---
title: cla
framework: cryptotokenkit
role: symbol
role_heading: Instance Property
path: cryptotokenkit/tksmartcard/cla
---

# cla

The CLA byte used for APDU transmission. 0x00 by default.

## Declaration

```swift
var cla: UInt8 { get set }
```

## See Also

### Configuring APDU Behavior

- [useExtendedLength](cryptotokenkit/tksmartcard/useextendedlength.md)
- [useCommandChaining](cryptotokenkit/tksmartcard/usecommandchaining.md)