kopia lustrzana https://github.com/espressif/esp-idf
77 wiersze
2.9 KiB
C
77 wiersze
2.9 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <string.h>
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#include "esp_flash_partitions.h"
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#include "esp_log.h"
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#include "esp_rom_md5.h"
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#include "esp_rom_spiflash.h"
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static const char *TAG = "flash_parts";
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esp_err_t esp_partition_table_verify(const esp_partition_info_t *partition_table, bool log_errors, int *num_partitions)
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{
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int md5_found = 0;
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size_t num_parts;
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uint32_t chip_size = g_rom_flashchip.chip_size;
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*num_partitions = 0;
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for (num_parts = 0; num_parts < ESP_PARTITION_TABLE_MAX_ENTRIES; num_parts++) {
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const esp_partition_info_t *part = &partition_table[num_parts];
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if (part->magic == ESP_PARTITION_MAGIC) {
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const esp_partition_pos_t *pos = &part->pos;
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if (pos->offset > chip_size || pos->offset + pos->size > chip_size) {
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if (log_errors) {
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ESP_LOGE(TAG, "partition %d invalid - offset 0x%x size 0x%x exceeds flash chip size 0x%x",
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num_parts, pos->offset, pos->size, chip_size);
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}
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return ESP_ERR_INVALID_SIZE;
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}
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} else if (part->magic == ESP_PARTITION_MAGIC_MD5) {
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if (md5_found) {
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if (log_errors) {
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ESP_LOGE(TAG, "Only one MD5 checksum is allowed");
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}
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return ESP_ERR_INVALID_STATE;
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}
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md5_context_t context;
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unsigned char digest[16];
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esp_rom_md5_init(&context);
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esp_rom_md5_update(&context, (unsigned char *) partition_table, num_parts * sizeof(esp_partition_info_t));
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esp_rom_md5_final(digest, &context);
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unsigned char *md5sum = ((unsigned char *) part) + ESP_PARTITION_MD5_OFFSET;
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if (memcmp(md5sum, digest, sizeof(digest)) != 0) {
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if (log_errors) {
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ESP_LOGE(TAG, "Incorrect MD5 checksum");
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}
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return ESP_ERR_INVALID_STATE;
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}
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//MD5 checksum matches and we continue with the next interation in
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//order to detect the end of the partition table
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md5_found = 1;
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} else if (part->magic == 0xFFFF
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&& part->type == PART_TYPE_END
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&& part->subtype == PART_SUBTYPE_END) {
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ESP_LOGD(TAG, "partition table verified, %d entries", num_parts);
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*num_partitions = num_parts - md5_found; //do not count the partition where the MD5 checksum is held
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return ESP_OK;
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} else {
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if (log_errors) {
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ESP_LOGE(TAG, "partition %d invalid magic number 0x%x", num_parts, part->magic);
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}
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return ESP_ERR_INVALID_STATE;
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}
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}
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if (log_errors) {
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ESP_LOGE(TAG, "partition table has no terminating entry, not valid");
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}
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return ESP_ERR_INVALID_STATE;
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}
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