From: pwpiwi Date: Sat, 5 Oct 2019 15:57:16 +0000 (+0200) Subject: fix 'hf iclass sim' X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/8efd0b80f2d11946b2fc0911cde939f9f93eb40f?hp=ae60ceca92b802fc980a883cb280d1c57b7932cf fix 'hf iclass sim' * fix tag response timing. iClass differs from ISO15693 in this respect. * speedup CodeIso15693AsTag() * TransmitTo15693Tag(): don't send unmodulated start of SOF * reduce modulation depth in hi_simulate.v * calculate CRC for configuration block when simulating * Show real response time instead of planned response time in 'hf list iclass' --- diff --git a/armsrc/iclass.c b/armsrc/iclass.c index d8f68c78..0e42fb06 100644 --- a/armsrc/iclass.c +++ b/armsrc/iclass.c @@ -59,6 +59,13 @@ static int timeout = 4096; +// iCLASS has a slightly different timing compared to ISO15693. According to the picopass data sheet the tag response is expected 330us after +// the reader command. This is measured from end of reader EOF to first modulation of the tag's SOF which starts with a 56,64us unmodulated period. +// 330us = 140 ssp_clk cycles @ 423,75kHz when simulating. +// 56,64us = 24 ssp_clk_cycles +#define DELAY_ICLASS_VCD_TO_VICC_SIM 140 +#define TAG_SOF_UNMODULATED 24 + //----------------------------------------------------------------------------- // The software UART that receives commands from the reader, and its state // variables. @@ -783,7 +790,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { State cipher_state_KC[8]; State cipher_state_KD[8]; State *cipher_state = &cipher_state_KD[0]; - + uint8_t *emulator = BigBuf_get_EM_addr(); uint8_t *csn = emulator; @@ -800,13 +807,12 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { AppendCrc(anticoll_data, 8); AppendCrc(csn_data, 8); - uint8_t diversified_key_d[8]; - uint8_t diversified_key_c[8]; + uint8_t diversified_key_d[8] = { 0x00 }; + uint8_t diversified_key_c[8] = { 0x00 }; uint8_t *diversified_key = diversified_key_d; - + // configuration block uint8_t conf_block[10] = {0x12, 0xFF, 0xFF, 0xFF, 0x7F, 0x1F, 0xFF, 0x3C, 0x00, 0x00}; - AppendCrc(conf_block, 8); // e-Purse uint8_t card_challenge_data[8] = { 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; @@ -819,6 +825,8 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { memcpy(diversified_key_c, emulator + 8 * 4, 8); // Kc } + AppendCrc(conf_block, 8); + // save card challenge for sim2,4 attack if (reader_mac_buf != NULL) { memcpy(reader_mac_buf, card_challenge_data, 8); @@ -836,7 +844,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { // chip memory may be divided in 8 pages uint8_t max_page = conf_block[4] & 0x10 ? 0 : 7; - + // Precalculate the cipher states, feeding it the CC cipher_state_KD[0] = opt_doTagMAC_1(card_challenge_data, diversified_key_d); cipher_state_KC[0] = opt_doTagMAC_1(card_challenge_data, diversified_key_c); @@ -849,7 +857,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { cipher_state_KC[i] = opt_doTagMAC_1(epurse, Kc); } } - + int exitLoop = 0; // Reader 0a // Tag 0f @@ -1073,7 +1081,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { cipher_state = &cipher_state_KD[current_page]; diversified_key = diversified_key_d; } else { - cipher_state = &cipher_state_KC[current_page]; + cipher_state = &cipher_state_KC[current_page]; diversified_key = diversified_key_c; } modulated_response = resp_cc; @@ -1082,7 +1090,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { trace_data_size = sizeof(card_challenge_data); } - } else if ((receivedCmd[0] == ICLASS_CMD_CHECK_KC + } 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) { @@ -1148,22 +1156,22 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { } else if (blockNo == 3) { // update Kd for (int i = 0; i < 8; i++) { if (personalization_mode) { - diversified_key_d[i] = receivedCmd[2 + i]; + 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); + 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 + } else if (blockNo == 4) { // update Kc for (int i = 0; i < 8; i++) { if (personalization_mode) { - diversified_key_c[i] = receivedCmd[2 + i]; + 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) { @@ -1171,7 +1179,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { } } 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; @@ -1185,20 +1193,20 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { } 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 (block) + 2bytes CRC + // 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); + 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); + memcpy(data_response, ToSend, ToSendMax); modulated_response = data_response; modulated_response_size = ToSendMax; } @@ -1219,11 +1227,11 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { } /** - A legit tag has about 311,5us delay between reader EOT and tag SOF. + 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_ISO15693_VCD_TO_VICC_SIM - DELAY_ARM_TO_READER_SIM; - TransmitTo15693Reader(modulated_response, modulated_response_size, response_time, false); + uint32_t response_time = reader_eof_time + DELAY_ICLASS_VCD_TO_VICC_SIM - TAG_SOF_UNMODULATED - DELAY_ARM_TO_READER_SIM; + TransmitTo15693Reader(modulated_response, modulated_response_size, &response_time, 