X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/db68bcdb06618c97a45a39ff5ed6acf666da62e2..7d4ba60e8e1b169822ff64a870b9f976585cb97c:/armsrc/iso14443a.c diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c index 89ef23d4..a8273e5e 100644 --- a/armsrc/iso14443a.c +++ b/armsrc/iso14443a.c @@ -189,33 +189,16 @@ void iso14a_set_trigger(bool enable) { void iso14a_set_timeout(uint32_t timeout) { - iso14a_timeout = timeout; - if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443A Timeout set to %ld (%dms)", iso14a_timeout, iso14a_timeout / 106); + // adjust timeout by FPGA delays and 2 additional ssp_frames to detect SOF + iso14a_timeout = timeout + (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/(16*8) + 2; + if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443A Timeout set to %ld (%dms)", timeout, timeout / 106); } -static void iso14a_set_ATS_timeout(uint8_t *ats) { - - uint8_t tb1; - uint8_t fwi; - uint32_t fwt; - - if (ats[0] > 1) { // there is a format byte T0 - if ((ats[1] & 0x20) == 0x20) { // there is an interface byte TB(1) - if ((ats[1] & 0x10) == 0x10) { // there is an interface byte TA(1) preceding TB(1) - tb1 = ats[3]; - } else { - tb1 = ats[2]; - } - fwi = (tb1 & 0xf0) >> 4; // frame waiting indicator (FWI) - fwt = 256 * 16 * (1 << fwi); // frame waiting time (FWT) in 1/fc - - iso14a_set_timeout(fwt/(8*16)); - } - } +uint32_t iso14a_get_timeout(void) { + return iso14a_timeout - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/(16*8) - 2; } - //----------------------------------------------------------------------------- // Generate the parity value for a byte sequence // @@ -1277,7 +1260,7 @@ static void PrepareDelayedTransfer(uint16_t delay) // Transmit the command (to the tag) that was placed in ToSend[]. // Parameter timing: // if NULL: transfer at next possible time, taking into account -// request guard time and frame delay time +// request guard time, startup frame guard time and frame delay time // if == 0: transfer immediately and return time of transfer // if != 0: delay transfer until time specified //------------------------------------------------------------------------------------- @@ -1685,6 +1668,59 @@ int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) return Demod.len; } + +static void iso14a_set_ATS_times(uint8_t *ats) { + + uint8_t tb1; + uint8_t fwi, sfgi; + uint32_t fwt, sfgt; + + if (ats[0] > 1) { // there is a format byte T0 + if ((ats[1] & 0x20) == 0x20) { // there is an interface byte TB(1) + if ((ats[1] & 0x10) == 0x10) { // there is an interface byte TA(1) preceding TB(1) + tb1 = ats[3]; + } else { + tb1 = ats[2]; + } + fwi = (tb1 & 0xf0) >> 4; // frame waiting time integer (FWI) + if (fwi != 15) { + fwt = 256 * 16 * (1 << fwi); // frame waiting time (FWT) in 1/fc + iso14a_set_timeout(fwt/(8*16)); + } + sfgi = tb1 & 0x0f; // startup frame guard time integer (SFGI) + if (sfgi != 0 && sfgi != 15) { + sfgt = 256 * 16 * (1 << sfgi); // startup frame guard time (SFGT) in 1/fc + NextTransferTime = MAX(NextTransferTime, Demod.endTime + (sfgt - DELAY_AIR2ARM_AS_READER - DELAY_ARM2AIR_AS_READER)/16); + } + } + } +} + + +static int GetATQA(uint8_t *resp, uint8_t *resp_par) { + +#define WUPA_RETRY_TIMEOUT 10 // 10ms + uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP + + uint32_t save_iso14a_timeout = iso14a_get_timeout(); + iso14a_set_timeout(1236/(16*8)+1); // response to WUPA is expected at exactly 1236/fc. No need to wait longer. + + uint32_t start_time = GetTickCount(); + int len; + + // we may need several tries if we did send an unknown command or a wrong authentication before... + do { + // Broadcast for a card, WUPA (0x52) will force response from all cards in the field + ReaderTransmitBitsPar(wupa, 7, NULL, NULL); + // Receive the ATQA + len = ReaderReceive(resp, resp_par); + } while (len == 0 && GetTickCount() <= start_time + WUPA_RETRY_TIMEOUT); + + iso14a_set_timeout(save_iso14a_timeout); + return len; +} + + // performs iso14443a anticollision (optional) and card select procedure // fills the uid and cuid pointer unless NULL // fills the card info record unless NULL @@ -1692,7 +1728,6 @@ int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) // and num_cascades must be set (1: 4 Byte UID, 2: 7 Byte UID, 3: 10 Byte UID) // requests ATS unless no_rats is true int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, uint32_t *cuid_ptr, bool anticollision, uint8_t num_cascades, bool no_rats) { - uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP uint8_t sel_all[] = { 0x93,0x20 }; uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00}; uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0 @@ -1712,11 +1747,9 @@ int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, u p_hi14a_card->ats_len = 0; } - // Broadcast for a card, WUPA (0x52) will force response from all cards in the field - ReaderTransmitBitsPar(wupa, 7, NULL, NULL); - - // Receive the ATQA - if(!ReaderReceive(resp, resp_par)) return 0; + if (!GetATQA(resp, resp_par)) { + return 0; + } if(p_hi14a_card) { memcpy(p_hi14a_card->atqa, resp, 2); @@ -1845,8 +1878,9 @@ int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, u // reset the PCB block number iso14_pcb_blocknum = 0; - // set default timeout based on ATS - iso14a_set_ATS_timeout(resp); + // set default timeout and delay next transfer based on ATS + iso14a_set_ATS_times(resp); + } return 1; } @@ -1922,9 +1956,9 @@ int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) { } else{ // S-Block WTX while((data_bytes[0] & 0xF2) == 0xF2) { - uint32_t save_iso14a_timeout = iso14a_timeout; + uint32_t save_iso14a_timeout = iso14a_get_timeout(); // temporarily increase timeout - iso14a_timeout = MAX((data_bytes[1] & 0x3f) * iso14a_timeout, MAX_ISO14A_TIMEOUT); + iso14a_set_timeout(MAX((data_bytes[1] & 0x3f) * save_iso14a_timeout, MAX_ISO14A_TIMEOUT)); // Transmit WTX back // byte1 - WTXM [1..59]. command FWT=FWT*WTXM data_bytes[1] = data_bytes[1] & 0x3f; // 2 high bits mandatory set to 0b @@ -1936,7 +1970,7 @@ int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) { len = ReaderReceive(data, parity); data_bytes = data; // restore timeout - iso14a_timeout = save_iso14a_timeout; + iso14a_set_timeout(save_iso14a_timeout); } // if we received an I- or R(ACK)-Block with a block number equal to the @@ -2117,9 +2151,7 @@ void ReaderMifare(bool first_try) uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE]; uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE]; - if (first_try) { - iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); - } + iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); // free eventually allocated BigBuf memory. We want all for tracing. BigBuf_free(); @@ -2127,9 +2159,9 @@ void ReaderMifare(bool first_try) clear_trace(); set_tracing(true); - byte_t nt_diff = 0; + uint8_t nt_diff = 0; uint8_t par[1] = {0}; // maximum 8 Bytes to be sent here, 1 byte parity is therefore enough - static byte_t par_low = 