.</i>
"sha1" or "sha512"); the <em>iterations</em> specifies the number of iterations
to use for the key derivation, and <em>length</em> indicates the number of
bytes to emit for the derived key.

<p>
<b>Note</b> that PBKDF2 <b>requires</b> that a salt be available, <i>e.g.</i>
via <a href="#SQLPasswordSaltFile"><code>SQLPasswordSaltFile</code></a> or
<a href="#SQLPasswordUserSalt"><code>SQLPasswordUserSalt</code></a>.

<p>
Per <a href="http://www.faqs.org/rfcs/rfc2898.html">RFC 2898</a>, the salt
used shou