]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/iso14443a.c
ADD: ISO7816-4 annotation in "hf list".
[proxmark3-svn] / armsrc / iso14443a.c
index 200e31f25ee1a2991067948232bb8a11138d3648..9b7efaf6834bb5e4e98b4ca72be5470348c35607 100644 (file)
@@ -568,11 +568,8 @@ void RAMFUNC SniffIso14443a(uint8_t param) {
        
        LEDsoff();
 
-       // We won't start recording the frames that we acquire until we trigger;
-       // a good trigger condition to get started is probably when we see a
-       // response from the tag.
-       // triggered == FALSE -- to wait first for card
-       bool triggered = !(param & 0x03); 
+
+       iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
        
        // Allocate memory from BigBuf for some buffers
        // free all previous allocations first
@@ -600,8 +597,6 @@ void RAMFUNC SniffIso14443a(uint8_t param) {
        bool TagIsActive = FALSE;
        bool ReaderIsActive = FALSE;
        
-       iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
-
        // Set up the demodulator for tag -> reader responses.
        DemodInit(receivedResponse, receivedResponsePar);
        
@@ -611,6 +606,12 @@ void RAMFUNC SniffIso14443a(uint8_t param) {
        // Setup and start DMA.
        FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
        
+       // We won't start recording the frames that we acquire until we trigger;
+       // a good trigger condition to get started is probably when we see a
+       // response from the tag.
+       // triggered == FALSE -- to wait first for card
+       bool triggered = !(param & 0x03); 
+       
        // And now we loop, receiving samples.
        for(uint32_t rsamples = 0; TRUE; ) {
 
@@ -912,7 +913,9 @@ bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffe
 // Coded responses need one byte per bit to transfer (data, parity, start, stop, correction) 
 // 28 * 8 data bits, 28 * 1 parity bits, 7 start bits, 7 stop bits, 7 correction bits
 // -> need 273 bytes buffer
-#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 273
+// 44 * 8 data bits, 44 * 1 parity bits, 9 start bits, 9 stop bits, 9 correction bits --370
+// 47 * 8 data bits, 47 * 1 parity bits, 10 start bits, 10 stop bits, 10 correction bits 
+#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 453 
 
 bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) {
   // Retrieve and store the current buffer index
@@ -945,7 +948,10 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
        uint8_t ar_nr_collected = 0;
        
        uint8_t sak;
-
+                                       
+       // PACK response to PWD AUTH for EV1/NTAG
+       uint8_t response8[4];
+       
        // The first response contains the ATQA (note: bytes are transmitted in reverse order).
        uint8_t response1[2];
        
@@ -958,7 +964,7 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                } break;
                case 2: { // MIFARE Ultralight
                        // Says: I am a stupid memory tag, no crypto
-                       response1[0] = 0x04;
+                       response1[0] = 0x44;
                        response1[1] = 0x00;
                        sak = 0x00;
                } break;
@@ -986,6 +992,16 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                        response1[1] = 0x00;
                        sak = 0x09;
                } break;
+               case 7: { // NTAG?
+                       // Says: I am a NTAG, 
+                       response1[0] = 0x44;
+                       response1[1] = 0x00;
+                       sak = 0x00;
+                       // PACK
+                       response8[0] = 0x80;
+                       response8[1] = 0x80;
+                       ComputeCrc14443(CRC_14443_A, response8, 2, &response8[2], &response8[3]);
+               } break;                
                default: {
                        Dbprintf("Error: unkown tagtype (%d)",tagType);
                        return;
@@ -1034,7 +1050,7 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
        response3a[0] = sak & 0xFB;
        ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
 
-       uint8_t response5[] = { 0x01, 0x02, 0x03, 0x04 }; // Very random tag nonce
+       uint8_t response5[] = { 0x01, 0x01, 0x01, 0x01 }; // Very random tag nonce
        uint8_t response6[] = { 0x04, 0x58, 0x80, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS: 
        // Format byte = 0x58: FSCI=0x08 (FSC=256), TA(1) and TC(1) present, 
        // TA(1) = 0x80: different divisors not supported, DR = 1, DS = 1
@@ -1042,7 +1058,14 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
        // TC(1) = 0x02: CID supported, NAD not supported
        ComputeCrc14443(CRC_14443_A, response6, 4, &response6[4], &response6[5]);
 
