mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-09-21 15:56:21 +08:00
84871873a4
adjusted lf demod thresholds based on additional testing fixed bug in hid bit length calc in cmddata.c fixed bugs in lf search
639 lines
16 KiB
C
639 lines
16 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Low frequency commands
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//-----------------------------------------------------------------------------
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include "proxmark3.h"
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#include "data.h"
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#include "graph.h"
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#include "ui.h"
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#include "cmdparser.h"
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#include "cmdmain.h"
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#include "cmddata.h"
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#include "util.h"
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#include "cmdlf.h"
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#include "cmdlfhid.h"
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#include "cmdlfti.h"
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#include "cmdlfem4x.h"
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#include "cmdlfhitag.h"
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#include "cmdlft55xx.h"
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#include "cmdlfpcf7931.h"
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#include "cmdlfio.h"
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static int CmdHelp(const char *Cmd);
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/* send a command before reading */
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int CmdLFCommandRead(const char *Cmd)
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{
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static char dummy[3];
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dummy[0]= ' ';
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UsbCommand c = {CMD_MOD_THEN_ACQUIRE_RAW_ADC_SAMPLES_125K};
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sscanf(Cmd, "%"lli" %"lli" %"lli" %s %s", &c.arg[0], &c.arg[1], &c.arg[2],(char*)(&c.d.asBytes),(char*)(&dummy+1));
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// in case they specified 'h'
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strcpy((char *)&c.d.asBytes + strlen((char *)c.d.asBytes), dummy);
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SendCommand(&c);
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return 0;
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}
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int CmdFlexdemod(const char *Cmd)
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{
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int i;
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for (i = 0; i < GraphTraceLen; ++i) {
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if (GraphBuffer[i] < 0) {
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GraphBuffer[i] = -1;
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} else {
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GraphBuffer[i] = 1;
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}
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}
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#define LONG_WAIT 100
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int start;
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for (start = 0; start < GraphTraceLen - LONG_WAIT; start++) {
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int first = GraphBuffer[start];
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for (i = start; i < start + LONG_WAIT; i++) {
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if (GraphBuffer[i] != first) {
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break;
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}
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}
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if (i == (start + LONG_WAIT)) {
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break;
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}
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}
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if (start == GraphTraceLen - LONG_WAIT) {
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PrintAndLog("nothing to wait for");
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return 0;
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}
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GraphBuffer[start] = 2;
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GraphBuffer[start+1] = -2;
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uint8_t bits[64] = {0x00};
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int bit, sum;
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i = start;
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for (bit = 0; bit < 64; bit++) {
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sum = 0;
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for (int j = 0; j < 16; j++) {
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sum += GraphBuffer[i++];
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}
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bits[bit] = (sum > 0) ? 1 : 0;
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PrintAndLog("bit %d sum %d", bit, sum);
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}
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for (bit = 0; bit < 64; bit++) {
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int j;
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int sum = 0;
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for (j = 0; j < 16; j++) {
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sum += GraphBuffer[i++];
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}
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if (sum > 0 && bits[bit] != 1) {
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PrintAndLog("oops1 at %d", bit);
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}
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if (sum < 0 && bits[bit] != 0) {
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PrintAndLog("oops2 at %d", bit);
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}
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}
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// HACK writing back to graphbuffer.
