git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdhf14b.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // High frequency ISO14443B commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <stdbool.h>
  14 #include <string.h>
  15 #include <stdint.h>
  16 #include "iso14443crc.h"
  17 #include "proxmark3.h"
  18 #include "data.h"
  19 #include "graph.h"
  20 #include "util.h"
  21 #include "ui.h"
  22 #include "cmdparser.h"
  23 #include "cmdhf14b.h"
  24 #include "cmdmain.h"
  25
  26 static int CmdHelp(const char *Cmd);
  27
  28 int CmdHF14BDemod(const char *Cmd)
  29 {
  30   int i, j, iold;
  31   int isum, qsum;
  32   int outOfWeakAt;
  33   bool negateI, negateQ;
  34
  35   uint8_t data[256];
  36   int dataLen = 0;
  37
  38   // As received, the samples are pairs, correlations against I and Q
  39   // square waves. So estimate angle of initial carrier (or just
  40   // quadrant, actually), and then do the demod.
  41
  42   // First, estimate where the tag starts modulating.
  43   for (i = 0; i < GraphTraceLen; i += 2) {
  44     if (abs(GraphBuffer[i]) + abs(GraphBuffer[i + 1]) > 40) {
  45       break;
  46     }
  47   }
  48   if (i >= GraphTraceLen) {
  49     PrintAndLog("too weak to sync");
  50     return 0;
  51   }
  52   PrintAndLog("out of weak at %d", i);
  53   outOfWeakAt = i;
  54
  55   // Now, estimate the phase in the initial modulation of the tag
  56   isum = 0;
  57   qsum = 0;
  58   for (; i < (outOfWeakAt + 16); i += 2) {
  59     isum += GraphBuffer[i + 0];
  60     qsum += GraphBuffer[i + 1];
  61   }
  62   negateI = (isum < 0);
  63   negateQ = (qsum < 0);
  64
  65   // Turn the correlation pairs into soft decisions on the bit.
  66   j = 0;
  67   for (i = 0; i < GraphTraceLen / 2; i++) {
  68     int si = GraphBuffer[j];
  69     int sq = GraphBuffer[j + 1];
  70     if (negateI) si = -si;
  71     if (negateQ) sq = -sq;
  72     GraphBuffer[i] = si + sq;
  73     j += 2;
  74   }
  75   GraphTraceLen = i;
  76
  77   i = outOfWeakAt / 2;
  78   while (GraphBuffer[i] > 0 && i < GraphTraceLen)
  79     i++;
  80   if (i >= GraphTraceLen) goto demodError;
  81
  82   iold = i;
  83   while (GraphBuffer[i] < 0 && i < GraphTraceLen)
  84     i++;
  85   if (i >= GraphTraceLen) goto demodError;
  86   if ((i - iold) > 23) goto demodError;
  87
  88   PrintAndLog("make it to demod loop");
  89
  90   for (;;) {
  91     iold = i;
  92     while (GraphBuffer[i] >= 0 && i < GraphTraceLen)
  93       i++;
  94     if (i >= GraphTraceLen) goto demodError;
  95     if ((i - iold) > 6) goto demodError;
  96
  97     uint16_t shiftReg = 0;
  98     if (i + 20 >= GraphTraceLen) goto demodError;
  99
 100     for (j = 0; j < 10; j++) {
 101       int soft = GraphBuffer[i] + GraphBuffer[i + 1];
 102
 103       if (abs(soft) < (abs(isum) + abs(qsum)) / 20) {
 104         PrintAndLog("weak bit");
 105       }
 106
 107       shiftReg >>= 1;
 108       if(GraphBuffer[i] + GraphBuffer[i+1] >= 0) {
 109         shiftReg |= 0x200;
 110       }
 111
 112       i+= 2;
 113     }
 114
 115     if ((shiftReg & 0x200) && !(shiftReg & 0x001))
 116     {
 117       // valid data byte, start and stop bits okay
 118       PrintAndLog("   %02x", (shiftReg >> 1) & 0xff);
 119       data[dataLen++] = (shiftReg >> 1) & 0xff;
 120       if (dataLen >= sizeof(data)) {
 121         return 0;
 122       }
 123     } else if (shiftReg == 0x000) {
 124       // this is EOF
 125       break;
 126     } else {
 127       goto demodError;
 128     }
 129   }
 130
 131   uint8_t first, second;
 132   ComputeCrc14443(CRC_14443_B, data, dataLen-2, &first, &second);
 133   PrintAndLog("CRC: %02x %02x (%s)\n", first, second,
 134     (first == data[dataLen-2] && second == data[dataLen-1]) ?
