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proxmark3/client/cmdhf14b.c

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//-----------------------------------------------------------------------------
// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// 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.
//-----------------------------------------------------------------------------
// High frequency ISO14443B commands
//-----------------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <stdint.h>
#include "iso14443crc.h"
//#include "proxusb.h"
#include "proxmark3.h"
#include "data.h"
#include "graph.h"
#include "ui.h"
#include "cmdparser.h"
#include "cmdhf14b.h"
#include "cmdmain.h"
static int CmdHelp(const char *Cmd);
int CmdHF14BDemod(const char *Cmd)
{
int i, j, iold;
int isum, qsum;
int outOfWeakAt;
bool negateI, negateQ;
uint8_t data[256];
int dataLen = 0;
// As received, the samples are pairs, correlations against I and Q
// square waves. So estimate angle of initial carrier (or just
// quadrant, actually), and then do the demod.
// First, estimate where the tag starts modulating.
for (i = 0; i < GraphTraceLen; i += 2) {
if (abs(GraphBuffer[i]) + abs(GraphBuffer[i + 1]) > 40) {
break;
}
}
if (i >= GraphTraceLen) {
PrintAndLog("too weak to sync");
return 0;
}
PrintAndLog("out of weak at %d", i);
outOfWeakAt = i;
// Now, estimate the phase in the initial modulation of the tag
isum = 0;
qsum = 0;
for (; i < (outOfWeakAt + 16); i += 2) {
isum += GraphBuffer[i + 0];
qsum += GraphBuffer[i + 1];
}
negateI = (isum < 0);
negateQ = (qsum < 0);
// Turn the correlation pairs into soft decisions on the bit.
j = 0;
for (i = 0; i < GraphTraceLen / 2; i++) {
int si = GraphBuffer[j];
int sq = GraphBuffer[j + 1];
if (negateI) si = -si;
if (negateQ) sq = -sq;
GraphBuffer[i] = si + sq;
j += 2;
}
GraphTraceLen = i;
i = outOfWeakAt / 2;
while (GraphBuffer[i] > 0 && i < GraphTraceLen)
i++;
if (i >= GraphTraceLen) goto demodError;
iold = i;
while (GraphBuffer[i] < 0 && i < GraphTraceLen)
i++;
if (i >= GraphTraceLen) goto demodError;
if ((i - iold) > 23) goto demodError;
PrintAndLog("make it to demod loop");
for (;;) {
iold = i;
while (GraphBuffer[i] >= 0 && i < GraphTraceLen)
i++;
if (i >= GraphTraceLen) goto demodError;
if ((i - iold) > 6) goto demodError;
uint16_t shiftReg = 0;
if (i + 20 >= GraphTraceLen) goto demodError;
for (j = 0; j < 10; j++) {
int soft = GraphBuffer[i] + GraphBuffer[i + 1];
if (abs(soft) < (abs(isum) + abs(qsum)) / 20) {
PrintAndLog("weak bit");
}
shiftReg >>= 1;
if(GraphBuffer[i] + GraphBuffer[i+1] >= 0) {
shiftReg |= 0x200;
}
i+= 2;
}
if ((shiftReg & 0x200) && !(shiftReg & 0x001))
{
// valid data byte, start and stop bits okay
PrintAndLog(" %02x", (shiftReg >> 1) & 0xff);
data[dataLen++] = (shiftReg >> 1) & 0xff;
if (dataLen >= sizeof(data)) {
return 0;
}
} else if (shiftReg == 0x000) {
// this is EOF
break;
} else {
goto demodError;
}
}
uint8_t first, second;
ComputeCrc14443(CRC_14443_B, data, dataLen-2, &first, &second);
PrintAndLog("CRC: %02x %02x (%s)\n", first, second,
(first == data[dataLen-2] && second == data[dataLen-1]) ?
"ok" : "****FAIL****");
RepaintGraphWindow();
return 0;
demodError:
PrintAndLog("demod error");
RepaintGraphWindow();
return 0;
}
int CmdHF14BList(const char *Cmd)
{
uint8_t got[960];
GetFromBigBuf(got,sizeof(got),0);
WaitForResponse(CMD_ACK,NULL);
PrintAndLog("recorded activity:");
PrintAndLog(" time :rssi: who bytes");
PrintAndLog("---------+----+----+-----------");
int i = 0;
int prev = -1;
for(;;) {
if(i >= 900) {
break;
}
bool isResponse;
int timestamp = *((uint32_t *)(got+i));
if(timestamp & 0x80000000) {
timestamp &= 0x7fffffff;
isResponse = 1;
} else {
isResponse = 0;
}
int metric = *((uint32_t *)(got+i+4));
int len = got[i+8];
if(len > 100) {
break;
}
if(i + len >= 900) {
break;
}
uint8_t *frame = (got+i+9);
char line[1000] = "";
int j;
for(j = 0; j < len; j++) {
sprintf(line+(j*3), "%02x ", frame[j]);
}
char *crc;
if(len > 2) {
uint8_t b1, b2;
ComputeCrc14443(CRC_14443_B, frame, len-2, &b1, &b2);
if(b1 != frame[len-2] || b2 != frame[len-1]) {
crc = "**FAIL CRC**";
} else {
crc = "";
}
} else {
crc = "(SHORT)";
}
char metricString[100];
if(isResponse) {
sprintf(metricString, "%3d", metric);
} else {
strcpy(metricString, " ");
}
PrintAndLog(" +%7d: %s: %s %s %s",
(prev < 0 ? 0 : timestamp - prev),
metricString,
(isResponse ? "TAG" : " "), line, crc);
prev = timestamp;
i += (len + 9);
}
return 0;
}
int CmdHF14BRead(const char *Cmd)
{
UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_ISO_14443, {strtol(Cmd, NULL, 0), 0, 0}};
SendCommand(&c);
return 0;
}
int CmdHF14Sim(const char *Cmd)
{
UsbCommand c={CMD_SIMULATE_TAG_ISO_14443};
SendCommand(&c);
return 0;
}
int CmdHFSimlisten(const char *Cmd)
{
UsbCommand c = {CMD_SIMULATE_TAG_HF_LISTEN};
SendCommand(&c);
return 0;
}
int CmdHF14BSnoop(const char *Cmd)
{
UsbCommand c = {CMD_SNOOP_ISO_14443};
SendCommand(&c);
return 0;
}
/* New command to read the contents of a SRI512 tag
* SRI512 tags are ISO14443-B modulated memory tags,
* this command just dumps the contents of the memory
*/
int CmdSri512Read(const char *Cmd)
{
UsbCommand c = {CMD_READ_SRI512_TAG, {strtol(Cmd, NULL, 0), 0, 0}};
SendCommand(&c);
return 0;
}
/* New command to read the contents of a SRIX4K tag
* SRIX4K tags are ISO14443-B modulated memory tags,
* this command just dumps the contents of the memory/
*/
int CmdSrix4kRead(const char *Cmd)
{
UsbCommand c = {CMD_READ_SRIX4K_TAG, {strtol(Cmd, NULL, 0), 0, 0}};
SendCommand(&c);
return 0;
}
int CmdHF14BCmdRaw (const char *cmd) {
UsbCommand resp;
uint8_t *recv;
UsbCommand c = {CMD_ISO_14443B_COMMAND, {0, 0, 0}}; // len,recv?
