rc6.h

00001 /**
00002  * @file rc6.h
00003  * @brief RC6-32/20 block cipher
00004  *
00005  * @section License
00006  *
00007  * Copyright (C) 2010-2017 Oryx Embedded SARL. All rights reserved.
00008  *
00009  * This file is part of CycloneCrypto Open.
00010  *
00011  * This program is free software; you can redistribute it and/or
00012  * modify it under the terms of the GNU General Public License
00013  * as published by the Free Software Foundation; either version 2
00014  * of the License, or (at your option) any later version.
00015  *
00016  * This program is distributed in the hope that it will be useful,
00017  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019  * GNU General Public License for more details.
00020  *
00021  * You should have received a copy of the GNU General Public License
00022  * along with this program; if not, write to the Free Software Foundation,
00023  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00024  *
00025  * @author Oryx Embedded SARL (www.oryx-embedded.com)
00026  * @version 1.7.6
00027  **/
00028 
00029 #ifndef _RC6_H
00030 #define _RC6_H
00031 
00032 //Dependencies
00033 #include "crypto.h"
00034 
00035 //RC6 block size
00036 #define RC6_BLOCK_SIZE 16
00037 //Maximum length of the encryption key in bytes
00038 #define RC6_MAX_KEY_SIZE 32
00039 //Number of rounds
00040 #define RC6_NB_ROUNDS 20
00041 
00042 //Common interface for encryption algorithms
00043 #define RC6_CIPHER_ALGO (&rc6CipherAlgo)
00044 
00045 
00046 /**
00047  * @brief RC6 algorithm context
00048  **/
00049 
00050 typedef struct
00051 {
00052    uint32_t l[RC6_MAX_KEY_SIZE / 4];
00053    uint32_t s[2 * RC6_NB_ROUNDS + 4];
00054 } Rc6Context;
00055 
00056 
00057 //RC6 related constants
00058 extern const CipherAlgo rc6CipherAlgo;
00059 
00060 //RC6 related functions
00061 error_t rc6Init(Rc6Context *context, const uint8_t *key, size_t keyLength);
00062 void rc6EncryptBlock(Rc6Context *context, const uint8_t *input, uint8_t *output);
00063 void rc6DecryptBlock(Rc6Context *context, const uint8_t *input, uint8_t *output);
00064 
00065 #endif
00066