git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/mifareutil.c

   1 //-----------------------------------------------------------------------------
   2 // Merlok, May 2011, 2012
   3 // Many authors, whom made it possible
   4 //
   5 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   6 // at your option, any later version. See the LICENSE.txt file for the text of
   7 // the license.
   8 //-----------------------------------------------------------------------------
   9 // Work with mifare cards.
  10 //-----------------------------------------------------------------------------
  11
  12 #include "../include/proxmark3.h"
  13 #include "apps.h"
  14 #include "util.h"
  15 #include "string.h"
  16
  17 #include "../common/iso14443crc.h"
  18 #include "iso14443a.h"
  19 #include "crapto1.h"
  20 #include "mifareutil.h"
  21
  22 int MF_DBGLEVEL = MF_DBG_ALL;
  23
  24 // memory management
  25 uint8_t* mifare_get_bigbufptr(void) {
  26         return (((uint8_t *)BigBuf) + MIFARE_BUFF_OFFSET);      // was 3560 - tied to other size changes
  27 }
  28 uint8_t* eml_get_bigbufptr_sendbuf(void) {
  29         return (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
  30 }
  31 uint8_t* eml_get_bigbufptr_recbuf(void) {
  32         return (((uint8_t *)BigBuf) + MIFARE_BUFF_OFFSET);
  33 }
  34 uint8_t* eml_get_bigbufptr_cardmem(void) {
  35         return (((uint8_t *)BigBuf) + CARD_MEMORY);
  36 }
  37
  38 // crypto1 helpers
  39 void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len){
  40         uint8_t bt = 0;
  41         int i;
  42
  43         if (len != 1) {
  44                 for (i = 0; i < len; i++)
  45                         data[i] = crypto1_byte(pcs, 0x00, 0) ^ data[i];
  46         } else {
  47                 bt = 0;
  48                 for (i = 0; i < 4; i++)
  49                         bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data[0], i)) << i;
  50
  51                 data[0] = bt;
  52         }
  53         return;
  54 }
  55
  56 void mf_crypto1_encrypt(struct Crypto1State *pcs, uint8_t *data, int len, uint32_t *par) {
  57         uint8_t bt = 0;
  58         int i;
  59         uint32_t mltpl = 1 << (len - 1); // for len=18 it=0x20000
  60         *par = 0;
  61         for (i = 0; i < len; i++) {
  62                 bt = data[i];
  63                 data[i] = crypto1_byte(pcs, 0x00, 0) ^ data[i];
  64                 *par = (*par >> 1) | ( ((filter(pcs->odd) ^ oddparity(bt)) & 0x01) * mltpl );
  65         }
  66         return;
  67 }
  68
  69 uint8_t mf_crypto1_encrypt4bit(struct Crypto1State *pcs, uint8_t data) {
  70         uint8_t bt = 0;
  71         int i;
  72
  73         for (i = 0; i < 4; i++)
  74                 bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data, i)) << i;
  75
  76         return bt;
  77 }
  78
  79 // send commands
  80 int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer, uint32_t *timing)
  81 {
  82         return mifare_sendcmd_shortex(pcs, crypted, cmd, data, answer, NULL, timing);
  83 }
  84
  85 int mifare_sendcmd_short_special(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t* data, uint8_t* answer, uint8_t *timing)
  86 {
  87     uint8_t dcmd[8];
  88         dcmd[0] = cmd;
  89     memcpy(dcmd+1,data,5);
  90         AppendCrc14443a(dcmd, 6);
  91         ReaderTransmit(dcmd, sizeof(dcmd), NULL);
  92         int len = ReaderReceive(answer);
  93         if(!len) {
  94                 if (MF_DBGLEVEL >= 1)   Dbprintf("Authentication failed. Card timeout.");
  95                 return 2;
  96     }
  97         return len;
  98 }
  99
 100 int mifare_sendcmd_short_mfucauth(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t* data, uint8_t* answer, uint32_t *timing)
 101 {
 102     uint8_t dcmd[19];
 103         int len;
 104     dcmd[0] = cmd;
 105     memcpy(dcmd+1,data,16);
 106         AppendCrc14443a(dcmd, 17);
 107
 108         ReaderTransmit(dcmd, sizeof(dcmd), timing);
 109         len = ReaderReceive(answer);
 110         if(!len) {
 111         if (MF_DBGLEVEL >= 1)   Dbprintf("Authentication failed. Card timeout.");
 112         len = ReaderReceive(answer);
 113     }
 114     if(len==1)  {
