]> cvs.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/iclass.c
fix 'hf iclass sim':
[proxmark3-svn] / armsrc / iclass.c
index 5d7375a7bd8ad982778ad41046925570e9fa33e0..2e3a4db896a3e296fc5cf5295071746672a7f8ed 100644 (file)
 #include "apps.h"
 #include "util.h"
 #include "string.h"
+#include "printf.h"
 #include "common.h"
 #include "cmd.h"
 #include "iso14443a.h"
+#include "iso15693.h"
 // Needed for CRC in emulation mode;
 // same construction as in ISO 14443;
 // different initial value (CRC_ICLASS)
@@ -391,8 +393,7 @@ static RAMFUNC int ManchesterDecoding(int v) {
                        Demod.shiftReg = 0;
                        Demod.samples = 0;
                        if (Demod.posCount) {
-                               //if (trigger) LED_A_OFF();  // Not useful in this case...
-                               switch(Demod.syncBit) {
+                               switch (Demod.syncBit) {
                                        case 0x08: Demod.samples = 3; break;
                                        case 0x04: Demod.samples = 2; break;
                                        case 0x02: Demod.samples = 1; break;
@@ -414,12 +415,13 @@ static RAMFUNC int ManchesterDecoding(int v) {
 
                }
        } else {
+               // state is DEMOD is in SYNC from here on.
                modulation = bit & Demod.syncBit;
                modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
 
                Demod.samples += 4;
 
-               if (Demod.posCount==0) {
+               if (Demod.posCount == 0) {
                        Demod.posCount = 1;
                        if (modulation) {
                                Demod.sub = SUB_FIRST_HALF;
@@ -428,14 +430,6 @@ static RAMFUNC int ManchesterDecoding(int v) {
                        }
                } else {
                        Demod.posCount = 0;
-                       /*(modulation && (Demod.sub == SUB_FIRST_HALF)) {
-                               if (Demod.state!=DEMOD_ERROR_WAIT) {
-                                       Demod.state = DEMOD_ERROR_WAIT;
-                                       Demod.output[Demod.len] = 0xaa;
-                                       error = 0x01;
-                               }
-                       }*/
-                       //else if (modulation) {
                        if (modulation) {
                                if (Demod.sub == SUB_FIRST_HALF) {
                                        Demod.sub = SUB_BOTH;
@@ -447,23 +441,16 @@ static RAMFUNC int ManchesterDecoding(int v) {
                                        Demod.output[Demod.len] = 0x0f;
                                        Demod.len++;
                                        Demod.state = DEMOD_UNSYNCD;
-//                  error = 0x0f;
                                        return true;
                                } else {
                                        Demod.state = DEMOD_ERROR_WAIT;
                                        error = 0x33;
                                }
-                               /*if (Demod.state!=DEMOD_ERROR_WAIT) {
-                                       Demod.state = DEMOD_ERROR_WAIT;
-                                       Demod.output[Demod.len] = 0xaa;
-                                       error = 0x01;
-                               }*/
                        }
 
                        switch(Demod.state) {
                                case DEMOD_START_OF_COMMUNICATION:
                                        if (Demod.sub == SUB_BOTH) {
-                                               //Demod.state = DEMOD_MANCHESTER_D;
                                                Demod.state = DEMOD_START_OF_COMMUNICATION2;
                                                Demod.posCount = 1;
                                                Demod.sub = SUB_NONE;
@@ -484,10 +471,7 @@ static RAMFUNC int ManchesterDecoding(int v) {
                                        break;
                                case DEMOD_START_OF_COMMUNICATION3:
                                        if (Demod.sub == SUB_SECOND_HALF) {
-//                      Demod.state = DEMOD_MANCHESTER_D;
                                                Demod.state = DEMOD_SOF_COMPLETE;
-                                               //Demod.output[Demod.len] = Demod.syncBit & 0xFF;
-                                               //Demod.len++;
                                        } else {
                                                Demod.output[Demod.len] = 0xab;
                                                Demod.state = DEMOD_ERROR_WAIT;
@@ -543,16 +527,6 @@ static RAMFUNC int ManchesterDecoding(int v) {
                                        break;
                        }
 
-                       /*if (Demod.bitCount>=9) {
-                               Demod.output[Demod.len] = Demod.shiftReg & 0xff;
-                               Demod.len++;
-
-                               Demod.parityBits <<= 1;
-                               Demod.parityBits ^= ((Demod.shiftReg >> 8) & 0x01);
-
-                               Demod.bitCount = 0;
-                               Demod.shiftReg = 0;
-                       }*/
                        if (Demod.bitCount >= 8) {
                                Demod.shiftReg >>= 1;
                                Demod.output[Demod.len] = (Demod.shiftReg & 0xff);
@@ -782,133 +756,7 @@ void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
        }
 }
 
