f46ae5a704
* Namespace loclass library * Lib: const for immutable variables and bss cleanup Co-authored-by: あく <alleteam@gmail.com>
91 lines
3.7 KiB
C
91 lines
3.7 KiB
C
//-----------------------------------------------------------------------------
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// Borrowed initially from https://github.com/holiman/loclass
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// More recently from https://github.com/RfidResearchGroup/proxmark3
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// Copyright (C) 2014 Martin Holst Swende
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// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// See LICENSE.txt for the text of the license.
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//-----------------------------------------------------------------------------
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// WARNING
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//
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// THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
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//
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// USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
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// PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
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// AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
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//
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// THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
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//-----------------------------------------------------------------------------
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// It is a reconstruction of the cipher engine used in iClass, and RFID techology.
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//
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// The implementation is based on the work performed by
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// Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
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// Milosch Meriac in the paper "Dismantling IClass".
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//-----------------------------------------------------------------------------
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#ifndef OPTIMIZED_CIPHER_H
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#define OPTIMIZED_CIPHER_H
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <stdint.h>
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/**
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* Definition 1 (Cipher state). A cipher state of iClass s is an element of F 40/2
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* consisting of the following four components:
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* 1. the left register l = (l 0 . . . l 7 ) ∈ F 8/2 ;
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* 2. the right register r = (r 0 . . . r 7 ) ∈ F 8/2 ;
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* 3. the top register t = (t 0 . . . t 15 ) ∈ F 16/2 .
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* 4. the bottom register b = (b 0 . . . b 7 ) ∈ F 8/2 .
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**/
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typedef struct {
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uint8_t l;
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uint8_t r;
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uint8_t b;
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uint16_t t;
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} LoclassState_t;
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/** The reader MAC is MAC(key, CC * NR )
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**/
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void loclass_opt_doReaderMAC(uint8_t *cc_nr_p, uint8_t *div_key_p, uint8_t mac[4]);
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void loclass_opt_doReaderMAC_2(LoclassState_t _init, uint8_t *nr, uint8_t mac[4], const uint8_t *div_key_p);
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/**
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* The tag MAC is MAC(key, CC * NR * 32x0))
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*/
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void loclass_opt_doTagMAC(uint8_t *cc_p, const uint8_t *div_key_p, uint8_t mac[4]);
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/**
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* The tag MAC can be divided (both can, but no point in dividing the reader mac) into
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* two functions, since the first 8 bytes are known, we can pre-calculate the state
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* reached after feeding CC to the cipher.
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* @param cc_p
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* @param div_key_p
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* @return the cipher state
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*/
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LoclassState_t loclass_opt_doTagMAC_1(uint8_t *cc_p, const uint8_t *div_key_p);
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/**
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* The second part of the tag MAC calculation, since the CC is already calculated into the state,
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* this function is fed only the NR, and internally feeds the remaining 32 0-bits to generate the tag
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* MAC response.
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* @param _init - precalculated cipher state
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* @param nr - the reader challenge
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* @param mac - where to store the MAC
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* @param div_key_p - the key to use
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*/
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void loclass_opt_doTagMAC_2(LoclassState_t _init, uint8_t *nr, uint8_t mac[4], const uint8_t *div_key_p);
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void loclass_doMAC_N(uint8_t *in_p, uint8_t in_size, uint8_t *div_key_p, uint8_t mac[4]);
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void loclass_iclass_calc_div_key(uint8_t *csn, uint8_t *key, uint8_t *div_key, bool elite);
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#endif // OPTIMIZED_CIPHER_H
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