 115                 if (MF_DBGLEVEL >= 1)   Dbprintf("NAK - Authentication failed.");
 116                 return 1;
 117         }
 118         return len;
 119 }
 120
 121 int mifare_sendcmd_shortex(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer, uint32_t * parptr, uint32_t *timing)
 122 {
 123         uint8_t dcmd[4], ecmd[4];
 124         uint32_t pos, par, res;
 125
 126         dcmd[0] = cmd;
 127         dcmd[1] = data;
 128         AppendCrc14443a(dcmd, 2);
 129
 130         memcpy(ecmd, dcmd, sizeof(dcmd));
 131
 132         if (crypted) {
 133                 par = 0;
 134                 for (pos = 0; pos < 4; pos++)
 135                 {
 136                         ecmd[pos] = crypto1_byte(pcs, 0x00, 0) ^ dcmd[pos];
 137                         par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) * 0x08 );
 138                 }
 139
 140                 ReaderTransmitPar(ecmd, sizeof(ecmd), par, timing);
 141
 142         } else {
 143                 ReaderTransmit(dcmd, sizeof(dcmd), timing);
 144         }
 145
 146         int len = ReaderReceivePar(answer, &par);
 147
 148         if (parptr) *parptr = par;
 149
 150         if (crypted == CRYPT_ALL) {
 151                 if (len == 1) {
 152                         res = 0;
 153                         for (pos = 0; pos < 4; pos++)
 154                                 res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], pos)) << pos;
 155
 156                         answer[0] = res;
 157
 158                 } else {
 159                         for (pos = 0; pos < len; pos++)
 160                         {
 161                                 answer[pos] = crypto1_byte(pcs, 0x00, 0) ^ answer[pos];
 162                         }
 163                 }
 164         }
 165
 166         return len;
 167 }
 168
 169 // mifare commands
 170 int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested)
 171 {
 172         return mifare_classic_authex(pcs, uid, blockNo, keyType, ui64Key, isNested, NULL, NULL);
 173 }
 174
 175 int mifare_classic_authex(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested, uint32_t * ntptr, uint32_t *timing)
 176 {
 177         // variables
 178         int len;
 179         uint32_t pos;
 180         uint8_t tmp4[4];
 181         byte_t par = 0;
 182         byte_t ar[4];
 183         uint32_t nt, ntpp; // Supplied tag nonce
 184
 185         uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
 186         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 187
 188         // Transmit MIFARE_CLASSIC_AUTH
 189         len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer, timing);
 190         if (MF_DBGLEVEL >= 4)   Dbprintf("rand nonce len: %x", len);
 191         if (len != 4) return 1;
 192
 193         ar[0] = 0x55;
 194         ar[1] = 0x41;
 195         ar[2] = 0x49;
 196         ar[3] = 0x92;
 197
 198         // Save the tag nonce (nt)
 199         nt = bytes_to_num(receivedAnswer, 4);
 200
 201         //  ----------------------------- crypto1 create
 202         if (isNested)
 203                 crypto1_destroy(pcs);
 204
 205         // Init cipher with key
 206         crypto1_create(pcs, ui64Key);
 207
 208         if (isNested == AUTH_NESTED) {
 209                 // decrypt nt with help of new key
 210                 nt = crypto1_word(pcs, nt ^ uid, 1) ^ nt;
 211         } else {
 212                 // Load (plain) uid^nt into the cipher
 213                 crypto1_word(pcs, nt ^ uid, 0);
 214         }
 215
 216         // some statistic
 217         if (!ntptr && (MF_DBGLEVEL >= 3))
 218                 Dbprintf("auth uid: %08x nt: %08x", uid, nt);
 219
 220         // save Nt
 221         if (ntptr)
 222                 *ntptr = nt;
 223
 224         par = 0;
 225         // Generate (encrypted) nr+parity by loading it into the cipher (Nr)
 226         for (pos = 0; pos < 4; pos++)
 227         {
 228                 mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos];
 229                 par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(ar[pos])) & 0x01) * 0x80 );
 230         }
 231
 232         // Skip 32 bits in pseudo random generator
 233         nt = prng_successor(nt,32);
 234
 235         //  ar+parity
 236         for (pos = 4; pos < 8; pos++)