-//-----------------------------------------------------------------------------
-// Wait for commands from reader
-// Stop when button is pressed
-// Or return true when command is captured
-//-----------------------------------------------------------------------------
-static int GetIClassCommandFromReader(uint8_t *received, int *len, int maxLen)
-{
-       // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
-       // only, since we are receiving, not transmitting).
-       // Signal field is off with the appropriate LED
-       LED_D_OFF();
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
-
-       // Now run a `software UART' on the stream of incoming samples.
-       Uart.output = received;
-       Uart.byteCntMax = maxLen;
-       Uart.state = STATE_UNSYNCD;
-
-       for (;;) {
-               WDT_HIT();
-
-               if (BUTTON_PRESS()) return false;
-
-               if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-                       AT91C_BASE_SSC->SSC_THR = 0x00;
-               }
-               if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-                       uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-
-                       if (OutOfNDecoding(b & 0x0f)) {
-                               *len = Uart.byteCnt;
-                               return true;
-                       }
-               }
-       }
-}
-
-static uint8_t encode4Bits(const uint8_t b) {
-       uint8_t c = b & 0xF;
-       // OTA, the least significant bits first
-       //         The columns are
-       //               1 - Bit value to send
-       //               2 - Reversed (big-endian)
-       //               3 - Encoded
-       //               4 - Hex values
-
-       switch(c){
-       //                          1       2         3         4
-         case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55
-         case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95
-         case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65
-         case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5
-         case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59
-         case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99
-         case 9:  return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69
-         case 8:  return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9
-         case 7:  return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56
-         case 6:  return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96
-         case 5:  return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66
-         case 4:  return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6
-         case 3:  return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a
-         case 2:  return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a
-         case 1:  return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a
-         default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa
-
-       }
-}
-
-//-----------------------------------------------------------------------------
-// Prepare tag messages
-//-----------------------------------------------------------------------------
-static void CodeIClassTagAnswer(const uint8_t *cmd, int len) {
-
-       /*
-        * SOF comprises 3 parts;
-        * * An unmodulated time of 56.64 us
-        * * 24 pulses of 423.75 kHz (fc/32)
-        * * A logic 1, which starts with an unmodulated time of 18.88us
-        *   followed by 8 pulses of 423.75kHz (fc/32)
-        *
-        *
-        * EOF comprises 3 parts:
-        * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated
-        *   time of 18.88us.
-        * - 24 pulses of fc/32
-        * - An unmodulated time of 56.64 us
-        *
-        *
-        * A logic 0 starts with 8 pulses of fc/32
-        * followed by an unmodulated time of 256/fc (~18,88us).
-        *
-        * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by
-        * 8 pulses of fc/32 (also 18.88us)
-        *
-        * The mode FPGA_HF_SIMULATOR_MODULATE_424K_8BIT which we use to simulate tag,
-        * works like this.
-        * - A 1-bit input to the FPGA becomes 8 pulses on 423.5kHz (fc/32) (18.88us).
-        * - A 0-bit input to the FPGA becomes an unmodulated time of 18.88us
-        *
-        * In this mode the SOF can be written as 00011101 = 0x1D
-        * The EOF can be written as 10111000 = 0xb8
-        * A logic 1 is 01
-        * A logic 0 is 10
-        *
-        * */
-
-       int i;
-
-       ToSendReset();
-
-       // Send SOF
-       ToSend[++ToSendMax] = 0x1D;
-
-       for (i = 0; i < len; i++) {
-               uint8_t b = cmd[i];
-               ToSend[++ToSendMax] = encode4Bits(b & 0xF);       // Least significant half
-               ToSend[++ToSendMax] = encode4Bits((b >>4) & 0xF); // Most significant half
-       }
-
-       // Send EOF
-       ToSend[++ToSendMax] = 0xB8;
-       //lastProxToAirDuration  = 8*ToSendMax - 3*8 - 3*8;//Not counting zeroes in the beginning or end
-       // Convert from last byte pos to length
-       ToSendMax++;
-}
-
-// Only SOF
+// Encode SOF only
 static void CodeIClassTagSOF() {
        //So far a dummy implementation, not used
        //int lastProxToAirDuration =0;
@@ -926,61 +774,21 @@ static void AppendCrc(uint8_t *data, int len) {
        ComputeCrc14443(CRC_ICLASS, data, len, data+len, data+len+1);
 }
 
-static int SendIClassAnswer(uint8_t *resp, int respLen, int delay) {
-       int i = 0, d = 0;//, u = 0, d = 0;
-       uint8_t b = 0;
-
-       //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K_8BIT);
-
-       AT91C_BASE_SSC->SSC_THR = 0x00;
-       FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR);
-       while (!BUTTON_PRESS()) {
-               if ((AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)){
-                       b = AT91C_BASE_SSC->SSC_RHR; (void) b;
-               }
-               if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)){
-                       b = 0x00;
-                       if (d < delay) {
-                               d++;
-                       }
-                       else {
-                               if (i < respLen) {
-                                       b = resp[i];
-                                       //Hack
-                                       //b = 0xAC;
-                               }
-                               i++;
-                       }
-                       AT91C_BASE_SSC->SSC_THR = b;
-               }
-
-//      if (i > respLen +4) break;
-               if (i > respLen + 1) break;
-       }
-
-       return 0;
-}
-
-
-#define MODE_SIM_CSN        0
-#define MODE_EXIT_AFTER_MAC 1
-#define MODE_FULLSIM        2
 
