]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/iso14443a.c
added better tracing capabilities, fixed some reader issues
[proxmark3-svn] / armsrc / iso14443a.c
index fb50cc825b00c7ad4b8165fe19b03936ebe5aef9..7eca7977a5d6dba114fe95eb24c194f6208e3321 100644 (file)
 #include "crapto1.h"
 #include "mifareutil.h"
 
-static uint8_t *trace = (uint8_t *) BigBuf;
-static int traceLen = 0;
-static int rsamples = 0;
-static int tracing = TRUE;
 static uint32_t iso14a_timeout;
+uint8_t *trace = (uint8_t *) BigBuf;
+int traceLen = 0;
+int rsamples = 0;
+int tracing = TRUE;
+uint8_t trigger = 0;
 
-// CARD TO READER
+// CARD TO READER - manchester
 // Sequence D: 11110000 modulation with subcarrier during first half
 // Sequence E: 00001111 modulation with subcarrier during second half
 // Sequence F: 00000000 no modulation with subcarrier
-// READER TO CARD
+// READER TO CARD - miller
 // Sequence X: 00001100 drop after half a period
 // Sequence Y: 00000000 no drop
 // Sequence Z: 11000000 drop at start
@@ -41,7 +42,7 @@ static uint32_t iso14a_timeout;
 #define        SEC_Y 0x00
 #define        SEC_Z 0xc0
 
-static const uint8_t OddByteParity[256] = {
+const uint8_t OddByteParity[256] = {
   1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
   0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
   0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
@@ -60,18 +61,18 @@ static const uint8_t OddByteParity[256] = {
   1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1
 };
 
-// BIG CHANGE - UNDERSTAND THIS BEFORE WE COMMIT
-#define RECV_CMD_OFFSET   3032
-#define RECV_RES_OFFSET   3096
-#define DMA_BUFFER_OFFSET 3160
-#define DMA_BUFFER_SIZE   4096
-#define TRACE_LENGTH      3000
 
-uint8_t trigger = 0;
 void iso14a_set_trigger(int enable) {
        trigger = enable;
 }
 
+void iso14a_clear_tracelen(void) {
+       traceLen = 0;
+}
+void iso14a_set_tracing(int enable) {
+       tracing = enable;
+}
+
 //-----------------------------------------------------------------------------
 // Generate the parity value for a byte sequence
 //
@@ -99,10 +100,11 @@ void AppendCrc14443a(uint8_t* data, int len)
   ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1);
 }
 
+// The function LogTrace() is also used by the iClass implementation in iClass.c
 int LogTrace(const uint8_t * btBytes, int iLen, int iSamples, uint32_t dwParity, int bReader)
 {
   // Return when trace is full
-  if (traceLen >= TRACE_LENGTH) return FALSE;
+  if (traceLen >= TRACE_SIZE) return FALSE;
 
   // Trace the random, i'm curious
   rsamples += iSamples;
@@ -156,7 +158,7 @@ static struct {
 
 static RAMFUNC int MillerDecoding(int bit)
 {
-       int error = 0;
+       //int error = 0;
        int bitright;
 
        if(!Uart.bitBuffer) {
@@ -202,7 +204,7 @@ static RAMFUNC int MillerDecoding(int bit)
                                // measured a drop in first and second half
                                // which should not be possible
                                Uart.state = STATE_ERROR_WAIT;
-                               error = 0x01;
+                               //error = 0x01;
                        }
 
                        Uart.posCnt = 0;
@@ -213,7 +215,7 @@ static RAMFUNC int MillerDecoding(int bit)
                                        if(Uart.drop == DROP_SECOND_HALF) {
                                                // error, should not happen in SOC
                                                Uart.state = STATE_ERROR_WAIT;
-                                               error = 0x02;
+                                               //error = 0x02;
                                        }
                                        else {
                                                // correct SOC
@@ -251,7 +253,7 @@ static RAMFUNC int MillerDecoding(int bit)
                                                // Would be STATE_MILLER_Z
                                                // but Z does not follow X, so error
                                                Uart.state = STATE_ERROR_WAIT;
-                                               error = 0x03;
+                                               //error = 0x03;
                                        }
                                        if(Uart.drop == DROP_SECOND_HALF) {
                                                // We see a '1' and stay in state X
@@ -372,7 +374,7 @@ static RAMFUNC int MillerDecoding(int bit)
                                Uart.bitCnt = 0;
                                Uart.byteCnt = 0;
                                Uart.parityBits = 0;
-                               error = 0;
+                               //error = 0;
                        }
                        else {
                                Uart.highCnt = 0;
@@ -422,7 +424,7 @@ static RAMFUNC int ManchesterDecoding(int v)
 {
        int bit;
        int modulation;
-       int error = 0;
+       //int error = 0;
 
        if(!Demod.buff) {
                Demod.buff = 1;
@@ -479,7 +481,7 @@ static RAMFUNC int ManchesterDecoding(int v)
                                        case 0x01: Demod.samples = 0; break;
                                }
                        }
-                       error = 0;
+                       //error = 0;
                }
        }
        else {
@@ -503,7 +505,7 @@ static RAMFUNC int ManchesterDecoding(int v)
                                if(Demod.state!=DEMOD_ERROR_WAIT) {
                                        Demod.state = DEMOD_ERROR_WAIT;
                                        Demod.output[Demod.len] = 0xaa;
-                                       error = 0x01;
+                                       //error = 0x01;
                                }
                        }
                        else if(modulation) {
@@ -518,7 +520,7 @@ static RAMFUNC int ManchesterDecoding(int v)
                                        else {
                                                Demod.output[Demod.len] = 0xab;
                                                Demod.state = DEMOD_ERROR_WAIT;
-                                               error = 0x02;
+                                               //error = 0x02;
                                        }
                                        break;
 
@@ -556,7 +558,7 @@ static RAMFUNC int ManchesterDecoding(int v)
                                        else {
                                                Demod.output[Demod.len] = 0xad;
                                                Demod.state = DEMOD_ERROR_WAIT;
-                                               error = 0x03;
+                                               //error = 0x03;
                                        }
                                        break;
 
@@ -622,7 +624,7 @@ void RAMFUNC SnoopIso14443a(void)
 //     #define RECV_RES_OFFSET         2096    // original (working as of 21/2/09) values
 //     #define DMA_BUFFER_OFFSET       2160    // original (working as of 21/2/09) values
 //     #define DMA_BUFFER_SIZE         4096    // original (working as of 21/2/09) values
-//     #define TRACE_LENGTH            2000    // original (working as of 21/2/09) values
+//     #define TRACE_SIZE              2000    // original (working as of 21/2/09) values
 
     // 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
@@ -654,7 +656,7 @@ void RAMFUNC SnoopIso14443a(void)
     int samples = 0;
     int rsamples = 0;
 
-    memset(trace, 0x44, RECV_CMD_OFFSET);
+    memset(trace, 0x44, TRACE_SIZE);
 
     // Set up the demodulator for tag -> reader responses.
     Demod.output = receivedResponse;
@@ -722,7 +724,7 @@ void RAMFUNC SnoopIso14443a(void)
                 trace[traceLen++] = Uart.byteCnt;
                 memcpy(trace+traceLen, receivedCmd, Uart.byteCnt);
                 traceLen += Uart.byteCnt;
-                if(traceLen > TRACE_LENGTH) break;
+                if(traceLen > TRACE_SIZE) break;
             }
             /* And ready to receive another command. */
             Uart.state = STATE_UNSYNCD;
@@ -749,7 +751,7 @@ void RAMFUNC SnoopIso14443a(void)
             trace[traceLen++] = Demod.len;
             memcpy(trace+traceLen, receivedResponse, Demod.len);
             traceLen += Demod.len;
-            if(traceLen > TRACE_LENGTH) break;
+            if(traceLen > TRACE_SIZE) break;
 
             triggered = TRUE;
 
@@ -768,13 +770,10 @@ void RAMFUNC SnoopIso14443a(void)
 
     DbpString("COMMAND FINISHED");
 
-    Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
-    Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
-
 done:
     AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
-    Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
-    Dbprintf("%x %x %x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
+    Dbprintf("maxBehindBy=%x, Uart.state=%x, Uart.byteCnt=%x", maxBehindBy, Uart.state, Uart.byteCnt);
+    Dbprintf("Uart.byteCntMax=%x, traceLen=%x, Uart.output[0]=%x", Uart.byteCntMax, traceLen, (int)Uart.output[0]);
     LED_A_OFF();
     LED_B_OFF();
        LED_C_OFF();
@@ -784,12 +783,11 @@ done:
 //-----------------------------------------------------------------------------
 // Prepare tag messages
 //-----------------------------------------------------------------------------
-static void CodeIso14443aAsTag(const uint8_t *cmd, int len)
+static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity)
 {
-    int i;
-       int oddparity;
+       int i;
 
