fix 'hf iclass sim'
authorpwpiwi <pwpiwi@users.noreply.github.com>
Tue, 1 Oct 2019 19:03:18 +0000 (21:03 +0200)
committerpwpiwi <pwpiwi@users.noreply.github.com>
Wed, 2 Oct 2019 06:20:17 +0000 (08:20 +0200)
* add simulation of multiple pages (PAGESEL by @sherhannn9)
* maintain cipher states per page
* update cipher state after UPDATE commands (@sherhannn9)
* add simulation of personalization mode
* respond with SOF on HALT
* display "<SOF>" instead of "0f" in 'hf list iclass'
* standard LED handling

armsrc/iclass.c
client/cmdhflist.c

index 0b77a039f9a004deb9e42e2656042f0ae73952c3..d8f68c789fdc75c0d3a8779ff5a8157b7b6f5a4d 100644 (file)
@@ -758,15 +758,8 @@ void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
 
 // Encode SOF only
 static void CodeIClassTagSOF() {
-       //So far a dummy implementation, not used
-       //int lastProxToAirDuration =0;
-
        ToSendReset();
-       // Send SOF
        ToSend[++ToSendMax] = 0x1D;
-//  lastProxToAirDuration  = 8*ToSendMax - 3*8;//Not counting zeroes in the beginning
-
-       // Convert from last byte pos to length
        ToSendMax++;
 }
 
@@ -783,16 +776,20 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
        // free eventually allocated BigBuf memory
        BigBuf_free_keep_EM();
 
-       State cipher_state_KC;
-       State cipher_state_KD;
+       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;
-       uint8_t sof_data[] = { 0x0F } ;
 
        // CSN followed by two CRC bytes
-       uint8_t anticoll_data[10] = { 0 };
-       uint8_t csn_data[10] = { 0 };
+       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]);
 
@@ -803,26 +800,56 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
        AppendCrc(anticoll_data, 8);
        AppendCrc(csn_data, 8);
 
-       uint8_t diversified_key_d[8] = { 0 };
-       uint8_t diversified_key_c[8] = { 0 };
+       uint8_t diversified_key_d[8];
+       uint8_t diversified_key_c[8];
+       uint8_t *diversified_key = diversified_key_d;
+       
+       // configuration block
+       uint8_t conf_block[10] = {0x12, 0xFF, 0xFF, 0xFF, 0x7F, 0x1F, 0xFF, 0x3C, 0x00, 0x00};
+       AppendCrc(conf_block, 8);
+
        // e-Purse
        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) {
-               // Get the diversified keys from emulator memory
-               memcpy(diversified_key_d, emulator + (8 * 3), 8);
-               memcpy(diversified_key_c, emulator + (8 * 4), 8);
-               // Card challenge, a.k.a e-purse is on block 2
-               memcpy(card_challenge_data, emulator + (8 * 2), 8);
-               // Precalculate the cipher states, feeding it the CC
-               cipher_state_KD = opt_doTagMAC_1(card_challenge_data, diversified_key_d);
-               cipher_state_KC = opt_doTagMAC_1(card_challenge_data, diversified_key_c);
+               // 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
        }
+
        // save card challenge for sim2,4 attack
        if (reader_mac_buf != NULL) {
                memcpy(reader_mac_buf, card_challenge_data, 8);
        }
 
+       if (conf_block[5] & 0x80) {
+               page_size = 256 * 8;
+       }
+
+       // 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);
+               }
+       }
+                       
        int exitLoop = 0;
        // Reader 0a
        // Tag    0f
@@ -837,7 +864,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
        int trace_data_size = 0;
 
        // Respond SOF -- takes 1 bytes
-       uint8_t *resp_sof = BigBuf_malloc(2);
+       uint8_t *resp_sof = BigBuf_malloc(1);
        int resp_sof_Len;
 
        // Anticollision CSN (rotated CSN)
@@ -853,8 +880,6 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
        // 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)
@@ -877,7 +902,6 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
        int len;
 
        // Prepare card messages
-       ToSendMax = 0;
 
        // First card answer: SOF only
        CodeIClassTagSOF();
@@ -895,7 +919,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
        resp_csn_len = ToSendMax;
 
        // Configuration (block 1)
-       CodeIso15693AsTag(conf_data, sizeof(conf_data));
+       CodeIso15693AsTag(conf_block, sizeof(conf_block));
        memcpy(resp_conf, ToSend, ToSendMax);
        resp_conf_len = ToSendMax;
 
@@ -918,16 +942,11 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
        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;
        enum { IDLE, ACTIVATED, SELECTED, HALTED } chip_state = IDLE;
 
        while (!exitLoop) {
                WDT_HIT();
-               LED_B_OFF();
-               //Signal tracer
-               // Can be used to get a trigger for an oscilloscope..
-               LED_C_OFF();
 
                uint32_t reader_eof_time = 0;
                len = GetIso15693CommandFromReader(receivedCmd, MAX_FRAME_SIZE, &reader_eof_time);
@@ -936,9 +955,6 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
                        break;
                }
 
