gcc10 compiler fixes:

[proxmark3-svn] / client / cmdlfsecurakey.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 Securakey tag commands
// ASK/Manchester, RF/40, 96 bits long (unknown cs)
//-----------------------------------------------------------------------------

#include "cmdlfsecurakey.h"

#include <string.h>
#include <inttypes.h>
#include <math.h>
#include "comms.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"    // preamble test
#include "parity.h"     // for wiegand parity test

static int CmdHelp(const char *Cmd);

// by marshmellow
// find Securakey preamble in already demoded data
int SecurakeyFind(uint8_t *dest, size_t *size) {
        if (*size < 96) return -1; //make sure buffer has data
        size_t startIdx = 0;
        uint8_t preamble[] = {0,1,1,1,1,1,1,1,1,1,0,0,1};
        if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
                return -2; //preamble not found
        if (*size != 96) return -3; //wrong demoded size
        //return start position
        return (int)startIdx;
}

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

        //ASK / Manchester
        bool st = false;
        if (!ASKDemod_ext("40 0 0", false, false, 1, &st)) {
                if (g_debugMode) PrintAndLog("DEBUG: Error - Securakey: ASK/Manchester Demod failed");
                return 0;
        }
        if (st) return 0;
        size_t size = DemodBufferLen;
        int ans = SecurakeyFind(DemodBuffer, &size);
        if (ans < 0) {
                if (g_debugMode) {
                        if (ans == -1)
                                PrintAndLog("DEBUG: Error - Securakey: too few bits found");
                        else if (ans == -2)
                                PrintAndLog("DEBUG: Error - Securakey: preamble not found");
                        else if (ans == -3)
                                PrintAndLog("DEBUG: Error - Securakey: Size not correct: %d", size);
                        else
                                PrintAndLog("DEBUG: Error - Securakey: ans: %d", ans);
                }
                return 0;
        }
        setDemodBuf(DemodBuffer, 96, 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);

        // 26 bit format
        // preamble     ??bitlen   reserved        EPx   xxxxxxxy   yyyyyyyy   yyyyyyyOP  CS?        CS2?
        // 0111111111 0 01011010 0 00000000 0 00000010 0 00110110 0 00111110 0 01100010 0 00001111 0 01100000 0 00000000 0 0000

        // 32 bit format
        // preamble     ??bitlen   reserved  EPxxxxxxx   xxxxxxxy   yyyyyyyy   yyyyyyyOP  CS?        CS2?
        // 0111111111 0 01100000 0 00000000 0 10000100 0 11001010 0 01011011 0 01010110 0 00010110 0 11100000 0 00000000 0 0000

        // x = FC?
        // y = card #
        // standard wiegand parities.
        // unknown checksum 11 bits? at the end
        uint8_t bits_no_spacer[85];
        memcpy(bits_no_spacer, DemodBuffer + 11, 85);

        // remove marker bits (0's every 9th digit after preamble) (pType = 3 (always 0s))
        size = removeParity(bits_no_spacer, 0, 9, 3, 85);
        if ( size != 85-9 ) {
                if (g_debugMode) PrintAndLog("DEBUG: Error removeParity: %d", size);
                return 0;
        }

        uint8_t bitLen = (uint8_t)bytebits_to_byte(bits_no_spacer+2, 6);
        uint32_t fc=0, lWiegand=0, rWiegand=0;
        if (bitLen > 40) { //securakey's max bitlen is 40 bits...
                if (g_debugMode) PrintAndLog("DEBUG: Error bitLen too long: %u", bitLen);
                return 0;
        }
        // get left 1/2 wiegand & right 1/2 wiegand (for parity test and wiegand print)
        lWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen, bitLen/2);
        rWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen + bitLen/2, bitLen/2);
        // get FC
        fc = bytebits_to_byte(bits_no_spacer+49-bitLen, bitLen-2-16);

        // test bitLen
        if (bitLen != 26 && bitLen != 32)
                PrintAndLog("***unknown securakey bitLen - share with forum***");

        uint32_t cardid = bytebits_to_byte(bits_no_spacer+8+23, 16);
        // test parities - evenparity32 looks to add an even parity returns 0 if already even...
        bool parity = !evenparity32(lWiegand) && !oddparity32(rWiegand);

        PrintAndLog("Securakey Tag Found--BitLen: %u, Card ID: %u, FC: 0x%X, Raw: %08X%08X%08X", bitLen, cardid, fc, raw1 ,raw2, raw3);
        if (bitLen <= 32)
                PrintAndLog("Wiegand: %08X, Parity: %s", (lWiegand<<(bitLen/2)) | rWiegand, parity ? "Passed" : "Failed");
        PrintAndLog("\nHow the FC translates to printed FC is unknown");
        PrintAndLog("How the checksum is calculated is unknown");
        PrintAndLog("Help the community identify this format further\n by sharing your tag on the pm3 forum or with forum members");
        return 1;
}

int CmdSecurakeyRead(const char *Cmd) {
        lf_read(true, 8000);
        return CmdSecurakeyDemod(Cmd);
}

static command_t CommandTable[] = {
        {"help",  CmdHelp,          1, "This help"},
        {"demod", CmdSecurakeyDemod,1, "Attempt to read and extract tag data from the GraphBuffer"},
        {"read",  CmdSecurakeyRead, 0, "Attempt to read and extract tag data from the antenna"},
    {NULL, NULL, 0, NULL}
};

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

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