---
title: kSecAttrPRFHmacAlgSHA1
framework: security
role: symbol
role_heading: Global Variable
path: security/ksecattrprfhmacalgsha1
---

# kSecAttrPRFHmacAlgSHA1

Use the SHA1 algorithm.

## Declaration

```swift
let kSecAttrPRFHmacAlgSHA1: CFString
```