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 uint8_t* mifare_get_bigbufptr(void) {
  23         return (((uint8_t *)BigBuf) + 3560);    // was 3560 - tied to other size changes
  24 }
  25
  26 int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer)
  27 {
  28         return mifare_sendcmd_shortex(pcs, crypted, cmd, data, answer, NULL);
  29 }
  30
  31 int mifare_sendcmd_shortex(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer, uint32_t * parptr)
  32 {
  33         uint8_t dcmd[4], ecmd[4];
  34         uint32_t pos, par, res;
  35
  36         dcmd[0] = cmd;
  37         dcmd[1] = data;
  38         AppendCrc14443a(dcmd, 2);
  39
  40         memcpy(ecmd, dcmd, sizeof(dcmd));
  41
  42         if (crypted) {
  43                 par = 0;
  44                 for (pos = 0; pos < 4; pos++)
  45                 {
  46                         ecmd[pos] = crypto1_byte(pcs, 0x00, 0) ^ dcmd[pos];
  47                         par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) * 0x08 );
  48                 }
  49
  50                 ReaderTransmitPar(ecmd, sizeof(ecmd), par);
  51
  52         } else {
  53                 ReaderTransmit(dcmd, sizeof(dcmd));
  54         }
  55
  56         int len = ReaderReceivePar(answer, &par);
  57
  58         if (parptr) *parptr = par;
  59
  60         if (crypted == CRYPT_ALL) {
  61                 if (len == 1) {
  62                         res = 0;
  63                         for (pos = 0; pos < 4; pos++)
  64                                 res |= (crypto1_bit(pcs, 0, 0) ^ BIT(answer[0], pos)) << pos;
  65
  66                         answer[0] = res;
  67
  68                 } else {
  69                         for (pos = 0; pos < len; pos++)
  70                         {
  71                                 answer[pos] = crypto1_byte(pcs, 0x00, 0) ^ answer[pos];
  72                         }
  73                 }
  74         }
  75
  76         return len;
  77 }
  78
  79 int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested)
  80 {
  81         return mifare_classic_authex(pcs, uid, blockNo, keyType, ui64Key, isNested, NULL);
  82 }
  83
  84 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)
  85 {
  86         // variables
  87         int len;
  88         uint32_t pos;
  89         uint8_t tmp4[4];
  90         byte_t par = 0;
  91         byte_t ar[4];
  92         uint32_t nt, ntpp; // Supplied tag nonce
  93
  94         uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
  95         uint8_t* receivedAnswer = mifare_get_bigbufptr();
  96
  97         // Transmit MIFARE_CLASSIC_AUTH
  98         len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer);
  99 //      Dbprintf("rand nonce len: %x", len);
 100         if (len != 4) return 1;
 101
 102         ar[0] = 0x55;
 103         ar[1] = 0x41;
 104         ar[2] = 0x49;
 105         ar[3] = 0x92;
 106
 107         // Save the tag nonce (nt)
 108         nt = bytes_to_num(receivedAnswer, 4);
 109
 110         //  ----------------------------- crypto1 create
 111         if (isNested)
 112                 crypto1_destroy(pcs);
 113
 114         // Init cipher with key
 115         crypto1_create(pcs, ui64Key);
 116
 117         if (isNested == AUTH_NESTED) {
 118                 // decrypt nt with help of new key
 119                 nt = crypto1_word(pcs, nt ^ uid, 1) ^ nt;
 120         } else {
 121                 // Load (plain) uid^nt into the cipher
 122                 crypto1_word(pcs, nt ^ uid, 0);
 123         }
 124
 125         // some statistic
 126         if (!ntptr)
 127                 Dbprintf("auth uid: %08x nt: %08x", uid, nt);
 128
 129         // save Nt
 130         if (ntptr)
 131                 *ntptr = nt;
 132
 133         par = 0;
 134         // Generate (encrypted) nr+parity by loading it into the cipher (Nr)
 135         for (pos = 0; pos < 4; pos++)
 136         {
 137                 mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos];
 138                 par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(ar[pos])) & 0x01) * 0x80 );
 139         }
 140
 141         // Skip 32 bits in pseudo random generator
 142         nt = prng_successor(nt,32);
 143
 144         //  ar+parity
 145         for (pos = 4; pos < 8; pos++)
 146         {
 147                 nt = prng_successor(nt,8);
 148                 mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff);
 149                 par = (par >> 1)| ( ((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) * 0x80 );
 150         }
 151
 152         // Transmit reader nonce and reader answer
 153         ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par);
 154
 155         // Receive 4 bit answer
 156         len = ReaderReceive(receivedAnswer);
 157         if (!len)
 158         {
 159                 Dbprintf("Authentication failed. Card timeout.");
 160                 return 2;
 161         }
 162
 163         memcpy(tmp4, receivedAnswer, 4);
 164         ntpp = prng_successor(nt, 32) ^ crypto1_word(pcs, 0,0);
 165
 166         if (ntpp != bytes_to_num(tmp4, 4)) {
 167                 Dbprintf("Authentication failed. Error card response.");
 168                 return 3;
 169         }
 170
 171         return 0;
 172 }
 173
 174 int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 175 {
 176         // variables
 177         int len;
 178         uint8_t bt[2];
 179
 180         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 181
 182         // command MIFARE_CLASSIC_READBLOCK
 183         len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer);
 184         if (len == 1) {
 185                 Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 186                 return 1;
 187         }
 188         if (len != 18) {
 189                 Dbprintf("Cmd Error: card timeout. len: %x", len);
 190                 return 2;
 191         }
 192
 193         memcpy(bt, receivedAnswer + 16, 2);
 194         AppendCrc14443a(receivedAnswer, 16);
 195         if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) {
 196                 Dbprintf("Cmd CRC response error.");
 197                 return 3;
 198         }
 199
 200         memcpy(blockData, receivedAnswer, 16);
 201         return 0;
 202 }
 203
 204 int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 205 {
 206         // variables
 207         int len, i;
 208         uint32_t pos;
 209         uint32_t par = 0;
 210         byte_t res;
 211
 212         uint8_t d_block[18], d_block_enc[18];
 213         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 214
 215         // command MIFARE_CLASSIC_WRITEBLOCK
 216         len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer);
 217
 218         if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK
 219                 Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 220                 return 1;
 221         }
 222
 223         memcpy(d_block, blockData, 16);
 224         AppendCrc14443a(d_block, 16);
 225
 226         // crypto
 227         par = 0;
 228         for (pos = 0; pos < 18; pos++)
 229         {
 230                 d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];
 231                 par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) * 0x20000 );
 232         }
 233
 234         ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par);
 235
 236         // Receive the response
 237         len = ReaderReceive(receivedAnswer);
 238
 239         res = 0;
 240         for (i = 0; i < 4; i++)
 241                 res |= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i;
 242
 243         if ((len != 1) || (res != 0x0A)) {
 244                 Dbprintf("Cmd send data2 Error: %02x", res);
 245                 return 2;
 246         }
 247
 248         return 0;
 249 }
 250
 251 int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid)
 252 {
 253         // variables
 254         int len;
 255
 256         // Mifare HALT
 257         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 258
 259         len = mifare_sendcmd_short(pcs, 1, 0x50, 0x00, receivedAnswer);
 260         if (len != 0) {
 261                 Dbprintf("halt error. response len: %x", len);
 262                 return 1;
 263         }
 264
 265         return 0;
 266 }