 237         {
 238                 nt = prng_successor(nt,8);
 239                 mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff);
 240                 par = (par >> 1)| ( ((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) * 0x80 );
 241         }
 242
 243         // Transmit reader nonce and reader answer
 244         ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL);
 245
 246         // Receive 4 bit answer
 247         len = ReaderReceive(receivedAnswer);
 248         if (!len)
 249         {
 250                 if (MF_DBGLEVEL >= 1)   Dbprintf("Authentication failed. Card timeout.");
 251                 return 2;
 252         }
 253
 254         memcpy(tmp4, receivedAnswer, 4);
 255         ntpp = prng_successor(nt, 32) ^ crypto1_word(pcs, 0,0);
 256
 257         if (ntpp != bytes_to_num(tmp4, 4)) {
 258                 if (MF_DBGLEVEL >= 1)   Dbprintf("Authentication failed. Error card response.");
 259                 return 3;
 260         }
 261
 262         return 0;
 263 }
 264
 265 int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 266 {
 267         // variables
 268         int len;
 269         uint8_t bt[2];
 270
 271         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 272
 273         // command MIFARE_CLASSIC_READBLOCK
 274         len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer, NULL);
 275         if (len == 1) {
 276                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 277                 return 1;
 278         }
 279         if (len != 18) {
 280                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: card timeout. len: %x", len);
 281                 return 2;
 282         }
 283
 284         memcpy(bt, receivedAnswer + 16, 2);
 285         AppendCrc14443a(receivedAnswer, 16);
 286         if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) {
 287                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd CRC response error.");
 288                 return 3;
 289         }
 290
 291         memcpy(blockData, receivedAnswer, 16);
 292         return 0;
 293 }
 294
 295 int mifare_ultra_auth1(uint32_t uid, uint8_t *blockData){
 296         // variables
 297         int len;
 298
 299         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 300
 301         // command MIFARE_CLASSIC_READBLOCK
 302         len = mifare_sendcmd_short(NULL, 1, 0x1A, 0x00, receivedAnswer,NULL);
 303         if (len == 1) {
 304                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 305                 return 1;
 306         }
 307         if (len == 11) {
 308                 if (MF_DBGLEVEL >= 1)   Dbprintf("Auth1 Resp: %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
 309                   receivedAnswer[0],receivedAnswer[1],receivedAnswer[2],receivedAnswer[3],receivedAnswer[4],
 310                   receivedAnswer[5],receivedAnswer[6],receivedAnswer[7],receivedAnswer[8],receivedAnswer[9],
 311                   receivedAnswer[10]);
 312                 memcpy(blockData, receivedAnswer, 11);
 313                 return 0;
 314         }
 315         //else something went wrong???
 316         return 1;
 317 }
 318
 319 int mifare_ultra_auth2(uint32_t uid, uint8_t *key, uint8_t *blockData){
 320         // variables
 321         int len;
 322
 323         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 324
 325
 326         // command MIFARE_CLASSIC_READBLOCK
 327         len = mifare_sendcmd_short_mfucauth(NULL, 1, 0xAF, key, receivedAnswer,NULL);
 328         if (len == 1) {
 329                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 330                 return 1;
 331         }
 332         if (len == 11){
 333                 if (MF_DBGLEVEL >= 1)   Dbprintf("Auth2 Resp: %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
 334                   receivedAnswer[0],receivedAnswer[1],receivedAnswer[2],receivedAnswer[3],receivedAnswer[4],
 335                   receivedAnswer[5],receivedAnswer[6],receivedAnswer[7],receivedAnswer[8],receivedAnswer[9],
 336                   receivedAnswer[10]);
 337                 memcpy(blockData, receivedAnswer, 11);
 338                 return 0;
 339         }
 340         //something went wrong?