-    ToSendReset();
+       ToSendReset();
 
        // Correction bit, might be removed when not needed
        ToSendStuffBit(0);
@@ -800,55 +798,47 @@ static void CodeIso14443aAsTag(const uint8_t *cmd, int len)
        ToSendStuffBit(0);
        ToSendStuffBit(0);
        ToSendStuffBit(0);
-
+       
        // Send startbit
        ToSend[++ToSendMax] = SEC_D;
 
-    for(i = 0; i < len; i++) {
-        int j;
-        uint8_t b = cmd[i];
+       for(i = 0; i < len; i++) {
+               int j;
+               uint8_t b = cmd[i];
 
                // Data bits
-        oddparity = 0x01;
                for(j = 0; j < 8; j++) {
-            oddparity ^= (b & 1);
                        if(b & 1) {
                                ToSend[++ToSendMax] = SEC_D;
                        } else {
                                ToSend[++ToSendMax] = SEC_E;
-            }
-            b >>= 1;
-        }
+                       }
+                       b >>= 1;
+               }
 
-        // Parity bit
-        if(oddparity) {
-               ToSend[++ToSendMax] = SEC_D;
+               // Get the parity bit
+               if ((dwParity >> i) & 0x01) {
+                       ToSend[++ToSendMax] = SEC_D;
                } else {
                        ToSend[++ToSendMax] = SEC_E;
                }
-    }
-
-    // Send stopbit
-    ToSend[++ToSendMax] = SEC_F;
-
-       // Flush the buffer in FPGA!!
-       for(i = 0; i < 5; i++) {
-               ToSend[++ToSendMax] = SEC_F;
        }
 
-    // Convert from last byte pos to length
-    ToSendMax++;
+       // Send stopbit
+       ToSend[++ToSendMax] = SEC_F;
+
+       // Convert from last byte pos to length
+       ToSendMax++;
+}
 
-    // Add a few more for slop
-    ToSend[ToSendMax++] = 0x00;
-       ToSend[ToSendMax++] = 0x00;
-    //ToSendMax += 2;
+static void CodeIso14443aAsTag(const uint8_t *cmd, int len){
+       CodeIso14443aAsTagPar(cmd, len, GetParity(cmd, len));
 }
 
 //-----------------------------------------------------------------------------
 // This is to send a NACK kind of answer, its only 3 bits, I know it should be 4
 //-----------------------------------------------------------------------------
-static void CodeStrangeAnswer()
+static void CodeStrangeAnswerAsTag()
 {
        int i;
 
@@ -886,11 +876,47 @@ static void CodeStrangeAnswer()
 
     // Convert from last byte pos to length
     ToSendMax++;
+}
+
+static void Code4bitAnswerAsTag(uint8_t cmd)
+{
+       int i;
 
-    // Add a few more for slop
-    ToSend[ToSendMax++] = 0x00;
-       ToSend[ToSendMax++] = 0x00;
-    //ToSendMax += 2;
+    ToSendReset();
+
+       // Correction bit, might be removed when not needed
+       ToSendStuffBit(0);
+       ToSendStuffBit(0);
+       ToSendStuffBit(0);
+       ToSendStuffBit(0);
+       ToSendStuffBit(1);  // 1
+       ToSendStuffBit(0);
+       ToSendStuffBit(0);
+       ToSendStuffBit(0);
+
+       // Send startbit
+       ToSend[++ToSendMax] = SEC_D;
+
+       uint8_t b = cmd;
+       for(i = 0; i < 4; i++) {
+               if(b & 1) {
+                       ToSend[++ToSendMax] = SEC_D;
+               } else {
+                       ToSend[++ToSendMax] = SEC_E;
+               }
+               b >>= 1;
+       }
+
+       // Send stopbit
+       ToSend[++ToSendMax] = SEC_F;
+
+       // Flush the buffer in FPGA!!
+       for(i = 0; i < 5; i++) {
+               ToSend[++ToSendMax] = SEC_F;
+       }
+
+    // Convert from last byte pos to length
+    ToSendMax++;
 }
 
 //-----------------------------------------------------------------------------
@@ -938,15 +964,102 @@ static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded);
 // Main loop of simulated tag: receive commands from reader, decide what
 // response to send, and send it.
 //-----------------------------------------------------------------------------
-void SimulateIso14443aTag(int tagType, int TagUid)
+void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd)
 {
+  // Enable and clear the trace
+       tracing = TRUE;
+       traceLen = 0;
+  memset(trace, 0x44, TRACE_SIZE);
+
        // This function contains the tag emulation
+       uint8_t sak;
+
+       // The first response contains the ATQA (note: bytes are transmitted in reverse order).
+       uint8_t response1[2];
+       
+       switch (tagType) {
+               case 1: { // MIFARE Classic
+                       // Says: I am Mifare 1k - original line
+                       response1[0] = 0x04;
+                       response1[1] = 0x00;
+                       sak = 0x08;
+               } break;
+               case 2: { // MIFARE Ultralight
+                       // Says: I am a stupid memory tag, no crypto
+                       response1[0] = 0x04;
+                       response1[1] = 0x00;
+                       sak = 0x00;
+               } break;
+               case 3: { // MIFARE DESFire
+                       // Says: I am a DESFire tag, ph33r me
+                       response1[0] = 0x04;
+                       response1[1] = 0x03;
+                       sak = 0x20;
+               } break;
+               case 4: { // ISO/IEC 14443-4
+                       // Says: I am a javacard (JCOP)
+                       response1[0] = 0x04;
+                       response1[1] = 0x00;
+                       sak = 0x28;
+               } break;
+               default: {
+                       Dbprintf("Error: unkown tagtype (%d)",tagType);
+                       return;
+               } break;
+       }
+       
+       // The second response contains the (mandatory) first 24 bits of the UID
+       uint8_t response2[5];
+
+       // Check if the uid uses the (optional) part
+       uint8_t response2a[5];
+       if (uid_2nd) {
+               response2[0] = 0x88;
+               num_to_bytes(uid_1st,3,response2+1);
+               num_to_bytes(uid_2nd,4,response2a);
+               response2a[4] = response2a[0] ^ response2a[1] ^ response2a[2] ^ response2a[3];
+
+               // Configure the ATQA and SAK accordingly
+               response1[0] |= 0x40;
+               sak |= 0x04;
+       } else {
+               num_to_bytes(uid_1st,4,response2);
+               // Configure the ATQA and SAK accordingly
+               response1[0] &= 0xBF;
+               sak &= 0xFB;
+       }
+
+       // Calculate the BitCountCheck (BCC) for the first 4 bytes of the UID.
+       response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3];
+
+       // Prepare the mandatory SAK (for 4 and 7 byte UID)
+       uint8_t response3[3];
+       response3[0] = sak;
+       ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]);
+
+       // Prepare the optional second SAK (for 7 byte UID), drop the cascade bit
+       uint8_t response3a[3];
+       response3a[0] = sak & 0xFB;
+       ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
+
+
+/*
+       // Check if the uid uses the (optional) second part
+       if (uid_2nd) {
+               // Configure the ATQA and SAK accordingly
+               response1[0] |= 0x40;
+               sak |= 0x04;
+       }
+*/
+
+//static const uint8_t response2a[] = { 0x51, 0x48, 0x1d, 0x80, 0x84 }; //  uid - cascade2 - 2nd half (4 bytes) of UID+ BCCheck
+
 
        // Prepare protocol messages
     // static const uint8_t cmd1[] = { 0x26 };
 //     static const uint8_t response1[] = { 0x02, 0x00 }; // Says: I am Mifare 4k - original line - greg
 //
-       static const uint8_t response1[] = { 0x44, 0x03 }; // Says: I am a DESFire Tag, ph33r me
+//     uint8_t response1[] = { 0x44, 0x03 }; // Says: I am a DESFire Tag, ph33r me
 //     static const uint8_t response1[] = { 0x44, 0x00 }; // Says: I am a ULTRALITE Tag, 0wn me
 
        // UID response
@@ -954,29 +1067,29 @@ void SimulateIso14443aTag(int tagType, int TagUid)
     //static const uint8_t response2[] = { 0x9a, 0xe5, 0xe4, 0x43, 0xd8 }; // original value - greg
 
 // my desfire
-    static const uint8_t response2[] = { 0x88, 0x04, 0x21, 0x3f, 0x4d }; // known uid - note cascade (0x88), 2nd byte (0x04) = NXP/Phillips
+//     uint8_t response2[] = { 0x88, 0x04, 0x21, 0x3f, 0x4d }; // known uid - note cascade (0x88), 2nd byte (0x04) = NXP/Phillips
 