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GraphTraceLen = 32*64;
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i = 0;
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int phase = 0;
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for (bit = 0; bit < 64; bit++) {
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phase = (bits[bit] == 0) ? 0 : 1;
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int j;
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for (j = 0; j < 32; j++) {
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GraphBuffer[i++] = phase;
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phase = !phase;
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}
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}
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RepaintGraphWindow();
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return 0;
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}
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int CmdIndalaDemod(const char *Cmd)
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{
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// Usage: recover 64bit UID by default, specify "224" as arg to recover a 224bit UID
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int state = -1;
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int count = 0;
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int i, j;
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// worst case with GraphTraceLen=64000 is < 4096
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// under normal conditions it's < 2048
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uint8_t rawbits[4096];
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int rawbit = 0;
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int worst = 0, worstPos = 0;
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// PrintAndLog("Expecting a bit less than %d raw bits", GraphTraceLen / 32);
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for (i = 0; i < GraphTraceLen-1; i += 2) {
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count += 1;
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if ((GraphBuffer[i] > GraphBuffer[i + 1]) && (state != 1)) {
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if (state == 0) {
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for (j = 0; j < count - 8; j += 16) {
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rawbits[rawbit++] = 0;
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}
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if ((abs(count - j)) > worst) {
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worst = abs(count - j);
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worstPos = i;
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}
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}
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state = 1;
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count = 0;
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} else if ((GraphBuffer[i] < GraphBuffer[i + 1]) && (state != 0)) {
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if (state == 1) {
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for (j = 0; j < count - 8; j += 16) {
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rawbits[rawbit++] = 1;
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}
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if ((abs(count - j)) > worst) {
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worst = abs(count - j);
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worstPos = i;
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}
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}
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state = 0;
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count = 0;
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}
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}
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if (rawbit>0){
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PrintAndLog("Recovered %d raw bits, expected: %d", rawbit, GraphTraceLen/32);
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PrintAndLog("worst metric (0=best..7=worst): %d at pos %d", worst, worstPos);
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} else {
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return 0;
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}
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// Finding the start of a UID
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int uidlen, long_wait;
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if (strcmp(Cmd, "224") == 0) {
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uidlen = 224;
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long_wait = 30;
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} else {
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uidlen = 64;
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long_wait = 29;
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}
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int start;
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int first = 0;
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for (start = 0; start <= rawbit - uidlen; start++) {
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first = rawbits[start];
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for (i = start; i < start + long_wait; i++) {
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if (rawbits[i] != first) {
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break;
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}
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}
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if (i == (start + long_wait)) {
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break;
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}
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}
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if (start == rawbit - uidlen + 1) {
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PrintAndLog("nothing to wait for");
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return 0;
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}
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// Inverting signal if needed
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if (first == 1) {
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for (i = start; i < rawbit; i++) {
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rawbits[i] = !rawbits[i];
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}
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}
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// Dumping UID
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uint8_t bits[224] = {0x00};
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char showbits[225] = {0x00};
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int bit;
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i = start;
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int times = 0;
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if (uidlen > rawbit) {
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PrintAndLog("Warning: not enough raw bits to get a full UID");
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for (bit = 0; bit < rawbit; bit++) {
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bits[bit] = rawbits[i++];
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// As we cannot know the parity, let's use "." and "/"
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showbits[bit] = '.' + bits[bit];
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}
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showbits[bit+1]='\0';
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PrintAndLog("Partial UID=%s", showbits);
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return 0;
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} else {
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for (bit = 0; bit < uidlen; bit++) {
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bits[bit] = rawbits[i++];
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showbits[bit] = '0' + bits[bit];
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}
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times = 1;
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}
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//convert UID to HEX
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uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7;
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int idx;
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uid1 = uid2 = 0;
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if (uidlen==64){
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for( idx=0; idx<64; idx++) {
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if (showbits[idx] == '0') {
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uid1=(uid1<<1)|(uid2>>31);
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uid2=(uid2<<1)|0;
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} else {
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uid1=(uid1<<1)|(uid2>>31);
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uid2=(uid2<<1)|1;
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}
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}
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PrintAndLog("UID=%s (%x%08x)", showbits, uid1, uid2);
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}
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else {
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uid3 = uid4 = uid5 = uid6 = uid7 = 0;
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for( idx=0; idx<224; idx++) {
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uid1=(uid1<<1)|(uid2>>31);
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uid2=(uid2<<1)|(uid3>>31);
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uid3=(uid3<<1)|(uid4>>31);
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uid4=(uid4<<1)|(uid5>>31);
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uid5=(uid5<<1)|(uid6>>31);
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uid6=(uid6<<1)|(uid7>>31);
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if (showbits[idx] == '0')
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uid7 = (uid7<<1) | 0;
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else
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uid7 = (uid7<<1) | 1;
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}
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PrintAndLog("UID=%s (%x%08x%08x%08x%08x%08x%08x)", showbits, uid1, uid2, uid3, uid4, uid5, uid6, uid7);
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}
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// Checking UID against next occurrences
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int failed = 0;
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for (; i + uidlen <= rawbit;) {
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failed = 0;
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for (bit = 0; bit < uidlen; bit++) {
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if (bits[bit] != rawbits[i++]) {
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failed = 1;
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break;
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}
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}
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if (failed == 1) {
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break;
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}
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times += 1;
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}
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PrintAndLog("Occurrences: %d (expected %d)", times, (rawbit - start) / uidlen);
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// Remodulating for tag cloning
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// HACK: 2015-01-04 this will have an impact on our new way of seening lf commands (demod)
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// since this changes graphbuffer data.
