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# ASAuthorizationPlatformPublicKeyCredentialProvider

A mechanism for providing public key credential requests to an app or service with iCloud Keychain.

```
class ASAuthorizationPlatformPublicKeyCredentialProvider
```

## Overview

The credential provider accesses public-private key pairs stored in iCloud Keychain for registration or authentication with a relying party. Instantiate this object, passing in the relying party identifier for the credentials.

## Topics

### Creating the provider

[`init(relyingPartyIdentifier:)`](/documentation/AuthenticationServices/ASAuthorizationPlatformPublicKeyCredentialProvider/init(relyingPartyIdentifier:))

Creates the object with a relying party identifier.

### Creating the request

[`relyingPartyIdentifier`](/documentation/AuthenticationServices/ASAuthorizationPlatformPublicKeyCredentialProvider/relyingPartyIdentifier)

The domain name of the service to register or authorize against.

[`createCredentialAssertionRequest(challenge:)`](/documentation/AuthenticationServices/ASAuthorizationPlatformPublicKeyCredentialProvider/createCredentialAssertionRequest(challenge:))

Creates an assertion request with a challenge.

[`createCredentialRegistrationRequest(challenge:name:userID:)`](/documentation/AuthenticationServices/ASAuthorizationPlatformPublicKeyCredentialProvider/createCredentialRegistrationRequest(challenge:name:userID:))

Creates a registration request with a challenge, name, and user ID.

[`createCredentialRegistrationRequest(challenge:name:userID:requestStyle:)`](/documentation/AuthenticationServices/ASAuthorizationPlatformPublicKeyCredentialProvider/createCredentialRegistrationRequest(challenge:name:userID:requestStyle:))


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