armsrc/optimized_cipherutils.h

   1 //-----------------------------------------------------------------------------
   2 // Borrowed initially from https://github.com/holiman/loclass
   3 // Copyright (C) 2014 Martin Holst Swende
   4 // Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
   5 //
   6 // This program is free software: you can redistribute it and/or modify
   7 // it under the terms of the GNU General Public License as published by
   8 // the Free Software Foundation, either version 3 of the License, or
   9 // (at your option) any later version.
  10 //
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // See LICENSE.txt for the text of the license.
  17 //-----------------------------------------------------------------------------
  18 // WARNING
  19 //
  20 // THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
  21 //
  22 // USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
  23 // PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
  24 // AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
  25 //
  26 // THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
  27 //-----------------------------------------------------------------------------
  28 // It is a reconstruction of the cipher engine used in iClass, and RFID techology.
  29 //
  30 // The implementation is based on the work performed by
  31 // Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
  32 // Milosch Meriac in the paper "Dismantling IClass".
  33 //-----------------------------------------------------------------------------
  34 #ifndef CIPHERUTILS_H
  35 #define CIPHERUTILS_H
  36 #include <stdint.h>
  37 #include <stdbool.h>
  38 #include <stdlib.h>
  39
  40 typedef struct {
  41     uint8_t *buffer;
  42     uint32_t numbits;
  43     uint32_t position;
  44 } BitstreamIn_t;
  45
  46 typedef struct {
  47     uint8_t *buffer;
  48     uint32_t numbits;
  49     uint32_t position;
  50 } BitstreamOut_t;
  51
  52 bool headBit(BitstreamIn_t *stream);
  53 bool tailBit(BitstreamIn_t *stream);
  54 void pushBit(BitstreamOut_t *stream, bool bit);
  55 int bitsLeft(BitstreamIn_t *stream);
  56
  57 void push6bits(BitstreamOut_t *stream, uint8_t bits);
  58 void x_num_to_bytes(uint64_t n, size_t len, uint8_t *dest);
  59 uint64_t x_bytes_to_num(uint8_t *src, size_t len);
  60 #endif // CIPHERUTILS_H