Decryptor.py

from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding


with open('E:\\Assignment\\Message.encrypted', 'rb') as f:
    encrypted = f.read()

with open("E:\\Assignment\\private_key.pem", "rb") as key_file:
    private_key = serialization.load_pem_private_key(
        key_file.read(),
        password=None,
        backend=default_backend()
    )

original_message = private_key.decrypt(
    encrypted,
    padding.OAEP(
        mgf=padding.MGF1(algorithm=hashes.SHA256()),
        algorithm=hashes.SHA256(),
        label=None
    )
)

print(original_message)

with open('E:\\Assignment\\Messagedecrypted.txt', 'wb') as f:
    f.write(original_message)