---
title: SecExternalFormat.formatUnknown
framework: security
role: symbol
role_heading: Case
path: security/secexternalformat/formatunknown
---

# SecExternalFormat.formatUnknown

## Declaration

```swift
case formatUnknown
```

## Discussion

Discussion When importing, indicates the format is unknown. When exporting, use the default format for the item. For asymmetric keys, the default is kSecFormatOpenSSL. For symmetric keys, the default is kSecFormatRawKey. For certificates, the default is kSecFormatX509Cert. For multiple items, the default is kSecFormatPEMSequence.