git.zerfleddert.de Git - proxmark3-svn/blob - client/loclass/elite_crack.h

   1 #ifndef ELITE_CRACK_H
   2 #define ELITE_CRACK_H
   3 void permutekey(uint8_t key[8], uint8_t dest[8]);
   4 /**
   5  * Permutes  a key from iclass specific format to NIST format
   6  * @brief permutekey_rev
   7  * @param key
   8  * @param dest
   9  */
  10 void permutekey_rev(uint8_t key[8], uint8_t dest[8]);
  11 //Crack status, see below
  12 #define CRACKED                 0x0100
  13 #define BEING_CRACKED   0x0200
  14 #define CRACK_FAILED    0x0400
  15
  16 /**
  17  * Perform a bruteforce against a file which has been saved by pm3
  18  *
  19  * @brief bruteforceFile
  20  * @param filename
  21  * @param keytable an arrah (128 x 16 bit ints). This is where the keydata is stored.
  22  * OBS! the upper part of the 16 bits store crack-status,
  23  * @return
  24  */
  25 int bruteforceFile(const char *filename, uint16_t keytable[]);
  26 /**
  27  *
  28  * @brief Same as above, if you don't care about the returned keytable (results only printed on screen)
  29  * @param filename
  30  * @return
  31  */
  32 int bruteforceFileNoKeys(const char *filename);
  33 /**
  34  * @brief Same as bruteforcefile, but uses a an array of dumpdata instead
  35  * @param dump
  36  * @param dumpsize
  37  * @param keytable
  38  * @return
  39  */
  40 int bruteforceDump(uint8_t dump[], size_t dumpsize, uint16_t keytable[]);
  41
  42 /**
  43   This is how we expect each 'entry' in a dumpfile to look
  44 **/
  45 typedef struct {
  46         uint8_t csn[8];
  47         uint8_t cc_nr[12];
  48         uint8_t mac[4];
  49
  50 }dumpdata;
  51
  52 /**
  53  * @brief Performs brute force attack against a dump-data item, containing csn, cc_nr and mac.
  54  *This method calculates the hash1 for the CSN, and determines what bytes need to be bruteforced
  55  *on the fly. If it finds that more than three bytes need to be bruteforced, it aborts.
  56  *It updates the keytable with the findings, also using the upper half of the 16-bit ints
  57  *to signal if the particular byte has been cracked or not.
  58  *
  59  * @param dump The dumpdata from iclass reader attack.
  60  * @param keytable where to write found values.
  61  * @return
  62  */
  63 int bruteforceItem(dumpdata item, uint16_t keytable[]);
  64 /**
  65  * Hash1 takes CSN as input, and determines what bytes in the keytable will be used
  66  * when constructing the K_sel.
  67  * @param csn the CSN used
  68  * @param k output
  69  */
  70 void hash1(uint8_t csn[] , uint8_t k[]);
  71 void hash2(uint8_t *key64, uint8_t *outp_keytable);
  72 /**
  73  * From dismantling iclass-paper:
  74  *      Assume that an adversary somehow learns the first 16 bytes of hash2(K_cus ), i.e., y [0] and z [0] .
  75  *      Then he can simply recover the master custom key K_cus by computing
  76  *      K_cus = ~DES(z[0] , y[0] ) .
  77  *
  78  *      Furthermore, the adversary is able to verify that he has the correct K cus by
  79  *      checking whether z [0] = DES enc (K_cus , ~K_cus ).
  80  * @param keytable an array (128 bytes) of hash2(kcus)
  81  * @param master_key where to put the master key
  82  * @return 0 for ok, 1 for failz
  83  */
  84 int calculateMasterKey(uint8_t first16bytes[], uint64_t master_key[] );
  85
  86 /**
  87  * @brief Test function
  88  * @return
  89  */
  90 int testElite();
  91
  92 /**
  93           Here are some pretty optimal values that can be used to recover necessary data in only
  94           eight auth attempts.
  95 // CSN                                        HASH1                                      Bytes recovered //
  96 { {0x00,0x0B,0x0F,0xFF,0xF7,0xFF,0x12,0xE0} , {0x01,0x01,0x00,0x00,0x45,0x01,0x45,0x45 } ,{0,1 }},
  97 { {0x00,0x13,0x94,0x7e,0x76,0xff,0x12,0xe0} , {0x02,0x0c,0x01,0x00,0x45,0x01,0x45,0x45} , {2,12}},
  98 { {0x2a,0x99,0xac,0x79,0xec,0xff,0x12,0xe0} , {0x07,0x45,0x0b,0x00,0x45,0x01,0x45,0x45} , {7,11}},
  99 { {0x17,0x12,0x01,0xfd,0xf7,0xff,0x12,0xe0} , {0x03,0x0f,0x00,0x00,0x45,0x01,0x45,0x45} , {3,15}},
 100 { {0xcd,0x56,0x01,0x7c,0x6f,0xff,0x12,0xe0} , {0x04,0x00,0x08,0x00,0x45,0x01,0x45,0x45} , {4,8}},
 101 { {0x4b,0x5e,0x0b,0x72,0xef,0xff,0x12,0xe0} , {0x0e,0x06,0x08,0x00,0x45,0x01,0x45,0x45} , {6,14}},
 102 { {0x00,0x73,0xd8,0x75,0x58,0xff,0x12,0xe0} , {0x0b,0x09,0x0f,0x00,0x45,0x01,0x05,0x45} , {9,5}},
 103 { {0x0c,0x90,0x32,0xf3,0x5d,0xff,0x12,0xe0} , {0x0d,0x0f,0x0a,0x00,0x45,0x01,0x05,0x45} , {10,13}},
 104
 105 **/
 106
 107
 108 #endif