---
title: "signature(for:using:)"
framework: passkit
role: symbol
role_heading: Instance Method
path: "passkit/jpkipasscontents/identity/signature(for:using:)-35arv"
---

# signature(for:using:)

Signs the supplied array of data with the identity’s private key

## Declaration

```swift
func signature(for data: [Data], using request: JPKIPassContents.AuthenticationRequest<Self.IdentityType>) async throws -> [JPKIPassContents.Signature<Self.IdentityType>]
```

## Discussion

Discussion Properties: data: Data array to be signed with the specified identity authentication: User authentication request to perform identity signature with note: See Error type defined below