]> cvs.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/iso14443a.c
Iceman's Issue #96 fix
[proxmark3-svn] / armsrc / iso14443a.c
index 336250edec61736f4976695b7852bd90c73edbaa..ac839cfdc081049ac8ceccaa784c41306158c04e 100644 (file)
@@ -20,7 +20,7 @@
 #include "iso14443a.h"
 #include "crapto1.h"
 #include "mifareutil.h"
-
+#include "BigBuf.h"
 static uint32_t iso14a_timeout;
 int rsamples = 0;
 uint8_t trigger = 0;
@@ -141,16 +141,40 @@ const uint8_t OddByteParity[256] = {
   1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1
 };
 
+
 void iso14a_set_trigger(bool enable) {
        trigger = 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);
+}
+
+
+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));
+               }
+       }
 }
 
+
 //-----------------------------------------------------------------------------
 // Generate the parity value for a byte sequence
 //
@@ -243,26 +267,27 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
 
        Uart.twoBits = (Uart.twoBits << 8) | bit;
        
-       if (Uart.state == STATE_UNSYNCD) {                                                                                              // not yet synced
+       if (Uart.state == STATE_UNSYNCD) {                                                                                      // not yet synced
        
-               if (Uart.highCnt < 7) {                                                                                                 // wait for a stable unmodulated signal
+               if (Uart.highCnt < 2) {                                                                                                 // wait for a stable unmodulated signal
                        if (Uart.twoBits == 0xffff) {
                                Uart.highCnt++;
                        } else {
                                Uart.highCnt = 0;
                        }
                } else {        
-                       Uart.syncBit = 0xFFFF; // not set
-                       // look for 00xx1111 (the start bit)
-                       if              ((Uart.twoBits & 0x6780) == 0x0780) Uart.syncBit = 7; 
-                       else if ((Uart.twoBits & 0x33C0) == 0x03C0) Uart.syncBit = 6;
-                       else if ((Uart.twoBits & 0x19E0) == 0x01E0) Uart.syncBit = 5;
-                       else if ((Uart.twoBits & 0x0CF0) == 0x00F0) Uart.syncBit = 4;
-                       else if ((Uart.twoBits & 0x0678) == 0x0078) Uart.syncBit = 3;
-                       else if ((Uart.twoBits & 0x033C) == 0x003C) Uart.syncBit = 2;
-                       else if ((Uart.twoBits & 0x019E) == 0x001E) Uart.syncBit = 1;
-                       else if ((Uart.twoBits & 0x00CF) == 0x000F) Uart.syncBit = 0;
-                       if (Uart.syncBit != 0xFFFF) {
+                       Uart.syncBit = 0xFFFF;                                                                                          // not set
+                                                                                                                                                               // we look for a ...1111111100x11111xxxxxx pattern (the start bit)
+                       if              ((Uart.twoBits & 0xDF00) == 0x1F00) Uart.syncBit = 8;           // mask is   11x11111 xxxxxxxx, 
+                                                                                                                                                               // check for 00x11111 xxxxxxxx
+                       else if ((Uart.twoBits & 0xEF80) == 0x8F80) Uart.syncBit = 7;           // both masks shifted right one bit, left padded with '1'
+                       else if ((Uart.twoBits & 0xF7C0) == 0xC7C0) Uart.syncBit = 6;           // ...
+                       else if ((Uart.twoBits & 0xFBE0) == 0xE3E0) Uart.syncBit = 5;
+                       else if ((Uart.twoBits & 0xFDF0) == 0xF1F0) Uart.syncBit = 4;
+                       else if ((Uart.twoBits & 0xFEF8) == 0xF8F8) Uart.syncBit = 3;
+                       else if ((Uart.twoBits & 0xFF7C) == 0xFC7C) Uart.syncBit = 2;
+                       else if ((Uart.twoBits & 0xFFBE) == 0xFE3E) Uart.syncBit = 1;
+                       if (Uart.syncBit != 0xFFFF) {                                                                           // found a sync bit
                                Uart.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8);
                                Uart.startTime -= Uart.syncBit;
                                Uart.endTime = Uart.startTime;
@@ -275,11 +300,9 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
                if (IsMillerModulationNibble1(Uart.twoBits >> Uart.syncBit)) {                  
                        if (IsMillerModulationNibble2(Uart.twoBits >> Uart.syncBit)) {          // Modulation in both halves - error
                                UartReset();
-                               Uart.highCnt = 6;
                        } else {                                                                                                                        // Modulation in first half = Sequence Z = logic "0"
                                if (Uart.state == STATE_MILLER_X) {                                                             // error - must not follow after X
                                        UartReset();
-                                       Uart.highCnt = 6;
                                } else {
                                        Uart.bitCount++;
                                        Uart.shiftReg = (Uart.shiftReg >> 1);                                           // add a 0 to the shiftreg
@@ -334,12 +357,13 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
                                        if (Uart.len) {
                                                return TRUE;                                                                                    // we are finished with decoding the raw data sequence
                                        } else {
-                                               UartReset();                                    // Nothing receiver - start over
+                                               UartReset();                                                                                    // Nothing received - start over
+                                               Uart.highCnt = 1;
                                        }
                                }
                                if (Uart.state == STATE_START_OF_COMMUNICATION) {                               // error - must not follow directly after SOC
                                        UartReset();
-                                       Uart.highCnt = 6;
+                                       Uart.highCnt = 1;
                                } else {                                                                                                                // a logic "0"
                                        Uart.bitCount++;
                                        Uart.shiftReg = (Uart.shiftReg >> 1);                                           // add a 0 to the shiftreg
@@ -549,8 +573,8 @@ void RAMFUNC SnoopIso14443a(uint8_t param) {
        uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
 