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GraphTraceLen = 32*uidlen;
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i = 0;
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int phase = 0;
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for (bit = 0; bit < uidlen; bit++) {
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if (bits[bit] == 0) {
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phase = 0;
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} else {
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phase = 1;
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}
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int j;
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for (j = 0; j < 32; j++) {
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GraphBuffer[i++] = phase;
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phase = !phase;
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}
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}
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RepaintGraphWindow();
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return 1;
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}
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int CmdIndalaClone(const char *Cmd)
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{
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UsbCommand c;
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unsigned int uid1, uid2, uid3, uid4, uid5, uid6, uid7;
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uid1 = uid2 = uid3 = uid4 = uid5 = uid6 = uid7 = 0;
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int n = 0, i = 0;
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if (strchr(Cmd,'l') != 0) {
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while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
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uid1 = (uid1 << 4) | (uid2 >> 28);
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uid2 = (uid2 << 4) | (uid3 >> 28);
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uid3 = (uid3 << 4) | (uid4 >> 28);
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uid4 = (uid4 << 4) | (uid5 >> 28);
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uid5 = (uid5 << 4) | (uid6 >> 28);
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uid6 = (uid6 << 4) | (uid7 >> 28);
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uid7 = (uid7 << 4) | (n & 0xf);
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}
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PrintAndLog("Cloning 224bit tag with UID %x%08x%08x%08x%08x%08x%08x", uid1, uid2, uid3, uid4, uid5, uid6, uid7);
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c.cmd = CMD_INDALA_CLONE_TAG_L;
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c.d.asDwords[0] = uid1;
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c.d.asDwords[1] = uid2;
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c.d.asDwords[2] = uid3;
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c.d.asDwords[3] = uid4;
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c.d.asDwords[4] = uid5;
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c.d.asDwords[5] = uid6;
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c.d.asDwords[6] = uid7;
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} else {
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while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
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uid1 = (uid1 << 4) | (uid2 >> 28);
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uid2 = (uid2 << 4) | (n & 0xf);
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}
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PrintAndLog("Cloning 64bit tag with UID %x%08x", uid1, uid2);
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c.cmd = CMD_INDALA_CLONE_TAG;
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c.arg[0] = uid1;
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c.arg[1] = uid2;
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}
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SendCommand(&c);
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return 0;
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}
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int CmdLFRead(const char *Cmd)
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{
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UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_125K};
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// 'h' means higher-low-frequency, 134 kHz
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if(*Cmd == 'h') {
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c.arg[0] = 1;
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} else if (*Cmd == '\0') {
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c.arg[0] = 0;
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} else if (sscanf(Cmd, "%"lli, &c.arg[0]) != 1) {
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PrintAndLog("Samples 1: 'lf read'");
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PrintAndLog(" 2: 'lf read h'");
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PrintAndLog(" 3: 'lf read <divisor>'");
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return 0;
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}
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SendCommand(&c);
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WaitForResponse(CMD_ACK,NULL);
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return 0;
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}
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static void ChkBitstream(const char *str)
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{
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int i;
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/* convert to bitstream if necessary */
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for (i = 0; i < (int)(GraphTraceLen / 2); i++){
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if (GraphBuffer[i] > 1 || GraphBuffer[i] < 0) {
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CmdBitstream(str);
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break;
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}
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}
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}
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int CmdLFSim(const char *Cmd)
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{
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int i,j;
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static int gap;
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sscanf(Cmd, "%i", &gap);
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/* convert to bitstream if necessary */
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ChkBitstream(Cmd);
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printf("Sending [%d bytes]", GraphTraceLen);
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for (i = 0; i < GraphTraceLen; i += USB_CMD_DATA_SIZE) {
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UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {i, 0, 0}};
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for (j = 0; j < USB_CMD_DATA_SIZE; j++) {
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c.d.asBytes[j] = GraphBuffer[i+j];
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}
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SendCommand(&c);
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WaitForResponse(CMD_ACK,NULL);
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printf(".");
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}
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printf("\n");
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PrintAndLog("Starting to simulate");
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UsbCommand c = {CMD_SIMULATE_TAG_125K, {GraphTraceLen, gap, 0}};
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SendCommand(&c);
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return 0;
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}
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int CmdLFSimBidir(const char *Cmd)
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{
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// Set ADC to twice the carrier for a slight supersampling
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// HACK: not implemented in ARMSRC.