 
 // When reader selects us during cascade1 it will send cmd3
 //uint8_t response3[] = { 0x04, 0x00, 0x00 }; // SAK Select (cascade1) successful response (ULTRALITE)
-uint8_t response3[] = { 0x24, 0x00, 0x00 }; // SAK Select (cascade1) successful response (DESFire)
-ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]);
+//uint8_t response3[] = { 0x24, 0x00, 0x00 }; // SAK Select (cascade1) successful response (DESFire)
+//ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]);
 
 // send cascade2 2nd half of UID
-static const uint8_t response2a[] = { 0x51, 0x48, 0x1d, 0x80, 0x84 }; //  uid - cascade2 - 2nd half (4 bytes) of UID+ BCCheck
+//static const uint8_t response2a[] = { 0x51, 0x48, 0x1d, 0x80, 0x84 }; //  uid - cascade2 - 2nd half (4 bytes) of UID+ BCCheck
 // NOTE : THE CRC on the above may be wrong as I have obfuscated the actual UID
 
 // When reader selects us during cascade2 it will send cmd3a
 //uint8_t response3a[] = { 0x00, 0x00, 0x00 }; // SAK Select (cascade2) successful response (ULTRALITE)
-uint8_t response3a[] = { 0x20, 0x00, 0x00 }; // SAK Select (cascade2) successful response (DESFire)
-ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
+//uint8_t response3a[] = { 0x20, 0x00, 0x00 }; // SAK Select (cascade2) successful response (DESFire)
+//ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
 
     static const uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce
 
     uint8_t *resp;
     int respLen;
 
-    // Longest possible response will be 16 bytes + 2 CRC = 18 bytes
+  // Longest possible response will be 16 bytes + 2 CRC = 18 bytes
        // This will need
        //    144        data bits (18 * 8)
        //     18        parity bits
@@ -990,11 +1103,11 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
        //
 
     // Respond with card type
-    uint8_t *resp1 = (((uint8_t *)BigBuf) + 800);
+    uint8_t *resp1 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
     int resp1Len;
 
     // Anticollision cascade1 - respond with uid
-    uint8_t *resp2 = (((uint8_t *)BigBuf) + 970);
+    uint8_t *resp2 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + 166);
     int resp2Len;
 
     // Anticollision cascade2 - respond with 2nd half of uid if asked
@@ -1003,27 +1116,28 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
     int resp2aLen;
 
     // Acknowledge select - cascade 1
-    uint8_t *resp3 = (((uint8_t *)BigBuf) + 1310);
+    uint8_t *resp3 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*2));
     int resp3Len;
 
     // Acknowledge select - cascade 2
-    uint8_t *resp3a = (((uint8_t *)BigBuf) + 1480);
+    uint8_t *resp3a = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*3));
     int resp3aLen;
 
     // Response to a read request - not implemented atm
-    uint8_t *resp4 = (((uint8_t *)BigBuf) + 1550);
+    uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*4));
     int resp4Len;
 
     // Authenticate response - nonce
-    uint8_t *resp5 = (((uint8_t *)BigBuf) + 1720);
+    uint8_t *resp5 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*5));
     int resp5Len;
 
-    uint8_t *receivedCmd = (uint8_t *)BigBuf;
+    uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
+//             uint8_t *receivedCmd = (uint8_t *)BigBuf;
     int len;
 
-    int i;
-       int u;
-       uint8_t b;
+    //int i;
+       //int u;
+       //uint8_t b;
 
        // To control where we are in the protocol
        int order = 0;
@@ -1033,11 +1147,14 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
        int happened = 0;
        int happened2 = 0;
 
-    int cmdsRecvd = 0;
+       int cmdsRecvd = 0;
+       uint8_t* respdata = NULL;
+       int respsize = 0;
+       uint8_t nack = 0x04;
 
-       int fdt_indicator;
+       //int fdt_indicator;
 
-    memset(receivedCmd, 0x44, 400);
+       memset(receivedCmd, 0x44, RECV_CMD_SIZE);
 
        // Prepare the responses of the anticollision phase
        // there will be not enough time to do this at the moment the reader sends it REQA
@@ -1063,7 +1180,7 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
     memcpy(resp3a, ToSend, ToSendMax); resp3aLen = ToSendMax;
 
        // Strange answer is an example of rare message size (3 bits)
-       CodeStrangeAnswer();
+       CodeStrangeAnswerAsTag();
        memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
 
        // Authentication answer (random nonce)
@@ -1079,84 +1196,99 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
     LED_A_ON();
        for(;;) {
 
-               if(!GetIso14443aCommandFromReader(receivedCmd, &len, 100)) {
+               if(!GetIso14443aCommandFromReader(receivedCmd, &len, RECV_CMD_SIZE)) {
             DbpString("button press");
             break;
         }
        // doob - added loads of debug strings so we can see what the reader is saying to us during the sim as hi14alist is not populated
         // Okay, look at the command now.
         lastorder = order;
-               i = 1; // first byte transmitted
+               //i = 1; // first byte transmitted
         if(receivedCmd[0] == 0x26) {
                        // Received a REQUEST
                        resp = resp1; respLen = resp1Len; order = 1;
+                       respdata = response1;
+                       respsize = sizeof(response1);
                        //DbpString("Hello request from reader:");
                } else if(receivedCmd[0] == 0x52) {
                        // Received a WAKEUP
                        resp = resp1; respLen = resp1Len; order = 6;
 //                     //DbpString("Wakeup request from reader:");
-
+                       respdata = response1;
+                       respsize = sizeof(response1);
                } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) {   // greg - cascade 1 anti-collision
                        // Received request for UID (cascade 1)
                        resp = resp2; respLen = resp2Len; order = 2;
 //                     DbpString("UID (cascade 1) request from reader:");
 //                     DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
-
+                       respdata = response2;
+                       respsize = sizeof(response2);
                } else if(receivedCmd[1] == 0x20 && receivedCmd[0] ==0x95) {    // greg - cascade 2 anti-collision
                        // Received request for UID (cascade 2)
                        resp = resp2a; respLen = resp2aLen; order = 20;
 //                     DbpString("UID (cascade 2) request from reader:");
 //                     DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
+                       respdata = response2a;
+                       respsize = sizeof(response2a);
 
                } else if(receivedCmd[1] == 0x70 && receivedCmd[0] ==0x93) {    // greg - cascade 1 select
                        // Received a SELECT
                        resp = resp3; respLen = resp3Len; order = 3;
 //                     DbpString("Select (cascade 1) request from reader:");
 //                     DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
+                       respdata = response3;
+                       respsize = sizeof(response3);
 
                } else if(receivedCmd[1] == 0x70 && receivedCmd[0] ==0x95) {    // greg - cascade 2 select
                        // Received a SELECT
                        resp = resp3a; respLen = resp3aLen; order = 30;
 //                     DbpString("Select (cascade 2) request from reader:");
 //                     DbpIntegers(receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
+                       respdata = response3a;
+                       respsize = sizeof(response3a);
 
                } else if(receivedCmd[0] == 0x30) {
                        // Received a READ
                        resp = resp4; respLen = resp4Len; order = 4; // Do nothing
                        Dbprintf("Read request from reader: %x %x %x",
                                receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-
+                       respdata = &nack;
+                       respsize = sizeof(nack); // 4-bit answer
 
                } else if(receivedCmd[0] == 0x50) {
                        // Received a HALT
                        resp = resp1; respLen = 0; order = 5; // Do nothing
                        DbpString("Reader requested we HALT!:");
+                       respdata = NULL;
+                       respsize = 0;
 
                } else if(receivedCmd[0] == 0x60) {
                        // Received an authentication request
                        resp = resp5; respLen = resp5Len; order = 7;
                        Dbprintf("Authenticate request from reader: %x %x %x",
                                receivedCmd[0], receivedCmd[1], receivedCmd[2]);
+                       respdata = NULL;
+                       respsize = 0;
 
                } else if(receivedCmd[0] == 0xE0) {
                        // Received a RATS request
                        resp = resp1; respLen = 0;order = 70;
                        Dbprintf("RATS request from reader: %x %x %x",
                                receivedCmd[0], receivedCmd[1], receivedCmd[2]);
-        } else {
-            // Never seen this command before
-               Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
+                       respdata = NULL;
+                       respsize = 0;
+               } else {
+                       // Never seen this command before
+                       Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
                        len,
                        receivedCmd[0], receivedCmd[1], receivedCmd[2],
                        receivedCmd[3], receivedCmd[4], receivedCmd[5],
                        receivedCmd[6], receivedCmd[7], receivedCmd[8]);
                        // Do not respond
                        resp = resp1; respLen = 0; order = 0;
-        }
+                       respdata = NULL;
+                       respsize = 0;
+               }
 
