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

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from __future__ import print_function
import binascii
from io import BytesIO
from collections import namedtuple
import os
import sys
import ttfw_idf
try:
import espsecure
except ImportError:
idf_path = os.getenv("IDF_PATH")
if not idf_path or not os.path.exists(idf_path):
raise
sys.path.insert(0, os.path.join(idf_path, "components", "esptool_py", "esptool"))
import espsecure
# 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
@ttfw_idf.idf_example_test(env_tag='Example_Flash_Encryption')
def test_examples_security_flash_encryption(env, extra_data):
dut = env.get_dut('flash_encryption', 'examples/security/flash_encryption', dut_class=ttfw_idf.ESP32DUT)
# start test
dut.start_app()
# 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(' ', ''))
# 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(b'\x00' * 32), 0xF, None)
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
]
for line in lines:
dut.expect(line, timeout=2)
if __name__ == '__main__':
test_examples_security_flash_encryption()