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PrintAndLog("Not implemented yet.");
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UsbCommand c = {CMD_LF_SIMULATE_BIDIR, {47, 384, 0}};
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SendCommand(&c);
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return 0;
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}
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/* simulate an LF Manchester encoded tag with specified bitstream, clock rate and inter-id gap */
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int CmdLFSimManchester(const char *Cmd)
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{
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static int clock, gap;
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static char data[1024], gapstring[8];
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sscanf(Cmd, "%i %s %i", &clock, &data[0], &gap);
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ClearGraph(0);
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for (int i = 0; i < strlen(data) ; ++i)
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AppendGraph(0, clock, data[i]- '0');
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CmdManchesterMod("");
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RepaintGraphWindow();
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sprintf(&gapstring[0], "%i", gap);
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CmdLFSim(gapstring);
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return 0;
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}
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int CmdLFSnoop(const char *Cmd)
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{
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UsbCommand c = {CMD_LF_SNOOP_RAW_ADC_SAMPLES};
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// 'h' means higher-low-frequency, 134 kHz
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c.arg[0] = 0;
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c.arg[1] = -1;
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if (*Cmd == 'l') {
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sscanf(Cmd, "l %"lli, &c.arg[1]);
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} else if(*Cmd == 'h') {
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c.arg[0] = 1;
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sscanf(Cmd, "h %"lli, &c.arg[1]);
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} else if (sscanf(Cmd, "%"lli" %"lli, &c.arg[0], &c.arg[1]) < 1) {
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PrintAndLog("usage 1: snoop");
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PrintAndLog(" 2: snoop {l,h} [trigger threshold]");
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PrintAndLog(" 3: snoop <divisor> [trigger threshold]");
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return 0;
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}
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SendCommand(&c);
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WaitForResponse(CMD_ACK,NULL);
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return 0;
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}
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int CmdVchDemod(const char *Cmd)
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{
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// Is this the entire sync pattern, or does this also include some
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// data bits that happen to be the same everywhere? That would be
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// lovely to know.
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static const int SyncPattern[] = {
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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};
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// So first, we correlate for the sync pattern, and mark that.
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int bestCorrel = 0, bestPos = 0;
|
|
int i;
|
|
// It does us no good to find the sync pattern, with fewer than
|
|
// 2048 samples after it...
|
|
for (i = 0; i < (GraphTraceLen-2048); i++) {
|
|
int sum = 0;
|
|
int j;
