+//-----------------------------------------------------------------------------
+//
+// 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
+// the license.
+//-----------------------------------------------------------------------------
+// Low frequency visa 200 tag commands
+// by iceman
+//-----------------------------------------------------------------------------
+
+#include "cmdlfvisa2000.h"
+#include "proxmark3.h"
+#include "ui.h"
+#include "util.h"
+#include "graph.h"
+#include "cmddata.h" // for ASKDemod_ext, g_debugMode, DemodBuffer ...
+#include "cmdmain.h" // for clearCommandBuffer and WaitForResponseTimeout
+#include "cmdlf.h"
+#include "protocols.h" // for T55xx config register definitions
+#include "lfdemod.h" // for Visa2kDemod_AM
+
+#define BL0CK1 0x56495332
+
+static int CmdHelp(const char *Cmd);
+
+int usage_lf_visa2k_clone(void){
+ PrintAndLog("clone a Visa2000 tag to a T55x7 tag.");
+ PrintAndLog("Usage: lf visa2k clone [h] <card ID> <Q5>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h : This help");
+ PrintAndLog(" <card ID> : Visa2k card ID");
+ PrintAndLog(" <Q5> : specify write to Q5 (t5555 instead of t55x7)");
+ PrintAndLog("");
+ PrintAndLog("Sample: lf visa2k clone 112233");
+ return 0;
+}
+
+int usage_lf_visa2k_sim(void) {
+ PrintAndLog("Enables simulation of visa2k card with specified card number.");
+ PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
+ PrintAndLog("");
+ PrintAndLog("Usage: lf visa2k sim [h] <card ID>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h : This help");
+ PrintAndLog(" <card ID> : Visa2k card ID");
+ PrintAndLog("");
+ PrintAndLog("Sample: lf visa2k sim 112233");
+ return 0;
+}
+
+static uint8_t visa_chksum( uint32_t id ) {
+ uint8_t sum = 0;
+ for (uint8_t i = 0; i < 32; i += 4)
+ sum ^= (id >> i) & 0xF;
+
+ return sum;
+}
+
+static uint8_t visa_parity( uint32_t id) {
+ // 4bit parity LUT
+ uint8_t par_lut[] = {
+ 0,1,1,0
+ ,1,0,0,1
+ ,1,0,0,1
+ ,0,1,1,0
+ };
+ uint8_t par = 0;
+ par |= par_lut[ (id >> 28) & 0xF ] << 7;
+ par |= par_lut[ (id >> 24) & 0xF ] << 6;
+ par |= par_lut[ (id >> 20) & 0xF ] << 5;
+ par |= par_lut[ (id >> 16) & 0xF ] << 4;
+ par |= par_lut[ (id >> 12) & 0xF ] << 3;
+ par |= par_lut[ (id >> 8) & 0xF ] << 2;
+ par |= par_lut[ (id >> 4) & 0xF ] << 1;
+ par |= par_lut[ (id & 0xF) ];
+ return par;
+}
+
+
+/**
+*
+* 56495332 00096ebd 00000077 —> tag id 618173
+* aaaaaaaa iiiiiiii -----..c
+*
+* a = fixed value ascii 'VIS2'
+* i = card id
+* c = checksum (xor of card id)
+* . = unknown
+*
+**/
+//see ASKDemod for what args are accepted
+int CmdVisa2kDemod(const char *Cmd) {
+
+ //sCmdAskEdgeDetect("");
+
+ //ASK / Manchester
+ bool st = true;
+ if (!ASKDemod_ext("64 0 0", false, false, 1, &st)) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - Visa2k: ASK/Manchester Demod failed");
+ return 0;
+ }
+ size_t size = DemodBufferLen;
+ int ans = Visa2kDemod_AM(DemodBuffer, &size);
+ if (ans < 0){
+ if (g_debugMode){
+ if (ans == -1)
+ PrintAndLog("DEBUG: Error - Visa2k: too few bits found");
+ else if (ans == -2)
+ PrintAndLog("DEBUG: Error - Visa2k: preamble not found");
+ else if (ans == -3)
+ PrintAndLog("DEBUG: Error - Visa2k: Size not correct: %d", size);
+ else
+ PrintAndLog("DEBUG: Error - Visa2k: ans: %d", ans);
+ }
+ return 0;
+ }
+ setDemodBuf(DemodBuffer, 96, ans);
+ //setGrid_Clock(64);
+
+ //got a good demod
+ uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