 135       "ok" : "****FAIL****");
 136
 137   RepaintGraphWindow();
 138   return 0;
 139
 140 demodError:
 141   PrintAndLog("demod error");
 142   RepaintGraphWindow();
 143   return 0;
 144 }
 145
 146 int CmdHF14BList(const char *Cmd)
 147 {
 148         PrintAndLog("Deprecated command, use 'hf list 14b' instead");
 149         return 0;
 150 }
 151 int CmdHF14BRead(const char *Cmd)
 152 {
 153   UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_ISO_14443, {strtol(Cmd, NULL, 0), 0, 0}};
 154   SendCommand(&c);
 155   return 0;
 156 }
 157
 158 int CmdHF14Sim(const char *Cmd)
 159 {
 160   UsbCommand c={CMD_SIMULATE_TAG_ISO_14443};
 161   SendCommand(&c);
 162   return 0;
 163 }
 164
 165 int CmdHFSimlisten(const char *Cmd)
 166 {
 167   UsbCommand c = {CMD_SIMULATE_TAG_HF_LISTEN};
 168   SendCommand(&c);
 169   return 0;
 170 }
 171
 172 int CmdHF14BSnoop(const char *Cmd)
 173 {
 174   UsbCommand c = {CMD_SNOOP_ISO_14443};
 175   SendCommand(&c);
 176   return 0;
 177 }
 178
 179 /* New command to read the contents of a SRI512 tag
 180  * SRI512 tags are ISO14443-B modulated memory tags,
 181  * this command just dumps the contents of the memory
 182  */
 183 int CmdSri512Read(const char *Cmd)
 184 {
 185   UsbCommand c = {CMD_READ_SRI512_TAG, {strtol(Cmd, NULL, 0), 0, 0}};
 186   SendCommand(&c);
 187   return 0;
 188 }
 189
 190 /* New command to read the contents of a SRIX4K tag
 191  * SRIX4K tags are ISO14443-B modulated memory tags,
 192  * this command just dumps the contents of the memory/
 193  */
 194 int CmdSrix4kRead(const char *Cmd)
 195 {
 196   UsbCommand c = {CMD_READ_SRIX4K_TAG, {strtol(Cmd, NULL, 0), 0, 0}};
 197   SendCommand(&c);
 198   return 0;
 199 }
 200
 201 int CmdHF14BCmdRaw (const char *cmd) {
 202     UsbCommand resp;
 203     uint8_t *recv;
