code: def encrypt(self, key_password):
          
          if not self.is_decrypted():
              return
  
          encrypted_private_key = sun_crypto.jks_pkey_encrypt(self.pkey_pkcs8, key_password)
  
          a = AlgorithmIdentifier()
          a.setComponentByName('algorithm', sun_crypto.SUN_JKS_ALGO_ID)
          a.setComponentByName('parameters', '\x05\x00')
          epki = rfc5208.EncryptedPrivateKeyInfo()
          epki.setComponentByName('encryptionAlgorithm',a)
          epki.setComponentByName('encryptedData', encrypted_private_key)
  
          self._encrypted = encoder.encode(epki)
          self._pkey = None
          self._pkey_pkcs8 = None
          self._algorithm_oid = None
docs: Encrypts the private key, so that it can be saved to a keystore.
  
          This will make it necessary to decrypt it again if it is going to be used later.
          Has no effect if the entry is already encrypted.
  
          :param str key_password: The password to encrypt the entry with.