decrypt RSA (PKCS1 OAEP)

decrypt_RSA.py

# -*- coding : utf-8 -*-

def decrypt_RSA(private_key_loc, package):
    from Crypto.PublicKey import RSA
    from Crypto.Cipher import PKCS1_OAEP
    from base64 import b64decode
    key = open(private_key_loc, "r").read()
    rsakey = RSA.importKey(key)
    rsakey = PKCS1_OAEP.new(rsakey)
    decrypted = rsakey.decrypt(b64decode(package))
    return decrypted

package = open('flag.enc', "r").read()
message = decrypt_RSA('private87.key', package)

print (message)