1 /** 2 * \file entropy_poll.h 3 * 4 * \brief Platform-specific and custom entropy polling functions 5 */ 6 /* 7 * Copyright The Mbed TLS Contributors 8 * SPDX-License-Identifier: Apache-2.0 9 * 10 * Licensed under the Apache License, Version 2.0 (the "License"); you may 11 * not use this file except in compliance with the License. 12 * You may obtain a copy of the License at 13 * 14 * http://www.apache.org/licenses/LICENSE-2.0 15 * 16 * Unless required by applicable law or agreed to in writing, software 17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 19 * See the License for the specific language governing permissions and 20 * limitations under the License. 21 */ 22 #ifndef MBEDTLS_ENTROPY_POLL_H 23 #define MBEDTLS_ENTROPY_POLL_H 24 25 #include "mbedtls/build_info.h" 26 27 #include <stddef.h> 28 29 #ifdef __cplusplus 30 extern "C" { 31 #endif 32 33 /* 34 * Default thresholds for built-in sources, in bytes 35 */ 36 #define MBEDTLS_ENTROPY_MIN_PLATFORM 32 /**< Minimum for platform source */ 37 #if !defined(MBEDTLS_ENTROPY_MIN_HARDWARE) 38 #define MBEDTLS_ENTROPY_MIN_HARDWARE 32 /**< Minimum for the hardware source */ 39 #endif 40 41 #if !defined(MBEDTLS_NO_PLATFORM_ENTROPY) 42 /** 43 * \brief Platform-specific entropy poll callback 44 */ 45 int mbedtls_platform_entropy_poll(void *data, 46 unsigned char *output, size_t len, size_t *olen); 47 #endif 48 49 #if defined(MBEDTLS_ENTROPY_HARDWARE_ALT) 50 /** 51 * \brief Entropy poll callback for a hardware source 52 * 53 * \warning This is not provided by mbed TLS! 54 * See \c MBEDTLS_ENTROPY_HARDWARE_ALT in mbedtls_config.h. 55 * 56 * \note This must accept NULL as its first argument. 57 */ 58 int mbedtls_hardware_poll(void *data, 59 unsigned char *output, size_t len, size_t *olen); 60 #endif 61 62 #if defined(MBEDTLS_ENTROPY_NV_SEED) 63 /** 64 * \brief Entropy poll callback for a non-volatile seed file 65 * 66 * \note This must accept NULL as its first argument. 67 */ 68 int mbedtls_nv_seed_poll(void *data, 69 unsigned char *output, size_t len, size_t *olen); 70 #endif 71 72 #ifdef __cplusplus 73 } 74 #endif 75 76 #endif /* entropy_poll.h */ 77