 /**
  * @brief Does the actual simulation
- * @param csn - csn to use
- * @param breakAfterMacReceived if true, returns after reader MAC has been received.
  */
 int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
+
        // free eventually allocated BigBuf memory
        BigBuf_free_keep_EM();
 
        State cipher_state;
-//  State cipher_state_reserve;
-       uint8_t *csn = BigBuf_get_EM_addr();
-       uint8_t *emulator = csn;
-       uint8_t sof_data[] = { 0x0F} ;
+
+       uint8_t *emulator = BigBuf_get_EM_addr();
+       uint8_t *csn = emulator;
+       uint8_t sof_data[] = { 0x0F } ;
+
        // CSN followed by two CRC bytes
        uint8_t anticoll_data[10] = { 0 };
        uint8_t csn_data[10] = { 0 };
@@ -991,21 +799,26 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
        rotateCSN(csn_data, anticoll_data);
 
        // Compute CRC on both CSNs
-       ComputeCrc14443(CRC_ICLASS, anticoll_data, 8, &anticoll_data[8], &anticoll_data[9]);
-       ComputeCrc14443(CRC_ICLASS, csn_data, 8, &csn_data[8], &csn_data[9]);
+       AppendCrc(anticoll_data, 8);
+       AppendCrc(csn_data, 8);
 
        uint8_t diversified_key[8] = { 0 };
        // e-Purse
-       uint8_t card_challenge_data[8] = { 0x00 };
-       if (simulationMode == MODE_FULLSIM) {
-               //The diversified key should be stored on block 3
-               //Get the diversified key from emulator memory
-               memcpy(diversified_key, emulator + (8*3), 8);
-               //Card challenge, a.k.a e-purse is on block 2
+       uint8_t card_challenge_data[8] = { 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+       //uint8_t card_challenge_data[8] = { 0 };
+       if (simulationMode == ICLASS_SIM_MODE_FULL) {
+               // The diversified key should be stored on block 3
+               // Get the diversified key from emulator memory
+               memcpy(diversified_key, emulator + (8 * 3), 8);
+               // Card challenge, a.k.a e-purse is on block 2
                memcpy(card_challenge_data, emulator + (8 * 2), 8);
-               //Precalculate the cipher state, feeding it the CC
+               // Precalculate the cipher state, feeding it the CC
                cipher_state = opt_doTagMAC_1(card_challenge_data, diversified_key);
        }
+       // save card challenge for sim2,4 attack
+       if (reader_mac_buf != NULL) {
+               memcpy(reader_mac_buf, card_challenge_data, 8);
+       }
 
        int exitLoop = 0;
        // Reader 0a
@@ -1026,234 +839,320 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 
        // Anticollision CSN (rotated CSN)
        // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
-       uint8_t *resp_anticoll = BigBuf_malloc(28);
+       uint8_t *resp_anticoll = BigBuf_malloc(22);
        int resp_anticoll_len;
 
-       // CSN
+       // CSN (block 0)
        // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
-       uint8_t *resp_csn = BigBuf_malloc(30);
+       uint8_t *resp_csn = BigBuf_malloc(22);
        int resp_csn_len;
 
-       // e-Purse
+       // configuration (block 1) picopass 2ks
+       uint8_t *resp_conf = BigBuf_malloc(22);
+       int resp_conf_len;
+       uint8_t conf_data[10] = {0x12, 0xFF, 0xFF, 0xFF, 0x7F, 0x1F, 0xFF, 0x3C, 0x00, 0x00};
+       AppendCrc(conf_data, 8);
+
+       // e-Purse (block 2)
        // 18: Takes 2 bytes for SOF/EOF and 8 * 2 = 16 bytes (2 bytes/bit)
-       uint8_t *resp_cc = BigBuf_malloc(20);
+       uint8_t *resp_cc = BigBuf_malloc(18);
        int resp_cc_len;
 
+       // Kd, Kc (blocks 3 and 4). Cannot be read. Always respond with 0xff bytes only
+       uint8_t *resp_ff = BigBuf_malloc(22);
+       int resp_ff_len;
+       uint8_t ff_data[10] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00};
+       AppendCrc(ff_data, 8);
+
+       // Application Issuer Area (block 5)
+       uint8_t *resp_aia = BigBuf_malloc(22);
+       int resp_aia_len;
+       uint8_t aia_data[10] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00};
+       AppendCrc(aia_data, 8);
+
        uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
        int len;
 
        // Prepare card messages
        ToSendMax = 0;
 
-       // First card answer: SOF
+       // First card answer: SOF only
        CodeIClassTagSOF();
        memcpy(resp_sof, ToSend, ToSendMax);
        resp_sof_Len = ToSendMax;
 
        // Anticollision CSN
-       CodeIClassTagAnswer(anticoll_data, sizeof(anticoll_data));
+       CodeIso15693AsTag(anticoll_data, sizeof(anticoll_data));
        memcpy(resp_anticoll, ToSend, ToSendMax);
        resp_anticoll_len = ToSendMax;
 
