code: def encrypt(self, text, recv_key='', template='', key_type=''):
          
          if not key_type:
              key_type = self.encrypt_key_type
          if not template:
              template = self.template
  
          return self.crypto.encrypt(text, recv_key, template, key_type)
docs: xmlsec encrypt --pubkey-pem pub-userkey.pem
              --session-key aes128-cbc --xml-data doc-plain.xml
              --output doc-encrypted.xml session-key-template.xml
  
          :param text: Text to encrypt
          :param recv_key: A file containing the receivers public key
          :param template: A file containing the XMLSEC template
          :param key_type: The type of session key to use
          :result: An encrypted XML text