        // init trace buffer
-       iso14a_clear_trace();
-       iso14a_set_tracing(TRUE);
+       clear_trace();
+       set_tracing(TRUE);
 
        uint8_t *data = dmaBuf;
        uint8_t previous_data = 0;
@@ -674,7 +698,7 @@ void RAMFUNC SnoopIso14443a(uint8_t param) {
 
        FpgaDisableSscDma();
        Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len);
-       Dbprintf("traceLen=%d, Uart.output[0]=%08x", traceLen, (uint32_t)Uart.output[0]);
+       Dbprintf("traceLen=%d, Uart.output[0]=%08x", BigBuf_get_traceLen(), (uint32_t)Uart.output[0]);
        LEDsoff();
 }
 
@@ -1010,8 +1034,8 @@ void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
        free_buffer_pointer = BigBuf_malloc(ALLOCATED_TAG_MODULATION_BUFFER_SIZE);
 
        // clear trace
-    iso14a_clear_trace();
-       iso14a_set_tracing(TRUE);
+       clear_trace();
+       set_tracing(TRUE);
 
        // Prepare the responses of the anticollision phase
        // there will be not enough time to do this at the moment the reader sends it REQA
@@ -1358,6 +1382,7 @@ void CodeIso14443aAsReaderPar(const uint8_t *cmd, uint16_t len, const uint8_t *p
   CodeIso14443aBitsAsReaderPar(cmd, len*8, parity);
 }
 
+
 //-----------------------------------------------------------------------------
 // Wait for commands from reader
 // Stop when button is pressed (return 1) or field was gone (return 2)
@@ -1380,9 +1405,9 @@ static int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity)
        // Set ADC to read field strength
        AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST;
        AT91C_BASE_ADC->ADC_MR =
-                               ADC_MODE_PRESCALE(32) |
-                               ADC_MODE_STARTUP_TIME(16) |
-                               ADC_MODE_SAMPLE_HOLD_TIME(8);
+                               ADC_MODE_PRESCALE(63) |
+                               ADC_MODE_STARTUP_TIME(1) |
+                               ADC_MODE_SAMPLE_HOLD_TIME(15);
        AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF);
        // start ADC
        AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
@@ -1392,7 +1417,7 @@ static int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity)
 
        // Clear RXRDY:
     uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-
+       
        for(;;) {
                WDT_HIT();
 
@@ -1404,7 +1429,7 @@ static int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity)
                        analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF];
                        AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
                        if (analogCnt >= 32) {
-                               if ((33000 * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
+                               if ((MAX_ADC_HF_VOLTAGE * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
                                        vtime = GetTickCount();
                                        if (!timer) timer = vtime;
                                        // 50ms no field --> card to idle state
@@ -1479,14 +1504,15 @@ static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNe
        }
 
        // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
-       for (i = 0; i < 2 ; ) {
+       uint8_t fpga_queued_bits = FpgaSendQueueDelay >> 3;
+       for (i = 0; i <= fpga_queued_bits/8 + 1; ) {
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
                        AT91C_BASE_SSC->SSC_THR = SEC_F;
                        FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        i++;
                }
        }
-       
+
        LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0);
 
        return 0;
@@ -1588,7 +1614,7 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receive
 
        // clear RXRDY:
     uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-       
+
        c = 0;
        for(;;) {
                WDT_HIT();
@@ -1598,7 +1624,7 @@ static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receive
                        if(ManchesterDecoding(b, offset, 0)) {
                                NextTransferTime = MAX(NextTransferTime, Demod.endTime - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/16 + FRAME_DELAY_TIME_PICC_TO_PCD);
                                return TRUE;
-                       } else if (c++ > iso14a_timeout) {
+                       } else if (c++ > iso14a_timeout && Demod.state == DEMOD_UNSYNCD) {
                                return FALSE; 
                        }
                }
@@ -1796,6 +1822,10 @@ 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);
+
        return 1;       
 }
 
