chacha.h

00001 /* chacha.h
00002  *
00003  * Copyright (C) 2006-2014 wolfSSL Inc.
00004  *
00005  * This file is part of CyaSSL.
00006  *
00007  * CyaSSL is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2 of the License, or
00010  * (at your option) any later version.
00011  *
00012  * CyaSSL is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
00020  */
00021 
00022 #ifndef CTAO_CRYPT_CHACHA_H
00023 #define CTAO_CRYPT_CHACHA_H
00024 
00025 #include "types.h"
00026 
00027 #ifdef __cplusplus
00028     extern "C" {
00029 #endif
00030 
00031 
00032 enum {
00033     CHACHA_ENC_TYPE = 7     /* cipher unique type */
00034 };
00035 
00036 typedef struct ChaCha {
00037     word32 X[16];           /* state of cipher */
00038 } ChaCha;
00039 
00040 CYASSL_API int Chacha_Process(ChaCha* ctx, byte* cipher, const byte* plain,
00041                               word32 msglen);
00042 CYASSL_API int Chacha_SetKey(ChaCha* ctx, const byte* key, word32 keySz);
00043 
00044 /**
00045   * IV(nonce) changes with each record 
00046   * counter is for what value the block counter should start ... usually 0
00047   */
00048 CYASSL_API int Chacha_SetIV(ChaCha* ctx, const byte* inIv, word32 counter);
00049 
00050 #ifdef __cplusplus
00051     } /* extern "C" */
00052 #endif
00053 
00054 #endif
00055