code: def encrypt(self):
          
          value = self.parameters.get("Plaintext")
          if isinstance(value, six.text_type):
              value = value.encode('utf-8')
          return json.dumps({"CiphertextBlob": base64.b64encode(value).decode("utf-8"), 'KeyId': 'key_id'})
docs: We perform no encryption, we just encode the value as base64 and then
          decode it in decrypt().