1  # Copyright 2019 Google Inc.
 2  #
 3  # Modified by Brent Rubell for Adafruit Industries, 2019
 4  # Licensed under the Apache License, Version 2.0 (the "License");
 5  # you may not use this file except in compliance with the License.
 6  # You may obtain a copy of the License at
 7  #
 8  #         http://www.apache.org/licenses/LICENSE-2.0
 9  #
10  # Unless required by applicable law or agreed to in writing, software
11  # distributed under the License is distributed on an "AS IS" BASIS,
12  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  # See the License for the specific language governing permissions and
14  # limitations under the License.
15  #
16  # Copyright 2019 Google Inc.
17  #
18  # Licensed under the Apache License, Version 2.0 (the "License");
19  # you may not use this file except in compliance with the License.
20  # You may obtain a copy of the License at
21  #
22  #         http://www.apache.org/licenses/LICENSE-2.0
23  #
24  # Unless required by applicable law or agreed to in writing, software
25  # distributed under the License is distributed on an "AS IS" BASIS,
26  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
27  # See the License for the specific language governing permissions and
28  # limitations under the License.
29  #
30  """
31  `decode_priv_key.py`
32  ===================================================================
33  
34  Generates RSA keys and decodes them using python-rsa
35  for use with a CircuitPython secrets file.
36  
37  This script is designed to run on a computer,
38  NOT a CircuitPython device.
39  
40  Requires Python-RSA (https://github.com/sybrenstuvel/python-rsa)
41  
42  * Author(s): Google Inc., Brent Rubell
43  """
44  import subprocess
45  import rsa
46  
47  # Generate private and public RSA keys
48  proc = subprocess.Popen(["openssl", "genrsa", "-out", "rsa_private.pem", "2048"])
49  proc.wait()
50  proc = subprocess.Popen(
51      ["openssl", "rsa", "-in", "rsa_private.pem", "-pubout", "-out", "rsa_public.pem"]
52  )
53  proc.wait()
54  
55  # Open generated private key file
56  try:
57      with open("rsa_private.pem", "rb") as file:
58          private_key = file.read()
59  except:
60      print("No file named rsa_private.pem found in directory.")
61  pk = rsa.PrivateKey.load_pkcs1(private_key)
62  
63  print("Copy and paste this into your secrets.py file:\n")
64  print('"private_key": ' + str(pk)[10:] + ",")