include/mbedtls/entropy_poll.h (mbedTLS)

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/** * \file entropy_poll.h * * \brief Platform-specific and custom entropy polling functions */ /* * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * This file is part of mbed TLS (https://tls.mbed.org) */ #ifndef MBEDTLS_ENTROPY_POLL_H #define MBEDTLS_ENTROPY_POLL_H #if !defined(MBEDTLS_CONFIG_FILE) #include "config.h" #else #include MBEDTLS_CONFIG_FILE #endif #include <stddef.h> #ifdef __cplusplus extern "C" { #endif /* * Default thresholds for built-in sources, in bytes */ #define MBEDTLS_ENTROPY_MIN_PLATFORM 32 /**< Minimum for platform source */ #define MBEDTLS_ENTROPY_MIN_HAVEGE 32 /**< Minimum for HAVEGE */ #define MBEDTLS_ENTROPY_MIN_HARDCLOCK 4 /**< Minimum for mbedtls_timing_hardclock() */ #if !defined(MBEDTLS_ENTROPY_MIN_HARDWARE) #define MBEDTLS_ENTROPY_MIN_HARDWARE 32 /**< Minimum for the hardware source */ #endif /** * \brief Entropy poll callback that provides 0 entropy. */ #if defined(MBEDTLS_TEST_NULL_ENTROPY) int mbedtls_null_entropy_poll( void *data, unsigned char *output, size_t len, size_t *olen ); #endif #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY) /** * \brief Platform-specific entropy poll callback */ int mbedtls_platform_entropy_poll( void *data, unsigned char *output, size_t len, size_t *olen ); #endif #if defined(MBEDTLS_HAVEGE_C) /** * \brief HAVEGE based entropy poll callback * * Requires an HAVEGE state as its data pointer. */ int mbedtls_havege_poll( void *data, unsigned char *output, size_t len, size_t *olen ); #endif #if defined(MBEDTLS_TIMING_C) /** * \brief mbedtls_timing_hardclock-based entropy poll callback */ int mbedtls_hardclock_poll( void *data, unsigned char *output, size_t len, size_t *olen ); #endif #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT) /** * \brief Entropy poll callback for a hardware source * * \warning This is not provided by mbed TLS! * See \c MBEDTLS_ENTROPY_HARDWARE_ALT in config.h. * * \note This must accept NULL as its first argument. */ int mbedtls_hardware_poll( void *data, unsigned char *output, size_t len, size_t *olen ); #endif #if defined(MBEDTLS_ENTROPY_NV_SEED) /** * \brief Entropy poll callback for a non-volatile seed file * * \note This must accept NULL as its first argument. */ int mbedtls_nv_seed_poll( void *data, unsigned char *output, size_t len, size_t *olen ); #endif #ifdef __cplusplus } #endif #endif /* entropy_poll.h */