0; + static uint8_t par_low = 0; bool led_on = true; uint8_t uid[10] ={0}; uint32_t cuid; @@ -2137,11 +2169,11 @@ void ReaderMifare(bool first_try) uint32_t nt = 0; uint32_t previous_nt = 0; static uint32_t nt_attacked = 0; - byte_t par_list[8] = {0x00}; - byte_t ks_list[8] = {0x00}; + uint8_t par_list[8] = {0x00}; + uint8_t ks_list[8] = {0x00}; #define PRNG_SEQUENCE_LENGTH (1 << 16); - static uint32_t sync_time; + uint32_t sync_time = GetCountSspClk() & 0xfffffff8; static int32_t sync_cycles; int catch_up_cycles = 0; int last_catch_up = 0; @@ -2151,10 +2183,9 @@ void ReaderMifare(bool first_try) if (first_try) { mf_nr_ar3 = 0; - sync_time = GetCountSspClk() & 0xfffffff8; + par[0] = par_low = 0; sync_cycles = PRNG_SEQUENCE_LENGTH; // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the tag nonces). nt_attacked = 0; - par[0] = 0; } else { // we were unsuccessful on a previous call. Try another READER nonce (first 3 parity bits remain the same) @@ -2170,6 +2201,7 @@ void ReaderMifare(bool first_try) #define MAX_UNEXPECTED_RANDOM 4 // maximum number of unexpected (i.e. real) random numbers when trying to sync. Then give up. #define MAX_SYNC_TRIES 32 + #define SYNC_TIME_BUFFER 16 // if there is only SYNC_TIME_BUFFER left before next planned sync, wait for next PRNG cycle #define NUM_DEBUG_INFOS 8 // per strategy #define MAX_STRATEGY 3 uint16_t unexpected_random = 0; @@ -2219,8 +2251,8 @@ void ReaderMifare(bool first_try) sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles; catch_up_cycles = 0; - // if we missed the sync time already, advance to the next nonce repeat - while(GetCountSspClk() > sync_time) { + // if we missed the sync time already or are about to miss it, advance to the next nonce repeat + while(sync_time < GetCountSspClk() + SYNC_TIME_BUFFER) { elapsed_prng_sequences++; sync_time = (sync_time & 0xfffffff8) + sync_cycles; } @@ -2376,14 +2408,14 @@ void ReaderMifare(bool first_try) } } - byte_t buf[28]; + uint8_t buf[32]; memcpy(buf + 0, uid, 4); num_to_bytes(nt, 4, buf + 4); memcpy(buf + 8, par_list, 8); memcpy(buf + 16, ks_list, 8); - memcpy(buf + 24, mf_nr_ar, 4); + memcpy(buf + 24, mf_nr_ar, 8); - cmd_send(CMD_ACK, isOK, 0, 0, buf, 28); + cmd_send(CMD_ACK, isOK, 0, 0, buf, 32); // Thats it... FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); @@ -2448,7 +2480,7 @@ void RAMFUNC SniffMifare(uint8_t param) { for(uint32_t sniffCounter = 0; true; ) { if(BUTTON_PRESS()) { - DbpString("cancelled by button"); + DbpString("Canceled by button."); break; } @@ -2505,7 +2537,9 @@ void RAMFUNC SniffMifare(uint8_t param) { if(!TagIsActive) { // no need to try decoding tag data if the reader is sending uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4); if(MillerDecoding(readerdata, (sniffCounter-1)*4)) { - LED_C_INV(); + LED_B_ON(); + LED_C_OFF(); + if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, true)) break; /* And ready to receive another command. */ @@ -2520,7 +2554,8 @@ void RAMFUNC SniffMifare(uint8_t param) { if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending uint8_t tagdata = (previous_data << 4) | (*data & 0x0F); if(ManchesterDecoding(tagdata, 0, (sniffCounter-1)*4)) { - LED_C_INV(); + LED_B_OFF(); + LED_C_ON(); if (MfSniffLogic(receivedResponse, Demod.len, Demod.parity, Demod.bitCount, false)) break; @@ -2542,7 +2577,7 @@ void RAMFUNC SniffMifare(uint8_t param) { } // main cycle - DbpString("COMMAND FINISHED"); + DbpString("COMMAND FINISHED."); FpgaDisableSscDma(); MfSniffEnd();