esp-idf/examples/security/flash_encryption/pytest_flash_encryption.py

69 lines
2.6 KiB
Python

# SPDX-FileCopyrightText: 2018-2022 Espressif Systems (Shanghai) CO LTD
# SPDX-License-Identifier: Apache-2.0
from __future__ import print_function
import binascii
from collections import namedtuple
from io import BytesIO
import espsecure
import pytest
from pytest_embedded import Dut
# To prepare a test runner for this example:
# 1. Generate zero flash encryption key:
# dd if=/dev/zero of=key.bin bs=1 count=32
# 2.Burn Efuses:
# espefuse.py --do-not-confirm -p $ESPPORT burn_efuse FLASH_CRYPT_CONFIG 0xf
# espefuse.py --do-not-confirm -p $ESPPORT burn_efuse FLASH_CRYPT_CNT 0x1
# espefuse.py --do-not-confirm -p $ESPPORT burn_key flash_encryption key.bin
@pytest.mark.esp32
@pytest.mark.esp32c3
@pytest.mark.flash_encryption
def test_examples_security_flash_encryption(dut: Dut) -> None:
# Erase the nvs_key partition
dut.serial.erase_partition('nvs_key')
# calculate the expected ciphertext
flash_addr = dut.app.partition_table['storage']['offset']
plain_hex_str = '00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f'
plain_data = binascii.unhexlify(plain_hex_str.replace(' ', ''))
# espsecure uses the cryptography package for encrypting
# with aes-xts, but does not allow for a symmetric key
# so the key for later chips are not all zeros
if dut.target == 'esp32':
key_bytes = b'\x00' * 32
aes_xts = False
else:
key_bytes = b'\xff' + b'\x00' * 31
aes_xts = True
# Emulate espsecure encrypt_flash_data command
EncryptFlashDataArgs = namedtuple('EncryptFlashDataArgs', ['output', 'plaintext_file', 'address', 'keyfile', 'flash_crypt_conf', 'aes_xts'])
args = EncryptFlashDataArgs(BytesIO(), BytesIO(plain_data), flash_addr, BytesIO(key_bytes), 0xF, aes_xts)
espsecure.encrypt_flash_data(args)
expected_ciphertext = args.output.getvalue()
hex_ciphertext = binascii.hexlify(expected_ciphertext).decode('ascii')
expected_str = (' '.join(hex_ciphertext[i:i + 2] for i in range(0, 16, 2)) + ' ' +
' '.join(hex_ciphertext[i:i + 2] for i in range(16, 32, 2)))
lines = [
'FLASH_CRYPT_CNT eFuse value is 1',
'Flash encryption feature is enabled in DEVELOPMENT mode',
'with esp_partition_write',
plain_hex_str,
'with esp_partition_read',
plain_hex_str,
'with spi_flash_read',
expected_str,
# The status of NVS encryption for the "nvs" partition
'NVS partition "nvs" is encrypted.',
# The status of NVS encryption for the "custom_nvs" partition
'NVS partition "custom_nvs" is encrypted.'
]
for line in lines:
dut.expect(line, timeout=2)