ESP-IDF
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Outline
#include <stdlib.h>
#include "sdkconfig.h"
#include "esp_efuse.h"
#include "esp_efuse_utility.h"
#include "esp_efuse_table.h"
#include "esp_types.h"
#include "assert.h"
#include "esp_err.h"
#include "esp_fault.h"
#include "esp_log.h"
#include "soc/efuse_periph.h"
#include "sys/param.h"
TAG
#define APP_SEC_VER_SIZE_EFUSE_FIELD
#define APP_SEC_VER_SIZE_EFUSE_FIELD
esp_efuse_reset()
esp_efuse_read_secure_version()
esp_efuse_check_secure_version(uint32_t)
esp_efuse_update_secure_version(uint32_t)
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/efuse/src/esp_efuse_fields.c
 
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/* * SPDX-FileCopyrightText: 2017-2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include <stdlib.h> #include "sdkconfig.h" #include "esp_efuse.h" #include "esp_efuse_utility.h" #include "esp_efuse_table.h" #include "esp_types.h" #include "assert.h" #include "esp_err.h" #include "esp_fault.h" #include "esp_log.h" #include "soc/efuse_periph.h" #include "sys/param.h"12 includes static __attribute__((unused)) const char *TAG = "efuse"; #ifdef CONFIG_BOOTLOADER_APP_SEC_VER_SIZE_EFUSE_FIELD #define APP_SEC_VER_SIZE_EFUSE_FIELD CONFIG_BOOTLOADER_APP_SEC_VER_SIZE_EFUSE_FIELD #else #define APP_SEC_VER_SIZE_EFUSE_FIELD 4 // smallest possible size for all chips #endif // Reset efuse write registers void esp_efuse_reset(void) { esp_efuse_utility_reset(); }{ ... } uint32_t esp_efuse_read_secure_version(void) { uint32_t secure_version = 0; size_t size = MIN(APP_SEC_VER_SIZE_EFUSE_FIELD, esp_efuse_get_field_size(ESP_EFUSE_SECURE_VERSION)); esp_efuse_read_field_blob(ESP_EFUSE_SECURE_VERSION, &secure_version, size); return __builtin_popcount(secure_version & ((1ULL << size) - 1)); }{ ... } bool esp_efuse_check_secure_version(uint32_t secure_version) { uint32_t sec_ver_hw = esp_efuse_read_secure_version(); /* Additional copies for Anti FI check */ uint32_t sec_ver_hw_c1 = esp_efuse_read_secure_version(); uint32_t sec_ver_hw_c2 = esp_efuse_read_secure_version(); ESP_FAULT_ASSERT(sec_ver_hw == sec_ver_hw_c1); ESP_FAULT_ASSERT(sec_ver_hw == sec_ver_hw_c2); bool ret_status = (secure_version >= sec_ver_hw); /* Anti FI check */ ESP_FAULT_ASSERT(ret_status == (secure_version >= sec_ver_hw)); return ret_status; }{ ... } esp_err_t esp_efuse_update_secure_version(uint32_t secure_version) { size_t size = MIN(APP_SEC_VER_SIZE_EFUSE_FIELD, esp_efuse_get_field_size(ESP_EFUSE_SECURE_VERSION)); if (size < secure_version) { ESP_LOGE(TAG, "Max secure version is %u. Given %"PRIu32" version can not be written.", (unsigned)size, secure_version); return ESP_ERR_INVALID_ARG; }{...} esp_efuse_coding_scheme_t coding_scheme = esp_efuse_get_coding_scheme(ESP_EFUSE_SECURE_VERSION_NUM_BLOCK); if (coding_scheme != EFUSE_CODING_SCHEME_NONE) { ESP_LOGE(TAG, "Anti rollback is not supported with any coding scheme."); return ESP_ERR_NOT_SUPPORTED; }{...} uint32_t sec_ver_hw = esp_efuse_read_secure_version(); // If secure_version is the same as in eFuse field than it is ok just go out. if (sec_ver_hw < secure_version) { uint32_t num_bit_hw = (1ULL << sec_ver_hw) - 1; uint32_t num_bit_app = (1ULL << secure_version) - 1; // Repeated programming of programmed bits is strictly forbidden uint32_t new_bits = num_bit_app - num_bit_hw; // get only new bits esp_efuse_write_field_blob(ESP_EFUSE_SECURE_VERSION, &new_bits, size); ESP_LOGI(TAG, "Anti-rollback is set. eFuse field is updated(%"PRIu32").", secure_version); }{...} else if (sec_ver_hw > secure_version) { ESP_LOGE(TAG, "Anti-rollback is not set. secure_version of app is lower that eFuse field(%"PRIu32").", sec_ver_hw); return ESP_FAIL; }{...} return ESP_OK; }{ ... }
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