gistfile1.txt

from Crypto.PublicKey import RSA
from Crypto import Random
from Crypto.Cipher import PKCS1_OAEP
from Crypto.Signature import PKCS1_v1_5 
from Crypto.Hash import SHA256
from base64 import b64encode

random_generator = Random.new().read
key = RSA.generate(1024, random_generator)

plaintext = "Hello".encode("UTF8")
print("Plaintext Message:")
print(plaintext)

cipher = PKCS1_OAEP.new(key)
ciphertext = cipher.encrypt(plaintext)
print("\nCiphertext Message:")
print(b64encode(ciphertext))

digest = SHA256.new(ciphertext)

signer = PKCS1_v1_5.new(key)
signature = signer.sign(digest)
print("\nSignature:")
print(b64encode(signature))

print("\nSignature Verified?")
print(signer.verify(digest, signature))