chacha.h

00001 /**
00002  * @file chacha.h
00003  * @brief ChaCha encryption algorithm
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 _CHACHA_H
00030 #define _CHACHA_H
00031 
00032 //Dependencies
00033 #include "crypto.h"
00034 
00035 
00036 /**
00037  * @brief ChaCha algorithm context
00038  **/
00039 
00040 typedef struct
00041 {
00042    uint_t nr;
00043    uint32_t state[16];
00044    uint32_t block[16];
00045    size_t pos;
00046 } ChachaContext;
00047 
00048 
00049 //ChaCha related functions
00050 error_t chachaInit(ChachaContext *context, uint_t nr, const uint8_t *key,
00051    size_t keyLength, const uint8_t *nonce, size_t nonceLength);
00052 
00053 void chachaCipher(ChachaContext *context, const uint8_t *input,
00054    uint8_t *output, size_t length);
00055 
00056 void chachaProcessBlock(ChachaContext *context);
00057 
00058 #endif
00059