 204     UsbCommand c = {CMD_ISO_14443B_COMMAND, {0, 0, 0}}; // len,recv?
 205     uint8_t reply=1;
 206     uint8_t crc=0;
 207     uint8_t power=0;
 208     char buf[5]="";
 209     int i=0;
 210     uint8_t data[100];
 211     unsigned int datalen=0, temp;
 212     char *hexout;
 213
 214     if (strlen(cmd)<3) {
 215         PrintAndLog("Usage: hf 14b raw [-r] [-c] [-p] <0A 0B 0C ... hex>");
 216         PrintAndLog("       -r    do not read response");
 217         PrintAndLog("       -c    calculate and append CRC");
 218         PrintAndLog("       -p    leave the field on after receive");
 219         return 0;
 220     }
 221
 222     // strip
 223     while (*cmd==' ' || *cmd=='\t') cmd++;
 224
 225     while (cmd[i]!='\0') {
 226         if (cmd[i]==' ' || cmd[i]=='\t') { i++; continue; }
 227         if (cmd[i]=='-') {
 228             switch (cmd[i+1]) {
 229                 case 'r':
 230                 case 'R':
 231                     reply=0;
 232                     break;
 233                 case 'c':
 234                 case 'C':
 235                     crc=1;
 236                     break;
 237                 case 'p':
 238                 case 'P':
 239                     power=1;
 240                     break;
 241                 default:
 242                     PrintAndLog("Invalid option");
 243                     return 0;
 244             }
 245             i+=2;
 246             continue;
 247         }
 248         if ((cmd[i]>='0' && cmd[i]<='9') ||
 249             (cmd[i]>='a' && cmd[i]<='f') ||
 250             (cmd[i]>='A' && cmd[i]<='F') ) {
 251             buf[strlen(buf)+1]=0;
 252             buf[strlen(buf)]=cmd[i];
 253             i++;
 254
 255             if (strlen(buf)>=2) {
 256                 sscanf(buf,"%x",&temp);
 257                 data[datalen]=(uint8_t)(temp & 0xff);
 258                 datalen++;
 259                 *buf=0;
 260             }
 261             continue;
 262         }
 263         PrintAndLog("Invalid char on input");
 264         return 0;
 265     }
 266     if (datalen == 0)
 267     {
 268       PrintAndLog("Missing data input");
 269       return 0;
 270     }
 271     if(crc)
 272     {
 273         uint8_t first, second;
 274         ComputeCrc14443(CRC_14443_B, data, datalen, &first, &second);
 275         data[datalen++] = first;
 276         data[datalen++] = second;
 277     }
 278
 279     c.arg[0] = datalen;
 280     c.arg[1] = reply;
 281     c.arg[2] = power;
 282     memcpy(c.d.asBytes,data,datalen);
 283
 284     SendCommand(&c);
 285
 286     if (reply) {
 287         if (WaitForResponseTimeout(CMD_ACK,&resp,1000)) {
 288             recv = resp.d.asBytes;
 289             PrintAndLog("received %i octets",resp.arg[0]);
 290             if(!resp.arg[0])
 291                 return 0;
 292             hexout = (char *)malloc(resp.arg[0] * 3 + 1);
 293             if (hexout != NULL) {
 294                 uint8_t first, second;
 295                 for (int i = 0; i < resp.arg[0]; i++) { // data in hex
 296                     sprintf(&hexout[i * 3], "%02X ", recv[i]);
 297                 }
 298                 PrintAndLog("%s", hexout);
 299                 free(hexout);
 300                 ComputeCrc14443(CRC_14443_B, recv, resp.arg[0]-2, &first, &second);
 301                 if(recv[resp.arg[0]-2]==first && recv[resp.arg[0]-1]==second) {
 302                     PrintAndLog("CRC OK");
 303                 } else {
 304                     PrintAndLog("CRC failed");
 305                 }
 306             } else {
 307                 PrintAndLog("malloc failed your client has low memory?");
 308             }
 309         } else {
 310             PrintAndLog("timeout while waiting for reply.");
 311         }
 312     } // if reply
 313     return 0;
 314 }
 315
 316 int CmdHF14BWrite( const char *Cmd){
 317
 318 /*
 319  * For SRIX4K  blocks 00 - 7F
 320  * hf 14b raw -c -p 09 $srix4kwblock $srix4kwdata
 321  *
 322  * For SR512  blocks 00 - 0F
 323  * hf 14b raw -c -p 09 $sr512wblock $sr512wdata
 324  *
 325  * Special block FF =  otp_lock_reg block.
