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

   1 //-----------------------------------------------------------------------------
   2 // Merlok, May 2011
   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 "proxmark3.h"
  13 #include "apps.h"
  14 #include "util.h"
  15 #include "string.h"
  16
  17 #include "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)
  81 {
  82         return mifare_sendcmd_shortex(pcs, crypted, cmd, data, answer, NULL);
  83 }
  84
  85 int mifare_sendcmd_shortex(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer, uint32_t * parptr)
  86 {
  87         uint8_t dcmd[4], ecmd[4];
  88         uint32_t pos, par, res;
  89
  90         dcmd[0] = cmd;
  91         dcmd[1] = data;
  92         AppendCrc14443a(dcmd, 2);
  93
  94         memcpy(ecmd, dcmd, sizeof(dcmd));
  95
  96         if (crypted) {
  97                 par = 0;
  98                 for (pos = 0; pos < 4; pos++)
  99                 {
 100                         ecmd[pos] = crypto1_byte(pcs, 0x00, 0) ^ dcmd[pos];
 101                         par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) * 0x08 );
 102                 }
 103
 104                 ReaderTransmitPar(ecmd, sizeof(ecmd), par);
 105
 106         } else {
 107                 ReaderTransmit(dcmd, sizeof(dcmd));
 108         }
 109
 110         int len = ReaderReceivePar(answer, &par);
 111
 112         if (parptr) *parptr = par;
 113
 114         if (crypted == CRYPT_ALL) {
 115                 if (len == 1) {
 116                         res = 0;
 117                         for (pos = 0; pos < 4; pos++)
 118                                 res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], pos)) << pos;
 119
 120                         answer[0] = res;
 121
 122                 } else {
 123                         for (pos = 0; pos < len; pos++)
 124                         {
 125                                 answer[pos] = crypto1_byte(pcs, 0x00, 0) ^ answer[pos];
 126                         }
 127                 }
 128         }
 129
 130         return len;
 131 }
 132
 133 // mifare commands
 134 int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested)
 135 {
 136         return mifare_classic_authex(pcs, uid, blockNo, keyType, ui64Key, isNested, NULL);
 137 }
 138
 139 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)
 140 {
 141         // variables
 142         int len;
 143         uint32_t pos;
 144         uint8_t tmp4[4];
 145         byte_t par = 0;
 146         byte_t ar[4];
 147         uint32_t nt, ntpp; // Supplied tag nonce
 148
 149         uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
 150         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 151
 152         // Transmit MIFARE_CLASSIC_AUTH
 153         len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer);
 154   if (MF_DBGLEVEL >= 4) Dbprintf("rand nonce len: %x", len);
 155         if (len != 4) return 1;
 156
 157         ar[0] = 0x55;
 158         ar[1] = 0x41;
 159         ar[2] = 0x49;
 160         ar[3] = 0x92;
 161
 162         // Save the tag nonce (nt)
 163         nt = bytes_to_num(receivedAnswer, 4);
 164
 165         //  ----------------------------- crypto1 create
 166         if (isNested)
 167                 crypto1_destroy(pcs);
 168
 169         // Init cipher with key
 170         crypto1_create(pcs, ui64Key);
 171
 172         if (isNested == AUTH_NESTED) {
 173                 // decrypt nt with help of new key
 174                 nt = crypto1_word(pcs, nt ^ uid, 1) ^ nt;
 175         } else {
 176                 // Load (plain) uid^nt into the cipher
 177                 crypto1_word(pcs, nt ^ uid, 0);
 178         }
 179
 180         // some statistic
 181         if (!ntptr && (MF_DBGLEVEL >= 3))
 182                 Dbprintf("auth uid: %08x nt: %08x", uid, nt);
 183
 184         // save Nt
 185         if (ntptr)
 186                 *ntptr = nt;
 187
 188         par = 0;
 189         // Generate (encrypted) nr+parity by loading it into the cipher (Nr)
 190         for (pos = 0; pos < 4; pos++)
 191         {
 192                 mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos];
 193                 par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(ar[pos])) & 0x01) * 0x80 );
 194         }
 195
 196         // Skip 32 bits in pseudo random generator
 197         nt = prng_successor(nt,32);
 198
 199         //  ar+parity
 200         for (pos = 4; pos < 8; pos++)
 201         {
 202                 nt = prng_successor(nt,8);
 203                 mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff);
 204                 par = (par >> 1)| ( ((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) * 0x80 );
 205         }
 206
 207         // Transmit reader nonce and reader answer
 208         ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par);
 209
 210         // Receive 4 bit answer
 211         len = ReaderReceive(receivedAnswer);
 212         if (!len)
 213         {
 214                 if (MF_DBGLEVEL >= 1)   Dbprintf("Authentication failed. Card timeout.");
 215                 return 2;
 216         }
 217
 218         memcpy(tmp4, receivedAnswer, 4);
 219         ntpp = prng_successor(nt, 32) ^ crypto1_word(pcs, 0,0);
 220
 221         if (ntpp != bytes_to_num(tmp4, 4)) {
 222                 if (MF_DBGLEVEL >= 1)   Dbprintf("Authentication failed. Error card response.");
 223                 return 3;
 224         }
 225
 226         return 0;
 227 }
 228
 229 int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 230 {
 231         // variables
 232         int len;
 233         uint8_t bt[2];
 234
 235         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 236
 237         // command MIFARE_CLASSIC_READBLOCK
 238         len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer);
 239         if (len == 1) {
 240                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 241                 return 1;
 242         }
 243         if (len != 18) {
