fix another way

[proxmark3-svn] / client / cmdlfjablotron.c

//-----------------------------------------------------------------------------
//
// 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 jablotron tag commands
// Differential Biphase, RF/64, 64 bits long (complete)
//-----------------------------------------------------------------------------

#include "cmdlfjablotron.h"
#include <string.h>
#include <inttypes.h>
#include <stdbool.h>
#include "proxmark3.h"
#include "ui.h"
#include "util.h"
#include "graph.h"
#include "cmdparser.h"
#include "cmddata.h"
#include "cmdmain.h"
#include "cmdlf.h"
#include "protocols.h"  // for T55xx config register definitions
#include "lfdemod.h"    // parityTest

static int CmdHelp(const char *Cmd);

int usage_lf_jablotron_clone(void) {
        PrintAndLog("clone a Jablotron tag to a T55x7 tag.");
        PrintAndLog("Usage: lf jablotron clone [h] <card ID> <Q5>");
        PrintAndLog("Options:");
        PrintAndLog("      h          : This help");
        PrintAndLog("      <card ID>  : jablotron card ID");
        PrintAndLog("      <Q5>       : specify write to Q5 (t5555 instead of t55x7)");
        PrintAndLog("");
        PrintAndLog("Sample: lf jablotron clone 112233");
        return 0;
}

int usage_lf_jablotron_sim(void) {
        PrintAndLog("Enables simulation of jablotron card with specified card number.");
        PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
        PrintAndLog("");
        PrintAndLog("Usage:  lf jablotron sim [h] <card ID>");
        PrintAndLog("Options:");
        PrintAndLog("      h          : This help");
        PrintAndLog("      <card ID>  : jablotron card ID");
        PrintAndLog("");
        PrintAndLog("Sample: lf jablotron sim 112233");
        return 0;
}

static uint8_t jablontron_chksum(uint8_t *bits) {
        uint8_t chksum = 0;
        for (int i=16; i < 56; i += 8) {
                chksum += bytebits_to_byte(bits+i,8);
        }
        chksum ^= 0x3A; 
        return chksum;
}

int getJablotronBits(uint64_t fullcode, uint8_t *bits) {        
        //preamp
        num_to_bytebits(0xFFFF, 16, bits);

        //fullcode
        num_to_bytebits(fullcode, 40, bits+16);

        //chksum byte
        uint8_t chksum = jablontron_chksum(bits);
        num_to_bytebits(chksum, 8, bits+56);
        return 1;
}

// ASK/Diphase fc/64 (inverted Biphase)
// Note: this is not a demod, this is only a detection
// the parameter *bits needs to be demoded before call
// 0xFFFF preamble, 64bits
int JablotronDetect(uint8_t *bits, size_t *size) {
        if (*size < 64*2) return -1; //make sure buffer has enough data
        size_t startIdx = 0;
        uint8_t preamble[] = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0};
        if (preambleSearch(bits, preamble, sizeof(preamble), size, &startIdx) == 0)
                return -2; //preamble not found
        if (*size != 64) return -3; // wrong demoded size
        
        uint8_t checkchksum = jablontron_chksum(bits+startIdx);
        uint8_t crc = bytebits_to_byte(bits+startIdx+56, 8);
        if ( checkchksum != crc ) return -5;
        return (int)startIdx;
}

//see ASKDemod for what args are accepted
int CmdJablotronDemod(const char *Cmd) {

        //Differential Biphase / di-phase (inverted biphase)
        //get binary from ask wave
        if (!ASKbiphaseDemod("0 64 1 0", false)) {
                if (g_debugMode) PrintAndLog("DEBUG: Error - Jablotron ASKbiphaseDemod failed");
                return 0;
        }
        size_t size = DemodBufferLen;
        int ans = JablotronDetect(DemodBuffer, &size);
        if (ans < 0) {
                if (g_debugMode) {
                        if (ans == -1)
                                PrintAndLog("DEBUG: Error - Jablotron too few bits found");
                        else if (ans == -2)
                                PrintAndLog("DEBUG: Error - Jablotron preamble not found");
                        else if (ans == -3)
                                PrintAndLog("DEBUG: Error - Jablotron size not correct: %d", size);
                        else if (ans == -5)
                                PrintAndLog("DEBUG: Error - Jablotron checksum failed");
                        else
                                PrintAndLog("DEBUG: Error - Jablotron ans: %d", ans);
                }
                return 0;
        }

        setDemodBuf(DemodBuffer, 64, 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);

        uint64_t id = (( (uint64_t)bytebits_to_byte(DemodBuffer+16, 8) )<< 32) | bytebits_to_byte(DemodBuffer+24,32);