                // Count number of wakeups received after a halt
                if(order == 6 && lastorder == 5) { happened++; }
@@ -1167,10 +1299,9 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
                // Look at last parity bit to determine timing of answer
                if((Uart.parityBits & 0x01) || receivedCmd[0] == 0x52) {
                        // 1236, so correction bit needed
-                       i = 0;
+                       //i = 0;
                }
 
-        memset(receivedCmd, 0x44, 32);
 
                if(cmdsRecvd > 999) {
                        DbpString("1000 commands later...");
@@ -1180,13 +1311,26 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
                        cmdsRecvd++;
                }
 
-        if(respLen <= 0) continue;
-               //----------------------------
-               u = 0;
-               b = 0x00;
-               fdt_indicator = FALSE;
+               if(respLen > 0) {
+                       //----------------------------
+                       //u = 0;
+                       //b = 0x00;
+                       //fdt_indicator = FALSE;
+                       EmSendCmd14443aRaw(resp, respLen, receivedCmd[0] == 0x52);
+               }
+               
+               if (tracing) {
+                       LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE);
+                       if (respdata != NULL) {
+                               LogTrace(respdata,respsize, 0, SwapBits(GetParity(respdata,respsize),respsize), FALSE);
+                       }
+                       if(traceLen > TRACE_SIZE) {
+                               DbpString("Trace full");
+                               break;
+                       }
+               }
 
-               EmSendCmd14443aRaw(resp, respLen, receivedCmd[0] == 0x52);
+               memset(receivedCmd, 0x44, RECV_CMD_SIZE);
 /*        // Modulate Manchester
                FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
         AT91C_BASE_SSC->SSC_THR = 0x00;
@@ -1469,10 +1613,12 @@ static int EmGetCmd(uint8_t *received, int *len, int maxLen)
                        volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        if(MillerDecoding((b & 0xf0) >> 4)) {
                                *len = Uart.byteCnt;
+                               if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE);
                                return 0;
                        }
                        if(MillerDecoding(b & 0x0f)) {
                                *len = Uart.byteCnt;
+                               if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE);
                                return 0;
                        }
                }
@@ -1504,7 +1650,7 @@ static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded)
                }
                if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
                        if(i > respLen) {
-                               b = 0x00;
+                               b = 0xff; // was 0x00
                                u++;
                        } else {
                                b = resp[i];
@@ -1522,13 +1668,34 @@ static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded)
        return 0;
 }
 
-static int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded){
-  CodeIso14443aAsTag(resp, respLen);
-       return EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
+int EmSend4bitEx(uint8_t resp, int correctionNeeded){
+  Code4bitAnswerAsTag(resp);
+       int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
+  if (tracing) LogTrace(&resp, 1, GetDeltaCountUS(), GetParity(&resp, 1), FALSE);
+       return res;
+}
+
+int EmSend4bit(uint8_t resp){
+       return EmSend4bitEx(resp, 0);
 }
 
-static int EmSendCmd(uint8_t *resp, int respLen){
-       return EmSendCmdEx(resp, respLen, 0);
+int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par){
+  CodeIso14443aAsTagPar(resp, respLen, par);
+       int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
+  if (tracing) LogTrace(resp, respLen, GetDeltaCountUS(), par, FALSE);
+       return res;
+}
+
+int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded){
+       return EmSendCmdExPar(resp, respLen, correctionNeeded, GetParity(resp, respLen));
+}
+
+int EmSendCmd(uint8_t *resp, int respLen){
+       return EmSendCmdExPar(resp, respLen, 0, GetParity(resp, respLen));
+}
+
+int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par){
+       return EmSendCmdExPar(resp, respLen, 0, par);
 }
 
 //-----------------------------------------------------------------------------
@@ -1823,7 +1990,7 @@ void ReaderMifare(uint32_t parameter)
        byte_t nt_diff = 0;
        LED_A_OFF();
        byte_t par = 0;
-       byte_t par_mask = 0xff;
+       //byte_t par_mask = 0xff;
        byte_t par_low = 0;
        int led_on = TRUE;
        uint8_t uid[8];
@@ -1867,14 +2034,14 @@ void ReaderMifare(uint32_t parameter)
                {
                        if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue;
 
-                       isNULL = (nt_attacked[0] = 0) && (nt_attacked[1] = 0) && (nt_attacked[2] = 0) && (nt_attacked[3] = 0);
+                       isNULL = (nt_attacked[0] == 0) && (nt_attacked[1] == 0) && (nt_attacked[2] == 0) && (nt_attacked[3] == 0);
                        if ( (isNULL != 0 ) && (memcmp(nt, nt_attacked, 4) != 0) ) continue;
 
                        if (nt_diff == 0)
                        {
                                LED_A_ON();
                                memcpy(nt_attacked, nt, 4);
-                               par_mask = 0xf8;
+                               //par_mask = 0xf8;
                                par_low = par & 0x07;
                        }
 
@@ -1924,760 +2091,424 @@ void ReaderMifare(uint32_t parameter)
        if (MF_DBGLEVEL >= 1)   DbpString("COMMAND mifare FINISHED");
 }
 
+
 //-----------------------------------------------------------------------------
-// Select, Authenticaate, Read an MIFARE tag
-// read block
+// MIFARE 1K simulate
+// 
 //-----------------------------------------------------------------------------
-void MifareReadBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
+void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
 {
-  // params
-       uint8_t blockNo = arg0;
-       uint8_t keyType = arg1;
-       uint64_t ui64Key = 0;
-       ui64Key = bytes_to_num(datain, 6);
-       
-       // variables
-       byte_t isOK = 0;
-       byte_t dataoutbuf[16];
-       uint8_t uid[8];
-       uint32_t cuid;
+       int cardSTATE = MFEMUL_NOFIELD;
+       int _7BUID = 0;
+       int vHf = 0;    // in mV
+       //int nextCycleTimeout = 0;
+       int res;
+//     uint32_t timer = 0;
+       uint32_t selTimer = 0;
+       uint32_t authTimer = 0;
+       uint32_t par = 0;
+       int len = 0;
+       uint8_t cardWRBL = 0;
+       uint8_t cardAUTHSC = 0;
+       uint8_t cardAUTHKEY = 0xff;  // no authentication
+       //uint32_t cardRn = 0;
+       uint32_t cardRr = 0;
+       uint32_t cuid = 0;
+       //uint32_t rn_enc = 0;
+       uint32_t ans = 0;
+       uint32_t cardINTREG = 0;
+       uint8_t cardINTBLOCK = 0;
        struct Crypto1State mpcs = {0, 0};
        struct Crypto1State *pcs;
        pcs = &mpcs;
-
-       // clear trace
-       traceLen = 0;
-//     tracing = false;
-
-       iso14443a_setup();
-
-       LED_A_ON();
-       LED_B_OFF();
-       LED_C_OFF();
-
-       while (true) {
-               if(!iso14443a_select_card(uid, NULL, &cuid)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
-                       break;
-               };
-
-               if(mifare_classic_auth(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Auth error");
-                       break;
-               };
-               
-               if(mifare_classic_readblock(pcs, cuid, blockNo, dataoutbuf)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Read block error");
-                       break;
-               };
-
-               if(mifare_classic_halt(pcs, cuid)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Halt error");
-                       break;
-               };
-               
-               isOK = 1;
-               break;
-       }
        
-       //  ----------------------------- crypto1 destroy
-       crypto1_destroy(pcs);
+       uint8_t* receivedCmd = eml_get_bigbufptr_recbuf();
+       uint8_t *response = eml_get_bigbufptr_sendbuf();
        
-       if (MF_DBGLEVEL >= 2)   DbpString("READ BLOCK FINISHED");
-
-       // add trace trailer
-       uid[0] = 0xff;
-       uid[1] = 0xff;
-       uid[2] = 0xff;
-       uid[3] = 0xff;
-       LogTrace(uid, 4, 0, 0, TRUE);
-
-       UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
-       memcpy(ack.d.asBytes, dataoutbuf, 16);
-       
-       LED_B_ON();
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();
+       static uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID
 
+       static uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; 
+       static uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!!
+               
+       static uint8_t rSAK[] = {0x08, 0xb6, 0xdd};
+       static uint8_t rSAK1[] = {0x04, 0xda, 0x17};
 
-  // Thats it...
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       LEDsoff();
-//  tracing = TRUE;
+       static uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04};
+//     static uint8_t rAUTH_NT[] = {0x1a, 0xac, 0xff, 0x4f};
+       static uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
 
