| /** |
| * \file entropy_poll.h |
| * |
| * \brief Platform-specific and custom entropy polling functions |
| */ |
| /* |
| * Copyright The Mbed TLS Contributors |
| * 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. |
| */ |
| #ifndef MBEDTLS_ENTROPY_POLL_H |
| #define MBEDTLS_ENTROPY_POLL_H |
| |
| #if !defined(MBEDTLS_CONFIG_FILE) |
| #include "mbedtls/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_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_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 */ |