> ## Documentation Index
> Fetch the complete documentation index at: https://notevil.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# CAPLfunctionSecurityLocalGenerateCMAC

# SecurityLocalGenerateCMAC

[Valid for](../../../Shared/FeatureAvailability.md): CANoe DE • CANoe4SW DE

**Note**\
Replaces `LocalSecurityGenerateCMAC`.

## Function Syntax

```
long SecurityLocalGenerateCMAC(byte key[], dword keyLength, byte data[], dword dataLength, byte cmac[], dword cmacLength)
```

## Description

Generates a hash for the given data and key. The generated hash is a CMAC.

## Parameters

* **byte key\[]**: The key to be used.
* **dword keyLength**: 16 or 32 (bytes).
* **byte data\[]**: The data for which the CMAC should be computed.
* **dword dataLength**: The length of the data for which the CMAC should be computed.
* **byte cmac\[] \[Out]**: The generated CMAC.
* **dword cmacLength \[In/Out]**: The length of the generated CMAC (16 bytes).

## Return Values

* **1**: Success\
  A Value of 1 means that the action was successful.
* **≤ 0**: Error\
  A value less than or equal to 0 means error.

## Example

**Example**

```plaintext theme={null}
byte keyData[16] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c};
dword keyLength = elcount(keyData);
byte data[16] = {0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a};
dword dataLength = elcount(data);
byte cmac[16];
dword cmacLength = elcount(cmac);

long result;

result = SecurityLocalGenerateCMAC(keyData, keyLength, data, dataLength, cmac, cmacLength);
```