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# ASAuthorizationPlatformPublicKeyCredentialAssertionRequest

The concrete assertion request type for platform credentials.

```
class ASAuthorizationPlatformPublicKeyCredentialAssertionRequest
```

## Overview

Use this class to sign in with an existing credential that the system stores in iCloud Keychain.

## Topics

### Accessing request properties

[`allowedCredentials`](/documentation/AuthenticationServices/ASAuthorizationPlatformPublicKeyCredentialAssertionRequest/allowedCredentials)

The array of allowed credentials.

[`largeBlob`](/documentation/AuthenticationServices/ASAuthorizationPlatformPublicKeyCredentialAssertionRequest/largeBlob-9kvvl)

The request’s binary large object value.

[`largeBlob`](/documentation/AuthenticationServices/ASAuthorizationPlatformPublicKeyCredentialAssertionRequest/largeBlob-5mg1q)

The request’s binary large object value.

[`prf`](/documentation/AuthenticationServices/ASAuthorizationPlatformPublicKeyCredentialAssertionRequest/prf-47uoa)

[`ASAuthorizationPublicKeyCredentialPRFAssertionInput`](/documentation/AuthenticationServices/ASAuthorizationPublicKeyCredentialPRFAssertionInput-c.class)

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


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