mirror of
https://github.com/espressif/esp-idf.git
synced 2024-09-21 06:56:11 -04:00
315 lines
10 KiB
Python
315 lines
10 KiB
Python
#!/usr/bin/env python
|
|
# Copyright 2020 Espressif Systems (Shanghai) Co., Ltd.
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
import argparse
|
|
import os
|
|
import sys
|
|
import hashlib
|
|
import hmac
|
|
import struct
|
|
from cryptography.hazmat.backends import default_backend
|
|
from cryptography.hazmat.primitives import serialization
|
|
from cryptography.hazmat.primitives.asymmetric import rsa
|
|
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
|
|
from cryptography.utils import int_to_bytes
|
|
|
|
try:
|
|
import esptool
|
|
import espefuse
|
|
except ImportError:
|
|
idf_path = os.getenv("IDF_PATH")
|
|
if not idf_path or not os.path.exists(idf_path):
|
|
raise Exception("IDF_PATH not found")
|
|
sys.path.insert(0, os.path.join(idf_path, "components", "esptool_py", "esptool"))
|
|
import esptool
|
|
import espefuse
|
|
try:
|
|
import nvs_partition_gen as nvs_gen
|
|
except ImportError:
|
|
idf_path = os.getenv("IDF_PATH")
|
|
if not idf_path or not os.path.exists(idf_path):
|
|
raise Exception("IDF_PATH not found")
|
|
sys.path.insert(0, os.path.join(idf_path, "components", "nvs_flash", "nvs_partition_generator"))
|
|
import nvs_partition_gen as nvs_gen
|
|
|
|
|
|
esp_ds_data_dir = 'esp_ds_data'
|
|
# hmac_key_file is generated when HMAC_KEY is calculated, it is used when burning HMAC_KEY to efuse
|
|
hmac_key_file = esp_ds_data_dir + '/hmac_key.bin'
|
|
# csv and bin filenames are default filenames for nvs partition files created with this script
|
|
csv_filename = esp_ds_data_dir + '/pre_prov.csv'
|
|
bin_filename = esp_ds_data_dir + '/pre_prov.bin'
|
|
|
|
|
|
def load_privatekey(key_file_path, password=None):
|
|
key_file = open(key_file_path, 'rb')
|
|
key = key_file.read()
|
|
key_file.close()
|
|
return serialization.load_pem_private_key(key, password=password, backend=default_backend())
|
|
|
|
|
|
def number_as_bytes(number, pad_bits=None):
|
|
"""
|
|
Given a number, format as a little endian array of bytes
|
|
"""
|
|
result = int_to_bytes(number)[::-1]
|
|
while pad_bits is not None and len(result) < (pad_bits // 8):
|
|
result += b'\x00'
|
|
return result
|
|
|
|
|
|
def calculate_ds_parameters(privkey, priv_key_pass):
|
|
private_key = load_privatekey(privkey, priv_key_pass)
|
|
if not isinstance(private_key, rsa.RSAPrivateKey):
|
|
print("Only RSA private keys are supported")
|
|
sys.exit(-1)
|
|
|
|
priv_numbers = private_key.private_numbers()
|
|
pub_numbers = private_key.public_key().public_numbers()
|
|
Y = priv_numbers.d
|
|
M = pub_numbers.n
|
|
key_size = private_key.key_size
|
|
supported_key_size = [1024, 2048, 3072, 4096]
|
|
if key_size not in supported_key_size:
|
|
print("Key size not supported, supported sizes are" + str(supported_key_size))
|
|
sys.exit(-1)
|
|
|
|
hmac_key = os.urandom(32)
|
|
with open(hmac_key_file, 'wb') as key_file:
|
|
key_file.write(hmac_key)
|
|
|
|
iv = os.urandom(16)
|
|
|
|
rr = 1 << (key_size * 2)
|
|
rinv = rr % pub_numbers.n
|
|
mprime = - rsa._modinv(M, 1 << 32)
|
|
mprime &= 0xFFFFFFFF
|
|
length = key_size // 32 - 1
|
|
|
|
aes_key = hmac.HMAC(hmac_key, b"\xFF" * 32, hashlib.sha256).digest()