-}
+       // clear trace
+       traceLen = 0;
+       tracing = true;
 
-//-----------------------------------------------------------------------------
-// Select, Authenticaate, Read an MIFARE tag. 
-// read sector (data = 4 x 16 bytes = 64 bytes)
-//-----------------------------------------------------------------------------
-void MifareReadSector(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
-{
-  // params
-       uint8_t sectorNo = arg0;
-       uint8_t keyType = arg1;
-       uint64_t ui64Key = 0;
-       ui64Key = bytes_to_num(datain, 6);
+  // Authenticate response - nonce
+       uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
        
-       // variables
-       byte_t isOK = 0;
-       byte_t dataoutbuf[16 * 4];
-       uint8_t uid[8];
-       uint32_t cuid;
-       struct Crypto1State mpcs = {0, 0};
-       struct Crypto1State *pcs;
-       pcs = &mpcs;
+       // get UID from emul memory
+       emlGetMemBt(receivedCmd, 7, 1);
+       _7BUID = !(receivedCmd[0] == 0x00);
+       if (!_7BUID) {                     // ---------- 4BUID
+               rATQA[0] = 0x04;
+
+               emlGetMemBt(rUIDBCC1, 0, 4);
+               rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
+       } else {                           // ---------- 7BUID
+               rATQA[0] = 0x44;
+
+               rUIDBCC1[0] = 0x88;
+               emlGetMemBt(&rUIDBCC1[1], 0, 3);
+               rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
+               emlGetMemBt(rUIDBCC2, 3, 4);
+               rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
+       }
 
-       // clear trace
-       traceLen = 0;
-//     tracing = false;
+// --------------------------------------      test area
 
-       iso14443a_setup();
+// --------------------------------------      END test area
+       // start mkseconds counter
+       StartCountUS();
 
-       LED_A_ON();
-       LED_B_OFF();
-       LED_C_OFF();
+       // We need to listen to the high-frequency, peak-detected path.
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+       FpgaSetupSsc();
+
+  FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+       SpinDelay(200);
 
+       if (MF_DBGLEVEL >= 1)   Dbprintf("Started. 7buid=%d", _7BUID);
+       // calibrate mkseconds counter
+       GetDeltaCountUS();
        while (true) {
-               if(!iso14443a_select_card(uid, NULL, &cuid)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
-                       break;
-               };
+               WDT_HIT();
 
-               if(mifare_classic_auth(pcs, cuid, sectorNo * 4, keyType, ui64Key, AUTH_FIRST)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Auth error");
+               if(BUTTON_PRESS()) {
                        break;
-               };
+               }
+
+               // 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;
+                       if (vHf > MF_MINFIELDV) {
+                               cardSTATE_TO_IDLE();
+                               LED_A_ON();
+                       }
+               } 
+
+               if (cardSTATE != MFEMUL_NOFIELD) {
+                       res = EmGetCmd(receivedCmd, &len, RECV_CMD_SIZE); // (+ nextCycleTimeout)
+                       if (res == 2) {
+                               cardSTATE = MFEMUL_NOFIELD;
+                               LEDsoff();
+                               continue;
+                       }
+                       if(res) break;
+               }
                
-               if(mifare_classic_readblock(pcs, cuid, sectorNo * 4 + 0, dataoutbuf + 16 * 0)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Read block 0 error");
-                       break;
-               };
-               if(mifare_classic_readblock(pcs, cuid, sectorNo * 4 + 1, dataoutbuf + 16 * 1)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Read block 1 error");
-                       break;
-               };
-               if(mifare_classic_readblock(pcs, cuid, sectorNo * 4 + 2, dataoutbuf + 16 * 2)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Read block 2 error");
-                       break;
-               };
-               if(mifare_classic_readblock(pcs, cuid, sectorNo * 4 + 3, dataoutbuf + 16 * 3)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Read block 3 error");
-                       break;
-               };
+               //nextCycleTimeout = 0;
                
-               if(mifare_classic_halt(pcs, cuid)) {
-               if (MF_DBGLEVEL >= 1)   Dbprintf("Halt error");
-                       break;
-               };
+//             if (len) Dbprintf("len:%d cmd: %02x %02x %02x %02x", len, receivedCmd[0], receivedCmd[1], receivedCmd[2], receivedCmd[3]);
 
-               isOK = 1;
-               break;
-       }
-       
-       //  ----------------------------- crypto1 destroy
-       crypto1_destroy(pcs);
-       
-       if (MF_DBGLEVEL >= 2) DbpString("READ SECTOR FINISHED");
+               if (len != 4 && cardSTATE != MFEMUL_NOFIELD) { // len != 4 <---- speed up the code 4 authentication
+                       // REQ or WUP request in ANY state and WUP in HALTED state
+                       if (len == 1 && ((receivedCmd[0] == 0x26 && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == 0x52)) {
+                               selTimer = GetTickCount();
+                               EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == 0x52));
+                               cardSTATE = MFEMUL_SELECT1;
+
+                               // init crypto block
+                               LED_B_OFF();
+                               LED_C_OFF();
+                               crypto1_destroy(pcs);
+                               cardAUTHKEY = 0xff;
+                       }
+               }
+               
+               switch (cardSTATE) {
+                       case MFEMUL_NOFIELD:{
+                               break;
+                       }
+                       case MFEMUL_HALTED:{
+                               break;
+                       }
+                       case MFEMUL_IDLE:{
+                               break;
+                       }
+                       case MFEMUL_SELECT1:{
+                               // select all
+                               if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) {
+                                       EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1));
+                                       break;
+                               }
 
-       // add trace trailer
-       uid[0] = 0xff;
-       uid[1] = 0xff;
-       uid[2] = 0xff;
-       uid[3] = 0xff;
-       LogTrace(uid, 4, 0, 0, TRUE);
+                               // select card
+                               if (len == 9 && 
+                                               (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) {
+                                       if (!_7BUID) 
+                                               EmSendCmd(rSAK, sizeof(rSAK));
+                                       else
+                                               EmSendCmd(rSAK1, sizeof(rSAK1));
 
-       UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
-       memcpy(ack.d.asBytes, dataoutbuf, 16 * 2);
-       
-       LED_B_ON();
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
+                                       cuid = bytes_to_num(rUIDBCC1, 4);
+                                       if (!_7BUID) {
+                                               cardSTATE = MFEMUL_WORK;
+                                               LED_B_ON();
+                                               if (MF_DBGLEVEL >= 4)   Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer);
+                                               break;
+                                       } else {
+                                               cardSTATE = MFEMUL_SELECT2;
+                                               break;
+                                       }
+                               }
+                               
+                               break;
+                       }
+                       case MFEMUL_SELECT2:{
+                               if (!len) break;
+                       
+                               if (len == 2 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x20)) {
+                                       EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2));
+                                       break;
+                               }
 
