---
title: kSecOIDX509V3CertificateExtensionId
framework: security
role: symbol
role_heading: Global Variable
path: security/ksecoidx509v3certificateextensionid
---

# kSecOIDX509V3CertificateExtensionId

## Declaration

```swift
let kSecOIDX509V3CertificateExtensionId: CFString
```