Update README.md

[proxmark3-svn] / armsrc / iclass.c

diff --git a/armsrc/iclass.c b/armsrc/iclass.c
index 5b6dcc58e68c21dedfab37f085b87af360914fcd..3f89ae854b4fe1c904749728f0d3298905280b34 100644 (file)
--- a/armsrc/iclass.c
+++ b/armsrc/iclass.c
@@ -2,6 +2,8 @@
 // Gerhard de Koning Gans - May 2008
 // Hagen Fritsch - June 2010
 // Gerhard de Koning Gans - May 2011
 // Gerhard de Koning Gans - May 2008
 // Hagen Fritsch - June 2010
 // Gerhard de Koning Gans - May 2011

+// Gerhard de Koning Gans - June 2012 - Added iClass card and reader emulation
+// piwi - 2019

 //
 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
 // at your option, any later version. See the LICENSE.txt file for the text of
 //
 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
 // at your option, any later version. See the LICENSE.txt file for the text of


@@ -9,914 +11,918 @@
 //-----------------------------------------------------------------------------
 // Routines to support iClass.
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 // Routines to support iClass.
 //-----------------------------------------------------------------------------

-// Based on ISO14443a implementation. Still in experimental phase.

 // Contribution made during a security research at Radboud University Nijmegen
 // Contribution made during a security research at Radboud University Nijmegen

-// 
-// Please feel free to contribute and extend iClass support!!
-//-----------------------------------------------------------------------------
-//
-// TODO:
-// =====
-// - iClass emulation
-// - reader emulation
-//
-// FIX:
-// ====
-// We still have sometimes a demodulation error when snooping iClass communication.
-// The resulting trace of a read-block-03 command may look something like this:
-//
-//  +  22279:    :     0c  03  e8  01    
-//
-//    ...with an incorrect answer...
-//
-//  +     85:   0: TAG ff! ff! ff! ff! ff! ff! ff! ff! bb  33  bb  00  01! 0e! 04! bb     !crc
-//
-// We still left the error signalling bytes in the traces like 0xbb
-//
-// A correct trace should look like this:
-//
-// +  21112:    :     0c  03  e8  01    
-// +     85:   0: TAG ff  ff  ff  ff  ff  ff  ff  ff  ea  f5    

 //
 //

+// Please feel free to contribute and extend iClass support!!

 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------
 

+#include "iclass.h"
+

 #include "proxmark3.h"
 #include "apps.h"
 #include "util.h"
 #include "string.h"
 #include "proxmark3.h"
 #include "apps.h"
 #include "util.h"
 #include "string.h"

+#include "printf.h"

 #include "common.h"
 #include "common.h"

+#include "usb_cdc.h"
+#include "iso14443a.h"
+#include "iso15693.h"
+// Needed for CRC in emulation mode;
+// same construction as in ISO 14443;
+// different initial value (CRC_ICLASS)
+#include "iso14443crc.h"
+#include "iso15693tools.h"
+#include "protocols.h"
+#include "optimized_cipher.h"
+#include "fpgaloader.h"
+
+// iCLASS has a slightly different timing compared to ISO15693. According to the picopass data sheet the tag response is expected 330us after
+// the reader command. This is measured from end of reader EOF to first modulation of the tag's SOF which starts with a 56,64us unmodulated period.
+// 330us = 140 ssp_clk cycles @ 423,75kHz when simulating.
+// 56,64us = 24 ssp_clk_cycles
+#define DELAY_ICLASS_VCD_TO_VICC_SIM     (140 - 24)
+// times in ssp_clk_cycles @ 3,3625MHz when acting as reader
+#define DELAY_ICLASS_VICC_TO_VCD_READER  DELAY_ISO15693_VICC_TO_VCD_READER
+// times in samples @ 212kHz when acting as reader
+#define ICLASS_READER_TIMEOUT_ACTALL     330 // 1558us, nominal 330us + 7slots*160us = 1450us
+#define ICLASS_READER_TIMEOUT_UPDATE    3390 // 16000us, nominal 4-15ms
+#define ICLASS_READER_TIMEOUT_OTHERS      80 // 380us, nominal 330us
+
+#define ICLASS_BUFFER_SIZE 34                // we expect max 34 bytes as tag answer (response to READ4)

 
 

-static uint8_t *trace = (uint8_t *) BigBuf;
-static int traceLen = 0;
-static int rsamples = 0;
-
-// CARD TO READER
-// 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
-// Sequence X: 00001100 drop after half a period
-// Sequence Y: 00000000 no drop
-// Sequence Z: 11000000 drop at start
-#define        SEC_D 0xf0
-#define        SEC_E 0x0f
-#define        SEC_F 0x00
-#define        SEC_X 0x0c
-#define        SEC_Y 0x00
-#define        SEC_Z 0xc0
-
-static 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,
-  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,
-  1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
-  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,
-  1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
-  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,
-  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,
-  1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1
-};
-
-//static const uint8_t MajorityNibble[16] = { 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 1 };
-//static const uint8_t MajorityNibble[16] =   { 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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

 
 

+//=============================================================================
+// A `sniffer' for iClass communication
+// Both sides of communication!
+//=============================================================================
+void SnoopIClass(uint8_t jam_search_len, uint8_t *jam_search_string) {
+       SnoopIso15693(jam_search_len, jam_search_string);
+}

 
 

-//-----------------------------------------------------------------------------
-// The software UART that receives commands from the reader, and its state
-// variables.
-//-----------------------------------------------------------------------------
-static struct {
-    enum {
-        STATE_UNSYNCD,
-        STATE_START_OF_COMMUNICATION,
-       STATE_RECEIVING
-    }       state;
-    uint16_t    shiftReg;
-    int     bitCnt;
-    int     byteCnt;
-    int     byteCntMax;
-    int     posCnt;
-    int     nOutOfCnt;
-    int     OutOfCnt;
-    int     syncBit;
-       int     parityBits;
-       int     samples;
-    int     highCnt;
-    int     swapper;
-    int     counter;
-    int     bitBuffer;
-    int     dropPosition;
-    uint8_t   *output;
-} Uart;
-
-static RAMFUNC int MillerDecoding(int bit)
-{
-       int error = 0;
-       int bitright;
-
-       if(!Uart.bitBuffer) {
-               Uart.bitBuffer = bit ^ 0xFF0;
-               return FALSE;
+
+void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
+       int i;
+       for (i = 0; i < 8; i++) {
+               rotatedCSN[i] = (originalCSN[i] >> 3) | (originalCSN[(i+1)%8] << 5);

