EM> =&gt; <EM>cmac</EM></TT><BR /></DIV><P>Return a CMAC instance based on the cipher <EM>cipher-name</EM> with
secret key <EM>key</EM>.  <EM>cipher-name</EM> must have a <A HREF="#block-length" STYLE="symbol">block-length</A>
of either 8 or 16; this restriction is satisfied by most ciphers in
Ironclad with the notable exception of stream ciphers.  <EM>key</EM> must
be an acceptable key for <EM>cipher-name</EM>.</P><DIV CLASS="lisp-symbol"><A NAME="update-cmac"></A><TT><STRONG>update-cmac</STRONG> <EM>cmac<