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 == CRYPT_ALL) {
  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
  98         //  ----------------------------- crypto1 create
  99         if (isNested)
 100                 crypto1_destroy(pcs);
 101
 102         // Init cipher with key
 103         crypto1_create(pcs, ui64Key);
 104
 105         if (isNested == AUTH_NESTED) {
 106                 // decrypt nt with help of new key
 107                 nt = crypto1_word(pcs, nt ^ uid, 1) ^ nt;
 108         } else {
 109                 // Load (plain) uid^nt into the cipher
 110                 crypto1_word(pcs, nt ^ uid, 0);
 111         }
 112
 113         // some statistic
 114         Dbprintf("auth uid: %08x nt: %08x", uid, nt);
 115
 116         par = 0;
 117         // Generate (encrypted) nr+parity by loading it into the cipher (Nr)
 118         for (pos = 0; pos < 4; pos++)
 119         {
 120                 mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos];
 121                 par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(ar[pos])) & 0x01) * 0x80 );
 122         }
 123
 124         // Skip 32 bits in pseudo random generator
 125         nt = prng_successor(nt,32);
 126
 127         //  ar+parity
 128         for (pos = 4; pos < 8; pos++)
 129         {
 130                 nt = prng_successor(nt,8);
 131                 mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff);
 132                 par = (par >> 1)| ( ((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) * 0x80 );
 133         }
 134
 135         // Transmit reader nonce and reader answer
 136         ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par);
 137
 138         // Receive 4 bit answer
 139         len = ReaderReceive(receivedAnswer);
 140         if (!len)
 141         {
 142                 Dbprintf("Authentication failed. Card timeout.");
 143                 return 2;
 144         }
 145
 146         memcpy(tmp4, receivedAnswer, 4);
 147         ntpp = prng_successor(nt, 32) ^ crypto1_word(pcs, 0,0);
 148
 149         if (ntpp != bytes_to_num(tmp4, 4)) {
 150                 Dbprintf("Authentication failed. Error card response.");
 151                 return 3;
 152         }
 153
 154         return 0;
 155 }
 156
 157 int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 158 {
 159         // variables
 160         int len;
 161         uint8_t bt[2];
 162
 163         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 164
 165         // command MIFARE_CLASSIC_READBLOCK
 166         len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer);
 167         if (len == 1) {
 168                 Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 169                 return 1;
 170         }
 171         if (len != 18) {
 172                 Dbprintf("Cmd Error: card timeout. len: %x", len);
 173                 return 2;
 174         }
 175
 176         memcpy(bt, receivedAnswer + 16, 2);
 177         AppendCrc14443a(receivedAnswer, 16);
 178         if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) {
 179                 Dbprintf("Cmd CRC response error.");
 180                 return 3;
 181         }
 182
 183         memcpy(blockData, receivedAnswer, 16);
 184         return 0;
 185 }
 186
 187 int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData)
 188 {
 189         // variables
 190         int len, i;
 191         uint32_t pos;
 192         uint32_t par = 0;
 193         byte_t res;
 194
 195         uint8_t d_block[18], d_block_enc[18];
 196         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 197
 198         // command MIFARE_CLASSIC_WRITEBLOCK
 199         len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer);
 200
 201         if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK
 202                 Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
 203                 return 1;
 204         }
 205
 206         memcpy(d_block, blockData, 16);
 207         AppendCrc14443a(d_block, 16);
 208
 209         // crypto
 210         par = 0;
 211         for (pos = 0; pos < 18; pos++)
 212         {
 213                 d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];
 214                 par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) * 0x20000 );
 215         }
 216
 217         ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par);
 218
 219         // Receive the response
 220         len = ReaderReceive(receivedAnswer);
 221
 222         res = 0;
 223         for (i = 0; i < 4; i++)
 224                 res |= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i;
 225
 226         if ((len != 1) || (res != 0x0A)) {
 227                 Dbprintf("Cmd send data2 Error: %02x", res);
 228                 return 2;
 229         }
 230
 231         return 0;
 232 }
 233
 234 int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid)
 235 {
 236         // variables
 237         int len;
 238
 239         // Mifare HALT
 240         uint8_t* receivedAnswer = mifare_get_bigbufptr();
 241
 242         len = mifare_sendcmd_short(pcs, 1, 0x50, 0x00, receivedAnswer);
 243         if (len != 0) {
 244                 Dbprintf("halt error. response len: %x", len);
 245                 return 1;
 246         }
 247
 248         return 0;
 249 }