        }
        }

-       else {
-               Uart.bitBuffer <<= 4;
-               Uart.bitBuffer ^= bit;
+}
+
+
+// Encode SOF only
+static void CodeIClassTagSOF() {
+       ToSendReset();
+       ToSend[++ToSendMax] = 0x1D;
+       ToSendMax++;
+}
+
+
+static void AppendCrc(uint8_t *data, int len) {
+       ComputeCrc14443(CRC_ICLASS, data, len, data+len, data+len+1);
+}
+
+
+/**
+ * @brief Does the actual simulation
+ */
+int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
+
+       // free eventually allocated BigBuf memory
+       BigBuf_free_keep_EM();
+
+       uint16_t page_size = 32 * 8;
+       uint8_t current_page = 0;
+
+       // maintain cipher states for both credit and debit key for each page
+       State cipher_state_KC[8];
+       State cipher_state_KD[8];
+       State *cipher_state = &cipher_state_KD[0];
+
+       uint8_t *emulator = BigBuf_get_EM_addr();
+       uint8_t *csn = emulator;
+
+       // CSN followed by two CRC bytes
+       uint8_t anticoll_data[10];
+       uint8_t csn_data[10];
+       memcpy(csn_data, csn, sizeof(csn_data));
+       Dbprintf("Simulating 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]);
+
+       // Construct anticollision-CSN
+       rotateCSN(csn_data, anticoll_data);
+
+       // Compute CRC on both CSNs
+       AppendCrc(anticoll_data, 8);
+       AppendCrc(csn_data, 8);
+
+       uint8_t diversified_key_d[8] = { 0x00 };
+       uint8_t diversified_key_c[8] = { 0x00 };
+       uint8_t *diversified_key = diversified_key_d;
+
+       // configuration block
+       uint8_t conf_block[10] = {0x12, 0xFF, 0xFF, 0xFF, 0x7F, 0x1F, 0xFF, 0x3C, 0x00, 0x00};
+
+       // e-Purse
+       uint8_t card_challenge_data[8] = { 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+       if (simulationMode == ICLASS_SIM_MODE_FULL) {
+               // initialize from page 0
+               memcpy(conf_block, emulator + 8 * 1, 8);
+               memcpy(card_challenge_data, emulator + 8 * 2, 8); // e-purse
+               memcpy(diversified_key_d, emulator + 8 * 3, 8);   // Kd
+               memcpy(diversified_key_c, emulator + 8 * 4, 8);   // Kc

        }
        }

-       
-       /*if(Uart.swapper) {
-               Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;
-               Uart.byteCnt++;
-               Uart.swapper = 0;
-               if(Uart.byteCnt > 15) { return TRUE; }
+
+       AppendCrc(conf_block, 8);
+
+       // save card challenge for sim2,4 attack
+       if (reader_mac_buf != NULL) {
+               memcpy(reader_mac_buf, card_challenge_data, 8);

        }
        }

-       else {
-               Uart.swapper = 1;
-       }*/

 
 

-       if(Uart.state != STATE_UNSYNCD) {
-               Uart.posCnt++;
+       if (conf_block[5] & 0x80) {
+               page_size = 256 * 8;
+       }

 
 

-               if((Uart.bitBuffer & Uart.syncBit) ^ Uart.syncBit) {
-                       bit = 0x00;
+       // From PicoPass DS:
+       // When the page is in personalization mode this bit is equal to 1.
+       // Once the application issuer has personalized and coded its dedicated areas, this bit must be set to 0:
+       // the page is then "in application mode".
+       bool personalization_mode = conf_block[7] & 0x80;
+
+       // chip memory may be divided in 8 pages
+       uint8_t max_page = conf_block[4] & 0x10 ? 0 : 7;
+
+       // Precalculate the cipher states, feeding it the CC
+       cipher_state_KD[0] = opt_doTagMAC_1(card_challenge_data, diversified_key_d);
+       cipher_state_KC[0] = opt_doTagMAC_1(card_challenge_data, diversified_key_c);
+       if (simulationMode == ICLASS_SIM_MODE_FULL) {
+               for (int i = 1; i < max_page; i++) {
+                       uint8_t *epurse = emulator + i*page_size + 8*2;
+                       uint8_t *Kd = emulator + i*page_size + 8*3;
+                       uint8_t *Kc = emulator + i*page_size + 8*4;
+                       cipher_state_KD[i] = opt_doTagMAC_1(epurse, Kd);
+                       cipher_state_KC[i] = opt_doTagMAC_1(epurse, Kc);

                }
                }

-               else {
-                       bit = 0x01;
-               }
-               if(((Uart.bitBuffer << 1) & Uart.syncBit) ^ Uart.syncBit) {
-                       bitright = 0x00;
-               }
-               else {
-                       bitright = 0x01;
+       }
+
+       int exitLoop = 0;
+       // Reader 0a
+       // Tag    0f
+       // Reader 0c
+       // Tag    anticoll. CSN
+       // Reader 81 anticoll. CSN
+       // Tag    CSN
+
+       uint8_t *modulated_response;
+       int modulated_response_size = 0;
+       uint8_t *trace_data = NULL;
+       int trace_data_size = 0;
+
+       // Respond SOF -- takes 1 bytes
+       uint8_t *resp_sof = BigBuf_malloc(1);
+       int resp_sof_Len;
+
+       // 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(22);
+       int resp_anticoll_len;
+
+       // CSN (block 0)
+       // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)
+       uint8_t *resp_csn = BigBuf_malloc(22);
+       int resp_csn_len;
+
+       // configuration (block 1) picopass 2ks
+       uint8_t *resp_conf = BigBuf_malloc(22);
+       int resp_conf_len;
+
+       // 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(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
+
+       // First card answer: SOF only
+       CodeIClassTagSOF();
+       memcpy(resp_sof, ToSend, ToSendMax);
+       resp_sof_Len = ToSendMax;
+
+       // Anticollision CSN
+       CodeIso15693AsTag(anticoll_data, sizeof(anticoll_data));
+       memcpy(resp_anticoll, ToSend, ToSendMax);
+       resp_anticoll_len = ToSendMax;
+
+       // CSN (block 0)
+       CodeIso15693AsTag(csn_data, sizeof(csn_data));
+       memcpy(resp_csn, ToSend, ToSendMax);
+       resp_csn_len = ToSendMax;
+
+       // Configuration (block 1)
+       CodeIso15693AsTag(conf_block, sizeof(conf_block));
+       memcpy(resp_conf, ToSend, ToSendMax);
+       resp_conf_len = ToSendMax;
+
+       // e-Purse (block 2)
+       CodeIso15693AsTag(card_challenge_data, sizeof(card_challenge_data));
+       memcpy(resp_cc, ToSend, ToSendMax);
+       resp_cc_len = ToSendMax;
+
+       // Kd, Kc (blocks 3 and 4)
+       CodeIso15693AsTag(ff_data, sizeof(ff_data));
+       memcpy(resp_ff, ToSend, ToSendMax);
+       resp_ff_len = ToSendMax;
+
+       // 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);
+
+       bool buttonPressed = false;
+       enum { IDLE, ACTIVATED, SELECTED, HALTED } chip_state = IDLE;
+
+       while (!exitLoop) {
+               WDT_HIT();
+
+               uint32_t reader_eof_time = 0;
+               len = GetIso15693CommandFromReader(receivedCmd, MAX_FRAME_SIZE, &reader_eof_time);
+               if (len < 0) {
+                       buttonPressed = true;
+                       break;

                }
                }

-               if(bit != bitright) { bit = bitright; }
-
-               
-               // So, now we only have to deal with *bit*, lets see...
-               if(Uart.posCnt == 1) {
-                       // measurement first half bitperiod
-                       if(!bit) {
-                               // Drop in first half means that we are either seeing
-                               // an SOF or an EOF.
-
-                               if(Uart.nOutOfCnt == 1) {
-                                       // End of Communication
-                                       Uart.state = STATE_UNSYNCD;
-                                       Uart.highCnt = 0;
-                                       if(Uart.byteCnt == 0) {
-                                               // Its not straightforward to show single EOFs
-                                               // So just leave it and do not return TRUE
-                                               Uart.output[Uart.byteCnt] = 0xf0;
-                                               Uart.byteCnt++;
-
-                                               // Calculate the parity bit for the client...
-                                               Uart.parityBits = 1;
-                                       }
-                                       else {
-                                               return TRUE;
-                                       }
+
+               // 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;
+                               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
+                       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(Uart.state != STATE_START_OF_COMMUNICATION) {
-                                       // When not part of SOF or EOF, it is an error
-                                       Uart.state = STATE_UNSYNCD;
-                                       Uart.highCnt = 0;
-                                       error = 4;
+                       } 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 {
-                       // measurement second half bitperiod
-                       // Count the bitslot we are in... (ISO 15693)
-                       Uart.nOutOfCnt++;
-                       
-                       if(!bit) {
-                               if(Uart.dropPosition) {
-                                       if(Uart.state == STATE_START_OF_COMMUNICATION) {
-                                               error = 1;
+
+               } 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_block;
+                                                       trace_data_size = sizeof(conf_block);
+                                                       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 {
-                                               error = 7;
+                               } 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 + current_page*page_size + 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;

