---
title: prf
framework: authenticationservices
role: symbol
role_heading: Instance Property
path: authenticationservices/aspasskeyassertioncredentialextensioninput-swift.struct/prf
---

# prf

Input for the WebAuthn PRF extension in passkey assertion requests.

## Declaration

```swift
var prf: ASAuthorizationPublicKeyCredentialPRFAssertionInput? { get }
```

## See Also

### Using inputs

- [largeBlob](authenticationservices/aspasskeyassertioncredentialextensioninput-swift.struct/largeblob.md)