1  import board
 2  import busio
 3  from adafruit_atecc.adafruit_atecc import ATECC, _WAKE_CLK_FREQ, CFG_TLS
 4  
 5  import adafruit_atecc.adafruit_atecc_cert_util as cert_utils
 6  
 7  # -- Enter your configuration below -- #
 8  
 9  # Lock the ATECC module when the code is run?
10  LOCK_ATECC = False
11  # 2-letter country code
12  MY_COUNTRY = "US"
13  # State or Province Name
14  MY_STATE = "New York"
15  # City Name
16  MY_CITY = "New York"
17  # Organization Name
18  MY_ORG = "Adafruit"
19  # Organizational Unit Name
20  MY_SECTION = "Crypto"
21  # Which ATECC slot (0-4) to use
22  ATECC_SLOT = 0
23  # Generate new private key, or use existing key
24  GENERATE_PRIVATE_KEY = True
25  
26  # -- END Configuration, code below -- #
27  
28  # Initialize the i2c bus
29  i2c = busio.I2C(board.SCL, board.SDA, frequency=_WAKE_CLK_FREQ)
30  
31  # Initialize a new atecc object
32  atecc = ATECC(i2c)
33  
34  print("ATECC Serial Number: ", atecc.serial_number)
35  
36  if not atecc.locked:
37      if not LOCK_ATECC:
38          raise RuntimeError(
39              "The ATECC is not locked, set LOCK_ATECC to True in code.py."
40          )
41      print("Writing default configuration to the device...")
42      atecc.write_config(CFG_TLS)
43      print("Wrote configuration, locking ATECC module...")
44      # Lock ATECC config, data, and otp zones
45      atecc.lock_all_zones()
46      print("ATECC locked!")
47  
48  print("Generating Certificate Signing Request...")
49  # Initialize a certificate signing request with provided info
50  csr = cert_utils.CSR(
51      atecc,
52      ATECC_SLOT,
53      GENERATE_PRIVATE_KEY,
54      MY_COUNTRY,
55      MY_STATE,
56      MY_CITY,
57      MY_ORG,
58      MY_SECTION,
59  )
60  # Generate CSR
61  my_csr = csr.generate_csr()
62  print("-----BEGIN CERTIFICATE REQUEST-----\n")
63  print(my_csr.decode("utf-8"))
64  print("-----END CERTIFICATE REQUEST-----")