Marco Zecchini
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Example_RTOS
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entropy_poll.h
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00001 /** 00002 * \file entropy_poll.h 00003 * 00004 * \brief Platform-specific and custom entropy polling functions 00005 * 00006 * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved 00007 * SPDX-License-Identifier: Apache-2.0 00008 * 00009 * Licensed under the Apache License, Version 2.0 (the "License"); you may 00010 * not use this file except in compliance with the License. 00011 * You may obtain a copy of the License at 00012 * 00013 * http://www.apache.org/licenses/LICENSE-2.0 00014 * 00015 * Unless required by applicable law or agreed to in writing, software 00016 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 00017 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00018 * See the License for the specific language governing permissions and 00019 * limitations under the License. 00020 * 00021 * This file is part of mbed TLS (https://tls.mbed.org) 00022 */ 00023 #ifndef MBEDTLS_ENTROPY_POLL_H 00024 #define MBEDTLS_ENTROPY_POLL_H 00025 00026 #if !defined(MBEDTLS_CONFIG_FILE) 00027 #include "config.h" 00028 #else 00029 #include MBEDTLS_CONFIG_FILE 00030 #endif 00031 00032 #include <stddef.h> 00033 00034 #ifdef __cplusplus 00035 extern "C" { 00036 #endif 00037 00038 /* 00039 * Default thresholds for built-in sources, in bytes 00040 */ 00041 #define MBEDTLS_ENTROPY_MIN_PLATFORM 32 /**< Minimum for platform source */ 00042 #define MBEDTLS_ENTROPY_MIN_HAVEGE 32 /**< Minimum for HAVEGE */ 00043 #define MBEDTLS_ENTROPY_MIN_HARDCLOCK 4 /**< Minimum for mbedtls_timing_hardclock() */ 00044 #if !defined(MBEDTLS_ENTROPY_MIN_HARDWARE) 00045 #define MBEDTLS_ENTROPY_MIN_HARDWARE 32 /**< Minimum for the hardware source */ 00046 #endif 00047 00048 /** 00049 * \brief Entropy poll callback that provides 0 entropy. 00050 */ 00051 #if defined(MBEDTLS_TEST_NULL_ENTROPY) 00052 int mbedtls_null_entropy_poll( void *data, 00053 unsigned char *output, size_t len, size_t *olen ); 00054 #endif 00055 00056 #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY) 00057 /** 00058 * \brief Platform-specific entropy poll callback 00059 */ 00060 int mbedtls_platform_entropy_poll( void *data, 00061 unsigned char *output, size_t len, size_t *olen ); 00062 #endif 00063 00064 #if defined(MBEDTLS_HAVEGE_C) 00065 /** 00066 * \brief HAVEGE based entropy poll callback 00067 * 00068 * Requires an HAVEGE state as its data pointer. 00069 */ 00070 int mbedtls_havege_poll( void *data, 00071 unsigned char *output, size_t len, size_t *olen ); 00072 #endif 00073 00074 #if defined(MBEDTLS_TIMING_C) 00075 /** 00076 * \brief mbedtls_timing_hardclock-based entropy poll callback 00077 */ 00078 int mbedtls_hardclock_poll( void *data, 00079 unsigned char *output, size_t len, size_t *olen ); 00080 #endif 00081 00082 #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT) 00083 /** 00084 * \brief Entropy poll callback for a hardware source 00085 * 00086 * \warning This is not provided by mbed TLS! 00087 * See \c MBEDTLS_ENTROPY_HARDWARE_ALT in config.h. 00088 * 00089 * \note This must accept NULL as its first argument. 00090 */ 00091 int mbedtls_hardware_poll( void *data, 00092 unsigned char *output, size_t len, size_t *olen ); 00093 #endif 00094 00095 #if defined(MBEDTLS_ENTROPY_NV_SEED) 00096 /** 00097 * \brief Entropy poll callback for a non-volatile seed file 00098 * 00099 * \note This must accept NULL as its first argument. 00100 */ 00101 int mbedtls_nv_seed_poll( void *data, 00102 unsigned char *output, size_t len, size_t *olen ); 00103 #endif 00104 00105 #ifdef __cplusplus 00106 } 00107 #endif 00108 00109 #endif /* entropy_poll.h */
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