uint8_t reply=1;
uint8_t crc=0;
uint8_t power=0;
char buf[5]="";
int i=0;
uint8_t data[100];
unsigned int datalen=0, temp;
char *hexout;
if (strlen(cmd)<3) {
PrintAndLog("Usage: hf 14b raw [-r] [-c] [-p] <0A 0B 0C ... hex>");
PrintAndLog(" -r do not read response");
PrintAndLog(" -c calculate and append CRC");
PrintAndLog(" -p leave the field on after receive");
return 0;
}
// strip
while (*cmd==' ' || *cmd=='\t') cmd++;
while (cmd[i]!='\0') {
if (cmd[i]==' ' || cmd[i]=='\t') { i++; continue; }
if (cmd[i]=='-') {
switch (cmd[i+1]) {
case 'r':
case 'R':
reply=0;
break;
case 'c':
case 'C':
crc=1;
break;
case 'p':
case 'P':
power=1;
break;
default:
PrintAndLog("Invalid option");
return 0;
}
i+=2;
continue;
}
if ((cmd[i]>='0' && cmd[i]<='9') ||
(cmd[i]>='a' && cmd[i]<='f') ||
(cmd[i]>='A' && cmd[i]<='F') ) {
buf[strlen(buf)+1]=0;
buf[strlen(buf)]=cmd[i];
i++;
if (strlen(buf)>=2) {
sscanf(buf,"%x",&temp);
data[datalen]=(uint8_t)(temp & 0xff);
datalen++;
*buf=0;
}
continue;
}
PrintAndLog("Invalid char on input");
return 0;
}
if(crc)
{
uint8_t first, second;
ComputeCrc14443(CRC_14443_B, data, datalen, &first, &second);
data[datalen++] = first;
data[datalen++] = second;
}
c.arg[0] = datalen;
c.arg[1] = reply;
c.arg[2] = power;
memcpy(c.d.asBytes,data,datalen);
SendCommand(&c);
if (reply) {
if (WaitForResponseTimeout(CMD_ACK,&resp,1000)) {
recv = resp.d.asBytes;
PrintAndLog("received %i octets",resp.arg[0]);
if(!resp.arg[0])
return 0;
hexout = (char *)malloc(resp.arg[0] * 3 + 1);
if (hexout != NULL) {
uint8_t first, second;
for (int i = 0; i < resp.arg[0]; i++) { // data in hex
sprintf(&hexout[i * 3], "%02hX ", recv[i]);
}
PrintAndLog("%s", hexout);
free(hexout);
ComputeCrc14443(CRC_14443_B, recv, resp.arg[0]-2, &first, &second);
if(recv[resp.arg[0]-2]==first && recv[resp.arg[0]-1]==second) {
PrintAndLog("CRC OK");
} else {
PrintAndLog("CRC failed");
}
} else {
PrintAndLog("malloc failed your client has low memory?");
}
} else {
PrintAndLog("timeout while waiting for reply.");
}
} // if reply
return 0;
}
static command_t CommandTable[] =
{
{"help", CmdHelp, 1, "This help"},
{"demod", CmdHF14BDemod, 1, "Demodulate ISO14443 Type B from tag"},
{"list", CmdHF14BList, 0, "List ISO 14443 history"},
{"read", CmdHF14BRead, 0, "Read HF tag (ISO 14443)"},
{"sim", CmdHF14Sim, 0, "Fake ISO 14443 tag"},
{"simlisten", CmdHFSimlisten, 0, "Get HF samples as fake tag"},
{"snoop", CmdHF14BSnoop, 0, "Eavesdrop ISO 14443"},
{"sri512read", CmdSri512Read, 0, "Read contents of a SRI512 tag"},
{"srix4kread", CmdSrix4kRead, 0, "Read contents of a SRIX4K tag"},
{"raw", CmdHF14BCmdRaw, 0, "Send raw hex data to tag"},
{NULL, NULL, 0, NULL}
};
int CmdHF14B(const char *Cmd)
{
CmdsParse(CommandTable, Cmd);
return 0;
}
int CmdHelp(const char *Cmd)
{
CmdsHelp(CommandTable);
return 0;
}
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