|
|
for (j = 0; j < arraylen(SyncPattern); j++) {
|
|
sum += GraphBuffer[i+j]*SyncPattern[j];
|
|
}
|
|
if (sum > bestCorrel) {
|
|
bestCorrel = sum;
|
|
bestPos = i;
|
|
}
|
|
}
|
|
PrintAndLog("best sync at %d [metric %d]", bestPos, bestCorrel);
|
|
|
|
char bits[257];
|
|
bits[256] = '\0';
|
|
|
|
int worst = INT_MAX;
|
|
int worstPos = 0;
|
|
|
|
for (i = 0; i < 2048; i += 8) {
|
|
int sum = 0;
|
|
int j;
|
|
for (j = 0; j < 8; j++) {
|
|
sum += GraphBuffer[bestPos+i+j];
|
|
}
|
|
if (sum < 0) {
|
|
bits[i/8] = '.';
|
|
} else {
|
|
bits[i/8] = '1';
|
|
}
|
|
if(abs(sum) < worst) {
|
|
worst = abs(sum);
|
|
worstPos = i;
|
|
}
|
|
}
|
|
PrintAndLog("bits:");
|
|
PrintAndLog("%s", bits);
|
|
PrintAndLog("worst metric: %d at pos %d", worst, worstPos);
|
|
|
|
if (strcmp(Cmd, "clone")==0) {
|
|
GraphTraceLen = 0;
|
|
char *s;
|
|
for(s = bits; *s; s++) {
|
|
int j;
|
|
for(j = 0; j < 16; j++) {
|
|
GraphBuffer[GraphTraceLen++] = (*s == '1') ? 1 : 0;
|
|
}
|
|
}
|
|
RepaintGraphWindow();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
//by marshmellow
|
|
int CmdLFfind(const char *Cmd)
|
|
{
|
|
int ans=0;
|
|
char cmdp = param_getchar(Cmd, 0);
|
|
|
|
if (strlen(Cmd) > 1 || cmdp == 'h' || cmdp == 'H') {
|
|
PrintAndLog("Usage: lf search <0|1>");
|
|
PrintAndLog(" <use data from Graphbuffer>, if not set, try reading data from tag.");
|
|
PrintAndLog("");
|
|
PrintAndLog(" sample: lf search");
|
|
PrintAndLog(" : lf search 1");
|
|
return 0;
|
|
}
|
|
|
|
if (!offline && (cmdp != '1')){
|
|
ans=CmdLFRead("");
|
|
ans=CmdSamples("20000");
|
|
} else if (GraphTraceLen < 1000) {
|
|
PrintAndLog("Data in Graphbuffer was too small.");
|
|
return 0;
|
|
}
|
|
|
|
PrintAndLog("NOTE: some demods output possible binary\n if it finds something that looks like a tag");
|
|
PrintAndLog("Checking for known tags:");
|
|
ans=CmdFSKdemodIO("");
|
|
if (ans>0) {
|
|
PrintAndLog("Valid IO Prox ID Found!");
|
|
return 1;
|
|
}
|
|
ans=CmdFSKdemodHID("");
|
|
if (ans>0) {
|
|
PrintAndLog("Valid HID Prox ID Found!");
|
|
return 1;
|
|
}
|
|
//add psk and indala
|
|
ans=CmdIndalaDecode("0");
|
|
if (ans>0) {
|
|
PrintAndLog("Valid Indala ID Found!");
|
|
return 1;
|
|
}
|
|
ans=Cmdaskmandemod("");
|
|
if (ans>0) {
|
|
PrintAndLog("Valid EM410x ID Found!");
|
|
return 1;
|
|
}
|
|
PrintAndLog("No Known Tags Found!\n");
|
|
return 0;
|
|
}
|
|
|
|
static command_t CommandTable[] =
|
|
{
|
|
{"help", CmdHelp, 1, "This help"},
|
|
{"cmdread", CmdLFCommandRead, 0, "<off period> <'0' period> <'1' period> <command> ['h'] -- Modulate LF reader field to send command before read (all periods in microseconds) (option 'h' for 134)"},
|
|
{"em4x", CmdLFEM4X, 1, "{ EM4X RFIDs... }"},
|
|
{"flexdemod", CmdFlexdemod, 1, "Demodulate samples for FlexPass"},
|
|
{"hid", CmdLFHID, 1, "{ HID RFIDs... }"},
|
|
{"io", CmdLFIO, 1, "{ ioProx tags... }"},
|
|
{"indalademod", CmdIndalaDemod, 1, "['224'] -- Demodulate samples for Indala 64 bit UID (option '224' for 224 bit)"},
|
|
{"indalaclone", CmdIndalaClone, 0, "<UID> ['l']-- Clone Indala to T55x7 (tag must be in antenna)(UID in HEX)(option 'l' for 224 UID"},
|
|
{"read", CmdLFRead, 0, "['h' or <divisor>] -- Read 125/134 kHz LF ID-only tag (option 'h' for 134, alternatively: f=12MHz/(divisor+1))"},
|
|
{"search", CmdLFfind, 1, "Read and Search for valid known tag (in offline mode it you can load first then search)"},
|
|
{"sim", CmdLFSim, 0, "[GAP] -- Simulate LF tag from buffer with optional GAP (in microseconds)"},
|
|
{"simbidir", CmdLFSimBidir, 0, "Simulate LF tag (with bidirectional data transmission between reader and tag)"},
|
|
{"simman", CmdLFSimManchester, 0, "<Clock> <Bitstream> [GAP] Simulate arbitrary Manchester LF tag"},
|
|
{"snoop", CmdLFSnoop, 0, "['l'|'h'|<divisor>] [trigger threshold]-- Snoop LF (l:125khz, h:134khz)"},
|
|
{"ti", CmdLFTI, 1, "{ TI RFIDs... }"},
|
|
{"hitag", CmdLFHitag, 1, "{ Hitag tags and transponders... }"},
|
|
{"vchdemod", CmdVchDemod, 1, "['clone'] -- Demodulate samples for VeriChip"},
|
|
{"t55xx", CmdLFT55XX, 1, "{ T55xx RFIDs... }"},
|
|
{"pcf7931", CmdLFPCF7931, 1, "{PCF7931 RFIDs...}"},
|
|
{NULL, NULL, 0, NULL}
|
|
};
|
|
|
|
int CmdLF(const char *Cmd)
|
|
{
|
|
CmdsParse(CommandTable, Cmd);
|
|
return 0;
|
|
}
|
|
|
|
int CmdHelp(const char *Cmd)
|
|
{
|
|
CmdsHelp(CommandTable);
|
|
return 0;
|
|
}
|