-       SpinDelay(100);
-       
-       memcpy(ack.d.asBytes, dataoutbuf + 16 * 2, 16 * 2);
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();    
-
-       // Thats it...
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       LEDsoff();
-//  tracing = TRUE;
-
-}
-
-//-----------------------------------------------------------------------------
-// Select, Authenticaate, Read an MIFARE tag. 
-// read block
-//-----------------------------------------------------------------------------
-void MifareWriteBlock(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
-{
-       // params
-       uint8_t blockNo = arg0;
-       uint8_t keyType = arg1;
-       uint64_t ui64Key = 0;
-       byte_t blockdata[16];
-
-       ui64Key = bytes_to_num(datain, 6);
-       memcpy(blockdata, datain + 10, 16);
-       
-       // variables
-       byte_t isOK = 0;
-       uint8_t uid[8];
-       uint32_t cuid;
-       struct Crypto1State mpcs = {0, 0};
-       struct Crypto1State *pcs;
-       pcs = &mpcs;
-
-       // clear trace
-       traceLen = 0;
-//  tracing = false;
-
-       iso14443a_setup();
-
-       LED_A_ON();
-       LED_B_OFF();
-       LED_C_OFF();
-
-       while (true) {
-                       if(!iso14443a_select_card(uid, NULL, &cuid)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
-                       break;
-               };
-
-               if(mifare_classic_auth(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Auth error");
-                       break;
-               };
-               
-               if(mifare_classic_writeblock(pcs, cuid, blockNo, blockdata)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Write block error");
-                       break;
-               };
-
-               if(mifare_classic_halt(pcs, cuid)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Halt error");
-                       break;
-               };
-               
-               isOK = 1;
-               break;
-       }
-       
-       //  ----------------------------- crypto1 destroy
-       crypto1_destroy(pcs);
-       
-       if (MF_DBGLEVEL >= 2)   DbpString("WRITE BLOCK FINISHED");
-
-       // add trace trailer
-       uid[0] = 0xff;
-       uid[1] = 0xff;
-       uid[2] = 0xff;
-       uid[3] = 0xff;
-       LogTrace(uid, 4, 0, 0, TRUE);
-
-       UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
-       
-       LED_B_ON();
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();    
-
-
-       // Thats it...
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       LEDsoff();
-//  tracing = TRUE;
-
-}
-
-// Return 1 if the nonce is invalid else return 0
-int valid_nonce(uint32_t Nt, uint32_t NtEnc, uint32_t Ks1, byte_t * parity) {
-       return ((oddparity((Nt >> 24) & 0xFF) == ((parity[0]) ^ oddparity((NtEnc >> 24) & 0xFF) ^ BIT(Ks1,16))) & \
-       (oddparity((Nt >> 16) & 0xFF) == ((parity[1]) ^ oddparity((NtEnc >> 16) & 0xFF) ^ BIT(Ks1,8))) & \
-       (oddparity((Nt >> 8) & 0xFF) == ((parity[2]) ^ oddparity((NtEnc >> 8) & 0xFF) ^ BIT(Ks1,0)))) ? 1 : 0;
-}
-
-
-//-----------------------------------------------------------------------------
-// MIFARE nested authentication. 
-// 
-//-----------------------------------------------------------------------------
-void MifareNested(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain)
-{
-       // params
-       uint8_t blockNo = arg0;
-       uint8_t keyType = arg1;
-       uint8_t targetBlockNo = arg2 & 0xff;
-       uint8_t targetKeyType = (arg2 >> 8) & 0xff;
-       uint64_t ui64Key = 0;
-
-       ui64Key = bytes_to_num(datain, 6);
-       
-       // variables
-       int rtr, i, j, m, len;
-       int davg, dmin, dmax;
-       uint8_t uid[8];
-       uint32_t cuid, nt1, nt2, nttmp, nttest, par, ks1;
-       uint8_t par_array[4];
-       nestedVector nvector[NES_MAX_INFO + 1][10];
-       int nvectorcount[NES_MAX_INFO + 1];
-       int ncount = 0;
-       UsbCommand ack = {CMD_ACK, {0, 0, 0}};
-       struct Crypto1State mpcs = {0, 0};
-       struct Crypto1State *pcs;
-       pcs = &mpcs;
-       uint8_t* receivedAnswer = mifare_get_bigbufptr();
-
-       //init
-       for (i = 0; i < NES_MAX_INFO + 1; i++) nvectorcount[i] = 11;  //  11 - empty block;
-       
-       // clear trace
-       traceLen = 0;
-  tracing = false;
-       
-       iso14443a_setup();
-
-       LED_A_ON();
-       LED_B_ON();
-       LED_C_OFF();
-
-  FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-  SpinDelay(200);
-       
-       davg = dmax = 0;
-       dmin = 2000;
-
-       // test nonce distance
-       for (rtr = 0; rtr < 10; rtr++) {
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-    SpinDelay(100);
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-
-    // Test if the action was cancelled
-    if(BUTTON_PRESS()) {
-      break;
-    }
-
-               if(!iso14443a_select_card(uid, NULL, &cuid)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
-                       break;
-               };
-               
-               if(mifare_classic_authex(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST, &nt1)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Auth1 error");
-                       break;
-               };
-
-               if(mifare_classic_authex(pcs, cuid, blockNo, keyType, ui64Key, AUTH_NESTED, &nt2)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Auth2 error");
-                       break;
-               };
-               
-               nttmp = prng_successor(nt1, 500);
-               for (i = 501; i < 2000; i++) {
-                       nttmp = prng_successor(nttmp, 1);
-                       if (nttmp == nt2) break;
-               }
-               
-               if (i != 2000) {
-                       davg += i;
-                       if (dmin > i) dmin = i;
-                       if (dmax < i) dmax = i;
-                       if (MF_DBGLEVEL >= 4)   Dbprintf("r=%d nt1=%08x nt2=%08x distance=%d", rtr, nt1, nt2, i);
-               }
-       }
-       
-       if (rtr == 0)   return;
-
-       davg = davg / rtr;
-       if (MF_DBGLEVEL >= 3)   Dbprintf("distance: min=%d max=%d avg=%d", dmin, dmax, davg);
-
-       LED_B_OFF();
-
-//  -------------------------------------------------------------------------------------------------  
-       
-       LED_C_ON();
-
-       //  get crypted nonces for target sector
-       for (rtr = 0; rtr < NS_RETRIES_GETNONCE; rtr++) {
-       if (MF_DBGLEVEL >= 4)                   Dbprintf("------------------------------");
-
-               FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-    SpinDelay(100);
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-
-    // Test if the action was cancelled
-    if(BUTTON_PRESS()) {
-      break;
-    }
-
-               if(!iso14443a_select_card(uid, NULL, &cuid)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Can't select card");
-                       break;
-               };
-               
-               if(mifare_classic_authex(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST, &nt1)) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Auth1 error");
-                       break;
-               };
-
-               // nested authentication
-               len = mifare_sendcmd_shortex(pcs, AUTH_NESTED, 0x60 + (targetKeyType & 0x01), targetBlockNo, receivedAnswer, &par);
-               if (len != 4) {
-                       if (MF_DBGLEVEL >= 1)   Dbprintf("Auth2 error len=%d", len);
-                       break;
-               };
-       
-               nt2 = bytes_to_num(receivedAnswer, 4);          
-               if (MF_DBGLEVEL >= 4)   Dbprintf("r=%d nt1=%08x nt2enc=%08x nt2par=%08x", rtr, nt1, nt2, par);
-               
-               // Parity validity check
-               for (i = 0; i < 4; i++) {
-                       par_array[i] = (oddparity(receivedAnswer[i]) != ((par & 0x08) >> 3));
-                       par = par << 1;
-               }
-               
-               ncount = 0;
-               for (m = dmin - NS_TOLERANCE; m < dmax + NS_TOLERANCE; m++) {
-                       nttest = prng_successor(nt1, m);
-                       ks1 = nt2 ^ nttest;
-
-                       if (valid_nonce(nttest, nt2, ks1, par_array) && (ncount < 11)){
-                               
-                               nvector[NES_MAX_INFO][ncount].nt = nttest;
-                               nvector[NES_MAX_INFO][ncount].ks1 = ks1;
-                               ncount++;
-                               nvectorcount[NES_MAX_INFO] = ncount;
-                               if (MF_DBGLEVEL >= 4)   Dbprintf("valid m=%d ks1=%08x nttest=%08x", m, ks1, nttest);
-                       }
+                               // select 2 card
+                               if (len == 9 && 
+                                               (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0)) {
+                                       EmSendCmd(rSAK, sizeof(rSAK));
 
-               }
-               
-               // select vector with length less than got
-               if (nvectorcount[NES_MAX_INFO] != 0) {
-                       m = NES_MAX_INFO;
-                       
-                       for (i = 0; i < NES_MAX_INFO; i++)
-                               if (nvectorcount[i] > 10) {
-                                       m = i;
+                                       cuid = bytes_to_num(rUIDBCC2, 4);
+                                       cardSTATE = MFEMUL_WORK;
+                                       LED_B_ON();
+                                       if (MF_DBGLEVEL >= 4)   Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer);
                                        break;
                                }
                                