@@ -1860,17 +1890,18 @@ void ReaderIso14443a(UsbCommand *c)
 {
        iso14a_command_t param = c->arg[0];
        uint8_t *cmd = c->d.asBytes;
-       size_t len = c->arg[1];
-       size_t lenbits = c->arg[2];
+       size_t len = c->arg[1] & 0xffff;
+       size_t lenbits = c->arg[1] >> 16;
+       uint32_t timeout = c->arg[2];
        uint32_t arg0 = 0;
        byte_t buf[USB_CMD_DATA_SIZE];
        uint8_t par[MAX_PARITY_SIZE];
   
        if(param & ISO14A_CONNECT) {
-               iso14a_clear_trace();
+               clear_trace();
        }
 
-       iso14a_set_tracing(TRUE);
+       set_tracing(TRUE);
 
        if(param & ISO14A_REQUEST_TRIGGER) {
                iso14a_set_trigger(TRUE);
@@ -1886,7 +1917,7 @@ void ReaderIso14443a(UsbCommand *c)
        }
 
        if(param & ISO14A_SET_TIMEOUT) {
-               iso14a_set_timeout(c->arg[2]);
+               iso14a_set_timeout(timeout);
        }
 
        if(param & ISO14A_APDU) {
@@ -1966,8 +1997,8 @@ void ReaderMifare(bool first_try)
        // free eventually allocated BigBuf memory. We want all for tracing.
        BigBuf_free();
        
-       iso14a_clear_trace();
-       iso14a_set_tracing(TRUE);
+       clear_trace();
+       set_tracing(TRUE);
 
        byte_t nt_diff = 0;
        uint8_t par[1] = {0};   // maximum 8 Bytes to be sent here, 1 byte parity is therefore enough
@@ -2140,7 +2171,7 @@ void ReaderMifare(bool first_try)
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        LEDsoff();
 
-       iso14a_set_tracing(FALSE);
+       set_tracing(FALSE);
 }
 
 /**
@@ -2197,9 +2228,10 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
 
        // free eventually allocated BigBuf memory but keep Emulator Memory
        BigBuf_free_keep_EM();
+
        // clear trace
-    iso14a_clear_trace();
-       iso14a_set_tracing(TRUE);
+       clear_trace();
+       set_tracing(TRUE);
 
        // Authenticate response - nonce
        uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
@@ -2261,10 +2293,8 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                WDT_HIT();
 
                // find reader field
-               // Vref = 3300mV, and an 10:1 voltage divider on the input
-               // can measure voltages up to 33000 mV
                if (cardSTATE == MFEMUL_NOFIELD) {
-                       vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10;
+                       vHf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;
                        if (vHf > MF_MINFIELDV) {
                                cardSTATE_TO_IDLE();
                                LED_A_ON();
@@ -2339,6 +2369,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                                        LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
                                        break;
                                }
+
                                uint32_t ar = bytes_to_num(receivedCmd, 4);
                                uint32_t nr = bytes_to_num(&receivedCmd[4], 4);
 
@@ -2445,6 +2476,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                                                ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); 
                                                num_to_bytes(ans, 4, rAUTH_AT);
                                        }
+
                                        EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
                                        //Dbprintf("Sending rAUTH %02x%02x%02x%02x", rAUTH_AT[0],rAUTH_AT[1],rAUTH_AT[2],rAUTH_AT[3]);
                                        cardSTATE = MFEMUL_AUTH1;
@@ -2625,7 +2657,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                if(ar_nr_collected > 1) {
                        Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:");
                        Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x %08x %08x",
-                                        ar_nr_responses[0], // UID
+                                       ar_nr_responses[0], // UID
                                        ar_nr_responses[1], //NT
                                        ar_nr_responses[2], //AR1
                                        ar_nr_responses[3], //NR1
@@ -2644,7 +2676,8 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                        }
                }
        }
-       if (MF_DBGLEVEL >= 1)   Dbprintf("Emulator stopped. Tracing: %d  trace length: %d ",    tracing, traceLen);
+       if (MF_DBGLEVEL >= 1)   Dbprintf("Emulator stopped. Tracing: %d  trace length: %d ",    tracing, BigBuf_get_traceLen());
+       
 }
 
 
@@ -2661,8 +2694,8 @@ void RAMFUNC SniffMifare(uint8_t param) {
        // C(red) A(yellow) B(green)
        LEDsoff();
        // init trace buffer
-       iso14a_clear_trace();
-       iso14a_set_tracing(TRUE);
+       clear_trace();
+       set_tracing(TRUE);
 
        // The command (reader -> tag) that we're receiving.
        // The length of a received command will in most cases be no more than 18 bytes.
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