                                        }
                                        }

-                                       // It is an error if we already have seen a drop in current frame
-                                       Uart.state = STATE_UNSYNCD;
-                                       Uart.highCnt = 0;
-                               }
-                               else {
-                                       Uart.dropPosition = Uart.nOutOfCnt;

                                }
                        }
 
                                }
                        }
 

-                       Uart.posCnt = 0;
+               } else if ((receivedCmd[0] == ICLASS_CMD_READCHECK_KD
+                                       || receivedCmd[0] == ICLASS_CMD_READCHECK_KC) && receivedCmd[1] == 0x02 && len == 2) {
+                       // Read e-purse (88 02 || 18 02)
+                       if (chip_state == SELECTED) {
+                               if(receivedCmd[0] == ICLASS_CMD_READCHECK_KD){
+                                       cipher_state = &cipher_state_KD[current_page];
+                                       diversified_key = diversified_key_d;
+                               } else {
+                                       cipher_state = &cipher_state_KC[current_page];
+                                       diversified_key = diversified_key_c;
+                               }
+                               modulated_response = resp_cc;
+                               modulated_response_size = resp_cc_len;
+                               trace_data = card_challenge_data;
+                               trace_data_size = sizeof(card_challenge_data);
+                       }

 
 

-                       
-                       if(Uart.nOutOfCnt == Uart.OutOfCnt && Uart.OutOfCnt == 4) {
-                               Uart.nOutOfCnt = 0;
-                               
-                               if(Uart.state == STATE_START_OF_COMMUNICATION) {
-                                       if(Uart.dropPosition == 4) {
-                                               Uart.state = STATE_RECEIVING;
-                                               Uart.OutOfCnt = 256;
+               } else if ((receivedCmd[0] == ICLASS_CMD_CHECK_KC
+                                       || receivedCmd[0] == ICLASS_CMD_CHECK_KD) && len == 9) {
+                       // Reader random and reader MAC!!!
+                       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(Uart.dropPosition == 3) {
-                                               Uart.state = STATE_RECEIVING;
-                                               Uart.OutOfCnt = 4;
-                                               //Uart.output[Uart.byteCnt] = 0xdd;
-                                               //Uart.byteCnt++;
+                               }
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {
+                       if (chip_state == SELECTED) {
+                               // Reader ends the session
+                               modulated_response = resp_sof;
+                               modulated_response_size = resp_sof_Len;
+                               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) {
+                               uint8_t blockNo = receivedCmd[1];
+                               memcpy(data_generic_trace, emulator + current_page*page_size + blockNo*8, 8 * 4);
+                               AppendCrc(data_generic_trace, 8 * 4);
+                               trace_data = data_generic_trace;
+                               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;
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_UPDATE && (len == 12 || len == 14)) {
+                       // 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) {
+                               uint8_t blockNo = receivedCmd[1];
+                               if (blockNo == 2) { // update e-purse
+                                       memcpy(card_challenge_data, receivedCmd+2, 8);
+                                       CodeIso15693AsTag(card_challenge_data, sizeof(card_challenge_data));
+                                       memcpy(resp_cc, ToSend, ToSendMax);
+                                       resp_cc_len = ToSendMax;
+                                       cipher_state_KD[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_d);
+                                       cipher_state_KC[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_c);
+                                       if (simulationMode == ICLASS_SIM_MODE_FULL) {
+                                               memcpy(emulator + current_page*page_size + 8*2, card_challenge_data, 8);

                                        }
                                        }

-                                       else {
-                                               Uart.state = STATE_UNSYNCD;
-                                               Uart.highCnt = 0;
+                               } else if (blockNo == 3) { // update Kd
+                                       for (int i = 0; i < 8; i++) {
+                                               if (personalization_mode) {
+                                                       diversified_key_d[i] = receivedCmd[2 + i];
+                                               } else {
+                                                       diversified_key_d[i] ^= receivedCmd[2 + i];
+                                               }

                                        }
                                        }

-                                       Uart.dropPosition = 0;
-                               }
-                               else {
-                                       // RECEIVING DATA
-                                       // 1 out of 4
-                                       if(!Uart.dropPosition) {
-                                               Uart.state = STATE_UNSYNCD;
-                                               Uart.highCnt = 0;
-                                               error = 9;
+                                       cipher_state_KD[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_d);
+                                       if (simulationMode == ICLASS_SIM_MODE_FULL) {
+                                               memcpy(emulator + current_page*page_size + 8*3, diversified_key_d, 8);

                                        }
                                        }

-                                       else {
-                                               Uart.shiftReg >>= 2;
-                                               
-                                               // Swap bit order
-                                               Uart.dropPosition--;
-                                               //if(Uart.dropPosition == 1) { Uart.dropPosition = 2; }
-                                               //else if(Uart.dropPosition == 2) { Uart.dropPosition = 1; }
-                                               
-                                               Uart.shiftReg ^= ((Uart.dropPosition & 0x03) << 6);
-                                               Uart.bitCnt += 2;
-                                               Uart.dropPosition = 0;
-
-                                               if(Uart.bitCnt == 8) {
-                                                       Uart.output[Uart.byteCnt] = (Uart.shiftReg & 0xff);
-                                                       Uart.byteCnt++;
-
-                                                       // Calculate the parity bit for the client...
-                                                       Uart.parityBits <<= 1;
-                                                       Uart.parityBits ^= OddByteParity[(Uart.shiftReg & 0xff)];
-
-                                                       Uart.bitCnt = 0;
-                                                       Uart.shiftReg = 0;
+                               } else if (blockNo == 4) { // update Kc
+                                       for (int i = 0; i < 8; i++) {
+                                               if (personalization_mode) {
+                                                       diversified_key_c[i] = receivedCmd[2 + i];
+                                               } else {
+                                                       diversified_key_c[i] ^= receivedCmd[2 + i];

                                                }
                                        }
                                                }
                                        }

+                                       cipher_state_KC[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_c);
+                                       if (simulationMode == ICLASS_SIM_MODE_FULL) {
+                                               memcpy(emulator + current_page*page_size + 8*4, diversified_key_c, 8);
+                                       }
+                               } else if (simulationMode == ICLASS_SIM_MODE_FULL) { // update any other data block
+                                               memcpy(emulator + current_page*page_size + 8*blockNo, receivedCmd+2, 8);

