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109 lines
2.3 KiB
109 lines
2.3 KiB
/** @file |
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* @brief mbed TLS initialization |
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* |
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* Initialize the mbed TLS library like setup the heap etc. |
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*/ |
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/* |
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* Copyright (c) 2017 Intel Corporation |
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* |
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* SPDX-License-Identifier: Apache-2.0 |
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*/ |
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#include <zephyr/init.h> |
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#include <zephyr/app_memory/app_memdomain.h> |
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#include <zephyr/drivers/entropy.h> |
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#include <zephyr/random/rand32.h> |
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#include <mbedtls/entropy.h> |
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#include <mbedtls/debug.h> |
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#if defined(CONFIG_MBEDTLS) |
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#if !defined(CONFIG_MBEDTLS_CFG_FILE) |
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#include "mbedtls/config.h" |
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#else |
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#include CONFIG_MBEDTLS_CFG_FILE |
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#endif /* CONFIG_MBEDTLS_CFG_FILE */ |
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#endif |
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#if defined(CONFIG_MBEDTLS_ENABLE_HEAP) && \ |
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defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C) |
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#include <mbedtls/memory_buffer_alloc.h> |
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#if !defined(CONFIG_MBEDTLS_HEAP_SIZE) |
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#error "Please set heap size to be used. Set value to CONFIG_MBEDTLS_HEAP_SIZE \ |
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option." |
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#endif |
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static unsigned char _mbedtls_heap[CONFIG_MBEDTLS_HEAP_SIZE]; |
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static void init_heap(void) |
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{ |
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mbedtls_memory_buffer_alloc_init(_mbedtls_heap, sizeof(_mbedtls_heap)); |
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} |
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#else |
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#define init_heap(...) |
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#endif /* CONFIG_MBEDTLS_ENABLE_HEAP && MBEDTLS_MEMORY_BUFFER_ALLOC_C */ |
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#if defined(CONFIG_MBEDTLS_ZEPHYR_ENTROPY) |
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static const struct device *const entropy_dev = |
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DEVICE_DT_GET_OR_NULL(DT_CHOSEN(zephyr_entropy)); |
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int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, |
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size_t *olen) |
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{ |
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int ret; |
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uint16_t request_len = len > UINT16_MAX ? UINT16_MAX : len; |
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ARG_UNUSED(data); |
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if (output == NULL || olen == NULL || len == 0) { |
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return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED; |
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} |
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if (!IS_ENABLED(CONFIG_ENTROPY_HAS_DRIVER)) { |
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sys_rand_get(output, len); |
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*olen = len; |
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return 0; |
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} |
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if (!device_is_ready(entropy_dev)) { |
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return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED; |
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} |
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ret = entropy_get_entropy(entropy_dev, (uint8_t *)output, request_len); |
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if (ret < 0) { |
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return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED; |
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} |
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*olen = request_len; |
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return 0; |
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} |
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#endif /* CONFIG_MBEDTLS_ZEPHYR_ENTROPY */ |
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static int _mbedtls_init(void) |
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{ |
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init_heap(); |
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#if defined(CONFIG_MBEDTLS_DEBUG_LEVEL) |
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mbedtls_debug_set_threshold(CONFIG_MBEDTLS_DEBUG_LEVEL); |
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#endif |
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return 0; |
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} |
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#if defined(CONFIG_MBEDTLS_INIT) |
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SYS_INIT(_mbedtls_init, POST_KERNEL, 0); |
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#endif |
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/* if CONFIG_MBEDTLS_INIT is not defined then this function |
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* should be called by the platform before any mbedtls functionality |
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* is used |
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*/ |
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int mbedtls_init(void) |
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{ |
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return _mbedtls_init(); |
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}
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