|
|
|
|
md_in = number_as_bytes(Y, 4096) + \
|
|
number_as_bytes(M, 4096) + \
|
|
number_as_bytes(rinv, 4096) + \
|
|
struct.pack("<II", mprime, length) + \
|
|
iv
|
|
assert len(md_in) == 12480 / 8
|
|
md = hashlib.sha256(md_in).digest()
|
|
|
|
# Y4096 || M4096 || Rb4096 || M_prime32 || LENGTH32 || MD256 || 0x08*8
|
|
p = number_as_bytes(Y, 4096) + \
|
|
number_as_bytes(M, 4096) + \
|
|
number_as_bytes(rinv, 4096) + \
|
|
md + \
|
|
struct.pack("<II", mprime, length) + \
|
|
b'\x08' * 8
|
|
|
|
assert len(p) == 12672 / 8
|
|
|
|
cipher = Cipher(algorithms.AES(aes_key), modes.CBC(iv), backend=default_backend())
|
|
encryptor = cipher.encryptor()
|
|
c = encryptor.update(p) + encryptor.finalize()
|
|
return c, iv, key_size
|
|
|
|
|
|
class DefineArgs(object):
|
|
def __init__(self, attributes):
|
|
for key, value in attributes.items():
|
|
self.__setattr__(key, value)
|
|
|
|
|
|
def efuse_summary(esp,args):
|
|
efuses, _efuse_operations = espefuse.get_efuses(esp, esp.CHIP_NAME, False, False, False)
|
|
|
|
summary_args = DefineArgs({
|
|
'baud': 115200,
|
|
'before': 'default_reset',
|
|
'chip': esp.CHIP_NAME,
|
|
'debug': False,
|
|
'do_not_confirm': False,
|
|
'file': sys.stdout,
|
|
'mode':'w',
|
|
'encding': 'utf-8',
|
|
'format': 'summary',
|
|
'operation': 'summary',
|
|
'port':args.port,
|
|
})
|
|
|
|
print("\n\n\n\t---SUMMARY START---\n")
|
|
espefuse.summary(esp, efuses, summary_args)
|
|
print("\n\t---SUMMARY END---\n\n")
|
|
|
|
|
|
def efuse_burn_key(esp, args):
|
|
|
|
efuses, efuse_operations = espefuse.get_efuses(esp, esp.CHIP_NAME, False, False, False)
|
|
|
|
if args.efuse_key_id is None:
|
|
print("efuse Key id cannot be None")
|
|
sys.exit(-1)
|
|
|
|
key_file = open(hmac_key_file, 'rb')
|
|
# First element of _KEYBLOCKS is config data so add offset of 1
|
|
key_block = efuses._KEYBLOCKS[args.efuse_key_id + 1][0]
|
|
burn_key_args = DefineArgs({
|
|
'baud': 115200,
|
|
'before': 'default_reset',
|
|
'chip': esp.CHIP_NAME,
|
|
'debug': False,
|
|
'do_not_confirm': False,
|
|
'block': [key_block],
|
|
'keyfile': [key_file],
|
|
'keypurpose': ['HMAC_DOWN_DIGITAL_SIGNATURE'],
|
|
'operation': 'burn_key',
|
|
'force_write_always': False,
|
|
'no_read_protect': True,
|
|
'no_write_protect': False,
|
|
'port': args.port,
|
|
|
|
})
|
|
|
|
try:
|
|
efuse_operations.burn_key(esp, efuses, burn_key_args, None)
|
|
key_file.close()
|
|
except esptool.FatalError:
|
|
print("\nERROR: The provided key block already contains previously burned key, please use a different key block ID")
|
|
sys.exit(-1)
|
|
|
|
|
|
def generate_csv_file(c, iv, hmac_key_id, key_size, csv_file):
|
|
|
|
with open(csv_file, 'wt', encoding='utf8') as f:
|
|
f.write("# This is a generated csv file containing required parameters for the Digital Signature operaiton\n")
|
|
f.write("key,type,encoding,value\nesp_ds_ns,namespace,,\n")
|
|
f.write("esp_ds_c,data,hex2bin,%s\n" % (c.hex()))
|
|
f.write("esp_ds_iv,data,hex2bin,%s\n" % (iv.hex()))
|
|
f.write("esp_ds_key_id,data,u8,%d\n" % (hmac_key_id))
|
|
f.write("esp_ds_rsa_len,data,u16,%d\n" % (key_size))
|
|
|
|
|
|
def generate_nvs_partition(input_filename, output_filename):
|
|
|
|
nvs_args = DefineArgs({
|
|
'input': input_filename,
|
|
'outdir': os.getcwd(),