-                       if (m == NES_MAX_INFO)
-                               for (i = 0; i < NES_MAX_INFO; i++)
-                                       if (nvectorcount[NES_MAX_INFO] < nvectorcount[i]) {
-                                               m = i;
+                               // i guess there is a command). go into the work state.
+                               if (len != 4) break;
+                               cardSTATE = MFEMUL_WORK;
+                               goto lbWORK;
+                       }
+                       case MFEMUL_AUTH1:{
+                               if (len == 8) {
+                                       // --- crypto
+                                       //rn_enc = bytes_to_num(receivedCmd, 4);
+                                       //cardRn = rn_enc ^ crypto1_word(pcs, rn_enc , 1);
+                                       cardRr = bytes_to_num(&receivedCmd[4], 4) ^ crypto1_word(pcs, 0, 0);
+                                       // test if auth OK
+                                       if (cardRr != prng_successor(nonce, 64)){
+                                               if (MF_DBGLEVEL >= 4)   Dbprintf("AUTH FAILED. cardRr=%08x, succ=%08x", cardRr, prng_successor(nonce, 64));
+                                               cardSTATE_TO_IDLE();
                                                break;
                                        }
-                                       
-                       if (m != NES_MAX_INFO) {
-                               for (i = 0; i < nvectorcount[m]; i++) {
-                                       nvector[m][i] = nvector[NES_MAX_INFO][i];
+                                       ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
+                                       num_to_bytes(ans, 4, rAUTH_AT);
+                                       // --- crypto
+                                       EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
+                                       cardSTATE = MFEMUL_AUTH2;
+                               } else {
+                                       cardSTATE_TO_IDLE();
                                }
-                               nvectorcount[m] = nvectorcount[NES_MAX_INFO];
-                       }
-               }
-       }
-
-       LED_C_OFF();
-       
-       //  ----------------------------- crypto1 destroy
-       crypto1_destroy(pcs);
-       
-       // add trace trailer
-       uid[0] = 0xff;
-       uid[1] = 0xff;
-       uid[2] = 0xff;
-       uid[3] = 0xff;
-       LogTrace(uid, 4, 0, 0, TRUE);
-
-       for (i = 0; i < NES_MAX_INFO; i++) {
-               if (nvectorcount[i] > 10) continue;
-               
-               for (j = 0; j < nvectorcount[i]; j += 5) {
-                       ncount = nvectorcount[i] - j;
-                       if (ncount > 5) ncount = 5; 
-
-                       ack.arg[0] = 0; // isEOF = 0
-                       ack.arg[1] = ncount;
-                       ack.arg[2] = targetBlockNo + (targetKeyType * 0x100);
-                       memset(ack.d.asBytes, 0x00, sizeof(ack.d.asBytes));
-                       
-                       memcpy(ack.d.asBytes, &cuid, 4);
-                       for (m = 0; m < ncount; m++) {
-                               memcpy(ack.d.asBytes + 8 + m * 8 + 0, &nvector[i][m + j].nt, 4);
-                               memcpy(ack.d.asBytes + 8 + m * 8 + 4, &nvector[i][m + j].ks1, 4);
-                       }
-       
-                       LED_B_ON();
-                       SpinDelay(100);
-                       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-                       LED_B_OFF();    
-               }
-       }
-
-       // finalize list
-       ack.arg[0] = 1; // isEOF = 1
-       ack.arg[1] = 0;
-       ack.arg[2] = 0;
-       memset(ack.d.asBytes, 0x00, sizeof(ack.d.asBytes));
-       
-       LED_B_ON();
-       SpinDelay(300);
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();    
-
-       if (MF_DBGLEVEL >= 4)   DbpString("NESTED FINISHED");
-
-       // Thats it...
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       LEDsoff();
-       
-  tracing = TRUE;
-}
-
-//-----------------------------------------------------------------------------
-// MIFARE check keys. key count up to 8. 
-// 
-//-----------------------------------------------------------------------------
-void MifareChkKeys(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
-{
-  // params
-       uint8_t blockNo = arg0;
-       uint8_t keyType = arg1;
-       uint8_t keyCount = arg2;
-       uint64_t ui64Key = 0;
-       
-       // variables
-       int i;
-       byte_t isOK = 0;
-       uint8_t uid[8];
-       uint32_t cuid;
-       struct Crypto1State mpcs = {0, 0};
-       struct Crypto1State *pcs;
-       pcs = &mpcs;
-       
-       // clear debug level
-       int OLD_MF_DBGLEVEL = MF_DBGLEVEL;      
-       MF_DBGLEVEL = MF_DBG_NONE;
-       
-       // clear trace
-       traceLen = 0;
-  tracing = TRUE;
-
-       iso14443a_setup();
-
-       LED_A_ON();
-       LED_B_OFF();
-       LED_C_OFF();
-
-       SpinDelay(300);
-       for (i = 0; i < keyCount; i++) {
-               FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-    SpinDelay(100);
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-
-               if(!iso14443a_select_card(uid, NULL, &cuid)) {
-                       if (OLD_MF_DBGLEVEL >= 1)       Dbprintf("Can't select card");
-                       break;
-               };
-
-               ui64Key = bytes_to_num(datain + i * 6, 6);
-               if(mifare_classic_auth(pcs, cuid, blockNo, keyType, ui64Key, AUTH_FIRST)) {
-                       continue;
-               };
-               
-               isOK = 1;
-               break;
-       }
-       
-       //  ----------------------------- crypto1 destroy
-       crypto1_destroy(pcs);
-       
-       // add trace trailer
-       uid[0] = 0xff;
-       uid[1] = 0xff;
-       uid[2] = 0xff;
-       uid[3] = 0xff;
-       LogTrace(uid, 4, 0, 0, TRUE);
-
-       UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
-       if (isOK) memcpy(ack.d.asBytes, datain + i * 6, 6);
-       
-       LED_B_ON();
-       UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
-       LED_B_OFF();
-
-  // Thats it...
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       LEDsoff();
-
-       // restore debug level
-       MF_DBGLEVEL = OLD_MF_DBGLEVEL;  
-}
-
-//-----------------------------------------------------------------------------
-// MIFARE 1K simulate. 
-// 
-//-----------------------------------------------------------------------------
-void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
-{
-       int cardSTATE = MFEMUL_NOFIELD;
-       int vHf = 0;    // in mV
-       int res;
-       uint32_t timer = 0;
-       int len = 0;
-       uint8_t cardAUTHSC = 0;
-       uint8_t cardAUTHKEY = 0xff;  // no authentication
-       uint32_t cuid = 0;
-       struct Crypto1State mpcs = {0, 0};
-       struct Crypto1State *pcs;
-       pcs = &mpcs;
-       
-       uint64_t key64 = 0xffffffffffffULL;
-       
-       uint8_t* receivedCmd = mifare_get_bigbufptr();
-       
-       static uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k
-
-       static uint8_t rUIDBCC1[] = {0xde,  0xad,  0xbe,  0xaf,  0x62}; 
-       static uint8_t rUIDBCC2[] = {0xde,  0xad,  0xbe,  0xaf,  0x62}; // !!!
-               
-       static uint8_t rSAK[] = {0x08,  0xb6,  0xdd};
-
-       static uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04};
-       
-// --------------------------------------      test area
-
-
-// --------------------------------------      END test area
-
-       // We need to listen to the high-frequency, peak-detected path.
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-       FpgaSetupSsc();
-
-  FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
-       SpinDelay(200);
-
-Dbprintf("--> start");
-       while (true) {
-               WDT_HIT();
-//             timer = GetTickCount();
-//             Dbprintf("time: %d", GetTickCount() - timer);
-
-               // 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;
-                       if (vHf > MF_MINFIELDV) {
-                               cardSTATE = MFEMUL_IDLE;
-                               LED_A_ON();
+                               if (cardSTATE != MFEMUL_AUTH2) break;
                        }
-               } 
-
-               if (cardSTATE != MFEMUL_NOFIELD) {
-                       res = EmGetCmd(receivedCmd, &len, 100);
-                       if (res == 2) {
-                               cardSTATE = MFEMUL_NOFIELD;
-                               LEDsoff();
-                               continue;
-                       }
-                       if(res) break;
-               }
-               
-               if(BUTTON_PRESS()) {
-                       break;
-               }
-       
-//             if (len) Dbprintf("len:%d cmd: %02x %02x %02x %02x", len, receivedCmd[0], receivedCmd[1], receivedCmd[2], receivedCmd[3]);
-               
-               switch (cardSTATE) {
-                       case MFEMUL_NOFIELD:{
+                       case MFEMUL_AUTH2:{
+                               LED_C_ON();
+                               cardSTATE = MFEMUL_WORK;
+                               if (MF_DBGLEVEL >= 4)   Dbprintf("AUTH COMPLETED. sec=%d, key=%d time=%d", cardAUTHSC, cardAUTHKEY, GetTickCount() - authTimer);
                                break;
                        }
-                       case MFEMUL_HALTED:{
-                               // WUP request
-                               if (!(len == 1 && receivedCmd[0] == 0x52)) break;
-                       }
-                       case MFEMUL_IDLE:{
-                               // REQ or WUP request
-                               if (len == 1 && (receivedCmd[0] == 0x26 || receivedCmd[0] == 0x52)) {
-timer = GetTickCount();
-                                       EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == 0x52));
-                                       cardSTATE = MFEMUL_SELECT1;
+                       case MFEMUL_WORK:{
+lbWORK:        if (len == 0) break;
+                               
+                               if (cardAUTHKEY == 0xff) {
+                                       // first authentication
+                                       if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
+                                               authTimer = GetTickCount();
+
+                                               cardAUTHSC = receivedCmd[1] / 4;  // received block num
+                                               cardAUTHKEY = receivedCmd[0] - 0x60;
+
+                                               // --- crypto
+                                               crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
+                                               ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); 
+                                               num_to_bytes(nonce, 4, rAUTH_AT);
+                                               EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
+                                               // --- crypto
+                                               
+//   last working revision 
+//                                             EmSendCmd14443aRaw(resp1, resp1Len, 0);
+//                                             LogTrace(NULL, 0, GetDeltaCountUS(), 0, true);
+
+                                               cardSTATE = MFEMUL_AUTH1;
+                                               //nextCycleTimeout = 10;
+                                               break;
+                                       }
+                               } else {
+                                       // decrypt seqence
+                                       mf_crypto1_decrypt(pcs, receivedCmd, len);
                                        
