_response, ToSend, ToSendMax);
+ modulated_response = data_response;
+ modulated_response_size = ToSendMax;
+ }
+ }
+
+ } else if (receivedCmd[0] == 0x26 && len == 5) {
+ // standard ISO15693 INVENTORY command. Ignore.
+
+ } else {
+ // don't know how to handle this command
+ char debug_message[250]; // should be enough
+ sprintf(debug_message, "Unhandled command (len = %d) received from reader:", len);
+ for (int i = 0; i < len && strlen(debug_message) < sizeof(debug_message) - 3 - 1; i++) {
+ sprintf(debug_message + strlen(debug_message), " %02x", receivedCmd[i]);
+ }
+ Dbprintf("%s", debug_message);
+ // Do not respond
+ }
+
+ /**
+ A legit tag has about 273,4us delay between reader EOT and tag SOF.
+ **/
+ if (modulated_response_size > 0) {
+ uint32_t response_time = reader_eof_time + DELAY_ICLASS_VCD_TO_VICC_SIM;
+ TransmitTo15693Reader(modulated_response, modulated_response_size, &response_time, 0, false);
+ LogTrace_ISO15693(trace_data, trace_data_size, response_time*32, response_time*32 + modulated_response_size/2, NULL, false);
+ }
+
+ }
+
+ if (buttonPressed)
+ {
+ DbpString("Button pressed");
+ }
+ return buttonPressed;