-       #define TAG_RESPONSE_COUNT 7
+       // Prepare GET_VERSION (different for EV-1 / NTAG)
+       //uint8_t response7_EV1[] = {0x00, 0x04, 0x03, 0x01, 0x01, 0x00, 0x0b, 0x03, 0xfd, 0xf7};  //EV1 48bytes VERSION.
+       uint8_t response7_NTAG[] = {0x00, 0x04, 0x04, 0x02, 0x01, 0x00, 0x11, 0x03, 0x01, 0x9e}; //NTAG 215
+       
+       // Prepare CHK_TEARING
+       uint8_t response9[] =  {0xBD,0x90,0x3f};
+       
+       #define TAG_RESPONSE_COUNT 10
        tag_response_info_t responses[TAG_RESPONSE_COUNT] = {
                { .response = response1,  .response_n = sizeof(response1)  },  // Answer to request - respond with card type
                { .response = response2,  .response_n = sizeof(response2)  },  // Anticollision cascade1 - respond with uid
@@ -1051,6 +1074,9 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                { .response = response3a, .response_n = sizeof(response3a) },  // Acknowledge select - cascade 2
                { .response = response5,  .response_n = sizeof(response5)  },  // Authentication answer (random nonce)
                { .response = response6,  .response_n = sizeof(response6)  },  // dummy ATS (pseudo-ATR), answer to RATS
+               { .response = response7_NTAG,  .response_n = sizeof(response7_NTAG)  },  // EV1/NTAG GET_VERSION response
+               { .response = response8,   .response_n = sizeof(response8) },  // EV1/NTAG PACK response
+               { .response = response9,   .response_n = sizeof(response9) }  // EV1/NTAG CHK_TEAR response
        };
 
        // Allocate 512 bytes for the dynamic modulation, created when the reader queries for it
@@ -1066,6 +1092,9 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                .modulation_n = 0
        };
   
+       // We need to listen to the high-frequency, peak-detected path.
+       iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+
        BigBuf_free_keep_EM();
 
        // allocate buffers:
@@ -1094,9 +1123,6 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
        int happened2 = 0;
        int cmdsRecvd = 0;
 
-       // We need to listen to the high-frequency, peak-detected path.
-       iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
-
        cmdsRecvd = 0;
        tag_response_info_t* p_response;
 
@@ -1126,10 +1152,74 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x95) {   // Received a SELECT (cascade 2)
                        p_response = &responses[4]; order = 30;
                } else if(receivedCmd[0] == 0x30) {     // Received a (plain) READ
-                       EmSendCmdEx(data+(4*receivedCmd[1]),16,false);
-                       // Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
-                       // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
+                       uint8_t block = receivedCmd[1];
+                       if ( tagType == 7 ) {
+                               uint8_t start = 4 * block;
+                               
+                               if ( block < 4 ) {
+                                   //NTAG 215
+                                       uint8_t blockdata[50] = {
+                                       data[0],data[1],data[2], 0x88 ^ data[0] ^ data[1] ^ data[2],
+                                       data[3],data[4],data[5],data[6],
+                                       data[3] ^ data[4] ^ data[5] ^ data[6],0x48,0x0f,0xe0,
+                                       0xe1,0x10,0x12,0x00,
+                                       0x03,0x00,0xfe,0x00, 
+                                       0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+                                       0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+                                       0x00,0x00,0x00,0x00,
+                                       0x00,0x00};
+                                       AppendCrc14443a(blockdata+start, 16);
+                                       EmSendCmdEx( blockdata+start, MAX_MIFARE_FRAME_SIZE, false);
+                               } else {        
+                                       uint8_t emdata[MAX_MIFARE_FRAME_SIZE];
+                                       emlGetMemBt( emdata, start, 16);
+                                       AppendCrc14443a(emdata, 16);
+                                       EmSendCmdEx(emdata, sizeof(emdata), false);                             
+                               }
+                               p_response = NULL;
+                               
+                       } else {                        
+                               EmSendCmdEx(data+(4*block),16,false);
+                               // Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
+                               // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
+                               p_response = NULL;
+                       }
+               } else if(receivedCmd[0] == 0x3A) {     // Received a FAST READ (ranged read) -- just returns all zeros.
+                               
+                               uint8_t emdata[MAX_FRAME_SIZE];
+                               int start =  receivedCmd[1] * 4;
+                               int len   = (receivedCmd[2] - receivedCmd[1] + 1) * 4;
+                               emlGetMemBt( emdata, start, len);
+                               AppendCrc14443a(emdata, len);
+                               EmSendCmdEx(emdata, len+2, false);                              
+                               p_response = NULL;
+                               
+               } else if(receivedCmd[0] == 0x3C && tagType == 7) {     // Received a READ SIGNATURE -- 
+                               // ECC data,  taken from a NTAG215 amiibo token. might work. LEN: 32, + 2 crc
+                               uint8_t data[] = {0x56,0x06,0xa6,0x4f,0x43,0x32,0x53,0x6f,
+                                                                 0x43,0xda,0x45,0xd6,0x61,0x38,0xaa,0x1e,
+                                                                 0xcf,0xd3,0x61,0x36,0xca,0x5f,0xbb,0x05,
+                                                                 0xce,0x21,0x24,0x5b,0xa6,0x7a,0x79,0x07,
+                                                                 0x00,0x00};
+                               AppendCrc14443a(data, sizeof(data)-2);
+                               EmSendCmdEx(data,sizeof(data),false);
+                               p_response = NULL;                                      
+               } else if(receivedCmd[0] == 0x39 && tagType == 7) {     // Received a READ COUNTER -- 
+                               uint8_t data[] =  {0x00,0x00,0x00,0x14,0xa5};
+                               EmSendCmdEx(data,sizeof(data),false);                           
+                               p_response = NULL;
+               } else if(receivedCmd[0] == 0xA5 && tagType == 7) {     // Received a INC COUNTER -- 
+                       // number of counter
+                       //uint8_t counter = receivedCmd[1];
+                       //uint32_t val = bytes_to_num(receivedCmd+2,4);
+                       
+                       // send ACK
+                       uint8_t ack[] = {0x0a};
+                       EmSendCmdEx(ack,sizeof(ack),false);
                        p_response = NULL;
+                       
+               } else if(receivedCmd[0] == 0x3E && tagType == 7) {     // Received a CHECK_TEARING_EVENT -- 
+                               p_response = &responses[9];                             
                } else if(receivedCmd[0] == 0x50) {     // Received a HALT
 
