crypto_prng.h

00001 /*
00002 MiniTLS - A super trimmed down TLS/SSL Library for embedded devices
00003 Author: Donatien Garnier
00004 Copyright (C) 2013-2014 AppNearMe Ltd
00005 
00006 This program is free software; you can redistribute it and/or
00007 modify it under the terms of the GNU General Public License
00008 as published by the Free Software Foundation; either version 2
00009 of the License, or (at your option) any later version.
00010 
00011 This program is distributed in the hope that it will be useful,
00012 but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 GNU General Public License for more details.
00015 
00016 You should have received a copy of the GNU General Public License
00017 along with this program; if not, write to the Free Software
00018 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
00019 *//**
00020  * \file crypto_prng.h
00021  * \copyright Copyright (c) AppNearMe Ltd 2013
00022  * \author Donatien Garnier
00023  */
00024 
00025 #ifndef CRYPTO_PRNG_H_
00026 #define CRYPTO_PRNG_H_
00027 
00028 #ifdef __cplusplus
00029 extern "C" {
00030 #endif
00031 
00032 #include "core/fwk.h"
00033 #include "inc/minitls_errors.h"
00034 
00035 #include "crypto_aes_128.h"
00036 #include "crypto_sha1.h"
00037 
00038 //This PRNG is based on Yarrow (AES128 + SHA1)
00039 
00040 typedef struct __crypto_prng
00041 {
00042   crypto_aes_128_t cipher;
00043   //crypto_sha1_t hash;
00044   uint32_t counter;
00045   uint8_t pool[SHA1_SIZE];
00046   uint8_t buf[AES_128_BLOCK_SIZE];
00047   size_t buf_pos;
00048   bool fed;
00049   rtos_mtx_t* mtx;
00050 }
00051 crypto_prng_t;
00052 
00053 //Thread safe if mutex supplied (can be NULL)
00054 void crypto_prng_init(crypto_prng_t* prng, rtos_mtx_t* mtx);
00055 void crypto_prng_feed(crypto_prng_t* prng, uint8_t* data, size_t size);
00056 void crypto_prng_update(crypto_prng_t* prng);
00057 void crypto_prng_get(crypto_prng_t* prng, uint8_t* data, size_t size);
00058 
00059 #ifdef __cplusplus
00060 }
00061 #endif
00062 
00063 #endif /* CRYPTO_PRNG_H_ */