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112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/**
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* \file entropy_poll.h
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*
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* \brief Platform-specific and custom entropy polling functions
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*/
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/*
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* Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: GPL-2.0
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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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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_ENTROPY_POLL_H
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#define MBEDTLS_ENTROPY_POLL_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <stddef.h>
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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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* Default thresholds for built-in sources, in bytes
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*/
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#define MBEDTLS_ENTROPY_MIN_PLATFORM 32 /**< Minimum for platform source */
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#define MBEDTLS_ENTROPY_MIN_HAVEGE 32 /**< Minimum for HAVEGE */
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#define MBEDTLS_ENTROPY_MIN_HARDCLOCK 4 /**< Minimum for mbedtls_timing_hardclock() */
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#if !defined(MBEDTLS_ENTROPY_MIN_HARDWARE)
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#define MBEDTLS_ENTROPY_MIN_HARDWARE 32 /**< Minimum for the hardware source */
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#endif
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/**
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* \brief Entropy poll callback that provides 0 entropy.
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*/
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#if defined(MBEDTLS_TEST_NULL_ENTROPY)
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int mbedtls_null_entropy_poll(void *data,
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unsigned char *output, size_t len, size_t *olen);
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#endif
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#if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
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/**
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* \brief Platform-specific entropy poll callback
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*/
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int mbedtls_platform_entropy_poll(void *data,
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unsigned char *output, size_t len, size_t *olen);
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#endif
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#if defined(MBEDTLS_HAVEGE_C)
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/**
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* \brief HAVEGE based entropy poll callback
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*
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* Requires an HAVEGE state as its data pointer.
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*/
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int mbedtls_havege_poll(void *data,
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unsigned char *output, size_t len, size_t *olen);
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#endif
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#if defined(MBEDTLS_TIMING_C)
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/**
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* \brief mbedtls_timing_hardclock-based entropy poll callback
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*/
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int mbedtls_hardclock_poll(void *data,
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unsigned char *output, size_t len, size_t *olen);
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#endif
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#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
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/**
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* \brief Entropy poll callback for a hardware source
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*
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* \warning This is not provided by mbed TLS!
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* See \c MBEDTLS_ENTROPY_HARDWARE_ALT in config.h.
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*
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* \note This must accept NULL as its first argument.
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*/
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int mbedtls_hardware_poll(void *data,
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unsigned char *output, size_t len, size_t *olen);
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#endif
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#if defined(MBEDTLS_ENTROPY_NV_SEED)
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/**
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* \brief Entropy poll callback for a non-volatile seed file
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*
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* \note This must accept NULL as its first argument.
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*/
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int mbedtls_nv_seed_poll(void *data,
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unsigned char *output, size_t len, size_t *olen);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* entropy_poll.h */
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