|
|
'output': output_filename,
|
|
'size': hex(0x3000),
|
|
'version': 2,
|
|
'keyfile':None,
|
|
})
|
|
|
|
nvs_gen.generate(nvs_args, is_encr_enabled=False, encr_key=None)
|
|
|
|
|
|
def flash_nvs_partition(bin_path, addr, esp):
|
|
esp.connect()
|
|
print(bin_path)
|
|
abs_bin_path = os.path.dirname(os.path.abspath(__file__)) + '/' + bin_path
|
|
print(abs_bin_path)
|
|
if (os.path.exists(abs_bin_path) is False):
|
|
print("NVS partition not found")
|
|
sys.exit(-1)
|
|
|
|
with open(bin_path, 'rb') as nvs_file:
|
|
|
|
flash_file = [(addr, nvs_file)]
|
|
|
|
flash_args = DefineArgs({
|
|
'flash_size': '4MB',
|
|
'flash_mode': 'qio',
|
|
'flash_freq': '80m',
|
|
'addr_filename': flash_file,
|
|
'no_stub': False,
|
|
'compress': False,
|
|
'verify': False,
|
|
'encrypt': False,
|
|
'erase_all': False,
|
|
})
|
|
|
|
esp.change_baud(baud=921600)
|
|
esptool.write_flash(esp, flash_args)
|
|
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser(description='''Provision the ESPWROOM32SE device with
|
|
device_certificate and signer_certificate required for TLS authentication''')
|
|
|
|
parser.add_argument(
|
|
'--private-key',
|
|
dest='privkey',
|
|
default='main/client.key',
|
|
metavar='relative/path/to/client-priv-key',
|
|
help='relative path(from secure_cert_mfg.py) to signer certificate private key')
|
|
|
|
parser.add_argument(
|
|
"--pwd", '--password',
|
|
dest='priv_key_pass',
|
|
metavar='[password]',
|
|
help='the password associated with the private key')
|
|
|
|
parser.add_argument(
|
|
'--summary',
|
|
dest='summary',action='store_true',
|
|
help='Provide this option to print efuse summary the chip')
|
|
|
|
parser.add_argument(
|
|
'--efuse_key_id',
|
|
dest='efuse_key_id', type=int, choices=range(1,6),
|
|
metavar='[key_id] ',
|
|
default=1,
|
|
help='Provide the efuse key_id which contains/will contain HMAC_KEY, default is 1')
|
|
|
|
parser.add_argument(
|
|
"--port", '-p',
|
|
dest='port',
|
|
metavar='[port]',
|
|
required=True,
|
|
help='UART com port to which ESP device is connected')
|
|
|
|
parser.add_argument(
|
|
'--overwrite',
|
|
dest='overwrite', action='store_true',
|
|
help='Overwrite previously generated keys')
|
|
|
|
args = parser.parse_args()
|
|
|
|
esp = esptool.ESPLoader.detect_chip(args.port,baud=115200)
|
|
if (esp.CHIP_NAME != 'ESP32-S2'):
|
|
print("Only ESP32S2 chip is supported")
|
|
sys.exit(-1)
|
|
|
|
if args.summary is not False:
|
|
efuse_summary(esp, args)
|
|
sys.exit(0)
|
|
|
|
if (os.path.exists(esp_ds_data_dir) is False):
|
|
os.makedirs(esp_ds_data_dir)
|
|
else:
|
|
if (args.overwrite is False):
|
|
print("WARNING: previous ecrypted private key data exists.\nIf you want to overwrite,"
|
|
" please execute your command with providing \"--overwrite\" option")
|
|
sys.exit(0)
|
|
else:
|
|
print("overwriting previous encrypted private key data, as you have provided \"--overwrite\" option")
|
|
|
|
c, iv, key_size = calculate_ds_parameters(args.privkey, args.priv_key_pass)
|
|
efuse_burn_key(esp, args)
|
|
|
|
generate_csv_file(c, iv, args.efuse_key_id, key_size, csv_filename)
|
|
generate_nvs_partition(csv_filename, bin_filename)
|
|
flash_nvs_partition(bin_filename, 0x10000, esp)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|