                        if (tracing) {
@@ -1137,7 +1227,12 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                        }
                        p_response = NULL;
                } else if(receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61) {   // Received an authentication request
-                       p_response = &responses[5]; order = 7;
+                                       
+                       if ( tagType == 7 ) {   // IF NTAG /EV1  0x60 == GET_VERSION, not a authentication request.
+                               p_response = &responses[7];
+                       } else {
+                               p_response = &responses[5]; order = 7;
+                       }
                } else if(receivedCmd[0] == 0xE0) {     // Received a RATS request
                        if (tagType == 1 || tagType == 2) {     // RATS not supported
                                EmSend4bit(CARD_NACK_NA);
@@ -1188,7 +1283,19 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                                        memset(ar_nr_responses, 0x00, len);
                                }
                        }
-               } else {
+               } else if (receivedCmd[0] == 0x1a ) // ULC authentication
+               {
+                       
+               }
+               else if (receivedCmd[0] == 0x1b) // NTAG / EV-1 authentication
+               {
+                       if ( tagType == 7 ) {
+                               p_response =  &responses[8]; // PACK response
+                               uint32_t pwd = bytes_to_num(receivedCmd+1,4);
+                               Dbprintf("Auth attempt: %08x", pwd);    
+                       }
+               }
+               else {
                        // Check for ISO 14443A-4 compliant commands, look at left nibble
                        switch (receivedCmd[0]) {
 
@@ -1292,10 +1399,12 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
        }
 
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       
-       Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
-       LED_A_OFF();
        BigBuf_free_keep_EM();
+       LED_A_OFF();
+       
+       Dbprintf("-[ Wake ups after halt [%d]", happened);
+       Dbprintf("-[ Messages after halt [%d]", happened2);
+       Dbprintf("-[ Num of received cmd [%d]", cmdsRecvd);
 }
 
 
@@ -1576,9 +1685,7 @@ static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNe
                        FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                }
        
-               if(BUTTON_PRESS()) {
-                       break;
-               }
+               if(BUTTON_PRESS()) break;
        }
 
        // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
@@ -2068,11 +2175,13 @@ void ReaderIso14443a(UsbCommand *c)
 // Therefore try in alternating directions.
 int32_t dist_nt(uint32_t nt1, uint32_t nt2) {
 
+       uint16_t i;
+       uint32_t nttmp1, nttmp2;
+
        if (nt1 == nt2) return 0;
 
