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54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "esp_secure_boot.h"
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#include "esp_log.h"
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#include "esp32s2/rom/secure_boot.h"
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static const char *TAG = "secure_boot";
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esp_err_t esp_secure_boot_permanently_enable(void)
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{
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uint8_t hash[32];
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if (esp_rom_efuse_is_secure_boot_enabled())
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{
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ESP_LOGI(TAG, "secure boot is already enabled, continuing..");
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return ESP_OK;
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}
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ESP_LOGI(TAG, "Verifying bootloader signature...\n");
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int r = ets_secure_boot_verify_bootloader(hash, false);
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if (r != ESP_OK) {
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ESP_LOGE(TAG, "Failed to verify bootloader signature");
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return r;
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}
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esp_efuse_batch_write_begin(); /* Batch all efuse writes at the end of this function */
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esp_efuse_write_field_bit(ESP_EFUSE_SECURE_BOOT_EN);
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esp_efuse_write_field_bit(ESP_EFUSE_DIS_BOOT_REMAP);
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esp_efuse_write_field_bit(ESP_EFUSE_DIS_LEGACY_SPI_BOOT);
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// TODO: also disable JTAG here, etc
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esp_err_t err = esp_efuse_batch_write_commit();
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if (err == ESP_OK) {
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assert(esp_rom_efuse_is_secure_boot_enabled());
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ESP_LOGI(TAG, "Secure boot permanently enabled");
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}
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return ESP_OK;
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}
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