new files

client/cmdlfverichip.c

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+//-----------------------------------------------------------------------------
+//
+// 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 Verichip tag commands
+//NRZ, RF/32, 128 bits long
+//-----------------------------------------------------------------------------
+#include "cmdlfverichip.h"
+
+#include <ctype.h>          //tolower
+
+#include "commonutil.h"     // ARRAYLEN
+#include "common.h"
+#include "cmdparser.h"    // command_t
+#include "comms.h"
+#include "ui.h"
+#include "cmddata.h"
+#include "cmdlf.h"
+#include "lfdemod.h"    // preamble test
+#include "protocols.h"  // t55xx defines
+#include "cmdlft55xx.h" // clone..
+
+static int CmdHelp(const char *Cmd);
+
+static int usage_lf_verichip_clone(void) {
+    PrintAndLogEx(NORMAL, "clone a verichip tag to a T55x7 tag.");
+    PrintAndLogEx(NORMAL, "");
+    PrintAndLogEx(NORMAL, "Usage: lf verichip clone [h] [b <raw hex>]");
+    PrintAndLogEx(NORMAL, "Options:");
+    PrintAndLogEx(NORMAL, "  h               : this help");
+    PrintAndLogEx(NORMAL, "  b <raw hex>     : raw hex data. 12 bytes max");
+    PrintAndLogEx(NORMAL, "");
+    PrintAndLogEx(NORMAL, "Examples:");
+    PrintAndLogEx(NORMAL, "       lf verichip clone b FF2049906D8511C593155B56D5B2649F ");
+    return PM3_SUCCESS;
+}
+
+//see NRZDemod for what args are accepted
+static int CmdVerichipDemod(const char *Cmd) {
+
+    //NRZ
+    if (NRZrawDemod(Cmd, false) != PM3_SUCCESS) {
+        PrintAndLogEx(DEBUG, "DEBUG: Error - VERICHIP: NRZ Demod failed");
+        return PM3_ESOFT;
+    }
+    size_t size = DemodBufferLen;
+    int ans = detectVerichip(DemodBuffer, &size);
+    if (ans < 0) {
+        if (ans == -1)
+            PrintAndLogEx(DEBUG, "DEBUG: Error - VERICHIP: too few bits found");
+        else if (ans == -2)
+            PrintAndLogEx(DEBUG, "DEBUG: Error - VERICHIP: preamble not found");
+        else if (ans == -3)
+            PrintAndLogEx(DEBUG, "DEBUG: Error - VERICHIP: Size not correct: %d", size);
+        else
+            PrintAndLogEx(DEBUG, "DEBUG: Error - VERICHIP: ans: %d", ans);
+
+        return PM3_ESOFT;
+    }
+    setDemodBuff(DemodBuffer, 128, ans);
+    setClockGrid(g_DemodClock, g_DemodStartIdx + (ans * g_DemodClock));
+
+    //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);
+    uint32_t raw4 = bytebits_to_byte(DemodBuffer + 96, 32);
+
+    // preamble     then appears to have marker bits of "10"                                                                                                                                       CS?
+    // 11111111001000000 10 01001100 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 10001100 10 100000001
+    // unknown checksum 9 bits at the end
+
+    PrintAndLogEx(SUCCESS, "VERICHIP Tag Found -- Raw: %08X%08X%08X%08X", raw1, raw2, raw3, raw4);
+    PrintAndLogEx(INFO, "How the Raw ID is translated by the reader is unknown. Share your trace file on forum");
+    return PM3_SUCCESS;
+}
+
+static int CmdVerichipRead(const char *Cmd) {
+    lf_read(true, 4096 * 2 + 20);
+    return CmdVerichipDemod(Cmd);
+}
+
+static int CmdVerichipClone(const char *Cmd) {
+
+    uint32_t blocks[5];
+    bool errors = false;
+    uint8_t cmdp = 0;
+    int datalen = 0;
+
+    while (param_getchar(Cmd, cmdp) != 0x00 && !errors) {
+        switch (tolower(param_getchar(Cmd, cmdp))) {
+            case 'h':
+                return usage_lf_verichip_clone();
+            case 'b': {
+                // skip first block,  4*4 = 16 bytes left
+                uint8_t rawhex[16] = {0}; 
+                int res = param_gethex_to_eol(Cmd, cmdp + 1, rawhex, sizeof(rawhex), &datalen);
+                if ( res != 0 )
+                    errors = true;
+
+                for(uint8_t i = 1; i < ARRAYLEN(blocks); i++) {
+                    blocks[i] = bytes_to_num(rawhex + ( (i - 1) * 4 ), sizeof(uint32_t));
+                }
+                cmdp += 2;
+                break;
+            }
+            default:
+                PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
+                errors = true;
+                break;
+        }
+    }
+
+    if (errors || cmdp == 0) return usage_lf_verichip_clone();
+
+    //Pac - compat mode, NRZ, data rate 40, 3 data blocks
+    blocks[0] = T55x7_MODULATION_DIRECT | T55x7_BITRATE_RF_40 | 4 << T55x7_MAXBLOCK_SHIFT;
+
+    PrintAndLogEx(INFO, "Preparing to clone Verichip to T55x7 with raw hex");
+    print_blocks(blocks,  ARRAYLEN(blocks));
+
+    return clone_t55xx_tag(blocks, ARRAYLEN(blocks));
+}
+
+static int CmdVerichipSim(const char *Cmd) {
+
+    // NRZ sim.
+    PrintAndLogEx(INFO, " To be implemented, feel free to contribute!");
+    return PM3_SUCCESS;
+}
+
+static command_t CommandTable[] = {
+    {"help",  CmdHelp,           AlwaysAvailable, "This help"},
+    {"demod", CmdVerichipDemod,  AlwaysAvailable, "Demodulate an VERICHIP tag from the GraphBuffer"},
+    {"read",  CmdVerichipRead,   IfPm3Lf,         "Attempt to read and extract tag data from the antenna"},
+    {"clone", CmdVerichipClone,  IfPm3Lf,         "clone VERICHIP tag"},
+    {"sim",   CmdVerichipSim,    IfPm3Lf,         "simulate VERICHIP tag"},
+    {NULL, NULL, NULL, NULL}
+};
+
+static int CmdHelp(const char *Cmd) {
+    (void)Cmd; // Cmd is not used so far
+    CmdsHelp(CommandTable);
+    return PM3_SUCCESS;
+}
+
+int CmdLFVerichip(const char *Cmd) {
+    clearCommandBuffer();
+    return CmdsParse(CommandTable, Cmd);
+}
+
+// by marshmellow
+// find PAC preamble in already demoded data
+int detectVerichip(uint8_t *dest, size_t *size) {
+    if (*size < 128) return -1; //make sure buffer has data
+    size_t startIdx = 0;
+    uint8_t preamble[] = {1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0};
+    if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
+        return -2; //preamble not found
+    if (*size != 128) return -3; //wrong demoded size
+    //return start position
+    return (int)startIdx;
+}
+
+int demodVerichip(void) {
+    return CmdVerichipDemod("");
+}
+

client/cmdlfverichip.h

@@ -0,0 +1,19 @@
+//-----------------------------------------------------------------------------
+//
+// 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 Verichip tag commands
+//-----------------------------------------------------------------------------
+#ifndef CMDLFVERICHIP_H__
+#define CMDLFVERICHIP_H__
+
+#include "common.h"
+
+int CmdLFVerichip(const char *Cmd);
+
+int demodVerichip(void);
+int detectVerichip(uint8_t *dest, size_t *size);
+#endif
+