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flash_encrypt: Adds API to switch flash encryption "Development" to "Release"

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KonstantinKondrashov
2021-05-18 02:33:05 +08:00
parent 4d604ee6d2
commit 57c7ebc4bc
2 changed files with 56 additions and 1 deletions
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10
components/bootloader_support/include/esp_flash_encrypt.h
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@@ -171,6 +171,16 @@ void esp_flash_encryption_init_checks(void);
*/ */
esp_err_t esp_flash_encryption_enable_secure_features(void); esp_err_t esp_flash_encryption_enable_secure_features(void);
/** @brief Switches Flash Encryption from "Development" to "Release"
*
* If already in "Release" mode, the function will do nothing.
* If flash encryption efuse is not enabled yet then abort.
* It burns:
* - "disable encrypt in dl mode"
* - set FLASH_CRYPT_CNT efuse to max
*/
void esp_flash_encryption_set_release_mode(void);
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif

47
components/bootloader_support/src/flash_encrypt.c
View File

@@ -20,8 +20,8 @@
#define WR_DIS_CRYPT_CNT ESP_EFUSE_WR_DIS_SPI_BOOT_CRYPT_CNT #define WR_DIS_CRYPT_CNT ESP_EFUSE_WR_DIS_SPI_BOOT_CRYPT_CNT
#endif #endif
#ifndef BOOTLOADER_BUILD
static const char *TAG = "flash_encrypt"; static const char *TAG = "flash_encrypt";
#ifndef BOOTLOADER_BUILD
void esp_flash_encryption_init_checks() void esp_flash_encryption_init_checks()
{ {
@@ -138,3 +138,48 @@ esp_flash_enc_mode_t esp_get_flash_encryption_mode(void)
return mode; return mode;
} }
void esp_flash_encryption_set_release_mode(void)
{
esp_flash_enc_mode_t mode = esp_get_flash_encryption_mode();
if (mode == ESP_FLASH_ENC_MODE_RELEASE) {
return;
}
if (mode == ESP_FLASH_ENC_MODE_DISABLED) {
ESP_LOGE(TAG, "Flash encryption eFuse is not enabled, abort..");
abort();
return;
}
// ESP_FLASH_ENC_MODE_DEVELOPMENT -> ESP_FLASH_ENC_MODE_RELEASE
esp_efuse_batch_write_begin();
if (!esp_efuse_read_field_bit(WR_DIS_CRYPT_CNT)) {
size_t flash_crypt_cnt = 0;
esp_efuse_read_field_cnt(CRYPT_CNT, &flash_crypt_cnt);
if (flash_crypt_cnt != CRYPT_CNT[0]->bit_count) {
esp_efuse_write_field_cnt(CRYPT_CNT, CRYPT_CNT[0]->bit_count - flash_crypt_cnt);
}
}
#if CONFIG_IDF_TARGET_ESP32
esp_efuse_write_field_bit(ESP_EFUSE_DISABLE_DL_CACHE);
esp_efuse_write_field_bit(ESP_EFUSE_DISABLE_DL_ENCRYPT);
esp_efuse_write_field_bit(ESP_EFUSE_DISABLE_DL_DECRYPT);
#elif CONFIG_IDF_TARGET_ESP32S2
esp_efuse_write_field_bit(ESP_EFUSE_DIS_DOWNLOAD_MANUAL_ENCRYPT);
esp_efuse_write_field_bit(ESP_EFUSE_DIS_DOWNLOAD_ICACHE);
esp_efuse_write_field_bit(ESP_EFUSE_DIS_DOWNLOAD_DCACHE);
#elif CONFIG_IDF_TARGET_ESP32C3
esp_efuse_write_field_bit(ESP_EFUSE_DIS_DOWNLOAD_MANUAL_ENCRYPT);
esp_efuse_write_field_bit(ESP_EFUSE_DIS_DOWNLOAD_ICACHE);
#else
ESP_LOGE(TAG, "Flash Encryption support not added, abort..");
abort();
#endif
esp_efuse_disable_rom_download_mode();
esp_efuse_batch_write_commit();
if (esp_get_flash_encryption_mode() != ESP_FLASH_ENC_MODE_RELEASE) {
ESP_LOGE(TAG, "Flash encryption mode is DEVELOPMENT, abort..");
abort();
}
ESP_LOGI(TAG, "Flash encryption mode is RELEASE");
}