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

   1 /*****************************************************************************
   2  * This file is part of iClassCipher. It is a reconstructon of the cipher engine
   3  * used in iClass, and RFID techology.
   4  *
   5  * The implementation is based on the work performed by
   6  * Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
   7  * Milosch Meriac in the paper "Dismantling IClass".
   8  *
   9  * Copyright (C) 2014 Martin Holst Swende
  10  *
  11  * This is free software: you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as published
  13  * by the Free Software Foundation.
  14  *
  15  * This file is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with IClassCipher.  If not, see <http://www.gnu.org/licenses/>.
  22  ****************************************************************************/
  23
  24 #ifndef CIPHER_H
  25 #define CIPHER_H
  26 #include <stdint.h>
  27
  28 /**
  29 * Definition 1 (Cipher state). A cipher state of iClass s is an element of F 40/2
  30 * consisting of the following four components:
  31 *       1. the left register l = (l 0 . . . l 7 ) ∈ F 8/2 ;
  32 *       2. the right register r = (r 0 . . . r 7 ) ∈ F 8/2 ;
  33 *       3. the top register t = (t 0 . . . t 15 ) ∈ F 16/2 .
  34 *       4. the bottom register b = (b 0 . . . b 7 ) ∈ F 8/2 .
  35 **/
  36 typedef struct {
  37         uint8_t l;
  38         uint8_t r;
  39         uint8_t b;
  40         uint16_t t;
  41 } State;
  42
  43 void printarr(char * name, uint8_t* arr, int len);
  44 int calc_iclass_mac(uint8_t *cc_nr_p, int length, uint8_t *div_key_p, uint8_t *mac);
  45
  46 #endif // CIPHER_H