-               //Signal tracer
-               LED_C_ON();
-
                // Now look at the reader command and provide appropriate responses
                // default is no response:
                modulated_response = NULL;
@@ -951,8 +967,6 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
                        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;
                        }
 
@@ -1004,8 +1018,8 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
                                                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);
+                                                       trace_data = conf_block;
+                                                       trace_data_size = sizeof(conf_block);
                                                        break;
                                                case 2: // e-purse (block 02)
                                                        modulated_response = resp_cc;
@@ -1039,7 +1053,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
                                                trace_data = ff_data;
                                                trace_data_size = sizeof(ff_data);
                                        } else { // use data from emulator memory
-                                               memcpy(data_generic_trace, emulator + 8*blockNo, 8);
+                                               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;
@@ -1055,11 +1069,17 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
                                        || 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);
-                               LED_B_ON();
                        }
 
                } else if ((receivedCmd[0] == ICLASS_CMD_CHECK_KC 
@@ -1068,11 +1088,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
                        if (chip_state == SELECTED) {
                                if (simulationMode == ICLASS_SIM_MODE_FULL) {
                                        //NR, from reader, is in receivedCmd+1
-                                       if (receivedCmd[0] == ICLASS_CMD_CHECK_KC) {
-                                               opt_doTagMAC_2(cipher_state_KC, receivedCmd+1, data_generic_trace, diversified_key_c);
-                                       } else {
-                                               opt_doTagMAC_2(cipher_state_KD, receivedCmd+1, data_generic_trace, diversified_key_d);
-                                       }
+                                       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);
@@ -1095,13 +1111,16 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
                } 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) {
-                               memcpy(data_generic_trace, emulator + receivedCmd[1]*8, 8 * 4);
+                               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;
@@ -1121,29 +1140,37 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
                                        CodeIso15693AsTag(card_challenge_data, sizeof(card_challenge_data));
                                        memcpy(resp_cc, ToSend, ToSendMax);
                                        resp_cc_len = ToSendMax;
-                                       cipher_state_KD = opt_doTagMAC_1(card_challenge_data, diversified_key_d);
-                                       cipher_state_KC = opt_doTagMAC_1(card_challenge_data, diversified_key_c);
+                                       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 + 8*2, card_challenge_data, 8);
+                                               memcpy(emulator + current_page*page_size + 8*2, card_challenge_data, 8);
                                        }
                                } else if (blockNo == 3) { // update Kd
-                                       for (int i = 0; i < 8; i++){
-                                               diversified_key_d[i] = diversified_key_d[i] ^ receivedCmd[2 + i];                                                       
+                                       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];
+                                               }                                               
                                        }
-                                       cipher_state_KD = opt_doTagMAC_1(card_challenge_data, diversified_key_d);                               
+                                       cipher_state_KD[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_d);                         
                                        if (simulationMode == ICLASS_SIM_MODE_FULL) {
-                                               memcpy(emulator + 8*3, diversified_key_d, 8);
+                                               memcpy(emulator + current_page*page_size + 8*3, diversified_key_d, 8);
                                        }
                                } else if (blockNo == 4) { // update Kc                                 
-                                       for(int i = 0; i < 8; i++){
-                                               diversified_key_c[i] = diversified_key_c[i] ^ receivedCmd[2 + i];                                       
+                                       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 = opt_doTagMAC_1(card_challenge_data, diversified_key_c);
+                                       cipher_state_KC[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_c);
                                        if (simulationMode == ICLASS_SIM_MODE_FULL) {
-                                               memcpy(emulator + 8*4, diversified_key_c, 8);
+                                               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 + 8*blockNo, receivedCmd+2, 8);
+                                               memcpy(emulator + current_page*page_size + 8*blockNo, receivedCmd+2, 8);
                                }                                       
                                memcpy(data_generic_trace, receivedCmd + 2, 8);
                                AppendCrc(data_generic_trace, 8);
@@ -1157,11 +1184,24 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 
                } 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 (block) + 2bytes CRC
                        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
+                               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;
+                               }
                        }
 
                } else if (receivedCmd[0] == 0x26 && len == 5) {
@@ -1189,10 +1229,6 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 
        }
 
-       LED_A_OFF();
-       LED_B_OFF();
-       LED_C_OFF();
-
        if (buttonPressed)
        {
                DbpString("Button pressed");
@@ -1213,6 +1249,9 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
  * @param datain
  */
 void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain) {
+       
+       LED_A_ON();
+       
        uint32_t simType = arg0;
        uint32_t numberOfCSNS = arg1;
 
