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# ASAuthorizationPublicKeyCredentialPRFAssertionInput

A type that represents input for the web authentication PRF extension in passkey assertion requests.

```
struct ASAuthorizationPublicKeyCredentialPRFAssertionInput
```

## Overview

The PRF extension lets you create general purpose `SymmetricKey` keys from passkeys, which can be useful for tasks like encryption of user data. Using the same input values with the same passkey produces the same `SymmetricKey`.

## Topics

### Accessing input values

[`inputValues`](/documentation/AuthenticationServices/ASAuthorizationPublicKeyCredentialPRFAssertionInput-swift.struct/inputValues-swift.property)

The input values to use when generating the PRF extension output, if specified.

[`inputValues(_:perCredentialInputValues:)`](/documentation/AuthenticationServices/ASAuthorizationPublicKeyCredentialPRFAssertionInput-swift.struct/inputValues(_:perCredentialInputValues:))

The inputs for the PRF extension.

### Accessing per-credential input values

[`perCredentialInputValues`](/documentation/AuthenticationServices/ASAuthorizationPublicKeyCredentialPRFAssertionInput-swift.struct/perCredentialInputValues)

A map of credential identifiers to input values for the PRF extension.

[`perCredentialInputValues(_:)`](/documentation/AuthenticationServices/ASAuthorizationPublicKeyCredentialPRFAssertionInput-swift.struct/perCredentialInputValues(_:))

The inputs for the PRF extension, when not specifying general input values.

### Supporting types

[`ASAuthorizationPublicKeyCredentialPRFAssertionInput.InputValues`](/documentation/AuthenticationServices/ASAuthorizationPublicKeyCredentialPRFAssertionInput-swift.struct/InputValues-swift.struct)

The values to use as inputs to the salts for deriving the symmetric key.


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