-       uint16_t i;
-       uint32_t nttmp1 = nt1;
-       uint32_t nttmp2 = nt2;
+       nttmp1 = nt1;
+       nttmp2 = nt2;
        
        for (i = 1; i < 32768; i++) {
                nttmp1 = prng_successor(nttmp1, 1);
@@ -2091,27 +2200,32 @@ int32_t dist_nt(uint32_t nt1, uint32_t nt2) {
 // Cloning MiFare Classic Rail and Building Passes, Anywhere, Anytime"
 // (article by Nicolas T. Courtois, 2009)
 //-----------------------------------------------------------------------------
-void ReaderMifare(bool first_try) {
+void ReaderMifare(bool first_try)
+{
+       // Mifare AUTH
+       uint8_t mf_auth[]    = { 0x60,0x00,0xf5,0x7b };
+       uint8_t mf_nr_ar[]   = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
+       static uint8_t mf_nr_ar3;
+
+       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];
+       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];
+
+       if (first_try) { 
+               iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
+       }
+       
        // free eventually allocated BigBuf memory. We want all for tracing.
        BigBuf_free();
        
        clear_trace();
        set_tracing(TRUE);
 
-       // Mifare AUTH
-       uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b };
-       uint8_t mf_nr_ar[8] = { 0x00 }; //{ 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01 };
-       static uint8_t mf_nr_ar3 = 0;
-
-       uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE] = { 0x00 };
-       uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE] = { 0x00 };
-
        byte_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;
        bool led_on = TRUE;
-       uint8_t uid[10] = {0x00};
-       //uint32_t cuid = 0x00;
+       uint8_t uid[10]  ={0};
+       uint32_t cuid;
 
        uint32_t nt = 0;
        uint32_t previous_nt = 0;
@@ -2126,11 +2240,8 @@ void ReaderMifare(bool first_try) {
        uint16_t consecutive_resyncs = 0;
        int isOK = 0;
 
-       int numWrongDistance = 0;
-       
        if (first_try) { 
                mf_nr_ar3 = 0;
-               iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
                sync_time = GetCountSspClk() & 0xfffffff8;
                sync_cycles = 65536;                                                                    // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces).
                nt_attacked = 0;
@@ -2147,22 +2258,23 @@ void ReaderMifare(bool first_try) {
        LED_A_ON();
        LED_B_OFF();
        LED_C_OFF();
-       LED_C_ON();     
+       
+
+       #define DARKSIDE_MAX_TRIES      32              // number of tries to sync on PRNG cycle. Then give up.
+       uint16_t unsuccessfull_tries = 0;
   
        for(uint16_t i = 0; TRUE; i++) {
                
+               LED_C_ON();
                WDT_HIT();
 
                // Test if the action was cancelled
-               if(BUTTON_PRESS()) break;
-               
-               if (numWrongDistance > 1000) {
-                       isOK = 0;
+               if(BUTTON_PRESS()) {
+                       isOK = -1;
                        break;
                }
                
-               //if(!iso14443a_select_card(uid, NULL, &cuid)) {
-               if(!iso14443a_select_card(uid, NULL, NULL)) {
+               if(!iso14443a_select_card(uid, NULL, &cuid)) {
                        if (MF_DBGLEVEL >= 1)   Dbprintf("Mifare: Can't select card");
                        continue;
                }
@@ -2196,14 +2308,15 @@ void ReaderMifare(bool first_try) {
                                nt_attacked = nt;
                        }
                        else {
-                               
-                               // invalid nonce received, try again
-                               if (nt_distance == -99999) { 
-                                       numWrongDistance++;
-                                       if (MF_DBGLEVEL >= 3) Dbprintf("The two nonces has invalid distance, tag could have good PRNG\n");
-                                       continue;
+                               if (nt_distance == -99999) { // invalid nonce received
+                                       unsuccessfull_tries++;
+                                       if (!nt_attacked && unsuccessfull_tries > DARKSIDE_MAX_TRIES) {
+                                               isOK = -3;              // Card has an unpredictable PRNG. Give up      
+                                               break;
+                                       } else {
+                                               continue;               // continue trying...
+                                       }
                                }
-                               
                                sync_cycles = (sync_cycles - nt_distance);
                                if (MF_DBGLEVEL >= 3) Dbprintf("calibrating in cycle %d. nt_distance=%d, Sync_cycles: %d\n", i, nt_distance, sync_cycles);
                                continue;
@@ -2212,7 +2325,7 @@ void ReaderMifare(bool first_try) {
 
                if ((nt != nt_attacked) && nt_attacked) {       // we somehow lost sync. Try to catch up again...
                        catch_up_cycles = -dist_nt(nt_attacked, nt);
-                       if (catch_up_cycles >= 99999) {                 // invalid nonce received. Don't resync on that one.
+                       if (catch_up_cycles == 99999) {                 // invalid nonce received. Don't resync on that one.
                                catch_up_cycles = 0;
                                continue;
                        }
@@ -2264,12 +2377,17 @@ void ReaderMifare(bool first_try) {
                        if (nt_diff == 0 && first_try)
                        {
                                par[0]++;
+                               if (par[0] == 0x00) {           // tried all 256 possible parities without success. Card doesn't send NACK.
+                                       isOK = -2;
+                                       break;
+                               }
                        } else {
                                par[0] = ((par[0] & 0x1F) + 1) | par_low;
                        }
                }
        }
 
