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<HTML>
<HEAD>
<TITLE>Digest::HMAC - Keyed-Hashing for Message Authentication</TITLE>
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<LINK REV="made" HREF="mailto:">
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<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> Digest::HMAC - Keyed-Hashing for Message Authentication</P></STRONG>
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<A NAME="__index__"></A>
<!-- INDEX BEGIN -->
<UL>
<LI><A HREF="#name">NAME</A></LI><LI><A HREF="#supportedplatforms">SUPPORTED PLATFORMS</A></LI>
<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
<LI><A HREF="#description">DESCRIPTION</A></LI>
<LI><A HREF="#see also">SEE ALSO</A></LI>
<LI><A HREF="#authors">AUTHORS</A></LI>
</UL>
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<P>
<H1><A NAME="name">NAME</A></H1>
<P>Digest::HMAC - Keyed-Hashing for Message Authentication</P>
<P>
<HR>
<H1><A NAME="supportedplatforms">SUPPORTED PLATFORMS</A></H1>
<UL>
<LI>Linux</LI>
<LI>Solaris</LI>
<LI>Windows</LI>
</UL>
<HR>
<H1><A NAME="synopsis">SYNOPSIS</A></H1>
<PRE>
# Functional style
use Digest::HMAC qw(hmac hmac_hex);
$digest = hmac($data, $key, \&myhash);
print hmac_hex($data, $key, \&myhash);</PRE>
<PRE>
# OO style
use Digest::HMAC;
$hmac = Digest::HMAC->new($key, "Digest::MyHash");</PRE>
<PRE>
$hmac->add($data);
$hmac->addfile(*FILE);</PRE>
<PRE>
$digest = $hmac->digest;
$digest = $hmac->hexdigest;
$digest = $hmac->b64digest;</PRE>
<P>
<HR>
<H1><A NAME="description">DESCRIPTION</A></H1>
<P>HMAC is used for message integrity checks between two parties that
share a secret key, and works in combination with some other Digest
algorithm, usually MD5 or SHA-1. The HMAC mechanism is described in
RFC 2104.</P>
<P>HMAC follow the common <CODE>Digest::</CODE> interface, but the constructor
takes the secret key and the name of some other simple <CODE>Digest::</CODE>
as argument.</P>
<P>
<HR>
<H1><A NAME="see also">SEE ALSO</A></H1>
<P><A HREF="../../../site/lib/Digest/HMAC_MD5.html">the Digest::HMAC_MD5 manpage</A>, <A HREF="../../../site/lib/Digest/HMAC_SHA1.html">the Digest::HMAC_SHA1 manpage</A></P>
<P>RFC 2104</P>
<P>
<HR>
<H1><A NAME="authors">AUTHORS</A></H1>
<P>Graham Barr <<A HREF="mailto:gbarr@ti.com">gbarr@ti.com</A>>, Gisle Aas <<A HREF="mailto:gisle@aas.no">gisle@aas.no</A>></P>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> Digest::HMAC - Keyed-Hashing for Message Authentication</P></STRONG>
</TD></TR>
</TABLE>
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