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esp-idf/examples/security/flash_encryption/README.md

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build_app: make multi target support readable
2020-04-09 08:40:57 +00:00
| Supported Targets | ESP32 |
| ----------------- | ----- |
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
# Flash Encryption
spi_flash: remove duplicate definition of spi_flash_unlock The other (static) definition is in flash_ops.c, all references are also in flash_ops.c.
2019-08-23 04:37:55 +00:00
The example checks if the flash encryption feature is enabled/disabled and if enabled prints the flash encryption mode (DEVELOPMENT / RELEASE) and FLASH_CRYPT_CNT eFuse value.
The example also demonstrates writing and reading encrypted partitions in flash.
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
## How to use example
### Hardware Required
### Configure the project
```
examples: change default build instructions in docs to CMake
2019-08-02 03:31:20 +00:00
idf.py menuconfig
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
```
* Enable the flash encryption mode (Development or Release) under Security Features. Default usage mode is Development (recommended during test and development phase).
* Ensure Bootloader log verbosity is Info under Bootloader config.
* Select Single factory app, no OTA under Partition Table options. Change the partition table offset to 0x9000 from 0x8000 since after enabling flash encryption the size of bootloader is increased.
### Build and Flash
spi_flash: remove duplicate definition of spi_flash_unlock The other (static) definition is in flash_ops.c, all references are also in flash_ops.c.
2019-08-23 04:37:55 +00:00
When building the project and flashing it to the board FOR THE FIRST TIME after enabling flash encryption feature in menuconfig, run following command to program ESP32 and monitor the output:
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
```
examples: change default build instructions in docs to CMake
2019-08-02 03:31:20 +00:00
idf.py -p PORT flash monitor
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
```
(To exit the serial monitor, type ``Ctrl-]``.)
See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
spi_flash: remove duplicate definition of spi_flash_unlock The other (static) definition is in flash_ops.c, all references are also in flash_ops.c.
2019-08-23 04:37:55 +00:00
When reprogramming the device subsequently use following command for encrypted write of new plaintext application:
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
```
spi_flash: remove duplicate definition of spi_flash_unlock The other (static) definition is in flash_ops.c, all references are also in flash_ops.c.
2019-08-23 04:37:55 +00:00
idf.py -p PORT encrypted-app-flash monitor
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
```
spi_flash: remove duplicate definition of spi_flash_unlock The other (static) definition is in flash_ops.c, all references are also in flash_ops.c.
2019-08-23 04:37:55 +00:00
Please note above command programs only the app partition. In order to reprogram all partitions (bootloader, partition table and application) in encrypted form use:
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
```
spi_flash: remove duplicate definition of spi_flash_unlock The other (static) definition is in flash_ops.c, all references are also in flash_ops.c.
2019-08-23 04:37:55 +00:00
idf.py -p PORT encrypted-flash monitor
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
```
## Example Output
spi_flash: remove duplicate definition of spi_flash_unlock The other (static) definition is in flash_ops.c, all references are also in flash_ops.c.
2019-08-23 04:37:55 +00:00
When running the example without enabling flash encryption, the output would be as follows:
```
Example to check Flash Encryption status
This is ESP32 chip with 2 CPU cores, WiFi/BT/BLE, silicon revision 0, 2MB external flash
FLASH_CRYPT_CNT eFuse value is 0
Flash encryption feature is disabled
Erasing partition "storage" (0x1000 bytes)
Writing data with esp_partition_write:
I (378) example: 0x3ffb4dc0 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f |................|
I (378) example: 0x3ffb4dd0 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f |................|
Reading with esp_partition_read:
I (388) example: 0x3ffb4da0 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f |................|
I (398) example: 0x3ffb4db0 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f |................|
Reading with spi_flash_read:
I (408) example: 0x3ffb4da0 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f |................|
I (418) example: 0x3ffb4db0 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f |................|
```
After enabling flash encryption in Development mode, the output shows the process of enabling the flash encryption:
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
```
I (168) boot: Checking flash encryption...
I (168) flash_encrypt: Generating new flash encryption key...
I (187) flash_encrypt: Read & write protecting new key...
I (187) flash_encrypt: Setting CRYPT_CONFIG efuse to 0xF
W (188) flash_encrypt: Not disabling UART bootloader encryption
I (195) flash_encrypt: Disable UART bootloader decryption...
I (201) flash_encrypt: Disable UART bootloader MMU cache...
I (208) flash_encrypt: Disable JTAG...
I (212) flash_encrypt: Disable ROM BASIC interpreter fallback...
....
....
....
I (13229) flash_encrypt: Flash encryption completed
I (13229) boot: Resetting with flash encryption enabled...
```
spi_flash: remove duplicate definition of spi_flash_unlock The other (static) definition is in flash_ops.c, all references are also in flash_ops.c.
2019-08-23 04:37:55 +00:00
Once the flash encryption is enabled the device will reset itself. At this stage the flash contents are in encrypted form. The output would be similar to:
```
Example to check Flash Encryption status
This is ESP32 chip with 2 CPU cores, WiFi/BT/BLE, silicon revision 0, 4MB external flash
FLASH_CRYPT_CNT eFuse value is 1
Flash encryption feature is enabled in DEVELOPMENT mode
Erasing partition "storage" (0x1000 bytes)
Writing data with esp_partition_write:
I (451) example: 0x3ffb4dc0 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f |................|
I (451) example: 0x3ffb4dd0 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f |................|
Reading with esp_partition_read:
I (461) example: 0x3ffb4da0 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f |................|
I (471) example: 0x3ffb4db0 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f |................|
Reading with spi_flash_read:
I (491) example: 0x3ffb4da0 29 68 2e 13 88 a0 5b 7f cc 6b 39 f9 d7 7b 32 2f |)h....[..k9..{2/|
I (491) example: 0x3ffb4db0 9f e6 55 37 4b 91 b0 83 cd a6 e9 4e cd fa b4 c7 |..U7K......N....|
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
```
## Troubleshooting
It is also possible to use esptool.py utility to read the eFuse values and check if flash encryption is enabled or not
```
spi_flash: remove duplicate definition of spi_flash_unlock The other (static) definition is in flash_ops.c, all references are also in flash_ops.c.
2019-08-23 04:37:55 +00:00
python $IDF_PATH/components/esptool_py/esptool/espefuse.py --port PORT summary
Improve flash encryption documentation and add Development & Release modes This MR improves existing flash encryption document to provide simplified steps Adds two new modes for user: Development & Release Adds a simple example Supports encrypted write through make command
2019-01-21 14:14:56 +00:00
```
If FLASH_CRYPT_CNT eFuse value is non-zero flash encryption is enabled