-       // CSN
-       CodeIClassTagAnswer(csn_data, sizeof(csn_data));
+       // CSN (block 0)
+       CodeIso15693AsTag(csn_data, sizeof(csn_data));
        memcpy(resp_csn, ToSend, ToSendMax);
        resp_csn_len = ToSendMax;
 
-       // e-Purse
-       CodeIClassTagAnswer(card_challenge_data, sizeof(card_challenge_data));
-       memcpy(resp_cc, ToSend, ToSendMax); resp_cc_len = ToSendMax;
+       // Configuration (block 1)
+       CodeIso15693AsTag(conf_data, sizeof(conf_data));
+       memcpy(resp_conf, ToSend, ToSendMax);
+       resp_conf_len = ToSendMax;
 
-       //This is used for responding to READ-block commands or other data which is dynamically generated
-       //First the 'trace'-data, not encoded for FPGA
-       uint8_t *data_generic_trace = BigBuf_malloc(8 + 2);//8 bytes data + 2byte CRC is max tag answer
-       //Then storage for the modulated data
-       //Each bit is doubled when modulated for FPGA, and we also have SOF and EOF (2 bytes)
-       uint8_t *data_response = BigBuf_malloc( (8+2) * 2 + 2);
+       // e-Purse (block 2)
+       CodeIso15693AsTag(card_challenge_data, sizeof(card_challenge_data));
+       memcpy(resp_cc, ToSend, ToSendMax);
+       resp_cc_len = ToSendMax;
 
-       // Start from off (no field generated)
-       //FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       //SpinDelay(200);
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
-       SpinDelay(100);
-       StartCountSspClk();
-       // We need to listen to the high-frequency, peak-detected path.
-       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-       FpgaSetupSsc(FPGA_MAJOR_MODE_HF_ISO14443A);
+       // Kd, Kc (blocks 3 and 4)
+       CodeIso15693AsTag(ff_data, sizeof(ff_data));
+       memcpy(resp_ff, ToSend, ToSendMax);
+       resp_ff_len = ToSendMax;
 
-       // To control where we are in the protocol
-       int cmdsRecvd = 0;
-       uint32_t time_0 = GetCountSspClk();
-       uint32_t t2r_time =0;
-       uint32_t r2t_time =0;
+       // Application Issuer Area (block 5)
+       CodeIso15693AsTag(aia_data, sizeof(aia_data));
+       memcpy(resp_aia, ToSend, ToSendMax);
+       resp_aia_len = ToSendMax;
+
+       //This is used for responding to READ-block commands or other data which is dynamically generated
+       uint8_t *data_generic_trace = BigBuf_malloc(32 + 2); // 32 bytes data + 2byte CRC is max tag answer
+       uint8_t *data_response = BigBuf_malloc( (32 + 2) * 2 + 2);
 
        LED_A_ON();
        bool buttonPressed = false;
-       uint8_t response_delay = 1;
+       enum { IDLE, ACTIVATED, SELECTED, HALTED } chip_state = IDLE;
+
        while (!exitLoop) {
-               response_delay = 1;
+               WDT_HIT();
                LED_B_OFF();
                //Signal tracer
                // Can be used to get a trigger for an oscilloscope..
                LED_C_OFF();
 
-               if (!GetIClassCommandFromReader(receivedCmd, &len, 100)) {
+               uint32_t reader_eof_time = 0;
+               len = GetIso15693CommandFromReader(receivedCmd, MAX_FRAME_SIZE, &reader_eof_time);
+               if (len < 0) {
                        buttonPressed = true;
                        break;
                }
-               r2t_time = GetCountSspClk();
+
                //Signal tracer
                LED_C_ON();
 
