---
title: "init(first:second:)"
framework: authenticationservices
role: symbol
role_heading: Initializer
path: "authenticationservices/asauthorizationpublickeycredentialprfregistrationoutput-swift.struct/init(first:second:)"
---

# init(first:second:)

Initializes an object representing the outputs of the web authentication PRF extension.

## Declaration

```swift
init(first: SymmetricKey, second: SymmetricKey?)
```

## Discussion

Discussion Call this method only if the registration request includes input values. Otherwise, use supported or unsupported.