---
title: kSecPolicyKU_DigitalSignature
framework: security
role: symbol
role_heading: Global Variable
path: security/ksecpolicyku_digitalsignature
---

# kSecPolicyKU_DigitalSignature

If true, the certificate’s key usage must allow it to be used for signing.

## Declaration

```swift
let kSecPolicyKU_DigitalSignature: CFString
```