How can I encrypt with a RSA private key in python?

Question

Is it possible to encrypt a message with a private key in python using pycryptodome or any other library? I know that you are not supposed to encrypt with the private key an

Answer 1

Looks like pycrypto has not been under active development since 2014 and support ended at python 3.3. cryptography seems like the standard now.

Using cryptography:

from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.backends import default_backend

password = b'thepassword'

key = rsa.generate_private_key(
    backend=default_backend(),
    public_exponent=65537,
    key_size=2048
)

private_key = key.private_bytes(
    serialization.Encoding.PEM,
    serialization.PrivateFormat.PKCS8,
    serialization.BestAvailableEncryption(password)
)

public_key = key.public_key().public_bytes(
    serialization.Encoding.OpenSSH,
    serialization.PublicFormat.OpenSSH
)