                                }
                                }

+                               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(Uart.nOutOfCnt == Uart.OutOfCnt) {
-                               // RECEIVING DATA
-                               // 1 out of 256
-                               if(!Uart.dropPosition) {
-                                       Uart.state = STATE_UNSYNCD;
-                                       Uart.highCnt = 0;
-                                       error = 3;
-                               }
-                               else {
-                                       Uart.dropPosition--;
-                                       Uart.output[Uart.byteCnt] = (Uart.dropPosition & 0xff);
-                                       Uart.byteCnt++;
-
-                                       // Calculate the parity bit for the client...
-                                       Uart.parityBits <<= 1;
-                                       Uart.parityBits ^= OddByteParity[(Uart.dropPosition & 0xff)];
-
-                                       Uart.bitCnt = 0;
-                                       Uart.shiftReg = 0;
-                                       Uart.nOutOfCnt = 0;
-                                       Uart.dropPosition = 0;
+
+               } else if (receivedCmd[0] == ICLASS_CMD_PAGESEL && len == 4) {
+                       // Pagesel
+                       // Chips with a single page will not answer to this command
+                       // Otherwise, we should answer 8bytes (conf block 1) + 2bytes CRC
+                       if (chip_state == SELECTED) {
+                               if (simulationMode == ICLASS_SIM_MODE_FULL && max_page > 0) {
+                                       current_page = receivedCmd[1];
+                                       memcpy(data_generic_trace, emulator + current_page*page_size + 8*1, 8);
+                                       memcpy(diversified_key_d, emulator + current_page*page_size + 8*3, 8);
+                                       memcpy(diversified_key_c, emulator + current_page*page_size + 8*4, 8);
+                                       cipher_state = &cipher_state_KD[current_page];
+                                       personalization_mode = data_generic_trace[7] & 0x80;
+                                       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;

                                }
                        }
 
                                }
                        }
 

-                       /*if(error) {
-                               Uart.output[Uart.byteCnt] = 0xAA;
-                               Uart.byteCnt++;
-                               Uart.output[Uart.byteCnt] = error & 0xFF;
-                               Uart.byteCnt++;
-                               Uart.output[Uart.byteCnt] = 0xAA;
-                               Uart.byteCnt++;
-                               Uart.output[Uart.byteCnt] = (Uart.bitBuffer >> 8) & 0xFF;
-                               Uart.byteCnt++;
-                               Uart.output[Uart.byteCnt] = Uart.bitBuffer & 0xFF;
-                               Uart.byteCnt++;
-                               Uart.output[Uart.byteCnt] = (Uart.syncBit >> 3) & 0xFF;
-                               Uart.byteCnt++;
-                               Uart.output[Uart.byteCnt] = 0xAA;
-                               Uart.byteCnt++;
-                               return TRUE;
-                       }*/
+               } else if (receivedCmd[0] == 0x26 && len == 5) {
+                       // standard ISO15693 INVENTORY command. Ignore.
+
+               } else {
+                       // 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
+               }
+
+               /**
+               A legit tag has about 273,4us delay between reader EOT and tag SOF.
+               **/
+               if (modulated_response_size > 0) {
+                       uint32_t response_time = reader_eof_time + DELAY_ICLASS_VCD_TO_VICC_SIM;
+                       TransmitTo15693Reader(modulated_response, modulated_response_size, &response_time, 0, false);
+                       LogTrace_ISO15693(trace_data, trace_data_size, response_time*32, response_time*32 + modulated_response_size*32*64, NULL, false);

                }
 
        }
                }
 
        }

-       else {
-               bit = Uart.bitBuffer & 0xf0;
-               bit >>= 4;
-               bit ^= 0x0F; // drops become 1s ;-)
-               if(bit) {
-                       // should have been high or at least (4 * 128) / fc
-                       // according to ISO this should be at least (9 * 128 + 20) / fc
-                       if(Uart.highCnt == 8) {
-                               // we went low, so this could be start of communication
-                               // it turns out to be safer to choose a less significant
-                               // syncbit... so we check whether the neighbour also represents the drop
-                               Uart.posCnt = 1;   // apparently we are busy with our first half bit period
-                               Uart.syncBit = bit & 8;
-                               Uart.samples = 3;
-                               if(!Uart.syncBit)       { Uart.syncBit = bit & 4; Uart.samples = 2; }
-                               else if(bit & 4)        { Uart.syncBit = bit & 4; Uart.samples = 2; bit <<= 2; }
-                               if(!Uart.syncBit)       { Uart.syncBit = bit & 2; Uart.samples = 1; }
-                               else if(bit & 2)        { Uart.syncBit = bit & 2; Uart.samples = 1; bit <<= 1; }
-                               if(!Uart.syncBit)       { Uart.syncBit = bit & 1; Uart.samples = 0;
-                                       if(Uart.syncBit && (Uart.bitBuffer & 8)) {
-                                               Uart.syncBit = 8;
-
-                                               // the first half bit period is expected in next sample
-                                               Uart.posCnt = 0;
-                                               Uart.samples = 3;
-                                       }
-                               }
-                               else if(bit & 1)        { Uart.syncBit = bit & 1; Uart.samples = 0; }
-
-                               Uart.syncBit <<= 4;
-                               Uart.state = STATE_START_OF_COMMUNICATION;
-                               Uart.bitCnt = 0;
-                               Uart.byteCnt = 0;
-                               Uart.parityBits = 0;
-                               Uart.nOutOfCnt = 0;
-                               Uart.OutOfCnt = 4; // Start at 1/4, could switch to 1/256
-                               Uart.dropPosition = 0;
-                               Uart.shiftReg = 0;
-                               error = 0;
-                       }
-                       else {
-                               Uart.highCnt = 0;
+
+       if (buttonPressed)
+       {
+               DbpString("Button pressed");
+       }
+       return buttonPressed;
+}
+
+/**
+ * @brief SimulateIClass simulates an iClass card.
+ * @param arg0 type of simulation
+ *          - 0 uses the first 8 bytes in usb data as CSN
+ *          - 2 "dismantling iclass"-attack. This mode iterates through all CSN's specified
+ *          in the usb data. This mode collects MAC from the reader, in order to do an offline
+ *          attack on the keys. For more info, see "dismantling iclass" and proxclone.com.
+ *          - Other : Uses the default CSN (031fec8af7ff12e0)
+ * @param arg1 - number of CSN's contained in datain (applicable for mode 2 only)
+ * @param arg2
+ * @param datain
+ */
+void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain) {
+
+       LED_A_ON();
+
+       Iso15693InitTag();
+       
+       uint32_t simType = arg0;
+       uint32_t numberOfCSNS = arg1;
+
+       // Enable and clear the trace
+       set_tracing(true);
+       clear_trace();
+       //Use the emulator memory for SIM
+       uint8_t *emulator = BigBuf_get_EM_addr();
+
+       if (simType == ICLASS_SIM_MODE_CSN) {
+               // Use the CSN from commandline
+               memcpy(emulator, datain, 8);
+               doIClassSimulation(ICLASS_SIM_MODE_CSN, NULL);
+       } else if (simType == ICLASS_SIM_MODE_CSN_DEFAULT) {
+               //Default CSN
+               uint8_t csn[] = {0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0};
+               memcpy(emulator, csn, 8);
+               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 offline-attack
+               // in order to obtain the keys, as in the "dismantling iclass"-paper.
+               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(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

                }
                }

-               else {
-                       if(Uart.highCnt < 8) {
-                               Uart.highCnt++;
-                       }
+               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(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.
+               Dbprintf("The mode is not implemented, reserved for future use");
+       }
+
+       Dbprintf("Done...");
+
+       LED_A_OFF();
+}
+
+
+/// THE READER CODE
+
+static void ReaderTransmitIClass(uint8_t *frame, int len, uint32_t *start_time) {
+
+       CodeIso15693AsReader(frame, len);
+       TransmitTo15693Tag(ToSend, ToSendMax, start_time);
+       uint32_t end_time = *start_time + 32*(8*ToSendMax-4); // substract the 4 padding bits after EOF
+       LogTrace_ISO15693(frame, len, *start_time*4, end_time*4, NULL, true);
+}
+
+
+static bool sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t* resp, size_t max_resp_size,
+                                                                                 uint8_t expected_size, uint8_t tries, uint32_t start_time, uint32_t timeout, uint32_t *eof_time) {
+       while (tries-- > 0) {
+               ReaderTransmitIClass(command, cmdsize, &start_time);
+               if (expected_size == GetIso15693AnswerFromTag(resp, max_resp_size, timeout, eof_time)) {
+                       return true;

