decrypt.py

from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_v1_5 as Cipher_PKCS1_v1_5
from base64 import b64decode
# uses pycryptodome (3.7.2)

file_in =  open('private.pem','rb').read()
key = RSA.import_key(file_in) # import the public key
# we make our cipher
cipher = Cipher_PKCS1_v1_5.new(key)



msg = open('message.txt', 'rb').read()
decrypt_text = cipher.decrypt(b64decode(msg), None).decode()
print("here's our message:", decrypt_text)

encrypt.py

from Crypto.PublicKey import RSA
import urllib.parse

# uses pycryptodome (3.7.2)

# We make the key and save the private key somewhere super safe.
key = RSA.generate(2048)
print("Dumping PEM file to private.pem.")
f = open('private.pem','wb')
f.write(key.export_key('PEM'))
f.close

# This is where users need to go to approve the app and get their base64 encoded 
# token info
public_key = urllib.parse.quote_plus(key.publickey().exportKey().decode('utf-8'))
url = 'https://stage.neurostars.org/user-api-key/new?scopes=write&application_name=HelpMe&public_key={0}&client_id=helpme-alpha&nonce=666401a65ea121858be20f0925524453'.format(public_key.replace("'", ""))

print(url)
print("Please go to the above URL, Enter/Paste your key. Ctrl-D  to save it.")
contents = []
while True:
    try:
        line = input()
    except EOFError:
        break
    contents.append(line)

msg = '\n'.join(contents)

print("Dumping our payload to message.txt")
f = open('message.txt','w')
f.write(msg)
f.close