armsrc/optimized_cipherutils.h

   1 /*****************************************************************************
   2  * WARNING
   3  *
   4  * THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
   5  *
   6  * USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
   7  * PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
   8  * AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
   9  *
  10  * THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
  11  *
  12  *****************************************************************************
  13  *
  14  * This file is part of loclass. It is a reconstructon of the cipher engine
  15  * used in iClass, and RFID techology.
  16  *
  17  * The implementation is based on the work performed by
  18  * Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
  19  * Milosch Meriac in the paper "Dismantling IClass".
  20  *
  21  * Copyright (C) 2014 Martin Holst Swende
  22  *
  23  * This is free software: you can redistribute it and/or modify
  24  * it under the terms of the GNU General Public License version 2 as published
  25  * by the Free Software Foundation, or, at your option, any later version.
  26  *
  27  * This file is distributed in the hope that it will be useful,
  28  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30  * GNU General Public License for more details.
  31  *
  32  * You should have received a copy of the GNU General Public License
  33  * along with loclass.  If not, see <http://www.gnu.org/licenses/>.
  34  *
  35  *
  36  ****************************************************************************/
  37 #ifndef CIPHERUTILS_H
  38 #define CIPHERUTILS_H
  39 #include <stdint.h>
  40 #include <stdbool.h>
  41 #include <stdlib.h>
  42
  43 typedef struct {
  44     uint8_t *buffer;
  45     uint8_t numbits;
  46     uint8_t position;
  47 } BitstreamIn;
  48
  49 typedef struct {
  50     uint8_t *buffer;
  51     uint8_t numbits;
  52     uint8_t position;
  53 } BitstreamOut;
  54
  55 bool headBit(BitstreamIn *stream);
  56 bool tailBit(BitstreamIn *stream);
  57 void pushBit(BitstreamOut *stream, bool bit);
  58 int bitsLeft(BitstreamIn *stream);
  59
  60 void push6bits(BitstreamOut *stream, uint8_t bits);
  61 void x_num_to_bytes(uint64_t n, size_t len, uint8_t *dest);
  62 uint64_t x_bytes_to_num(uint8_t *src, size_t len);
  63 uint8_t reversebytes(uint8_t b);
  64 void reverse_arraybytes(uint8_t *arr, size_t len);
  65 void reverse_arraycopy(uint8_t *arr, uint8_t *dest, size_t len);
  66 #endif // CIPHERUTILS_H