chacha.h

00001 /* chacha.h
00002  *
00003  * Copyright (C) 2006-2016 wolfSSL Inc.
00004  *
00005  * This file is part of wolfSSL.
00006  *
00007  * wolfSSL 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  * wolfSSL 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 02110-1335, USA
00020  */
00021 
00022 
00023 #ifndef WOLF_CRYPT_CHACHA_H
00024 #define WOLF_CRYPT_CHACHA_H
00025 
00026 #include <wolfssl/wolfcrypt/types.h>
00027 
00028 #ifdef HAVE_CHACHA
00029 
00030 #ifdef __cplusplus
00031     extern "C" {
00032 #endif
00033 
00034 enum {
00035     CHACHA_ENC_TYPE = 7     /* cipher unique type */
00036 };
00037 
00038 typedef struct ChaCha {
00039     word32 X[16];           /* state of cipher */
00040 } ChaCha;
00041 
00042 /**
00043   * IV(nonce) changes with each record
00044   * counter is for what value the block counter should start ... usually 0
00045   */
00046 WOLFSSL_API int wc_Chacha_SetIV(ChaCha* ctx, const byte* inIv, word32 counter);
00047 
00048 WOLFSSL_API int wc_Chacha_Process(ChaCha* ctx, byte* cipher, const byte* plain,
00049                               word32 msglen);
00050 WOLFSSL_API int wc_Chacha_SetKey(ChaCha* ctx, const byte* key, word32 keySz);
00051 
00052 #ifdef __cplusplus
00053     } /* extern "C" */
00054 #endif
00055 
00056 #endif /* HAVE_CHACHA */
00057 #endif /* WOLF_CRYPT_CHACHA_H */
00058 
00059