+ uint32_t raw2 = bytebits_to_byte(DemodBuffer+32, 32);
+ uint32_t raw3 = bytebits_to_byte(DemodBuffer+64, 32);
+
+ // chksum
+ uint8_t calc = visa_chksum(raw2);
+ uint8_t chk = raw3 & 0xF;
+
+ // test checksums
+ if ( chk != calc ) {
+ printf("DEBUG: error: Visa2000 checksum failed %x - %x\n", chk, calc);
+ return 0;
+ }
+ // parity
+ uint8_t calc_par = visa_parity(raw2);
+ uint8_t chk_par = (raw3 & 0xFF0) >> 4;
+ if ( calc_par != chk_par) {
+ printf("DEBUG: error: Visa2000 parity failed %x - %x\n", chk_par, calc_par);
+ return 0;
+ }
+ PrintAndLog("Visa2000 Tag Found: Card ID %u, Raw: %08X%08X%08X", raw2, raw1 ,raw2, raw3);
+ return 1;
+}
+
+int CmdVisa2kRead(const char *Cmd) {
+ CmdLFRead("s");
+ //64*96*2=12288 samples just in case we just missed the first preamble we can still catch 2 of them
+ getSamples("12500",true);
+ return CmdVisa2kDemod(Cmd);
+}
+
+int CmdVisa2kClone(const char *Cmd) {
+
+ uint64_t id = 0;
+ uint32_t blocks[4] = {T55x7_MODULATION_MANCHESTER | T55x7_BITRATE_RF_64 | T55x7_ST_TERMINATOR | 3 << T55x7_MAXBLOCK_SHIFT, BL0CK1, 0};
+
+ char cmdp = param_getchar(Cmd, 0);
+ if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_clone();
+
+ id = param_get32ex(Cmd, 0, 0, 10);
+
+ //Q5
+ if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
+ //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
+ blocks[0] = T5555_MODULATION_MANCHESTER | ((64-2)>>1) << T5555_BITRATE_SHIFT | T5555_ST_TERMINATOR | 3 << T5555_MAXBLOCK_SHIFT;
+ }
+
+ blocks[2] = id;
+ blocks[3] = (visa_parity(id) << 4) | visa_chksum(id);
+
+ PrintAndLog("Preparing to clone Visa2000 to T55x7 with CardId: %u", id);
+ PrintAndLog("Blk | Data ");
+ PrintAndLog("----+------------");
+ for(int i = 0; i<4; ++i)
+ PrintAndLog(" %02d | 0x%08x", i , blocks[i]);
+
+ UsbCommand resp;
+ UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
+
+ for (int i = 3; i >= 0; --i) {
+ c.arg[0] = blocks[i];
+ c.arg[1] = i;
+ clearCommandBuffer();
+ SendCommand(&c);
+ if (!WaitForResponseTimeout(CMD_ACK, &resp, T55XX_WRITE_TIMEOUT)){
+ PrintAndLog("Error occurred, device did not respond during write operation.");
+ return -1;
+ }
+ }
+ return 0;
+}
+
+int CmdVisa2kSim(const char *Cmd) {
+
+ uint32_t id = 0;
+ char cmdp = param_getchar(Cmd, 0);
+ if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_visa2k_sim();
+
+ id = param_get32ex(Cmd, 0, 0, 10);
+
+ uint8_t clk = 64, encoding = 1, separator = 1, invert = 0;
+ uint16_t arg1, arg2;
+ size_t size = 96;
+ arg1 = clk << 8 | encoding;
+ arg2 = invert << 8 | separator;
+
+ PrintAndLog("Simulating Visa2000 - CardId: %u", id);
+
+ UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
+
+ uint32_t blocks[3] = { BL0CK1, id, (visa_parity(id) << 4) | visa_chksum(id) };
+
+ for(int i=0; i<3; ++i)
+ num_to_bytebits(blocks[i], 32, c.d.asBytes + i*32);
+
+ clearCommandBuffer();
+ SendCommand(&c);
+ return 0;
+}
+
+static command_t CommandTable[] = {
+ {"help", CmdHelp, 1, "This help"},
+ {"demod", CmdVisa2kDemod, 1, "Attempt to demod from GraphBuffer"},
+ {"read", CmdVisa2kRead, 0, "Attempt to read and extract tag data"},
+ {"clone", CmdVisa2kClone, 0, "clone Visa2000 tag"},
+ {"sim", CmdVisa2kSim, 0, "simulate Visa2000 tag"},
+ {NULL, NULL, 0, NULL}
+};
+
+int CmdLFVisa2k(const char *Cmd) {
+ clearCommandBuffer();
+ CmdsParse(CommandTable, Cmd);
+ return 0;
+}
+
+int CmdHelp(const char *Cmd) {
+ CmdsHelp(CommandTable);
+ return 0;
+}
projects / proxmark3-svn / commitdiff