diff --git a/src/fido.rs b/src/fido.rs
index 9916f18..c5473fd 100644
--- a/src/fido.rs
+++ b/src/fido.rs
@@ -54,6 +54,8 @@ pub struct U2fRegistrationData {
     pub app_id: String,
     pub device_info: U2FDeviceInfo,
     pub device_name: Option<String>,
+    pub client_data: String,
+    pub registration_data: String,
     pub attestation_cert_pem: Option<String>,
     pub pub_key: String,
     pub key_handle: String,
@@ -69,6 +71,8 @@ impl U2fRegistrationData {
             app_id: app_id.to_string(),
             device_info: U2FDeviceInfo::from(&register_result),
             device_name: rr.device_name,
+            client_data: client_data.into(),
+            registration_data: base64::encode(&register_result.0),
             attestation_cert_pem: rr.attestation_cert.map(|c| {
                 to_pem(&c, "CERTIFICATE", 64)
             }),