//-----------------------------------------------------------------------------
// Borrowed initially from https://github.com/holiman/loclass
// Copyright (C) 2014 Martin Holst Swende
// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// See LICENSE.txt for the text of the license.
//-----------------------------------------------------------------------------
// WARNING
//
// THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
//
// USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
// PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
// AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
//
// THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
//-----------------------------------------------------------------------------
// It is a reconstruction of the cipher engine used in iClass, and RFID techology.
//
// The implementation is based on the work performed by
// Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
// Milosch Meriac in the paper "Dismantling IClass".
//-----------------------------------------------------------------------------

#ifndef IKEYS_H
#define IKEYS_H

#include <inttypes.h>

/**
 * @brief
 *Definition 11. Let the function hash0 : F 82 × F 82 × (F 62 ) 8 → (F 82 ) 8 be defined as
 *  hash0(x, y, z [0] . . . z [7] ) = k [0] . . . k [7] where
 * z'[i] = (z[i] mod (63-i)) + i        i =  0...3
 * z'[i+4] = (z[i+4] mod (64-i)) + i    i =  0...3
 * ẑ = check(z');
 * @param c
 * @param k this is where the diversified key is put (should be 8 bytes)
 * @return
 */
void hash0(uint64_t c, uint8_t k[8]);
void invert_hash0(uint8_t k[8]);
int doKeyTests(void);
/**
 * @brief Performs Elite-class key diversification
 * @param csn
 * @param key
 * @param div_key
 */

void diversifyKey(uint8_t *csn, uint8_t *key, uint8_t *div_key);
/**
 * @brief Permutes a key from standard NIST format to Iclass specific format
 * @param key
 * @param dest
 */

#endif // IKEYS_H