 326  * Data len 4 bytes-
 327  */
 328         char cmdp = param_getchar(Cmd, 0);
 329         uint8_t blockno = -1;
 330         uint8_t data[4] = {0x00};
 331         bool isSrix4k = true;
 332         char str[20];
 333
 334         if (strlen(Cmd) < 1 || cmdp == 'h' || cmdp == 'H') {
 335                 PrintAndLog("Usage:  hf 14b write <1|2> <BLOCK> <DATA>");
 336                 PrintAndLog("    [1 = SRIX4K]");
 337                 PrintAndLog("    [2 = SRI512]");
 338                 PrintAndLog("    [BLOCK number depends on tag, special block == FF]");
 339                 PrintAndLog("     sample: hf 14b write 1 7F 11223344");
 340                 PrintAndLog("           : hf 14b write 1 FF 11223344");
 341                 PrintAndLog("           : hf 14b write 2 15 11223344");
 342                 PrintAndLog("           : hf 14b write 2 FF 11223344");
 343                 return 0;
 344         }
 345
 346         if ( cmdp == '2' )
 347                 isSrix4k = false;
 348
 349         //blockno = param_get8(Cmd, 1);
 350
 351         if ( param_gethex(Cmd,1, &blockno, 2) ) {
 352                 PrintAndLog("Block number must include 2 HEX symbols");
 353                 return 0;
 354         }
 355
 356         if ( isSrix4k ){
 357                 if ( blockno > 0x7f && blockno != 0xff ){
 358                         PrintAndLog("Block number out of range");
 359                         return 0;
 360                 }
 361         } else {
 362                 if ( blockno > 0x0f && blockno != 0xff ){
 363                         PrintAndLog("Block number out of range");
 364                         return 0;
 365                 }
 366         }
 367
 368         if (param_gethex(Cmd, 2, data, 8)) {
 369                 PrintAndLog("Data must include 8 HEX symbols");
 370                 return 0;
 371         }
 372
 373         if ( blockno == 0xff)
 374                 PrintAndLog("[%s] Write special block %02X [ %s ]", (isSrix4k)?"SRIX4K":"SRI512" , blockno,  sprint_hex(data,4) );
 375         else
 376                 PrintAndLog("[%s] Write block %02X [ %s ]", (isSrix4k)?"SRIX4K":"SRI512", blockno,  sprint_hex(data,4) );
 377
 378         sprintf(str, "-c -p 09 %02x %02x%02x%02x%02x", blockno, data[0], data[1], data[2], data[3]);
 379
 380         CmdHF14BCmdRaw(str);
 381         return 0;
 382 }
 383
 384 static command_t CommandTable[] =
 385 {
 386   {"help",        CmdHelp,        1, "This help"},
 387   {"demod",       CmdHF14BDemod,  1, "Demodulate ISO14443 Type B from tag"},
 388   {"list",        CmdHF14BList,   0, "[Deprecated] List ISO 14443b history"},
 389   {"read",        CmdHF14BRead,   0, "Read HF tag (ISO 14443)"},
 390   {"sim",         CmdHF14Sim,     0, "Fake ISO 14443 tag"},
 391   {"simlisten",   CmdHFSimlisten, 0, "Get HF samples as fake tag"},
 392   {"snoop",       CmdHF14BSnoop,  0, "Eavesdrop ISO 14443"},
 393   {"sri512read",  CmdSri512Read,  0, "Read contents of a SRI512 tag"},
 394   {"srix4kread",  CmdSrix4kRead,  0, "Read contents of a SRIX4K tag"},
 395   {"raw",         CmdHF14BCmdRaw, 0, "Send raw hex data to tag"},
 396   {"write",       CmdHF14BWrite,  0, "Write data to a SRI512 | SRIX4K tag"},
 397   {NULL, NULL, 0, NULL}
 398 };
 399
 400 int CmdHF14B(const char *Cmd)
 401 {
 402   CmdsParse(CommandTable, Cmd);
 403   return 0;
 404 }
 405
 406 int CmdHelp(const char *Cmd)
 407 {
 408   CmdsHelp(CommandTable);
 409   return 0;
 410 }