acl/include/mbedtls/2.16.3/havege.h

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2019-12-17 18:32:11 +08:00
/**
* \file havege.h
*
* \brief HAVEGE: HArdware Volatile Entropy Gathering and Expansion
*/
/*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: GPL-2.0
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#ifndef MBEDTLS_HAVEGE_H
#define MBEDTLS_HAVEGE_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include <stddef.h>
#define MBEDTLS_HAVEGE_COLLECT_SIZE 1024
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief HAVEGE state structure
*/
typedef struct mbedtls_havege_state
{
int PT1, PT2, offset[2];
int pool[MBEDTLS_HAVEGE_COLLECT_SIZE];
int WALK[8192];
}
mbedtls_havege_state;
/**
* \brief HAVEGE initialization
*
* \param hs HAVEGE state to be initialized
*/
void mbedtls_havege_init( mbedtls_havege_state *hs );
/**
* \brief Clear HAVEGE state
*
* \param hs HAVEGE state to be cleared
*/
void mbedtls_havege_free( mbedtls_havege_state *hs );
/**
* \brief HAVEGE rand function
*
* \param p_rng A HAVEGE state
* \param output Buffer to fill
* \param len Length of buffer
*
* \return 0
*/
int mbedtls_havege_random( void *p_rng, unsigned char *output, size_t len );
#ifdef __cplusplus
}
#endif
#endif /* havege.h */