Simple example of generating private_key/hostname for tor hidden services.

tor_hs_keygen.py

'''
Based on https://gist.github.com/DonnchaC/d6428881f451097f329e, including
a very helpful comment attached to that gist.
'''

import base64
import hashlib
import os

from Crypto.PublicKey import RSA


def generate_tor_service_keys(directory='.', bytes=2048):
    '''
    Generate a private key and derived .onion address in the given
    `directory` with names corresponding to the ones tor generates for hidden
    services.
    '''
    key_output_path = os.path.join(directory, 'private_key')
    hostname_output_path = os.path.join(directory, 'hostname')

    key = RSA.generate(bytes)

    with open(key_output_path, 'w') as f:
        f.write(key.exportKey('PEM'))

    onion_address = hashlib.sha1(key.publickey().exportKey('DER')[22:]).digest()[:10]
    onion_address = base64.b32encode(onion_address).decode('utf-8').lower()
    onion_address = '{}.onion'.format(onion_address)

    with open(hostname_output_path, 'w') as f:
        f.write(onion_address)