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76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/**
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* \file havege.h
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*
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* \brief HAVEGE: HArdware Volatile Entropy Gathering and Expansion
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*
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* Copyright (C) 2006-2013, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MBEDTLS_HAVEGE_H
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#define MBEDTLS_HAVEGE_H
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#include <stddef.h>
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#define MBEDTLS_HAVEGE_COLLECT_SIZE 1024
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief HAVEGE state structure
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*/
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typedef struct
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{
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int PT1, PT2, offset[2];
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int pool[MBEDTLS_HAVEGE_COLLECT_SIZE];
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int WALK[8192];
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}
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mbedtls_havege_state;
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/**
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* \brief HAVEGE initialization
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*
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* \param hs HAVEGE state to be initialized
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*/
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void mbedtls_havege_init( mbedtls_havege_state *hs );
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/**
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* \brief Clear HAVEGE state
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*
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* \param hs HAVEGE state to be cleared
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*/
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void mbedtls_havege_free( mbedtls_havege_state *hs );
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/**
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* \brief HAVEGE rand function
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*
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* \param p_rng A HAVEGE state
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* \param output Buffer to fill
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* \param len Length of buffer
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*
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* \return 0
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*/
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int mbedtls_havege_random( void *p_rng, unsigned char *output, size_t len );
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#ifdef __cplusplus
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}
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#endif
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#endif /* havege.h */
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