+
        mf_nr_ar[3] &= 0x1F;
        
        byte_t buf[28] = {0x00};
@@ -2282,9 +2400,11 @@ void ReaderMifare(bool first_try) {
                
        cmd_send(CMD_ACK,isOK,0,0,buf,28);
 
-       set_tracing(FALSE);
+       // Thats it...
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        LEDsoff();
+
+       set_tracing(FALSE);
 }
 
 
@@ -2332,7 +2452,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
        uint8_t rSAK[] = {0x09, 0x3f, 0xcc };  // Mifare Mini 
        uint8_t rSAK1[] = {0x04, 0xda, 0x17};
 
-       uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04};
+       uint8_t rAUTH_NT[] = {0x01, 0x01, 0x01, 0x01};
        uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
                
        //Here, we collect UID,NT,AR,NR,UID2,NT2,AR2,NR2
@@ -2341,16 +2461,6 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
        uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0,0,0};
        uint8_t ar_nr_collected = 0;
 
-       Dbprintf("FIRE");
-       
-       // free eventually allocated BigBuf memory but keep Emulator Memory
-       BigBuf_free_keep_EM();
-
-       // clear trace
-       clear_trace();
-       set_tracing(TRUE);
-
-       Dbprintf("ICE");
        // Authenticate response - nonce
        uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
        
@@ -2380,7 +2490,6 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                }
        }
 
-       Dbprintf("ICE2");
        // save uid.
        ar_nr_responses[0*5]   = bytes_to_num(rUIDBCC1+1, 3);
        if ( _7BUID )
@@ -2398,10 +2507,6 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
        }
 
-       // We need to listen to the high-frequency, peak-detected path.
-       iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
-
-
        if (MF_DBGLEVEL >= 1)   {
                if (!_7BUID) {
                        Dbprintf("4B UID: %02x%02x%02x%02x", 
@@ -2413,7 +2518,17 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                }
        }
 
-       Dbprintf("ICE3");
+       // We need to listen to the high-frequency, peak-detected path.
+       iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+
+       // free eventually allocated BigBuf memory but keep Emulator Memory
+       BigBuf_free_keep_EM();
+
+       // clear trace
+       clear_trace();
+       set_tracing(TRUE);
+
+
        bool finished = FALSE;
        while (!BUTTON_PRESS() && !finished) {
                WDT_HIT();
@@ -2825,9 +2940,6 @@ void RAMFUNC SniffMifare(uint8_t param) {
        // bit 0 - trigger from first card answer
        // bit 1 - trigger from first reader 7-bit request
 
-       // free eventually allocated BigBuf memory
-       BigBuf_free();
-       
        // C(red) A(yellow) B(green)
        LEDsoff();
        // init trace buffer
@@ -2843,6 +2955,10 @@ void RAMFUNC SniffMifare(uint8_t param) {
        uint8_t receivedResponse[MAX_MIFARE_FRAME_SIZE];
        uint8_t receivedResponsePar[MAX_MIFARE_PARITY_SIZE];
 
+       iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
+
+       // free eventually allocated BigBuf memory
+       BigBuf_free();
        // allocate the DMA buffer, used to stream samples from the FPGA
        uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
        uint8_t *data = dmaBuf;
@@ -2852,8 +2968,6 @@ void RAMFUNC SniffMifare(uint8_t param) {
        bool ReaderIsActive = FALSE;
        bool TagIsActive = FALSE;
 
-       iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
-
        // Set up the demodulator for tag -> reader responses.
        DemodInit(receivedResponse, receivedResponsePar);
 
@@ -2933,7 +3047,7 @@ void RAMFUNC SniffMifare(uint8_t param) {
                                        if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, TRUE)) break;
 
                                        /* And ready to receive another command. */
-                                       UartInit(receivedCmd, receivedCmdPar);
+                                       UartReset();
                                        
                                        /* And also reset the demod code */
                                        DemodReset();
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