-               // Okay, look at the command now.
-               if (receivedCmd[0] == ICLASS_CMD_ACTALL) {
-                       // Reader in anticollission phase
-                       modulated_response = resp_sof;
-                       modulated_response_size = resp_sof_Len; //order = 1;
-                       trace_data = sof_data;
-                       trace_data_size = sizeof(sof_data);
-               } else if (receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 1) {
-                       // Reader asks for anticollission CSN
-                       modulated_response = resp_anticoll;
-                       modulated_response_size = resp_anticoll_len; //order = 2;
-                       trace_data = anticoll_data;
-                       trace_data_size = sizeof(anticoll_data);
-                       //DbpString("Reader requests anticollission CSN:");
-               } else if (receivedCmd[0] == ICLASS_CMD_SELECT) {
-                       // Reader selects anticollission CSN.
+               // Now look at the reader command and provide appropriate responses
+               // default is no response:
+               modulated_response = NULL;
+               modulated_response_size = 0;
+               trace_data = NULL;
+               trace_data_size = 0;
+
+               if (receivedCmd[0] == ICLASS_CMD_ACTALL && len == 1) {
+                       // Reader in anticollision phase
+                       if (chip_state != HALTED) {
+                               modulated_response = resp_sof;
+                               modulated_response_size = resp_sof_Len;
+                               trace_data = sof_data;
+                               trace_data_size = sizeof(sof_data);
+                               chip_state = ACTIVATED;
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 1) { // identify
+                       // Reader asks for anticollision CSN
+                       if (chip_state == SELECTED || chip_state == ACTIVATED) {
+                               modulated_response = resp_anticoll;
+                               modulated_response_size = resp_anticoll_len;
+                               trace_data = anticoll_data;
+                               trace_data_size = sizeof(anticoll_data);
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_SELECT && len == 9) {
+                       // Reader selects anticollision CSN.
                        // Tag sends the corresponding real CSN
-                       modulated_response = resp_csn;
-                       modulated_response_size = resp_csn_len; //order = 3;
-                       trace_data = csn_data;
-                       trace_data_size = sizeof(csn_data);
-                       //DbpString("Reader selects anticollission CSN:");
-               } else if (receivedCmd[0] == ICLASS_CMD_READCHECK_KD) {
-                       // Read e-purse (88 02)
-                       modulated_response = resp_cc;
-                       modulated_response_size = resp_cc_len; //order = 4;
-                       trace_data = card_challenge_data;
-                       trace_data_size = sizeof(card_challenge_data);
-                       LED_B_ON();
-               } else if (receivedCmd[0] == ICLASS_CMD_CHECK) {
+                       if (chip_state == ACTIVATED || chip_state == SELECTED) {
+                               if (!memcmp(receivedCmd+1, anticoll_data, 8)) {
+                                       modulated_response = resp_csn;
+                                       modulated_response_size = resp_csn_len;
+                                       trace_data = csn_data;
+                                       trace_data_size = sizeof(csn_data);
+                                       chip_state = SELECTED;
+                               } else {
+                                       chip_state = IDLE;
+                               }
+                       } else if (chip_state == HALTED) {
+                               // RESELECT with CSN
+                               if (!memcmp(receivedCmd+1, csn_data, 8)) {
+                                       modulated_response = resp_csn;
+                                       modulated_response_size = resp_csn_len;
+                                       trace_data = csn_data;
+                                       trace_data_size = sizeof(csn_data);
+                                       chip_state = SELECTED;
+                               }
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4) { // read block
+                       uint16_t blockNo = receivedCmd[1];
+                       if (chip_state == SELECTED) {
+                               if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {
+                                       // provide defaults for blocks 0 ... 5
+                                       switch (blockNo) {
+                                               case 0: // csn (block 00)
+                                                       modulated_response = resp_csn;
+                                                       modulated_response_size = resp_csn_len;
+                                                       trace_data = csn_data;
+                                                       trace_data_size = sizeof(csn_data);
+                                                       break;
+                                               case 1: // configuration (block 01)
+                                                       modulated_response = resp_conf;
+                                                       modulated_response_size = resp_conf_len;
+                                                       trace_data = conf_data;
+                                                       trace_data_size = sizeof(conf_data);
+                                                       break;
+                                               case 2: // e-purse (block 02)
+                                                       modulated_response = resp_cc;
+                                                       modulated_response_size = resp_cc_len;
+                                                       trace_data = card_challenge_data;
+                                                       trace_data_size = sizeof(card_challenge_data);
+                                                       // set epurse of sim2,4 attack
+                                                       if (reader_mac_buf != NULL) {
+                                                               memcpy(reader_mac_buf, card_challenge_data, 8);
+                                                       }
+                                                       break;
+                                               case 3:
+                                               case 4: // Kd, Kc, always respond with 0xff bytes
+                                                       modulated_response = resp_ff;
+                                                       modulated_response_size = resp_ff_len;
+                                                       trace_data = ff_data;
+                                                       trace_data_size = sizeof(ff_data);
+                                                       break;
+                                               case 5: // Application Issuer Area (block 05)
+                                                       modulated_response = resp_aia;
+                                                       modulated_response_size = resp_aia_len;
+                                                       trace_data = aia_data;
+                                                       trace_data_size = sizeof(aia_data);
+                                                       break;
+                                               // default: don't respond
+                                       }
+                               } else if (simulationMode == ICLASS_SIM_MODE_FULL) {
+                                       if (blockNo == 3 || blockNo == 4) { // Kd, Kc, always respond with 0xff bytes
+                                               modulated_response = resp_ff;
+                                               modulated_response_size = resp_ff_len;
+                                               trace_data = ff_data;
+                                               trace_data_size = sizeof(ff_data);
+                                       } else { // use data from emulator memory
+                                               memcpy(data_generic_trace, emulator + 8*blockNo, 8);
+                                               AppendCrc(data_generic_trace, 8);
+                                               trace_data = data_generic_trace;
+                                               trace_data_size = 10;
+                                               CodeIso15693AsTag(trace_data, trace_data_size);
+                                               memcpy(data_response, ToSend, ToSendMax);
+                                               modulated_response = data_response;
+                                               modulated_response_size = ToSendMax;
+                                       }
+                               }
+                       }
+
+               } else if ((receivedCmd[0] == ICLASS_CMD_READCHECK_KD
+                                       || receivedCmd[0] == ICLASS_CMD_READCHECK_KC) && len == 2) {
+                       // Read e-purse (88 02 || 18 02)
+                       if (chip_state == SELECTED) {
+                               modulated_response = resp_cc;
+                               modulated_response_size = resp_cc_len;
+                               trace_data = card_challenge_data;
+                               trace_data_size = sizeof(card_challenge_data);
+                               LED_B_ON();
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_CHECK && len == 9) {
                        // Reader random and reader MAC!!!
-                       if (simulationMode == MODE_FULLSIM) {
-                               //NR, from reader, is in receivedCmd +1
-                               opt_doTagMAC_2(cipher_state, receivedCmd+1, data_generic_trace, diversified_key);
+                       if (chip_state == SELECTED) {
+                               if (simulationMode == ICLASS_SIM_MODE_FULL) {
+                                       //NR, from reader, is in receivedCmd+1
+                                       opt_doTagMAC_2(cipher_state, receivedCmd+1, data_generic_trace, diversified_key);
+                                       trace_data = data_generic_trace;
+                                       trace_data_size = 4;
+                                       CodeIso15693AsTag(trace_data, trace_data_size);
+                                       memcpy(data_response, ToSend, ToSendMax);
+                                       modulated_response = data_response;
+                                       modulated_response_size = ToSendMax;
+                                       //exitLoop = true;
+                               } else { // Not fullsim, we don't respond
+                                       // We do not know what to answer, so lets keep quiet
+                                       if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {
+                                               if (reader_mac_buf != NULL) {
+                                                       // save NR and MAC for sim 2,4
+                                                       memcpy(reader_mac_buf + 8, receivedCmd + 1, 8);
+                                               }
+                                               exitLoop = true;
+                                       }
+                               }
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {
+                       if (chip_state == SELECTED) {
+                               // Reader ends the session
+                               chip_state = HALTED;
+                       }
 