                }
        }
                }
        }

+       return false;//Error
+}

 
 

-    return FALSE;
+
+/**
+ * @brief Selects an iclass tag
+ * @param card_data where the CSN is stored for return
+ * @return false = fail
+ *         true = success
+ */
+static bool selectIclassTag(uint8_t *card_data, uint32_t *eof_time) {
+       uint8_t act_all[]      = { 0x0a };
+       uint8_t identify[]     = { 0x0c };
+       uint8_t select[]       = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+
+       uint8_t resp[ICLASS_BUFFER_SIZE];
+
+       uint32_t start_time = GetCountSspClk();
+
+       // Send act_all
+       ReaderTransmitIClass(act_all, 1, &start_time);
+       // Card present?
+       if (GetIso15693AnswerFromTag(resp, sizeof(resp), ICLASS_READER_TIMEOUT_ACTALL, eof_time) < 0) return false; //Fail
+
+       //Send Identify
+       start_time = *eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;
+       ReaderTransmitIClass(identify, 1, &start_time);
+       //We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC
+       uint8_t len = GetIso15693AnswerFromTag(resp, sizeof(resp), ICLASS_READER_TIMEOUT_OTHERS, eof_time);
+       if (len != 10) return false; //Fail
+
+       //Copy the Anti-collision CSN to our select-packet
+       memcpy(&select[1], resp, 8);
+       //Select the card
+       start_time = *eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;
+       ReaderTransmitIClass(select, sizeof(select), &start_time);
+       //We expect a 10-byte response here, 8 byte CSN and 2 byte CRC
+       len = GetIso15693AnswerFromTag(resp, sizeof(resp), ICLASS_READER_TIMEOUT_OTHERS, eof_time);
+       if (len != 10) return false; //Fail
+
+       //Success - we got CSN
+       //Save CSN in response data
+       memcpy(card_data, resp, 8);
+
+       return true;

 }
 
 }
 

-//=============================================================================
-// ISO 14443 Type A - Manchester
-//=============================================================================

 
 

-static struct {
-    enum {
-        DEMOD_UNSYNCD,
-               DEMOD_START_OF_COMMUNICATION,
-               DEMOD_START_OF_COMMUNICATION2,
-               DEMOD_START_OF_COMMUNICATION3,
-               DEMOD_SOF_COMPLETE,
-               DEMOD_MANCHESTER_D,
-               DEMOD_MANCHESTER_E,
-               DEMOD_END_OF_COMMUNICATION,
-               DEMOD_END_OF_COMMUNICATION2,
-               DEMOD_MANCHESTER_F,
-        DEMOD_ERROR_WAIT
-    }       state;
-    int     bitCount;
-    int     posCount;
-       int     syncBit;
-       int     parityBits;
-    uint16_t    shiftReg;
-       int     buffer;
-       int     buffer2;
-       int     buffer3;
-       int     buff;
-       int     samples;
-    int     len;
-       enum {
-               SUB_NONE,
-               SUB_FIRST_HALF,
-               SUB_SECOND_HALF,
-               SUB_BOTH
-       }               sub;
-    uint8_t   *output;
-} Demod;
-
-static RAMFUNC int ManchesterDecoding(int v)
-{
-       int bit;
-       int modulation;
-       int error = 0;
-
-       bit = Demod.buffer;
-       Demod.buffer = Demod.buffer2;
-       Demod.buffer2 = Demod.buffer3;
-       Demod.buffer3 = v;
-
-       if(Demod.buff < 3) {
-               Demod.buff++;
-               return FALSE;
+// Select an iClass tag and read all blocks which are always readable without authentication
+void ReaderIClass(uint8_t flags) {
+
+       LED_A_ON();
+
+       uint8_t card_data[6 * 8] = {0};
+       memset(card_data, 0xFF, sizeof(card_data));
+       uint8_t resp[ICLASS_BUFFER_SIZE];
+       //Read conf block CRC(0x01) => 0xfa 0x22
+       uint8_t readConf[] = {ICLASS_CMD_READ_OR_IDENTIFY, 0x01, 0xfa, 0x22};
+       //Read e-purse block CRC(0x02) => 0x61 0x10
+       uint8_t readEpurse[] = {ICLASS_CMD_READ_OR_IDENTIFY, 0x02, 0x61, 0x10};
+       //Read App Issuer Area block CRC(0x05) => 0xde  0x64
+       uint8_t readAA[] = {ICLASS_CMD_READ_OR_IDENTIFY, 0x05, 0xde, 0x64};
+
+       uint8_t result_status = 0;
+
+       if (flags & FLAG_ICLASS_READER_INIT) {
+               Iso15693InitReader();

        }
 
        }
 

-       if(Demod.state==DEMOD_UNSYNCD) {
-               Demod.output[Demod.len] = 0xfa;
-               Demod.syncBit = 0;
-               //Demod.samples = 0;
-               Demod.posCount = 1;             // This is the first half bit period, so after syncing handle the second part
-       /*      if(bit & 0x08) { Demod.syncBit = 0x08; }
-               if(!Demod.syncBit)      {
-                       if(bit & 0x04) { Demod.syncBit = 0x04; }
-               }
-               else if(bit & 0x04) { Demod.syncBit = 0x04; bit <<= 4; }
-               if(!Demod.syncBit)      {
-                       if(bit & 0x02) { Demod.syncBit = 0x02; }
-               }
-               else if(bit & 0x02) { Demod.syncBit = 0x02; bit <<= 4; }
-               if(!Demod.syncBit)      {
-                       if(bit & 0x01) { Demod.syncBit = 0x01; }
+       if (flags & FLAG_ICLASS_READER_CLEARTRACE) {
+               set_tracing(true);
+               clear_trace();
+               StartCountSspClk();
+       }

 
 

-                       if(Demod.syncBit && (Demod.buffer & 0x08)) {
-                               Demod.syncBit = 0x08;
+       uint32_t start_time = 0;
+       uint32_t eof_time = 0;

 
 

-                               // The first half bitperiod is expected in next sample
-                               Demod.posCount = 0;
-                               Demod.output[Demod.len] = 0xfb;
-                       }
-               }
-               else if(bit & 0x01) { Demod.syncBit = 0x01; }
-       */
+       if (selectIclassTag(resp, &eof_time)) {
+               result_status = FLAG_ICLASS_READER_CSN;
+               memcpy(card_data, resp, 8);

 
 

-               if(bit & 0x08) {
-                       Demod.syncBit = 0x08;
-               }
+               start_time = eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;

 
 

-               if(bit & 0x04) {
-                       if(Demod.syncBit) {
-                               bit <<= 4;
+               //Read block 1, config
+               if (flags & FLAG_ICLASS_READER_CONF) {
+                       if (sendCmdGetResponseWithRetries(readConf, sizeof(readConf), resp, sizeof(resp), 10, 10, start_time, ICLASS_READER_TIMEOUT_OTHERS, &eof_time)) {
+                               result_status |= FLAG_ICLASS_READER_CONF;
+                               memcpy(card_data+8, resp, 8);
+                       } else {
+                               Dbprintf("Failed to read config block");

