[root@master-node encryption]# cat keygen.py

from cryptography.hazmat.primitives.asymmetric import rsa

from cryptography.hazmat.primitives import serialization

# Generate the RSA private key

key = rsa.generate_private_key(

public_exponent=65537,

key_size=2048,

)

pem = key.private_bytes(

encoding=serialization.Encoding.PEM,

format=serialization.PrivateFormat.TraditionalOpenSSL,

encryption_algorithm=serialization.NoEncryption()

)

print(pem)

public_key = key.public_key()

pem = public_key.public_bytes(

encoding=serialization.Encoding.PEM,

format=serialization.PublicFormat.SubjectPublicKeyInfo

)

print(pem)

===========================================

[root@master-node encryption]# cat encrypt.py

from cryptography.hazmat.primitives import hashes

from cryptography.hazmat.primitives.asymmetric import rsa, padding

from cryptography.hazmat.primitives.serialization import load_pem_public_key

import sys

public_pem_data=b’—–BEGIN PUBLIC KEY—–\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1ikdHKIUkRKKmxm5OMmH\nX8T2mx05ggDD7oEqZBd8×9lrzLOmADPoYT/qZGpFkXu6ys9IWlIqGp96qRsXQaRA\nO5EJziNdrCpMYGZFX5cxc8hnVh15h8DrvWj7pKoNmWkZhLiQ+vFsWLq3m41omQi/\ndhNMybPLsLGqS7EOO17z1VifSp33XOXLNZkrU3otItoqPPNq6nAXuINXZsPTdRY7\nk/ERmEXU2l6+GMKWnesRWm7txJSTgdpH8hjfoSZmJTHy7+uZqTdHC3PpCojZeIRw\ndgOEErYnKEHMQ6/4DV0a0tF5BzwXhrolSYkWmpt65pblbLQAzgR0KA91F8iJHp5Y\ncQIDAQAB\n—–END PUBLIC KEY—–\n’

key = load_pem_public_key(public_pem_data)

fi.open(sys.argv[1],’rb’)

message = fi.read()

fi.close()

ciphertext = key.encrypt(

message,

padding.OAEP(

mgf=padding.MGF1(algorithm=hashes.SHA256()),

algorithm=hashes.SHA256(),

label=None

)

)

fo=open(sys.argv[2],’wb’)

f.write(ciphertext)

f.close()

===========================================

[root@master-node encryption]# cat decrypt.py

from cryptography.hazmat.primitives.serialization import load_pem_private_key

from cryptography.hazmat.primitives import hashes

from cryptography.hazmat.primitives.asymmetric import rsa, padding

pem_data=b’—–BEGIN RSA PRIVATE KEY—–\nMIIEogIAdf8a1kupHcqgVHzcBlgBfRDBr\nEQyKr9JWXzLTwgbpft/7qvOkv4T0pOzhWBvKJaKvm1sY+4l+Z1g=\n—–END RSA PRIVATE KEY—–\n’