+               } else if (simulationMode == ICLASS_SIM_MODE_FULL && receivedCmd[0] == ICLASS_CMD_READ4 && len == 4) {  // 0x06
+                       //Read 4 blocks
+                       if (chip_state == SELECTED) {
+                               memcpy(data_generic_trace, emulator + (receivedCmd[1] << 3), 8 * 4);
+                               AppendCrc(data_generic_trace, 8 * 4);
                                trace_data = data_generic_trace;
-                               trace_data_size = 4;
-                               CodeIClassTagAnswer(trace_data, trace_data_size);
+                               trace_data_size = 8 * 4 + 2;
+                               CodeIso15693AsTag(trace_data, trace_data_size);
                                memcpy(data_response, ToSend, ToSendMax);
                                modulated_response = data_response;
                                modulated_response_size = ToSendMax;
-                               response_delay = 0; //We need to hurry here... (but maybe not too much... ??)
-                               //exitLoop = true;
-                       } else {    //Not fullsim, we don't respond
-                               // We do not know what to answer, so lets keep quiet
-                               modulated_response = resp_sof;
-                               modulated_response_size = 0;
-                               trace_data = NULL;
-                               trace_data_size = 0;
-                               if (simulationMode == MODE_EXIT_AFTER_MAC) {
-                                       // dbprintf:ing ...
-                                       Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x"
-                                                          ,csn[0],csn[1],csn[2],csn[3],csn[4],csn[5],csn[6],csn[7]);
-                                       Dbprintf("RDR:  (len=%02d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",len,
-                                                       receivedCmd[0], receivedCmd[1], receivedCmd[2],
-                                                       receivedCmd[3], receivedCmd[4], receivedCmd[5],
-                                                       receivedCmd[6], receivedCmd[7], receivedCmd[8]);
-                                       if (reader_mac_buf != NULL) {
-                                               memcpy(reader_mac_buf, receivedCmd+1, 8);
-                                       }
-                                       exitLoop = true;
-                               }
                        }
 
