<!--
{
  "availability" : [
    "iOS: 15.0.0 -",
    "iPadOS: 15.0.0 -",
    "macCatalyst: 15.0.0 -",
    "macOS: 12.0.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AuthenticationServices",
  "identifier" : "/documentation/AuthenticationServices/ASCOSEAlgorithmIdentifier",
  "metadataVersion" : "0.1.0",
  "role" : "Structure",
  "symbol" : {
    "kind" : "Structure",
    "modules" : [
      "Authentication Services"
    ],
    "preciseIdentifier" : "c:@T@ASCOSEAlgorithmIdentifier"
  },
  "title" : "ASCOSEAlgorithmIdentifier"
}
-->

# ASCOSEAlgorithmIdentifier

An identifier for the algorithm that a credential’s key pair uses.

```
struct ASCOSEAlgorithmIdentifier
```

## Topics

### Creating the identifier

[`init(_:)`](/documentation/AuthenticationServices/ASCOSEAlgorithmIdentifier/init(_:))

Creates the algorithm identifier.

[`init(rawValue:)`](/documentation/AuthenticationServices/ASCOSEAlgorithmIdentifier/init(rawValue:))

Creates the algorithm identifier.

[`ES256`](/documentation/AuthenticationServices/ASCOSEAlgorithmIdentifier/ES256)

The ES256 algorithm.


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)