ESP-IDF
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Outline
#include <string.h>
#include "esp_flash_partitions.h"
#include "esp_log.h"
#include "esp_rom_md5.h"
#include "esp_rom_spiflash.h"
TAG
esp_partition_table_verify(const esp_partition_info_t *, bool, int *)
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/bootloader_support/src/flash_partitions.c
 
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/* * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include <string.h> #include "esp_flash_partitions.h" #include "esp_log.h" #include "esp_rom_md5.h" #include "esp_rom_spiflash.h"5 includes static const char *TAG = "flash_parts"; esp_err_t esp_partition_table_verify(const esp_partition_info_t *partition_table, bool log_errors, int *num_partitions) { int md5_found = 0; size_t num_parts; uint32_t chip_size = g_rom_flashchip.chip_size; *num_partitions = 0; for (num_parts = 0; num_parts < ESP_PARTITION_TABLE_MAX_ENTRIES; num_parts++) { const esp_partition_info_t *part = &partition_table[num_parts]; if (part->magic == ESP_PARTITION_MAGIC) { const esp_partition_pos_t *pos = &part->pos; if (pos->offset > chip_size || pos->offset + pos->size > chip_size) { if (log_errors) { ESP_LOGE(TAG, "partition %d invalid - offset 0x%"PRIx32" size 0x%"PRIx32" exceeds flash chip size 0x%"PRIx32, num_parts, pos->offset, pos->size, chip_size); }{...} return ESP_ERR_INVALID_SIZE; }{...} }{...} else if (part->magic == ESP_PARTITION_MAGIC_MD5) { if (md5_found) { if (log_errors) { ESP_LOGE(TAG, "Only one MD5 checksum is allowed"); }{...} return ESP_ERR_INVALID_STATE; }{...} md5_context_t context; unsigned char digest[16]; esp_rom_md5_init(&context); esp_rom_md5_update(&context, (unsigned char *) partition_table, num_parts * sizeof(esp_partition_info_t)); esp_rom_md5_final(digest, &context); unsigned char *md5sum = ((unsigned char *) part) + ESP_PARTITION_MD5_OFFSET; if (memcmp(md5sum, digest, sizeof(digest)) != 0) { if (log_errors) { ESP_LOGE(TAG, "Incorrect MD5 checksum"); }{...} return ESP_ERR_INVALID_STATE; }{...} //MD5 checksum matches and we continue with the next interation in //order to detect the end of the partition table md5_found = 1; }{...} else if (part->magic == 0xFFFF && part->type == PART_TYPE_END && part->subtype == PART_SUBTYPE_END) { ESP_LOGD(TAG, "partition table verified, %d entries", num_parts); *num_partitions = num_parts - md5_found; //do not count the partition where the MD5 checksum is held return ESP_OK; }{...} else { if (log_errors) { ESP_LOGE(TAG, "partition %d invalid magic number 0x%x", num_parts, part->magic); }{...} return ESP_ERR_INVALID_STATE; }{...} }{...} if (log_errors) { ESP_LOGE(TAG, "partition table has no terminating entry, not valid"); }{...} return ESP_ERR_INVALID_STATE; }{ ... }
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