 244                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: card timeout. len: %x", len);
 245                 return 2;
 246         }
 247
 248         memcpy(bt, receivedAnswer + 16, 2);
 249         AppendCrc14443a(receivedAnswer, 16);
 250         if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) {
 251                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd CRC response error.");
 252                 return 3;
 253         }
 254
 255         memcpy(blockData, receivedAnswer, 16);
 256         return 0;
 257 }
 258
 259 int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 260 {
 261         // variables
 262         int len, i;
 263         uint32_t pos;
 264         uint32_t par = 0;
 265         byte_t res;
 266
 267         uint8_t d_block[18], d_block_enc[18];
 268         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 269
 270         // command MIFARE_CLASSIC_WRITEBLOCK
 271         len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer);
 272
 273         if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK
 274                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 275                 return 1;
 276         }
 277
 278         memcpy(d_block, blockData, 16);
 279         AppendCrc14443a(d_block, 16);
 280
 281         // crypto
 282         par = 0;
 283         for (pos = 0; pos < 18; pos++)
 284         {
 285                 d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];
 286                 par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) * 0x20000 );
 287         }
 288
 289         ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par);
 290
 291         // Receive the response
 292         len = ReaderReceive(receivedAnswer);
 293
 294         res = 0;
 295         for (i = 0; i < 4; i++)
 296                 res |= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i;
 297
 298         if ((len != 1) || (res != 0x0A)) {
 299                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd send data2 Error: %02x", res);
 300                 return 2;
 301         }
 302
 303         return 0;
 304 }
 305
 306 int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid)
 307 {
 308         // variables
 309         int len;
 310
 311         // Mifare HALT
 312         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 313
 314         len = mifare_sendcmd_short(pcs, 1, 0x50, 0x00, receivedAnswer);
 315         if (len != 0) {
 316                 if (MF_DBGLEVEL >= 1)   Dbprintf("halt error. response len: %x", len);
 317                 return 1;
 318         }
 319
 320         return 0;
 321 }
 322
 323 // work with emulator memory
 324 void emlSetMem(uint8_t *data, int blockNum, int blocksCount) {
 325         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 326
 327         memcpy(emCARD + blockNum * 16, data, blocksCount * 16);
 328 }
 329
 330 void emlGetMem(uint8_t *data, int blockNum, int blocksCount) {
 331         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 332
 333         memcpy(data, emCARD + blockNum * 16, blocksCount * 16);
 334 }
 335
 336 void emlGetMemBt(uint8_t *data, int bytePtr, int byteCount) {
 337         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 338
 339         memcpy(data, emCARD + bytePtr, byteCount);
 340 }
 341
 342 int emlCheckValBl(int blockNum) {
 343         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 344         uint8_t* data = emCARD + blockNum * 16;
 345
 346         if ((data[0] != (data[4] ^ 0xff)) || (data[0] != data[8]) ||
 347                         (data[1] != (data[5] ^ 0xff)) || (data[1] != data[9]) ||
 348                         (data[2] != (data[6] ^ 0xff)) || (data[2] != data[10]) ||
 349                         (data[3] != (data[7] ^ 0xff)) || (data[3] != data[11]) ||
 350                         (data[12] != (data[13] ^ 0xff)) || (data[12] != data[14]) ||
 351                         (data[12] != (data[15] ^ 0xff))
 352                  )
 353                 return 1;
 354         return 0;
 355 }
 356
 357 int emlGetValBl(uint32_t *blReg, uint8_t *blBlock, int blockNum) {
 358         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 359         uint8_t* data = emCARD + blockNum * 16;
 360
 361         if (emlCheckValBl(blockNum)) {
 362                 return 1;
 363         }
 364
 365         memcpy(blReg, data, 4);
 366         *blBlock = data[12];
 367
 368         return 0;
 369 }
 370
 371 int emlSetValBl(uint32_t blReg, uint8_t blBlock, int blockNum) {
 372         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 373         uint8_t* data = emCARD + blockNum * 16;
 374
 375         memcpy(data + 0, &blReg, 4);
 376         memcpy(data + 8, &blReg, 4);
 377         blReg = blReg ^ 0xffffffff;
 378         memcpy(data + 4, &blReg, 4);
 379
 380         data[12] = blBlock;
 381         data[13] = blBlock ^ 0xff;
 382         data[14] = blBlock;
 383         data[15] = blBlock ^ 0xff;
 384
 385         return 0;
 386 }
 387
 388 uint64_t emlGetKey(int sectorNum, int keyType) {
 389         uint8_t key[6];
 390         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 391
 392         memcpy(key, emCARD + 3 * 16 + sectorNum * 4 * 16 + keyType * 10, 6);
 393         return bytes_to_num(key, 6);
 394 }
 395
 396 void emlClearMem(void) {
 397         int b;
 398
 399         const uint8_t trailer[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07, 0x80, 0x69, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 400         const uint8_t uid[]   =   {0xe6, 0x84, 0x87, 0xf3, 0x16, 0x88, 0x04, 0x00, 0x46, 0x8e, 0x45, 0x55, 0x4d, 0x70, 0x41, 0x04};
 401         uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 402
 403         memset(emCARD, 0, CARD_MEMORY_LEN);
 404
 405         // fill sectors trailer data
 406         for(b = 3; b < 256; b<127?(b+=4):(b+=16)) {
 407                 emlSetMem((uint8_t *)trailer, b , 1);
 408         }
 409
 410         // uid
 411         emlSetMem((uint8_t *)uid, 0, 1);
 412         return;
 413 }