RightNow\Connect\Crypto\v1_3\MessageDigest in customer portal

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Hi,

I tried to call the below code from my model.php file:

use RightNow\Connect\Crypto\v1_3 as Crypto;

$md = new Crypto\MessageDigest();

But i am getting an error message:

<b>Fatal error</b>:  Class 'RightNow\Connect\Crypto\v1_3\MessageDigest' not found in <b>/model.php

Can anyone help me, why this error is coming? Can't we use it in customer portal?