                        }
                        }

-                       Demod.syncBit = 0x04;
+                       start_time = eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;

                }
 
                }
 

-               if(bit & 0x02) {
-                       if(Demod.syncBit) {
-                               bit <<= 2;
+               //Read block 2, e-purse
+               if (flags & FLAG_ICLASS_READER_CC) {
+                       if (sendCmdGetResponseWithRetries(readEpurse, sizeof(readEpurse), resp, sizeof(resp), 10, 10, start_time, ICLASS_READER_TIMEOUT_OTHERS, &eof_time)) {
+                               result_status |= FLAG_ICLASS_READER_CC;
+                               memcpy(card_data + (8*2), resp, 8);
+                       } else {
+                               Dbprintf("Failed to read e-purse");

                        }
                        }

-                       Demod.syncBit = 0x02;
+                       start_time = eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;

                }
 
                }
 

-               if(bit & 0x01 && Demod.syncBit) {
-                       Demod.syncBit = 0x01;
-               }
-               
-               if(Demod.syncBit) {
-                       Demod.len = 0;
-                       Demod.state = DEMOD_START_OF_COMMUNICATION;
-                       Demod.sub = SUB_FIRST_HALF;
-                       Demod.bitCount = 0;
-                       Demod.shiftReg = 0;
-                       Demod.parityBits = 0;
-                       Demod.samples = 0;
-                       if(Demod.posCount) {
-                               //if(trigger) LED_A_OFF();  // Not useful in this case...
-                               switch(Demod.syncBit) {
-                                       case 0x08: Demod.samples = 3; break;
-                                       case 0x04: Demod.samples = 2; break;
-                                       case 0x02: Demod.samples = 1; break;
-                                       case 0x01: Demod.samples = 0; break;
-                               }
-                               // SOF must be long burst... otherwise stay unsynced!!!
-                               if(!(Demod.buffer & Demod.syncBit) || !(Demod.buffer2 & Demod.syncBit)) {
-                                       Demod.state = DEMOD_UNSYNCD;
-                               }
+               //Read block 5, AA
+               if (flags & FLAG_ICLASS_READER_AA) {
+                       if (sendCmdGetResponseWithRetries(readAA, sizeof(readAA), resp, sizeof(resp), 10, 10, start_time, ICLASS_READER_TIMEOUT_OTHERS, &eof_time)) {
+                               result_status |= FLAG_ICLASS_READER_AA;
+                               memcpy(card_data + (8*5), resp, 8);
+                       } else {
+                               Dbprintf("Failed to read AA block");

                        }
                        }

-                       else {
-                               // SOF must be long burst... otherwise stay unsynced!!!
-                               if(!(Demod.buffer2 & Demod.syncBit) || !(Demod.buffer3 & Demod.syncBit)) {
-                                       Demod.state = DEMOD_UNSYNCD;
-                                       error = 0x88;
-                               }
+               }
+       }
+       
+       cmd_send(CMD_ACK, result_status, 0, 0, card_data, sizeof(card_data));

 
 

-                       }
-                       error = 0;
+       LED_A_OFF();
+}

 
 

-               }
+
+void iClass_Check(uint8_t *NRMAC) {
+       uint8_t check[9] = {ICLASS_CMD_CHECK_KD, 0x00};
+       uint8_t resp[4];
+       memcpy(check+1, NRMAC, 8);
+       uint32_t eof_time;
+       bool isOK = sendCmdGetResponseWithRetries(check, sizeof(check), resp, sizeof(resp), 4, 3, 0, ICLASS_READER_TIMEOUT_OTHERS, &eof_time);
+       cmd_send(CMD_ACK, isOK, 0, 0, resp, sizeof(resp));
+}
+
+
+void iClass_Readcheck(uint8_t block, bool use_credit_key) {
+       uint8_t readcheck[2] = {ICLASS_CMD_READCHECK_KD, block};
+       if (use_credit_key) {
+               readcheck[0] = ICLASS_CMD_READCHECK_KC;

        }
        }

-       else {
-               modulation = bit & Demod.syncBit;
-               modulation |= ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
-               //modulation = ((bit << 1) ^ ((Demod.buffer & 0x08) >> 3)) & Demod.syncBit;
+       uint8_t resp[8];
+       uint32_t eof_time;
+       bool isOK = sendCmdGetResponseWithRetries(readcheck, sizeof(readcheck), resp, sizeof(resp), 8, 3, 0, ICLASS_READER_TIMEOUT_OTHERS, &eof_time);
+       cmd_send(CMD_ACK, isOK, 0, 0, resp, sizeof(resp));
+}

 
 

-               Demod.samples += 4;

 
 

-               if(Demod.posCount==0) {
-                       Demod.posCount = 1;
-                       if(modulation) {
-                               Demod.sub = SUB_FIRST_HALF;
-                       }
-                       else {
-                               Demod.sub = SUB_NONE;
-                       }
-               }
-               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;
-                               }
-                               else {
-                                       Demod.sub = SUB_SECOND_HALF;
-                               }
-                       }
-                       else if(Demod.sub == SUB_NONE) {
-                               if(Demod.state == DEMOD_SOF_COMPLETE) {
-                                       Demod.output[Demod.len] = 0x0f;
-                                       Demod.len++;
-                                       Demod.parityBits <<= 1;
-                                       Demod.parityBits ^= OddByteParity[0x0f];
-                                       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;
-                               }*/
-                       }
+static bool iClass_ReadBlock(uint8_t blockNo, uint8_t *readdata) {
+       uint8_t readcmd[] = {ICLASS_CMD_READ_OR_IDENTIFY, blockNo, 0x00, 0x00}; //0x88, 0x00 // can i use 0C?
+       uint8_t bl = blockNo;
+       uint16_t rdCrc = iclass_crc16(&bl, 1);
+       readcmd[2] = rdCrc >> 8;
+       readcmd[3] = rdCrc & 0xff;
+       uint8_t resp[10];
+       uint32_t eof_time;

 
 

-                       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;
-                                       }
-                                       else {
-                                               Demod.output[Demod.len] = 0xab;
-                                               Demod.state = DEMOD_ERROR_WAIT;
-                                               error = 0xd2;
-                                       }
-                                       break;
-                               case DEMOD_START_OF_COMMUNICATION2:
-                                       if(Demod.sub == SUB_SECOND_HALF) {
-                                               Demod.state = DEMOD_START_OF_COMMUNICATION3;
-                                       }
-                                       else {
-                                               Demod.output[Demod.len] = 0xab;
-                                               Demod.state = DEMOD_ERROR_WAIT;
-                                               error = 0xd3;
-                                       }
-                                       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;
-                                               error = 0xd4;
-                                       }
-                                       break;
-                               case DEMOD_SOF_COMPLETE:
-                               case DEMOD_MANCHESTER_D:
-                               case DEMOD_MANCHESTER_E:
-                                       // OPPOSITE FROM ISO14443 - 11110000 = 0 (1 in 14443)
-                                       //                          00001111 = 1 (0 in 14443)
-                                       if(Demod.sub == SUB_SECOND_HALF) { // SUB_FIRST_HALF
-                                               Demod.bitCount++;
-                                               Demod.shiftReg = (Demod.shiftReg >> 1) ^ 0x100;
-                                               Demod.state = DEMOD_MANCHESTER_D;
-                                       }
-                                       else if(Demod.sub == SUB_FIRST_HALF) { // SUB_SECOND_HALF
-                                               Demod.bitCount++;
-                                               Demod.shiftReg >>= 1;
-                                               Demod.state = DEMOD_MANCHESTER_E;
-                                       }
-                                       else if(Demod.sub == SUB_BOTH) {
-                                               Demod.state = DEMOD_MANCHESTER_F;
-                                       }
-                                       else {
-                                               Demod.state = DEMOD_ERROR_WAIT;
-                                               error = 0x55;
-                                       }
-                                       break;
-
-                               case DEMOD_MANCHESTER_F:
-                                       // Tag response does not need to be a complete byte!
-                                       if(Demod.len > 0 || Demod.bitCount > 0) {
-                                               if(Demod.bitCount > 1) {  // was > 0, do not interpret last closing bit, is part of EOF
-                                                       Demod.shiftReg >>= (9 - Demod.bitCount);
-                                                       Demod.output[Demod.len] = Demod.shiftReg & 0xff;
-                                                       Demod.len++;
-                                                       // No parity bit, so just shift a 0
-                                                       Demod.parityBits <<= 1;
-                                               }
+       bool isOK = sendCmdGetResponseWithRetries(readcmd, sizeof(readcmd), resp, sizeof(resp), 10, 10, 0, ICLASS_READER_TIMEOUT_OTHERS, &eof_time);
+       memcpy(readdata, resp, sizeof(resp));