 341         return 1;
 342 }
 343
 344 int mifare_ultra_readblock(uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 345 {
 346         // variables
 347         int len;
 348         uint8_t bt[2];
 349
 350         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 351
 352         // command MIFARE_CLASSIC_READBLOCK
 353         len = mifare_sendcmd_short(NULL, 1, 0x30, blockNo, receivedAnswer,NULL);
 354         if (len == 1) {
 355                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 356                 return 1;
 357         }
 358         if (len != 18) {
 359                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: card timeout. len: %x", len);
 360                 return 2;
 361         }
 362
 363         memcpy(bt, receivedAnswer + 16, 2);
 364         AppendCrc14443a(receivedAnswer, 16);
 365         if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) {
 366                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd CRC response error.");
 367                 return 3;
 368         }
 369
 370         memcpy(blockData, receivedAnswer, 14);
 371         return 0;
 372 }
 373
 374
 375 int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 376 {
 377         // variables
 378         int len, i;
 379         uint32_t pos;
 380         uint32_t par = 0;
 381         byte_t res;
 382
 383         uint8_t d_block[18], d_block_enc[18];
 384         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 385
 386         // command MIFARE_CLASSIC_WRITEBLOCK
 387         len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer, NULL);
 388
 389         if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK
 390                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 391                 return 1;
 392         }
 393
 394         memcpy(d_block, blockData, 16);
 395         AppendCrc14443a(d_block, 16);
 396
 397         // crypto
 398         par = 0;
 399         for (pos = 0; pos < 18; pos++)
 400         {
 401                 d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];
 402                 par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) * 0x20000 );
 403         }
 404
 405         ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par, NULL);
 406
 407         // Receive the response
 408         len = ReaderReceive(receivedAnswer);
 409
 410         res = 0;
 411         for (i = 0; i < 4; i++)
 412                 res |= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i;
 413
 414         if ((len != 1) || (res != 0x0A)) {
 415                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd send data2 Error: %02x", res);
 416                 return 2;
 417         }
 418
 419         return 0;
 420 }
 421
 422 int mifare_ultra_writeblock(uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 423 {
 424         // variables
 425         int len;
 426         uint32_t par = 0;
 427
 428         uint8_t d_block[18];
 429         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 430
 431         // command MIFARE_CLASSIC_WRITEBLOCK
 432         len = mifare_sendcmd_short(NULL, 1, 0xA0, blockNo, receivedAnswer,NULL);
 433
 434         if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK
 435                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Addr Error: %02x", receivedAnswer[0]);
 436                 return 1;
 437         }
 438
 439         memset(d_block,'\0',18);
 440         memcpy(d_block, blockData, 16);
 441         AppendCrc14443a(d_block, 16);
 442
 443         ReaderTransmitPar(d_block, sizeof(d_block), par, NULL);
 444
 445         // Receive the response
 446         len = ReaderReceive(receivedAnswer);
 447
 448         if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK
 449                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Data Error: %02x %d", receivedAnswer[0],len);
 450                 return 2;
 451         }
 452
 453         return 0;
 454 }
 455
 456 int mifare_ultra_special_writeblock(uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 457 {
 458         // variables
 459         int len;
 460         //uint32_t par = 0;
 461
 462         uint8_t d_block[8];
 463         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 464
 465         // command MIFARE_CLASSIC_WRITEBLOCK
 466         memset(d_block,'\0',8);
 467         d_block[0]= blockNo;
 468         memcpy(d_block+1,blockData,4);
 469         AppendCrc14443a(d_block, 6);
 470
 471         //i know the data send here is correct
 472         len = mifare_sendcmd_short_special(NULL, 1, 0xA2, d_block, receivedAnswer,NULL);
 473
 474         if (receivedAnswer[0] != 0x0A) {   //  0x0a - ACK
 475                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Send Error: %02x %d", receivedAnswer[0],len);
 476                 return 1;
 477         }
 478         return 0;
 479 }
 480
 481 int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid)
