decrypt.py

from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
from Crypto.Hash import SHA
from base64 import b64decode
import requests

key = 'need-to-populate'
rsa_key = RSA.importKey(key)
verifier = PKCS1_v1_5.new(rsa_key)
raw_cipher_data = b64decode(f.open('foo.txt.enc'))
foo = rsa_key.decrypt(raw_cipher_data)

// POST to  API service
r = requests.post('', data = {'file':'foo.txt'})