n ranges is valid, although in bit terms that only happens
in 8-bit increments.</p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Even though CAST5 supports key lengths lower than 128 bits
(16 bytes), in fact they will just be zero-padded to the
maximum length, as specified in <a class="reference external" href="http://tools.ietf.org/rfc/rfc2144.txt">RFC 2144</a>.</p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="l