 482 {
 483         // variables
 484         int len;
 485
 486         // Mifare HALT
 487         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 488
 489         len = mifare_sendcmd_short(pcs, pcs == NULL ? 0:1, 0x50, 0x00, receivedAnswer, NULL);
 490         if (len != 0) {
 491                 if (MF_DBGLEVEL >= 1)   Dbprintf("halt error. response len: %x", len);
 492                 return 1;
 493         }
 494
 495         return 0;
 496 }
 497
 498 int mifare_ultra_halt(uint32_t uid)
 499 {
 500         // variables
 501         int len;
 502
 503         // Mifare HALT
 504         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 505
 506         len = mifare_sendcmd_short(NULL, 1, 0x50, 0x00, receivedAnswer, NULL);
 507         if (len != 0) {
 508                 if (MF_DBGLEVEL >= 1)   Dbprintf("halt error. response len: %x", len);
 509                 return 1;
 510         }
 511
 512         return 0;
 513 }
 514
 515
 516 // Mifare Memory Structure: up to 32 Sectors with 4 blocks each (1k and 2k cards),
 517 // plus evtl. 8 sectors with 16 blocks each (4k cards)
 518 uint8_t NumBlocksPerSector(uint8_t sectorNo)
 519 {
 520         if (sectorNo < 32)
 521                 return 4;
 522         else
 523                 return 16;
 524 }
 525
 526 uint8_t FirstBlockOfSector(uint8_t sectorNo)
 527 {
 528         if (sectorNo < 32)
 529                 return sectorNo * 4;
 530         else
 531                 return 32*4 + (sectorNo - 32) * 16;
 532
 533 }
 534
 535
 536 // work with emulator memory
 537 void emlSetMem(uint8_t *data, int blockNum, int blocksCount) {
 538         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 539
 540         memcpy(emCARD + blockNum * 16, data, blocksCount * 16);
 541 }
 542
 543 void emlGetMem(uint8_t *data, int blockNum, int blocksCount) {
 544         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 545
 546         memcpy(data, emCARD + blockNum * 16, blocksCount * 16);
 547 }
 548
 549 void emlGetMemBt(uint8_t *data, int bytePtr, int byteCount) {
 550         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 551
 552         memcpy(data, emCARD + bytePtr, byteCount);
 553 }
 554
 555 int emlCheckValBl(int blockNum) {
 556         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 557         uint8_t* data = emCARD + blockNum * 16;
 558
 559         if ((data[0] != (data[4] ^ 0xff)) || (data[0] != data[8]) ||
 560                         (data[1] != (data[5] ^ 0xff)) || (data[1] != data[9]) ||
 561                         (data[2] != (data[6] ^ 0xff)) || (data[2] != data[10]) ||
 562                         (data[3] != (data[7] ^ 0xff)) || (data[3] != data[11]) ||
 563                         (data[12] != (data[13] ^ 0xff)) || (data[12] != data[14]) ||
 564                         (data[12] != (data[15] ^ 0xff))
 565                  )
 566                 return 1;
 567         return 0;
 568 }
 569
 570 int emlGetValBl(uint32_t *blReg, uint8_t *blBlock, int blockNum) {
 571         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 572         uint8_t* data = emCARD + blockNum * 16;
 573
 574         if (emlCheckValBl(blockNum)) {
 575                 return 1;
 576         }
 577
 578         memcpy(blReg, data, 4);
 579         *blBlock = data[12];
 580
 581         return 0;
 582 }
 583
 584 int emlSetValBl(uint32_t blReg, uint8_t blBlock, int blockNum) {
 585         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 586         uint8_t* data = emCARD + blockNum * 16;
 587
 588         memcpy(data + 0, &blReg, 4);
 589         memcpy(data + 8, &blReg, 4);
 590         blReg = blReg ^ 0xffffffff;
 591         memcpy(data + 4, &blReg, 4);
 592
 593         data[12] = blBlock;
 594         data[13] = blBlock ^ 0xff;
 595         data[14] = blBlock;
 596         data[15] = blBlock ^ 0xff;
 597
 598         return 0;
 599 }
 600
 601 uint64_t emlGetKey(int sectorNum, int keyType) {
 602         uint8_t key[6];
 603         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 604
 605         memcpy(key, emCARD + 16 * (FirstBlockOfSector(sectorNum) + NumBlocksPerSector(sectorNum) - 1) + keyType * 10, 6);
 606         return bytes_to_num(key, 6);
 607 }
 608
 609 void emlClearMem(void) {
 610         int b;
 611
 612         const uint8_t trailer[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07, 0x80, 0x69, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 613         const uint8_t uid[]   =   {0xe6, 0x84, 0x87, 0xf3, 0x16, 0x88, 0x04, 0x00, 0x46, 0x8e, 0x45, 0x55, 0x4d, 0x70, 0x41, 0x04};
 614         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 615
 616         memset(emCARD, 0, CARD_MEMORY_LEN);
 617
 618         // fill sectors trailer data
 619         for(b = 3; b < 256; b<127?(b+=4):(b+=16)) {
 620                 emlSetMem((uint8_t *)trailer, b , 1);
 621         }
 622
 623         // uid
 624         emlSetMem((uint8_t *)uid, 0, 1);
 625         return;
 626 }