0, false); LogTrace(trace_data, trace_data_size, response_time + DELAY_ARM_TO_READER_SIM, response_time + (modulated_response_size << 6) + DELAY_ARM_TO_READER_SIM, NULL, false); } @@ -1249,9 +1257,9 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) { * @param datain */ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain) { - + LED_A_ON(); - + uint32_t simType = arg0; uint32_t numberOfCSNS = arg1; @@ -1559,6 +1567,7 @@ static uint8_t handshakeIclassTag_ext(uint8_t *card_data, bool use_credit_key) { ReaderTransmitIClass(act_all, 1); // Card present? if (!ReaderReceiveIClass(resp)) return read_status;//Fail + //Send Identify ReaderTransmitIClass(identify, 1); //We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC diff --git a/armsrc/iso15693.c b/armsrc/iso15693.c index dbc1ca4c..85af0859 100644 --- a/armsrc/iso15693.c +++ b/armsrc/iso15693.c @@ -246,6 +246,8 @@ static void CodeIso15693AsReader256(uint8_t *cmd, int n) // } // } +static const uint8_t encode_4bits[16] = { 0xaa, 0x6a, 0x9a, 0x5a, 0xa6, 0x66, 0x96, 0x56, 0xa9, 0x69, 0x99, 0x59, 0xa5, 0x65, 0x95, 0x55 }; + void CodeIso15693AsTag(uint8_t *cmd, size_t len) { /* * SOF comprises 3 parts; @@ -280,16 +282,9 @@ void CodeIso15693AsTag(uint8_t *cmd, size_t len) { ToSend[++ToSendMax] = 0x1D; // 00011101 // data - for(int i = 0; i < len; i++) { - for(int j = 0; j < 8; j++) { - if ((cmd[i] >> j) & 0x01) { - ToSendStuffBit(0); - ToSendStuffBit(1); - } else { - ToSendStuffBit(1); - ToSendStuffBit(0); - } - } + for (int i = 0; i < len; i++) { + ToSend[++ToSendMax] = encode_4bits[cmd[i] & 0xF]; + ToSend[++ToSendMax] = encode_4bits[cmd[i] >> 4]; } // EOF @@ -327,19 +322,32 @@ static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time) //----------------------------------------------------------------------------- // Transmit the tag response (to the reader) that was placed in cmd[]. //----------------------------------------------------------------------------- -void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, bool slow) { +void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t *start_time, uint32_t slot_time, bool slow) { // don't use the FPGA_HF_SIMULATOR_MODULATE_424K_8BIT minor mode. It would spoil GetCountSspClk() FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K); - uint8_t shift_delay = start_time & 0x00000007; + uint32_t modulation_start_time = *start_time + 3 * 8; // no need to transfer the unmodulated start of SOF + + while (GetCountSspClk() > (modulation_start_time & 0xfffffff8) + 3) { // we will miss the intended time + if (slot_time) { + modulation_start_time += slot_time; // use next available slot + } else { + modulation_start_time = (modulation_start_time & 0xfffffff8) + 8; // next possible time + } + } + + while (GetCountSspClk() < (modulation_start_time & 0xfffffff8)) + /* wait */ ; - while (GetCountSspClk() < (start_time & 0xfffffff8)) ; + uint8_t shift_delay = modulation_start_time & 0x00000007; + + *start_time = modulation_start_time - 3 * 8; LED_C_ON(); uint8_t bits_to_shift = 0x00; uint8_t bits_to_send = 0x00; - for(size_t c = 0; c < len; c++) { - for (int i = 7; i >= 0; i--) { + for (size_t c = 0; c < len; c++) { + for (int i = (c==0?4:7); i >= 0; i--) { uint8_t cmd_bits = ((cmd[c] >> i) & 0x01) ? 0xff : 0x00; for (int j = 0; j < (slow?4:1); ) { if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { @@ -361,7 +369,6 @@ void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, } } LED_C_OFF(); - } @@ -1529,7 +1536,7 @@ void SimTagIso15693(uint32_t parameter, uint8_t *uid) if ((cmd_len >= 5) && (cmd[0] & ISO15693_REQ_INVENTORY) && (cmd[1] == ISO15693_INVENTORY)) { // TODO: check more flags bool slow = !(cmd[0] & ISO15693_REQ_DATARATE_HIGH); start_time = eof_time + DELAY_ISO15693_VCD_TO_VICC_SIM - DELAY_ARM_TO_READER_SIM; - TransmitTo15693Reader(ToSend, ToSendMax, start_time, slow); + TransmitTo15693Reader(ToSend, ToSendMax, &start_time, 0, slow); } Dbprintf("%d bytes read from reader:", cmd_len); diff --git a/armsrc/iso15693.h b/armsrc/iso15693.h index 7964d79e..7d2e7598 100644 --- a/armsrc/iso15693.h +++ b/armsrc/iso15693.h @@ -26,7 +26,7 @@ void CodeIso15693AsTag(uint8_t *cmd, size_t len); int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time); -void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, bool slow); +void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t *start_time, uint32_t slot_time, bool slow); void SnoopIso15693(void); void AcquireRawAdcSamplesIso15693(void); void ReaderIso15693(uint32_t parameter); diff --git a/fpga/fpga_hf.bit b/fpga/fpga_hf.bit index 1bd3c416..44b24280 100644 Binary files a/fpga/fpga_hf.bit and b/fpga/fpga_hf.bit differ diff --git a/fpga/hi_simulate.v b/fpga/hi_simulate.v index 097b8a08..5fc2e113 100644 --- a/fpga/hi_simulate.v +++ b/fpga/hi_simulate.v @@ -132,7 +132,7 @@ always @(*) // modulation than a real tag would. assign pwr_hi = 1'b0; // HF antenna connected to GND assign pwr_oe3 = 1'b0; // 10k Load -assign pwr_oe1 = modulating_carrier; // 33 Ohms Load +assign pwr_oe1 = 1'b0; // 33 Ohms Load assign pwr_oe4 = modulating_carrier; // 33 Ohms Load // This is all LF and doesn't matter