 
 

-                                               Demod.state = DEMOD_UNSYNCD;
-                                               return TRUE;
-                                       }
-                                       else {
-                                               Demod.output[Demod.len] = 0xad;
-                                               Demod.state = DEMOD_ERROR_WAIT;
-                                               error = 0x03;
-                                       }
-                                       break;
+       return isOK;
+}

 
 

-                               case DEMOD_ERROR_WAIT:
-                                       Demod.state = DEMOD_UNSYNCD;
-                                       break;

 
 

-                               default:
-                                       Demod.output[Demod.len] = 0xdd;
-                                       Demod.state = DEMOD_UNSYNCD;
-                                       break;
-                       }
+void iClass_ReadBlk(uint8_t blockno) {
+
+       LED_A_ON();

 
 

-                       /*if(Demod.bitCount>=9) {
-                               Demod.output[Demod.len] = Demod.shiftReg & 0xff;
-                               Demod.len++;
+       uint8_t readblockdata[10];
+       bool isOK = iClass_ReadBlock(blockno, readblockdata);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       LED_D_OFF();
+       cmd_send(CMD_ACK, isOK, 0, 0, readblockdata, 8);
+
+       LED_A_OFF();
+}

 
 

-                               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);
-                               Demod.len++;
+void iClass_Dump(uint8_t startblock, uint8_t numblks) {

 
 

-                               // FOR ISO15639 PARITY NOT SEND OTA, JUST CALCULATE IT FOR THE CLIENT
-                               Demod.parityBits <<= 1;
-                               Demod.parityBits ^= OddByteParity[(Demod.shiftReg & 0xff)];
+       LED_A_ON();

 
 

-                               Demod.bitCount = 0;
-                               Demod.shiftReg = 0;
-                       }
+       uint8_t readblockdata[USB_CMD_DATA_SIZE+2] = {0};
+       bool isOK = false;
+       uint16_t blkCnt = 0;

 
 

-                       if(error) {
-                               Demod.output[Demod.len] = 0xBB;
-                               Demod.len++;
-                               Demod.output[Demod.len] = error & 0xFF;
-                               Demod.len++;
-                               Demod.output[Demod.len] = 0xBB;
-                               Demod.len++;
-                               Demod.output[Demod.len] = bit & 0xFF;
-                               Demod.len++;
-                               Demod.output[Demod.len] = Demod.buffer & 0xFF;
-                               Demod.len++;
-                               // Look harder ;-)
-                               Demod.output[Demod.len] = Demod.buffer2 & 0xFF;
-                               Demod.len++;
-                               Demod.output[Demod.len] = Demod.syncBit & 0xFF;
-                               Demod.len++;
-                               Demod.output[Demod.len] = 0xBB;
-                               Demod.len++;
-                               return TRUE;
-                       }
+       if (numblks > USB_CMD_DATA_SIZE / 8) {
+               numblks = USB_CMD_DATA_SIZE / 8;
+       }

 
 

+       for (blkCnt = 0; blkCnt < numblks; blkCnt++) {
+               isOK = iClass_ReadBlock(startblock+blkCnt, readblockdata+8*blkCnt);
+               if (!isOK) {
+                       Dbprintf("Block %02X failed to read", startblock+blkCnt);
+                       break;

                }
                }

+       }
+
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       LED_D_OFF();

 
 

-       } // end (state != UNSYNCED)
+       cmd_send(CMD_ACK, isOK, blkCnt, 0, readblockdata, blkCnt*8);

 
 

-    return FALSE;
+       LED_A_OFF();

 }
 
 }
 

-//=============================================================================
-// Finally, a `sniffer' for ISO 14443 Type A
-// Both sides of communication!
-//=============================================================================

 
 

-//-----------------------------------------------------------------------------
-// Record the sequence of commands sent by the reader to the tag, with
-// triggering so that we start recording at the point that the tag is moved
-// near the reader.
-//-----------------------------------------------------------------------------
-void RAMFUNC SnoopIClass(void)
-{
-//     #define RECV_CMD_OFFSET         2032    // original (working as of 21/2/09) values
-//     #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
-
-    // We won't start recording the frames that we acquire until we trigger;
-    // a good trigger condition to get started is probably when we see a
-    // response from the tag.
-    int triggered = FALSE; // FALSE to wait first for card
-
-    // The command (reader -> tag) that we're receiving.
-       // The length of a received command will in most cases be no more than 18 bytes.
-       // So 32 should be enough!
-    uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
-    // The response (tag -> reader) that we're receiving.
-    uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RES_OFFSET);
-
-    // As we receive stuff, we copy it from receivedCmd or receivedResponse
-    // into trace, along with its length and other annotations.
-    //uint8_t *trace = (uint8_t *)BigBuf;
-    
-    traceLen = 0; // uncommented to fix ISSUE 15 - gerhard - jan2011
-
-    // The DMA buffer, used to stream samples from the FPGA
-    int8_t *dmaBuf = ((int8_t *)BigBuf) + DMA_BUFFER_OFFSET;
-    int lastRxCounter;
-    int8_t *upTo;
-    int smpl;
-    int maxBehindBy = 0;
-
-    // Count of samples received so far, so that we can include timing
-    // information in the trace buffer.
-    int samples = 0;
-    rsamples = 0;
-
-    memset(trace, 0x44, RECV_CMD_OFFSET);
-
-    // Set up the demodulator for tag -> reader responses.
-    Demod.output = receivedResponse;
-    Demod.len = 0;
-    Demod.state = DEMOD_UNSYNCD;
-
-    // Setup for the DMA.
-    FpgaSetupSsc();
-    upTo = dmaBuf;
-    lastRxCounter = DMA_BUFFER_SIZE;
-    FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
-
-    // And the reader -> tag commands
-    memset(&Uart, 0, sizeof(Uart));
-    Uart.output = receivedCmd;
-    Uart.byteCntMax = 32; // was 100 (greg)////////////////////////////////////////////////////////////////////////
-    Uart.state = STATE_UNSYNCD;
-
-    // And put the FPGA in the appropriate mode
-    // Signal field is off with the appropriate LED
-    LED_D_OFF();
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_SNIFFER);
-    SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-
-    int div = 0;
-    //int div2 = 0;
-    int decbyte = 0;
-    int decbyter = 0;
-
-    // And now we loop, receiving samples.
-    for(;;) {
-        LED_A_ON();
-        WDT_HIT();
-        int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
-                                (DMA_BUFFER_SIZE-1);
-        if(behindBy > maxBehindBy) {
-            maxBehindBy = behindBy;
-            if(behindBy > 400) {
-                Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
-                goto done;
-            }
-        }
-        if(behindBy < 1) continue;
+static bool iClass_WriteBlock_ext(uint8_t blockNo, uint8_t *data) {

