---
title: SecExternalFormat.formatOpenSSL
framework: security
role: symbol
role_heading: Case
path: security/secexternalformat/formatopenssl
---

# SecExternalFormat.formatOpenSSL

Format for asymmetric (public/private) keys. OpenSSL is an open source toolkit for Secure Sockets Layer (SSL) and Transport Layer Security (TLS). Also known as X.509 for public keys.

## Declaration

```swift
case formatOpenSSL
```