-                                       // init crypto block
-                                       crypto1_destroy(pcs);
-                                       cardAUTHKEY = 0xff;
+                                       // nested authentication
+                                       if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
+                                               authTimer = GetTickCount();
+
+                                               cardAUTHSC = receivedCmd[1] / 4;  // received block num
+                                               cardAUTHKEY = receivedCmd[0] - 0x60;
+
+                                               // --- crypto
+                                               crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
+                                               ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0); 
+                                               num_to_bytes(ans, 4, rAUTH_AT);
+                                               EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
+                                               // --- crypto
+
+                                               cardSTATE = MFEMUL_AUTH1;
+                                               //nextCycleTimeout = 10;
+                                               break;
+                                       }
                                }
-                               break;
-                       }
-                       case MFEMUL_SELECT1:{
-                               // select all
-                               if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) {
-                                       EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1));
-
-                                       if (rUIDBCC1[0] == 0x88) {
-                                               cardSTATE = MFEMUL_SELECT2;
+                               
+                               // rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued
+                               // BUT... ACK --> NACK
+                               if (len == 1 && receivedCmd[0] == CARD_ACK) {
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                       break;
+                               }
+                               
+                               // rule 12 of 7.5.3. in ISO 14443-4. R(NAK) --> R(ACK)
+                               if (len == 1 && receivedCmd[0] == CARD_NACK_NA) {
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+                                       break;
+                               }
+                               
+                               // read block
+                               if (len == 4 && receivedCmd[0] == 0x30) {
+                                       if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {
+                                               EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                               break;
+                                       }
+                                       emlGetMem(response, receivedCmd[1], 1);
+                                       AppendCrc14443a(response, 16);
+                                       mf_crypto1_encrypt(pcs, response, 18, &par);
+                                       EmSendCmdPar(response, 18, par);
+                                       break;
+                               }
+                               
+                               // write block
+                               if (len == 4 && receivedCmd[0] == 0xA0) {
+                                       if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {
+                                               EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                               break;
+                                       }
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+                                       //nextCycleTimeout = 50;
+                                       cardSTATE = MFEMUL_WRITEBL2;
+                                       cardWRBL = receivedCmd[1];
+                                       break;
+                               }
+                       
+                               // works with cardINTREG
+                               
+                               // increment, decrement, restore
+                               if (len == 4 && (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2)) {
+                                       if (receivedCmd[1] >= 16 * 4 || 
+                                                       receivedCmd[1] / 4 != cardAUTHSC || 
+                                                       emlCheckValBl(receivedCmd[1])) {
+                                               EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                               break;
                                        }
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+                                       if (receivedCmd[0] == 0xC1)
+                                               cardSTATE = MFEMUL_INTREG_INC;
+                                       if (receivedCmd[0] == 0xC0)
+                                               cardSTATE = MFEMUL_INTREG_DEC;
+                                       if (receivedCmd[0] == 0xC2)
+                                               cardSTATE = MFEMUL_INTREG_REST;
+                                       cardWRBL = receivedCmd[1];
+                                       
+                                       break;
                                }
+                               
 
-                               // select card
-                               if (len == 9 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70)) {
-                                       EmSendCmd(rSAK, sizeof(rSAK));
+                               // transfer
+                               if (len == 4 && receivedCmd[0] == 0xB0) {
+                                       if (receivedCmd[1] >= 16 * 4 || receivedCmd[1] / 4 != cardAUTHSC) {
+                                               EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                               break;
+                                       }
+                                       
+                                       if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1]))
+                                               EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                       else
+                                               EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+                                               
+                                       break;
+                               }
 
-                                       cuid = bytes_to_num(rUIDBCC1, 4);
-                                       cardSTATE = MFEMUL_WORK;
-                                       LED_B_ON();
-Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - timer);
+                               // halt
+                               if (len == 4 && (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00)) {
+                                       LED_B_OFF();
+                                       LED_C_OFF();
+                                       cardSTATE = MFEMUL_HALTED;
+                                       if (MF_DBGLEVEL >= 4)   Dbprintf("--> HALTED. Selected time: %d ms",  GetTickCount() - selTimer);
+                                       break;
                                }
                                
-                               break;
-                       }
-                       case MFEMUL_SELECT2:{
-                                       EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2));
+                               // command not allowed
+                               if (len == 4) {
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                       break;
+                               }
 
-                               cuid = bytes_to_num(rUIDBCC2, 4);
-                               cardSTATE = MFEMUL_WORK;
-                               LED_B_ON();
-Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - timer);
+                               // case break
                                break;
                        }
-                       case MFEMUL_AUTH1:{
-if (len) Dbprintf("au1 len:%d cmd: %02x %02x %02x %02x", len, receivedCmd[0], receivedCmd[1], receivedCmd[2], receivedCmd[3]);
-                               if (len == 8) {
-                               
+                       case MFEMUL_WRITEBL2:{
+                               if (len == 18){
+                                       mf_crypto1_decrypt(pcs, receivedCmd, len);
+                                       emlSetMem(receivedCmd, cardWRBL, 1);
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+                                       cardSTATE = MFEMUL_WORK;
+                                       break;
+                               } else {
+                                       cardSTATE_TO_IDLE();
+                                       break;
                                }
                                break;
                        }
-                       case MFEMUL_AUTH2:{
-
-                               LED_C_ON();
-Dbprintf("AUTH COMPLETED. sec=%d, key=%d time=%d", cardAUTHSC, cardAUTHKEY, GetTickCount() - timer);
+                       
+                       case MFEMUL_INTREG_INC:{
+                               mf_crypto1_decrypt(pcs, receivedCmd, len);
+                               memcpy(&ans, receivedCmd, 4);
+                               if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                       cardSTATE_TO_IDLE();
+                                       break;
+                               }
+                               cardINTREG = cardINTREG + ans;
+                               cardSTATE = MFEMUL_WORK;
                                break;
                        }
-                       case MFEMUL_WORK:{
-                               // auth
-                               if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
-timer = GetTickCount();
-                                       crypto1_create(pcs, key64);
-//                                     if (cardAUTHKEY == 0xff) { // first auth
-                                       crypto1_word(pcs, cuid ^ bytes_to_num(rAUTH_NT, 4), 0); // uid ^ nonce
-//                                     } else { // nested auth
-//                                     }
-
-                                       EmSendCmd(rAUTH_NT, sizeof(rAUTH_NT));
-                                       cardAUTHSC = receivedCmd[1];
-                                       cardAUTHKEY = receivedCmd[0] - 0x60;
-                                       cardSTATE = MFEMUL_AUTH1;
+                       case MFEMUL_INTREG_DEC:{
+                               mf_crypto1_decrypt(pcs, receivedCmd, len);
+                               memcpy(&ans, receivedCmd, 4);
+                               if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                       cardSTATE_TO_IDLE();
+                                       break;
                                }
-                               
-                               // halt
-                               if (len == 4 && (receivedCmd[0] == 0x50 || receivedCmd[0] == 0x00)) {
-                                       cardSTATE = MFEMUL_HALTED;
-                                       LED_B_OFF();
+                               cardINTREG = cardINTREG - ans;
+                               cardSTATE = MFEMUL_WORK;
+                               break;
+                       }
+                       case MFEMUL_INTREG_REST:{
+                               mf_crypto1_decrypt(pcs, receivedCmd, len);
+                               memcpy(&ans, receivedCmd, 4);
+                               if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
+                                       EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+                                       cardSTATE_TO_IDLE();
+                                       break;
                                }
+                               cardSTATE = MFEMUL_WORK;
                                break;
                        }
                
@@ -2688,5 +2519,9 @@ timer = GetTickCount();
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        LEDsoff();
 
-       DbpString("Emulator stopped.");
+       // add trace trailer
+       memset(rAUTH_NT, 0x44, 4);
+       LogTrace(rAUTH_NT, 4, 0, 0, TRUE);
+
+       if (MF_DBGLEVEL >= 1)   Dbprintf("Emulator stopped. Tracing: %d  trace length: %d ",    tracing, traceLen);
 }
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