09.txt">RFC 2104</A>, and CMACs,
specified in <A HREF="http://www.ietf.org/rfc/rfc4493.txt">RFC 4493</A>
and NIST document 800-38B.</P><H3>HMACs</H3><P>Instances of HMACs are constructed by specifying a secret key and a
digest-name.</P><DIV CLASS="lisp-symbol"><A NAME="make-hmac"></A><TT><STRONG>make-hmac</STRONG> <EM>key</EM> <EM>digest-name</EM> =&gt; <EM>hmac</EM></TT><BR /></DIV><P>Return an HMAC instance based on the hash function <EM>digest-name</EM> with secret key <EM>key</EM>.</P><P>The returned ob