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Please Note:

Bulk Operations in HMAC

The bulk operation in HMAC is supported only with HmacSHA256. To perform the bulk operation follow the steps below:

Create an instance of HmacSHA256

HmacSHA256 hmc = new HmacSHA256( hkey );

Call doFinalBulk method and pass the array of data to be encrypted.
```
byte[][] macValue = hmc.doFinalBulk( dataToEncrypt);
```