-               } else if (receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {
-                       // Reader ends the session
-                       modulated_response = resp_sof;
-                       modulated_response_size = 0; //order = 0;
-                       trace_data = NULL;
-                       trace_data_size = 0;
-               } else if (simulationMode == MODE_FULLSIM && receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4) {
-                       //Read block
-                       uint16_t blk = receivedCmd[1];
-                       //Take the data...
-                       memcpy(data_generic_trace, emulator + (blk << 3), 8);
-                       //Add crc
-                       AppendCrc(data_generic_trace, 8);
-                       trace_data = data_generic_trace;
-                       trace_data_size = 10;
-                       CodeIClassTagAnswer(trace_data, trace_data_size);
-                       memcpy(data_response, ToSend, ToSendMax);
-                       modulated_response = data_response;
-                       modulated_response_size = ToSendMax;
-               } else if (receivedCmd[0] == ICLASS_CMD_UPDATE && simulationMode == MODE_FULLSIM) {
-                       //Probably the reader wants to update the nonce. Let's just ignore that for now.
+               } else if (receivedCmd[0] == ICLASS_CMD_UPDATE && (len == 12 || len == 14)) {
+                       // Probably the reader wants to update the nonce. Let's just ignore that for now.
                        // OBS! If this is implemented, don't forget to regenerate the cipher_state
-                       //We're expected to respond with the data+crc, exactly what's already in the receivedcmd
-                       //receivedcmd is now UPDATE 1b | ADDRESS 1b| DATA 8b| Signature 4b or CRC 2b|
-
-                       //Take the data...
-                       memcpy(data_generic_trace, receivedCmd+2, 8);
-                       //Add crc
-                       AppendCrc(data_generic_trace, 8);
-                       trace_data = data_generic_trace;
-                       trace_data_size = 10;
-                       CodeIClassTagAnswer(trace_data, trace_data_size);
-                       memcpy(data_response, ToSend, ToSendMax);
-                       modulated_response = data_response;
-                       modulated_response_size = ToSendMax;
-               } else if (receivedCmd[0] == ICLASS_CMD_PAGESEL) {
-                       //Pagesel
-                       //Pagesel enables to select a page in the selected chip memory and return its configuration block
-                       //Chips with a single page will not answer to this command
-                       // It appears we're fine ignoring this.
-                       //Otherwise, we should answer 8bytes (block) + 2bytes CRC
+                       // We're expected to respond with the data+crc, exactly what's already in the receivedCmd
+                       // receivedCmd is now UPDATE 1b | ADDRESS 1b | DATA 8b | Signature 4b or CRC 2b
+                       if (chip_state == SELECTED) {
+                               memcpy(data_generic_trace, receivedCmd + 2, 8);
+                               AppendCrc(data_generic_trace, 8);
+                               trace_data = data_generic_trace;
+                               trace_data_size = 10;
+                               CodeIso15693AsTag(trace_data, trace_data_size);
+                               memcpy(data_response, ToSend, ToSendMax);
+                               modulated_response = data_response;
+                               modulated_response_size = ToSendMax;
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_PAGESEL && len == 4) {
+                       // Pagesel
+                       if (chip_state == SELECTED) {
+                               // Pagesel enables to select a page in the selected chip memory and return its configuration block
+                               // Chips with a single page will not answer to this command
+                               // It appears we're fine ignoring this.
+                               // Otherwise, we should answer 8bytes (block) + 2bytes CRC
+                       }
+
+               } else if (receivedCmd[0] == 0x26 && len == 5) {
+                       // standard ISO15693 INVENTORY command. Ignore.
+
                } else {
-                       //#db# Unknown command received from reader (len=5): 26 1 0 f6 a 44 44 44 44
-                       // 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]);
+                       // don't know how to handle this command
+                       char debug_message[250]; // should be enough
+                       sprintf(debug_message, "Unhandled command (len = %d) received from reader:", len);
+                       for (int i = 0; i < len && strlen(debug_message) < sizeof(debug_message) - 3 - 1; i++) {
+                               sprintf(debug_message + strlen(debug_message), " %02x", receivedCmd[i]);
+                       }
+                       Dbprintf("%s", debug_message);
                        // Do not respond
-                       modulated_response = resp_sof;
-                       modulated_response_size = 0; //order = 0;
-                       trace_data = NULL;
-                       trace_data_size = 0;
                }
 
-               if (cmdsRecvd >  100) {
-                       //DbpString("100 commands later...");
-                       //break;
-               } else {
-                       cmdsRecvd++;
-               }
                /**
-               A legit tag has about 380us delay between reader EOT and tag SOF.
+               A legit tag has about 311,5us delay between reader EOT and tag SOF.
                **/
                if (modulated_response_size > 0) {
-                       SendIClassAnswer(modulated_response, modulated_response_size, response_delay);
-                       t2r_time = GetCountSspClk();
+                       uint32_t response_time = reader_eof_time + DELAY_ISO15693_VCD_TO_VICC_SIM - DELAY_ARM_TO_READER_SIM;
+                       TransmitTo15693Reader(modulated_response, modulated_response_size, response_time, false);
+                       LogTrace(trace_data, trace_data_size, response_time + DELAY_ARM_TO_READER_SIM, response_time + (modulated_response_size << 6) + DELAY_ARM_TO_READER_SIM, NULL, false);
                }
 
-               uint8_t parity[MAX_PARITY_SIZE];
-               GetParity(receivedCmd, len, parity);
-               LogTrace(receivedCmd, len, (r2t_time-time_0) << 4, (r2t_time-time_0) << 4, parity, true);
-
-               if (trace_data != NULL) {
-                       GetParity(trace_data, trace_data_size, parity);
-                       LogTrace(trace_data, trace_data_size, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, false);
-               }
-               if (!get_tracing()) {
-                       DbpString("Trace full");
-                       //break;
-               }
        }
 
-       //Dbprintf("%x", cmdsRecvd);
        LED_A_OFF();
        LED_B_OFF();
        LED_C_OFF();
@@ -1280,7 +1179,13 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain) {
        uint32_t simType = arg0;
        uint32_t numberOfCSNS = arg1;
+
+       // setup hardware for simulation:
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+       SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION);
+       FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR);
+       StartCountSspClk();
 
