| Jens Wiklander | 32b3180 | 2023-10-06 16:59:46 +0200 | [diff] [blame] | 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 */ |