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/**
* \file entropy_poll.h
*
* \brief Platform-specific and custom entropy polling functions
*
* Copyright (C) 2006-2011, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* 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.
*/
#ifndef POLARSSL_ENTROPY_POLL_H
#define POLARSSL_ENTROPY_POLL_H
#include <string.h>
#include "config.h"
#ifdef __cplusplus
extern "C" {
#endif
/*
* Default thresholds for built-in sources
*/
#define ENTROPY_MIN_PLATFORM 128 /**< Minimum for platform source */
#define ENTROPY_MIN_HAVEGE 128 /**< Minimum for HAVEGE */
#define ENTROPY_MIN_HARDCLOCK 32 /**< Minimum for hardclock() */
#if !defined(POLARSSL_NO_PLATFORM_ENTROPY)
/**
* \brief Platform-specific entropy poll callback
*/
int platform_entropy_poll( void *data,
unsigned char *output, size_t len, size_t *olen );
#endif
#if defined(POLARSSL_HAVEGE_C)
/**
* \brief HAVEGE based entropy poll callback
*
* Requires an HAVEGE state as its data pointer.
*/
int havege_poll( void *data,
unsigned char *output, size_t len, size_t *olen );
#endif
#if defined(POLARSSL_TIMING_C)
/**
* \brief hardclock-based entropy poll callback
*/
int hardclock_poll( void *data,
unsigned char *output, size_t len, size_t *olen );
#endif
#ifdef __cplusplus
}
#endif
#endif /* entropy_poll.h */
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