        // Enable and clear the trace
        set_tracing(true);
@@ -1288,35 +1193,42 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
        //Use the emulator memory for SIM
        uint8_t *emulator = BigBuf_get_EM_addr();
 
-       if (simType == 0) {
+       if (simType == ICLASS_SIM_MODE_CSN) {
                // Use the CSN from commandline
                memcpy(emulator, datain, 8);
-               doIClassSimulation(MODE_SIM_CSN,NULL);
-       } else if (simType == 1) {
+               doIClassSimulation(ICLASS_SIM_MODE_CSN, NULL);
+       } else if (simType == ICLASS_SIM_MODE_CSN_DEFAULT) {
                //Default CSN
                uint8_t csn_crc[] = { 0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0, 0x00, 0x00 };
                // Use the CSN from commandline
                memcpy(emulator, csn_crc, 8);
-               doIClassSimulation(MODE_SIM_CSN,NULL);
-       } else if (simType == 2) {
+               doIClassSimulation(ICLASS_SIM_MODE_CSN, NULL);
+       } else if (simType == ICLASS_SIM_MODE_READER_ATTACK) {
                uint8_t mac_responses[USB_CMD_DATA_SIZE] = { 0 };
                Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);
                // In this mode, a number of csns are within datain. We'll simulate each one, one at a time
-               // in order to collect MAC's from the reader. This can later be used in an offlne-attack
+               // in order to collect MAC's from the reader. This can later be used in an offline-attack
                // in order to obtain the keys, as in the "dismantling iclass"-paper.
-               int i = 0;
-               for ( ; i < numberOfCSNS && i*8+8 < USB_CMD_DATA_SIZE; i++) {
-                       // The usb data is 512 bytes, fitting 65 8-byte CSNs in there.
+               int i;
+               for (i = 0; i < numberOfCSNS && i*16+16 <= USB_CMD_DATA_SIZE; i++) {
+                       // The usb data is 512 bytes, fitting 32 responses (8 byte CC + 4 Byte NR + 4 Byte MAC = 16 Byte response).
                        memcpy(emulator, datain+(i*8), 8);
-                       if (doIClassSimulation(MODE_EXIT_AFTER_MAC,mac_responses+i*8)) {
-                               cmd_send(CMD_ACK, CMD_SIMULATE_TAG_ICLASS, i, 0, mac_responses, i*8);
-                               return; // Button pressed
+                       if (doIClassSimulation(ICLASS_SIM_MODE_EXIT_AFTER_MAC, mac_responses+i*16)) {
+                                // Button pressed
+                                break;
                        }
+                       Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x",
+                                       datain[i*8+0], datain[i*8+1], datain[i*8+2], datain[i*8+3],
+                                       datain[i*8+4], datain[i*8+5], datain[i*8+6], datain[i*8+7]);
+                       Dbprintf("NR,MAC: %02x %02x %02x %02x %02x %02x %02x %02x",
+                                       mac_responses[i*16+ 8], mac_responses[i*16+ 9], mac_responses[i*16+10], mac_responses[i*16+11],
+                                       mac_responses[i*16+12], mac_responses[i*16+13], mac_responses[i*16+14], mac_responses[i*16+15]);
+                       SpinDelay(100); // give the reader some time to prepare for next CSN
                }
-               cmd_send(CMD_ACK, CMD_SIMULATE_TAG_ICLASS, i, 0, mac_responses, i*8);
-       } else if (simType == 3) {
+               cmd_send(CMD_ACK, CMD_SIMULATE_TAG_ICLASS, i, 0, mac_responses, i*16);
+       } else if (simType == ICLASS_SIM_MODE_FULL) {
                //This is 'full sim' mode, where we use the emulator storage for data.
-               doIClassSimulation(MODE_FULLSIM, NULL);
+               doIClassSimulation(ICLASS_SIM_MODE_FULL, NULL);
        } else {
                // We may want a mode here where we hardcode the csns to use (from proxclone).
                // That will speed things up a little, but not required just yet.
@@ -1479,10 +1391,10 @@ static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples,
                        if (elapsed) (*elapsed)++;
                }
                if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-                       if (c < timeout) { 
-                               c++; 
-                       } else { 
-                               return false; 
+                       if (c < timeout) {
+                               c++;
+                       } else {
+                               return false;
                        }
                        b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
                        skip = !skip;
@@ -1683,10 +1595,10 @@ void ReaderIClass(uint8_t arg0) {
                // 0 : CSN
                // 1 : Configuration
                // 2 : e-purse
-               // (3,4 write-only, kc and kd)
-               // 5 Application issuer area
-               //
-               //Then we can 'ship' back the 8 * 6 bytes of data,
+               // 3 : kd / debit / aa2 (write-only)
+               // 4 : kc / credit / aa1 (write-only)
+               // 5 : AIA, Application issuer area
+               //Then we can 'ship' back the 6 * 8 bytes of data,
                // with 0xFF:s in block 3 and 4.
 
                LED_B_ON();
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