---
title: clientDataHash
framework: authenticationservices
role: symbol
role_heading: Instance Property
path: authenticationservices/aspasskeycredentialrequest/clientdatahash
---

# clientDataHash

The hash of the client data for this assertion.

## Declaration

```swift
var clientDataHash: Data { get }
```

## Discussion

Discussion Use the client data hash for both registration and assertion challenges.

## See Also

### Viewing passkey challenge information

- [userVerificationPreference](authenticationservices/aspasskeycredentialrequest/userverificationpreference.md)
- [supportedAlgorithms](authenticationservices/aspasskeycredentialrequest/supportedalgorithms-74mad.md)
- [extensionInput](authenticationservices/aspasskeycredentialrequest/extensioninput.md)
- [ASPasskeyCredentialExtensionInput](authenticationservices/aspasskeycredentialextensioninput.md)