Merge pull request #551 from pwpiwi/remove_reveng

[proxmark3-svn] / armsrc / iso14443a.c

diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index ebbddbd89a29a02646945f0768fde298badc8daa..6703cc65c7286cd041e19fda40b29e02604e16a2 100644 (file)
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -81,6 +81,8 @@ typedef struct {
 } tUart;
 
 static uint32_t iso14a_timeout;
 } tUart;
 
 static uint32_t iso14a_timeout;

+#define MAX_ISO14A_TIMEOUT 524288
+

 int rsamples = 0;
 uint8_t trigger = 0;
 // the block number for the ISO14443-4 PCB
 int rsamples = 0;
 uint8_t trigger = 0;
 // the block number for the ISO14443-4 PCB


@@ -187,33 +189,16 @@ void iso14a_set_trigger(bool enable) {
 
 
 void iso14a_set_timeout(uint32_t timeout) {
 
 
 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
 //
 //-----------------------------------------------------------------------------
 // Generate the parity value for a byte sequence
 //


@@ -1275,7 +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
 // 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
 //-------------------------------------------------------------------------------------
 // if == 0:    transfer immediately and return time of transfer
 // if != 0: delay transfer until time specified
 //-------------------------------------------------------------------------------------


@@ -1683,6 +1668,59 @@ int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity)
        return Demod.len;
 }
 
        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
 // performs iso14443a anticollision (optional) and card select procedure
 // fills the uid and cuid pointer unless NULL
 // fills the card info record unless NULL


@@ -1690,7 +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) {
 // 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
        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


@@ -1710,11 +1747,9 @@ int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, u
                p_hi14a_card->ats_len = 0;
        }
 
                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);
 
        if(p_hi14a_card) {
                memcpy(p_hi14a_card->atqa, resp, 2);


@@ -1843,8 +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;
 
                // 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;       
 }
        }
        return 1;       
 }


@@ -1920,6 +1956,9 @@ int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
        } else{
                // S-Block WTX 
                while((data_bytes[0] & 0xF2) == 0xF2) {
        } else{
                // S-Block WTX 
                while((data_bytes[0] & 0xF2) == 0xF2) {

+                       uint32_t save_iso14a_timeout = iso14a_get_timeout();
+                       // temporarily increase 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
                        // 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


@@ -1927,9 +1966,11 @@ int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
                        AppendCrc14443a(data_bytes, len - 2);
                        // transmit S-Block
                        ReaderTransmit(data_bytes, len, NULL);
                        AppendCrc14443a(data_bytes, len - 2);
                        // transmit S-Block
                        ReaderTransmit(data_bytes, len, NULL);

-                       // retrieve the result again 
+                       // retrieve the result again (with increased timeout) 

                        len = ReaderReceive(data, parity);
                        data_bytes = data;
                        len = ReaderReceive(data, parity);
                        data_bytes = data;

+                       // restore timeout
+                       iso14a_set_timeout(save_iso14a_timeout);

                }
 
                // if we received an I- or R(ACK)-Block with a block number equal to the
                }
 
                // if we received an I- or R(ACK)-Block with a block number equal to the


@@ -2441,7 +2482,7 @@ void RAMFUNC SniffMifare(uint8_t param) {
        for(uint32_t sniffCounter = 0; true; ) {
        
                if(BUTTON_PRESS()) {
        for(uint32_t sniffCounter = 0; true; ) {
        
                if(BUTTON_PRESS()) {

-                       DbpString("cancelled by button");
+                       DbpString("Canceled by button.");

                        break;
                }
 
                        break;
                }
 


@@ -2498,7 +2539,9 @@ 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)) {
                        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. */
                                        if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, true)) break;
 
                                        /* And ready to receive another command. */


@@ -2513,7 +2556,8 @@ 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)) {
                        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;
 
 
                                        if (MfSniffLogic(receivedResponse, Demod.len, Demod.parity, Demod.bitCount, false)) break;
 


@@ -2535,7 +2579,7 @@ void RAMFUNC SniffMifare(uint8_t param) {
 
        } // main cycle
 
 
        } // main cycle
 

-       DbpString("COMMAND FINISHED");
+       DbpString("COMMAND FINISHED.");

 
        FpgaDisableSscDma();
        MfSniffEnd();
 
        FpgaDisableSscDma();
        MfSniffEnd();