_MAC_PARAM_TLS_DATA_SIZE</b>) &lt;unsigned integer&gt;</dt>
<dd>

<p>This parameter is only supported by HMAC. If set then special handling is activated for calculating the MAC of a received mac-then-encrypt TLS record where variable length record padding has been used (as in the case of CBC mode ciphersuites). The value represents the total length of the record that is having the MAC calculated including the received MAC and the record padding.</p>

<p>When used EVP_MAC_update must be called precisely twic