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csr-gen.py
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#!/bin/python
# HTT Consulting, LLC
# Robert Moskowitz
# 2024-09-17
# developed with Fedora 38 using
# dnf install python3-pycryptodomex
# https://pycryptodome.readthedocs.io/en/v3.15.0/src/introduction.html
# I don't know if the following is still needed...
# dnf install python3-IPy
__version__ = '2024.09.17'
import sys, getopt
import ipaddress
from binascii import *
import base64
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import ed25519
from cryptography.hazmat.primitives.serialization import load_pem_private_key
from cryptography import x509
from cryptography.x509.oid import NameOID
from Cryptodome.Hash import cSHAKE128
def det_orchid(raa, hda, hi):
# set some defaults
# ORCHID PREFIX = 2001:30/28 = b0010 0000 0000 0001:0000 0000 0011/28
# HID = RAA (always 14 bits) + HDA (always 14 bits) = 10 + 20 = b00 0000 0000 1010 + b00 0000 0000 0001 0100
b_prefix = '0010000000000001000000000011' # RFC 9374 Section 8.2.1
# h_prefix = '2001003'
b_ogaid = '00000101' # suiteid of 5, RFC 9374 Section 8.2.2
ContextID = unhexlify("00B5A69C795DF5D5F0087F56843F2C40")
#format the HID from raa and HDA
print("raa:", raa)
# print("RAA:", f'{raa:014b}')
print("hda:", hda)
# print("HDA:", f'{hda:014b}')
b_hid = f'{raa:014b}' + f'{hda:014b}'
# print("HID:", b_hid)
# perform hash with cSHAKE using input data
h_orchid_left = unhexlify(b_prefix + b_hid + b_ogaid)
# print(h_orchid_left.hex())
shake = cSHAKE128.new(custom = ContextID)
# print(type(h_orchid_left))
# print("HI:", type(hi), hi)
print("HI:", hi)
shake.update((h_orchid_left + hi))
h_hash = shake.read(8).hex()
# format orchid in binary
h_orchid = hex(int(b_prefix + b_hid + b_ogaid, 2))[2:] + h_hash
orchid = 2
print("DET:", h_orchid)
# add in ':' for IPv6
hiprr = base64.b64encode(hi).decode('ascii')
# print("HIP RR: IN HIP ( 5 ", h_orchid, "\n ", hiprr, ")")
#, hiprr[52:].zfill(52), ")")
str_orchid = ':'.join(h_orchid[i:i+4] for i in range(0, len(h_orchid), 4))
print("DET:", str_orchid)
return h_orchid
print("CSR Gen Version: ", __version__)
# set some defaults
keyname = 'keyfile'
passwd = ''
suiteid = 5
raa = 0 # e.g. 16376
hda = 0 # e.g. 20
det = "none"
serialnumber = "none"
ccaid = "none"
createkeyname = True
# handle cmdline args
try:
opts, args = getopt.getopt(sys.argv[1:],"hn:p:c:",["serialnumber=","keyname=","passwd=","raa=","hda=", "keynameexists="])
except getopt.GetoptError:
print('Error')
sys.ext(2)
# parse the args
for opt, arg in opts:
if opt == '-h':
print('det-gen.py [-s, --serialnumber] <serialnumber> [-n,--keyname] <keyname> [-p,--passwd] <password> [--raa <RAA:10>] [--hda <HDA:20>] --keynameexists <y/n>]')
sys.exit()
elif opt in ("-s", "--serialnumber"):
serialnumber = arg
elif opt in ("-n", "--keyname"):
keyname = arg
elif opt in ("-p", "--passwd"):
passwd = arg
elif opt == '--raa':
raa = int(arg)
elif opt == '--hda':
hda = int(arg)
elif opt == '--keynameexists':
if arg == 'n' or arg == 'N':
createkeyname = True
# print("No")
else:
createkeyname = False
# print("yes")
if serialnumber == "none":
print("Error - No Serial Number")
sys.ext(2)
# Not really using keyfile password :(
if createkeyname:
# Generate our key
private_key = ed25519.Ed25519PrivateKey.generate()
public_key = private_key.public_key()
public_bytes = public_key.public_bytes(
encoding=serialization.Encoding.Raw,
format=serialization.PublicFormat.Raw)
# Write our key to disk for safe keeping
with open(keyname + "prv.pem", "wb") as f:
f.write(private_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption(),
))
f.close()
else:
with open(keyname + "prv.pem", "rb") as f:
keyname_pkkey = f.read()
f.close()
private_key = load_pem_private_key(keyname_pkkey, None)
public_key = private_key.public_key()
public_bytes = public_key.public_bytes(
encoding=serialization.Encoding.Raw,
format=serialization.PublicFormat.Raw)
if raa == 0:
print("No RAA provided. A DET will not be generated")
det = 0
det_int = 0
csr = x509.CertificateSigningRequestBuilder().subject_name(x509.Name([
# Provide various details about who we are.
x509.NameAttribute(NameOID.SERIAL_NUMBER, serialnumber),
# x509.NameAttribute(NameOID.COMMON_NAME, ccaid),
])
# Sign the CSR with our private key.
).sign(private_key, None)
else:
# print("RAA: ", raa)
# print("HDA: ", hda)
hi = public_bytes.hex()
det = det_orchid(raa, hda, bytes(hi, 'utf-8'))
det_int = int(bytes(det, 'utf-8'),16)
#print("here", type(det), det)
#print("here2", type(det_int), det_int)
csr = x509.CertificateSigningRequestBuilder().subject_name(x509.Name([
# Provide various details about who we are.
x509.NameAttribute(NameOID.SERIAL_NUMBER, serialnumber),
# x509.NameAttribute(NameOID.COMMON_NAME, ccaid),
])
).add_extension(x509.SubjectAlternativeName([x509.IPAddress(ipaddress.IPv6Address(det_int))]),critical=True,
# Sign the CSR with our private key.
).sign(private_key, None)
# Write our CSR out to disk.
with open(keyname + "csr.pem", "wb") as f:
f.write(csr.public_bytes(serialization.Encoding.PEM))
f.close()