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

   1 //-----------------------------------------------------------------------------
   2 // Merlok, May 2011
   3 // Many authors, that makes 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 // code for 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 uint8_t* mifare_get_bigbufptr(void) {
  25         return (((uint8_t *)BigBuf) + 3560);    // was 3560 - tied to other size changes
  26 }
  27
  28 int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer)
  29 {
  30         return mifare_sendcmd_shortex(pcs, crypted, cmd, data, answer, NULL);
  31 }
  32
  33 int mifare_sendcmd_shortex(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer, uint32_t * parptr)
  34 {
  35         uint8_t dcmd[4], ecmd[4];
  36         uint32_t pos, par, res;
  37
  38         dcmd[0] = cmd;
  39         dcmd[1] = data;
  40         AppendCrc14443a(dcmd, 2);
  41
  42         memcpy(ecmd, dcmd, sizeof(dcmd));
  43
  44         if (crypted) {
  45                 par = 0;
  46                 for (pos = 0; pos < 4; pos++)
  47                 {
  48                         ecmd[pos] = crypto1_byte(pcs, 0x00, 0) ^ dcmd[pos];
  49                         par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) * 0x08 );
  50                 }
  51
  52                 ReaderTransmitPar(ecmd, sizeof(ecmd), par);
  53
  54         } else {
  55                 ReaderTransmit(dcmd, sizeof(dcmd));
  56         }
  57
  58         int len = ReaderReceivePar(answer, &par);
  59
  60         if (parptr) *parptr = par;
  61
  62         if (crypted == CRYPT_ALL) {
  63                 if (len == 1) {
  64                         res = 0;
  65                         for (pos = 0; pos < 4; pos++)
  66                                 res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], pos)) << pos;
  67
  68                         answer[0] = res;
  69
  70                 } else {
  71                         for (pos = 0; pos < len; pos++)
  72                         {
  73                                 answer[pos] = crypto1_byte(pcs, 0x00, 0) ^ answer[pos];
  74                         }
  75                 }
  76         }
  77
  78         return len;
  79 }
  80
  81 int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested)
  82 {
  83         return mifare_classic_authex(pcs, uid, blockNo, keyType, ui64Key, isNested, NULL);
  84 }
  85
  86 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)
  87 {
  88         // variables
  89         int len;
  90         uint32_t pos;
  91         uint8_t tmp4[4];
  92         byte_t par = 0;
  93         byte_t ar[4];
  94         uint32_t nt, ntpp; // Supplied tag nonce
  95
  96         uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
  97         uint8_t* receivedAnswer = mifare_get_bigbufptr();
  98
  99         // Transmit MIFARE_CLASSIC_AUTH
 100         len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer);
 101   if (MF_DBGLEVEL >= 4) Dbprintf("rand nonce len: %x", len);
 102         if (len != 4) return 1;
 103
 104         ar[0] = 0x55;
 105         ar[1] = 0x41;
 106         ar[2] = 0x49;
 107         ar[3] = 0x92;
 108
 109         // Save the tag nonce (nt)
 110         nt = bytes_to_num(receivedAnswer, 4);
 111
 112         //  ----------------------------- crypto1 create
 113         if (isNested)
 114                 crypto1_destroy(pcs);
 115
 116         // Init cipher with key
 117         crypto1_create(pcs, ui64Key);
 118
 119         if (isNested == AUTH_NESTED) {
 120                 // decrypt nt with help of new key
 121                 nt = crypto1_word(pcs, nt ^ uid, 1) ^ nt;
 122         } else {
 123                 // Load (plain) uid^nt into the cipher
 124                 crypto1_word(pcs, nt ^ uid, 0);
 125         }
 126
 127         // some statistic
 128         if (!ntptr && (MF_DBGLEVEL >= 3))
 129                 Dbprintf("auth uid: %08x nt: %08x", uid, nt);
 130
 131         // save Nt
 132         if (ntptr)
 133                 *ntptr = nt;
 134
 135         par = 0;
 136         // Generate (encrypted) nr+parity by loading it into the cipher (Nr)
 137         for (pos = 0; pos < 4; pos++)
 138         {
 139                 mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos];
 140                 par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(ar[pos])) & 0x01) * 0x80 );
 141         }
 142
 143         // Skip 32 bits in pseudo random generator
 144         nt = prng_successor(nt,32);
 145
 146         //  ar+parity
 147         for (pos = 4; pos < 8; pos++)
 148         {
 149                 nt = prng_successor(nt,8);
 150                 mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff);
 151                 par = (par >> 1)| ( ((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) * 0x80 );
 152         }
 153
 154         // Transmit reader nonce and reader answer
 155         ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par);
 156
 157         // Receive 4 bit answer
 158         len = ReaderReceive(receivedAnswer);
 159         if (!len)
 160         {
 161                 if (MF_DBGLEVEL >= 1)   Dbprintf("Authentication failed. Card timeout.");
 162                 return 2;
 163         }
 164
 165         memcpy(tmp4, receivedAnswer, 4);
 166         ntpp = prng_successor(nt, 32) ^ crypto1_word(pcs, 0,0);
 167
 168         if (ntpp != bytes_to_num(tmp4, 4)) {
 169                 if (MF_DBGLEVEL >= 1)   Dbprintf("Authentication failed. Error card response.");
 170                 return 3;
 171         }
 172
 173         return 0;
 174 }
 175
 176 int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 177 {
 178         // variables
 179         int len;
 180         uint8_t bt[2];
 181
 182         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 183
 184         // command MIFARE_CLASSIC_READBLOCK
 185         len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer);
 186         if (len == 1) {
 187                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 188                 return 1;
 189         }
 190         if (len != 18) {
 191                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: card timeout. len: %x", len);
 192                 return 2;
 193         }
 194
 195         memcpy(bt, receivedAnswer + 16, 2);
 196         AppendCrc14443a(receivedAnswer, 16);
 197         if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) {
 198                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd CRC response error.");
 199                 return 3;
 200         }
 201
 202         memcpy(blockData, receivedAnswer, 16);
 203         return 0;
 204 }
 205
 206 int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 207 {
 208         // variables
 209         int len, i;
 210         uint32_t pos;
 211         uint32_t par = 0;
 212         byte_t res;
 213
 214         uint8_t d_block[18], d_block_enc[18];
 215         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 216
 217         // command MIFARE_CLASSIC_WRITEBLOCK
 218         len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer);
 219
 220         if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK
 221                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 222                 return 1;
 223         }
 224
 225         memcpy(d_block, blockData, 16);
 226         AppendCrc14443a(d_block, 16);
 227
 228         // crypto
 229         par = 0;
 230         for (pos = 0; pos < 18; pos++)
 231         {
 232                 d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];
 233                 par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) * 0x20000 );
 234         }
 235
 236         ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par);
 237
 238         // Receive the response
 239         len = ReaderReceive(receivedAnswer);
 240
 241         res = 0;
 242         for (i = 0; i < 4; i++)
 243                 res |= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i;
 244
 245         if ((len != 1) || (res != 0x0A)) {
 246                 if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd send data2 Error: %02x", res);
 247                 return 2;
 248         }
 249
 250         return 0;
 251 }
 252
 253 int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid)
 254 {
 255         // variables
 256         int len;
 257
 258         // Mifare HALT
 259         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 260
 261         len = mifare_sendcmd_short(pcs, 1, 0x50, 0x00, receivedAnswer);
 262         if (len != 0) {
 263                 if (MF_DBGLEVEL >= 1)   Dbprintf("halt error. response len: %x", len);
 264                 return 1;
 265         }
 266
 267         return 0;
 268 }
 269