 
 

-       LED_A_OFF();
-        smpl = upTo[0];
-        upTo++;
-        lastRxCounter -= 1;
-        if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
-            upTo -= DMA_BUFFER_SIZE;
-            lastRxCounter += DMA_BUFFER_SIZE;
-            AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
-            AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
-        }
-
-        //samples += 4;
-       samples += 1;
-       //div2++;       
-
-       //if(div2 > 3) {
-               //div2 = 0;
-       //decbyte ^= ((smpl & 0x01) << (3 - div));
-       //decbyte ^= (((smpl & 0x01) | ((smpl & 0x02) >> 1)) << (3 - div)); // better already...
-       //decbyte ^= (((smpl & 0x01) | ((smpl & 0x02) >> 1) | ((smpl & 0x04) >> 2)) << (3 - div)); // even better...
-       if(smpl & 0xF) {
-               decbyte ^= (1 << (3 - div));
-       }
-       //decbyte ^= (MajorityNibble[(smpl & 0x0F)] << (3 - div));
-       
-       // FOR READER SIDE COMMUMICATION...
-       //decbyte ^=  ((smpl & 0x10) << (3 - div));
-       decbyter <<= 2;
-       decbyter ^= (smpl & 0x30);
+       uint8_t write[16] = {ICLASS_CMD_UPDATE, blockNo};
+       memcpy(write+2, data, 12); // data + mac
+       AppendCrc(write+1, 13);
+       uint8_t resp[10];
+       bool isOK = false;
+       uint32_t eof_time = 0;

 
 

-       div++;
+       isOK = sendCmdGetResponseWithRetries(write, sizeof(write), resp, sizeof(resp), 10, 3, 0, ICLASS_READER_TIMEOUT_UPDATE, &eof_time);
+       if (!isOK) {
+               return false;
+       }

        
        

-       if((div + 1) % 2 == 0) {
-               smpl = decbyter;        
-               if(MillerDecoding((smpl & 0xF0) >> 4)) {
-                   rsamples = samples - Uart.samples;
-                   LED_C_ON();
-                   //if(triggered) {
-                       trace[traceLen++] = ((rsamples >>  0) & 0xff);
-                       trace[traceLen++] = ((rsamples >>  8) & 0xff);
-                       trace[traceLen++] = ((rsamples >> 16) & 0xff);
-                       trace[traceLen++] = ((rsamples >> 24) & 0xff);
-                       trace[traceLen++] = ((Uart.parityBits >>  0) & 0xff);
-                       trace[traceLen++] = ((Uart.parityBits >>  8) & 0xff);
-                       trace[traceLen++] = ((Uart.parityBits >> 16) & 0xff);
-                       trace[traceLen++] = ((Uart.parityBits >> 24) & 0xff);
-                       trace[traceLen++] = Uart.byteCnt;
-                       memcpy(trace+traceLen, receivedCmd, Uart.byteCnt);
-                       traceLen += Uart.byteCnt;
-                       if(traceLen > TRACE_LENGTH) break;
-                   //}
-                   /* And ready to receive another command. */
-                   Uart.state = STATE_UNSYNCD;
-                   /* And also reset the demod code, which might have been */
-                   /* false-triggered by the commands from the reader. */
-                   Demod.state = DEMOD_UNSYNCD;
-                   LED_B_OFF();
-                   Uart.byteCnt = 0;
+       uint8_t all_ff[8] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+       if (blockNo == 2) {
+               if (memcmp(data+4, resp, 4) || memcmp(data, resp+4, 4)) { // check response. e-purse update swaps first and second half
+                       return false;
+               }
+       } else if (blockNo == 3 || blockNo == 4) {
+               if (memcmp(all_ff, resp, 8)) { // check response. Key updates always return 0xffffffffffffffff
+                       return false;
+               }
+       } else {
+               if (memcmp(data, resp, 8)) { // check response. All other updates return unchanged data
+                       return false;

                }
                }

-               decbyter = 0;

        }
 
        }
 

-       if(div > 3) {
-               smpl = decbyte;
-               if(ManchesterDecoding(smpl & 0x0F)) {
-                   rsamples = samples - Demod.samples;
-                   LED_B_ON();
-
-                   // timestamp, as a count of samples
-                   trace[traceLen++] = ((rsamples >>  0) & 0xff);
-                   trace[traceLen++] = ((rsamples >>  8) & 0xff);
-                   trace[traceLen++] = ((rsamples >> 16) & 0xff);
-                   trace[traceLen++] = 0x80 | ((rsamples >> 24) & 0xff);
-                   trace[traceLen++] = ((Demod.parityBits >>  0) & 0xff);
-                   trace[traceLen++] = ((Demod.parityBits >>  8) & 0xff);
-                   trace[traceLen++] = ((Demod.parityBits >> 16) & 0xff);
-                   trace[traceLen++] = ((Demod.parityBits >> 24) & 0xff);
-                   // length
-                   trace[traceLen++] = Demod.len;
-                   memcpy(trace+traceLen, receivedResponse, Demod.len);
-                   traceLen += Demod.len;
-                   if(traceLen > TRACE_LENGTH) break;
-
-                   triggered = TRUE;
-
-                   // And ready to receive another response.
-                   memset(&Demod, 0, sizeof(Demod));
-                   Demod.output = receivedResponse;
-                   Demod.state = DEMOD_UNSYNCD;
-                   LED_C_OFF();
-               }
-               
-               div = 0;
-               decbyte = 0x00;
+       return true;
+}
+
+
+void iClass_WriteBlock(uint8_t blockNo, uint8_t *data) {
+
+       LED_A_ON();
+
+       bool isOK = iClass_WriteBlock_ext(blockNo, data);
+       if (isOK) {
+               Dbprintf("Write block [%02x] successful", blockNo);
+       } else {
+               Dbprintf("Write block [%02x] failed", blockNo);

        }
        }

-       //}
-
-        if(BUTTON_PRESS()) {
-            DbpString("cancelled_a");
-            goto done;
-        }
-    }
-
-    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]);
-    LED_A_OFF();
-    LED_B_OFF();
-       LED_C_OFF();
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

        LED_D_OFF();
        LED_D_OFF();

+
+       cmd_send(CMD_ACK, isOK, 0, 0, 0, 0);
+       LED_A_OFF();

 }
 
 }
 

+
+void iClass_Clone(uint8_t startblock, uint8_t endblock, uint8_t *data) {
+
+       LED_A_ON();
+
+       int written = 0;
+       int total_blocks = (endblock - startblock) + 1;
+
+       for (uint8_t block = startblock; block <= endblock; block++) {
+               // block number
+               if (iClass_WriteBlock_ext(block, data + (block-startblock)*12)) {
+                       Dbprintf("Write block [%02x] successful", block);
+                       written++;
+               } else {
+                       Dbprintf("Write block [%02x] failed", block);
+               }
+       }
+
+       if (written == total_blocks)
+               Dbprintf("Clone complete");
+       else
+               Dbprintf("Clone incomplete");
+
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       LED_D_OFF();
+
+       cmd_send(CMD_ACK, 1, 0, 0, 0, 0);
+       LED_A_OFF();
+}