@@ -1220,6 +1259,7 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION);
+       LED_D_OFF();
        FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR);
        StartCountSspClk();
 
@@ -1270,8 +1310,10 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
                // 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();
 }
 
 
index 1b8e0955b4fd89c7b3102d5e80765d381ae8d458..07a286cc3e89d7d5ac8ea476ce387bc0ab8c51a0 100644 (file)
@@ -225,17 +225,18 @@ void annotateIclass(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize) {
                }
                break;
        }
-       case ICLASS_CMD_SELECT:      snprintf(exp,size, "SELECT"); break;
-       case ICLASS_CMD_PAGESEL:     snprintf(exp,size, "PAGESEL(%d)", cmd[1]); break;
-       case ICLASS_CMD_READCHECK_KC:snprintf(exp,size, "READCHECK[Kc](%d)", cmd[1]); break;
-       case ICLASS_CMD_READCHECK_KD:snprintf(exp,size, "READCHECK[Kd](%d)", cmd[1]); break;
-       case ICLASS_CMD_CHECK:       snprintf(exp,size, "CHECK"); break;
-       case ICLASS_CMD_DETECT:      snprintf(exp,size, "DETECT"); break;
-       case ICLASS_CMD_HALT:        snprintf(exp,size, "HALT"); break;
-       case ICLASS_CMD_UPDATE:      snprintf(exp,size, "UPDATE(%d)",cmd[1]); break;
-       case ICLASS_CMD_ACT:         snprintf(exp,size, "ACT"); break;
-       case ICLASS_CMD_READ4:       snprintf(exp,size, "READ4(%d)",cmd[1]); break;
-       default:                     snprintf(exp,size, "?"); break;
+       case ICLASS_CMD_SELECT:       snprintf(exp,size, "SELECT"); break;
+       case ICLASS_CMD_PAGESEL:      snprintf(exp,size, "PAGESEL(%d)", cmd[1]); break;
+       case ICLASS_CMD_READCHECK_KC: snprintf(exp,size, "READCHECK[Kc](%d)", cmd[1]); break;
+       case ICLASS_CMD_READCHECK_KD: snprintf(exp,size, "READCHECK[Kd](%d)", cmd[1]); break;
+       case ICLASS_CMD_CHECK_KC:
+       case ICLASS_CMD_CHECK_KD:     snprintf(exp,size, "CHECK"); break;
+       case ICLASS_CMD_DETECT:       snprintf(exp,size, "DETECT"); break;
+       case ICLASS_CMD_HALT:         snprintf(exp,size, "HALT"); break;
+       case ICLASS_CMD_UPDATE:       snprintf(exp,size, "UPDATE(%d)",cmd[1]); break;
+       case ICLASS_CMD_ACT:          snprintf(exp,size, "ACT"); break;
+       case ICLASS_CMD_READ4:        snprintf(exp,size, "READ4(%d)",cmd[1]); break;
+       default:                      snprintf(exp,size, "?"); break;
        }
        return;
 }
@@ -336,7 +337,7 @@ void annotateIso14443_4(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize){
        else {
                int pos = 1;
                switch (cmd[0] & 0x0c) {
-                       case 0x08: // CID following 
+                       case 0x08: // CID following
                        case 0x04: // NAD following
                                pos = 2;
                                break;
@@ -906,7 +907,7 @@ uint16_t printTraceLine(uint16_t tracepos, uint16_t traceLen, uint8_t *trace, ui
                timestamp *= 32;
                duration *= 32;
        }
-       
+
        //Check the CRC status
        uint8_t crcStatus = 2;
 
@@ -969,11 +970,15 @@ uint16_t printTraceLine(uint16_t tracepos, uint16_t traceLen, uint8_t *trace, ui
        if (protocol == ISO_14443A || protocol == PROTO_MIFARE) {
                if (duration < 128 * (9 * data_len)) {
                        line[(data_len-1)/16][((data_len-1)%16) * 4 + 3] = '\'';
-               }       
+               }
        }
-       
+
        if (data_len == 0) {
-               sprintf(line[0]," <empty trace - possible error>");
+               if (protocol == ICLASS && duration == 2048) {
+                       sprintf(line[0], " <SOF>");
+               } else {
+                       sprintf(line[0], " <empty trace - possible error>");
+               }
        }
 
        //--- Draw the CRC column
@@ -1014,7 +1019,7 @@ uint16_t printTraceLine(uint16_t tracepos, uint16_t traceLen, uint8_t *trace, ui
                                (j == num_lines-1) ? explanation : "");
                }
        }
-               
+
        if (DecodeMifareData(frame, data_len, parityBytes, isResponse, mfData, &mfDataLen)) {
                memset(explanation, 0x00, sizeof(explanation));
                if (!isResponse) {
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