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