        PrintAndLog("Jablotron Tag Found: Card ID: %"PRIx64" :: Raw: %08X%08X", id, raw1, raw2);

        uint8_t chksum = raw2 & 0xFF;
        PrintAndLog("Checksum: %02X [OK]", chksum);

        // Printed format: 1410-nn-nnnn-nnnn    
        PrintAndLog("Printed: 1410-%02X-%04X-%04X",
                (uint8_t)(id >> 32) & 0xFF,
                (uint16_t)(id >> 16) & 0xFFFF,
                (uint16_t)id & 0xFFFF
        );
        return 1;
}

int CmdJablotronRead(const char *Cmd) {
        lf_read(true, 10000);
        return CmdJablotronDemod(Cmd);
}

int CmdJablotronClone(const char *Cmd) {

        uint64_t fullcode = 0;
        uint32_t blocks[3] = {T55x7_MODULATION_DIPHASE | T55x7_BITRATE_RF_64 | 2 << T55x7_MAXBLOCK_SHIFT, 0, 0};

        uint8_t bits[64];
        uint8_t *bs = bits;
        memset(bs, 0, sizeof(bits));

        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_jablotron_clone();

        fullcode = param_get64ex(Cmd, 0, 0, 16);

        //Q5
        if (param_getchar(Cmd, 1) == 'Q' || param_getchar(Cmd, 1) == 'q') {
                //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
                blocks[0] = T5555_MODULATION_BIPHASE | T5555_INVERT_OUTPUT | ((64-2)>>1) << T5555_BITRATE_SHIFT | 2 << T5555_MAXBLOCK_SHIFT;
        }

        // clearing the topbit needed for the preambl detection. 
        if ((fullcode & 0x7FFFFFFFFF) != fullcode) {
                fullcode &= 0x7FFFFFFFFF;
                PrintAndLog("Card Number Truncated to 39bits: %"PRIx64, fullcode);
        }

        if ( !getJablotronBits(fullcode, bs)) {
                PrintAndLog("Error with tag bitstream generation.");
                return 1;
        }

        blocks[1] = bytebits_to_byte(bs,32);
        blocks[2] = bytebits_to_byte(bs+32,32);

        PrintAndLog("Preparing to clone Jablotron to T55x7 with FullCode: %"PRIx64, fullcode);
        PrintAndLog("Blk | Data ");
        PrintAndLog("----+------------");
        PrintAndLog(" 00 | 0x%08x", blocks[0]);
        PrintAndLog(" 01 | 0x%08x", blocks[1]);
        PrintAndLog(" 02 | 0x%08x", blocks[2]);
        
        UsbCommand resp;
        UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};

        for (int i = 2; 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 CmdJablotronSim(const char *Cmd) {
        uint64_t fullcode = 0;

        char cmdp = param_getchar(Cmd, 0);
        if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_jablotron_sim();

        fullcode = param_get64ex(Cmd, 0, 0, 16);

        // clearing the topbit needed for the preambl detection. 
        if ((fullcode & 0x7FFFFFFFFF) != fullcode) {
                fullcode &= 0x7FFFFFFFFF;
                PrintAndLog("Card Number Truncated to 39bits: %"PRIx64, fullcode);
        }
        
        uint8_t clk = 64, encoding = 2, separator = 0, invert = 1;
        uint16_t arg1, arg2;
        size_t size = 64;
        arg1 = clk << 8 | encoding;
        arg2 = invert << 8 | separator;

        PrintAndLog("Simulating Jablotron - FullCode: %"PRIx64, fullcode);

        UsbCommand c = {CMD_ASK_SIM_TAG, {arg1, arg2, size}};
        getJablotronBits(fullcode, c.d.asBytes);
        clearCommandBuffer();
        SendCommand(&c);
        return 0;
}

static command_t CommandTable[] = {
        {"help",  CmdHelp,           1, "This help"},
        {"demod", CmdJablotronDemod, 1, "Attempt to read and extract tag data from the GraphBuffer"},
        {"read",  CmdJablotronRead,  0, "Attempt to read and extract tag data from the antenna"},
        {"clone", CmdJablotronClone, 0, "clone jablotron tag"},
        {"sim",   CmdJablotronSim,   0, "simulate jablotron tag"},
        {NULL, NULL, 0, NULL}
};

int CmdLFJablotron(const char *Cmd) {
        clearCommandBuffer();
        CmdsParse(CommandTable, Cmd);
        return 0;
}

int CmdHelp(const char *Cmd) {
        CmdsHelp(CommandTable);
        return 0;
}