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<link title="Cryptokit" rel="Chapter" href="Cryptokit.html"><title>Cryptokit.Block.mac_final_triple</title>
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<center><h1>Class <a href="type_Cryptokit.Block.mac_final_triple.html">Cryptokit.Block.mac_final_triple</a></h1></center>
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<pre><span class="keyword">class</span> <a name="TYPEmac_final_triple"></a>mac_final_triple : <code class="type">?iv:string -> ?pad:<a href="Cryptokit.Padding.scheme.html">Cryptokit.Padding.scheme</a> -> <a href="Cryptokit.Block.block_cipher.html">block_cipher</a> -> <a href="Cryptokit.Block.block_cipher.html">block_cipher</a> -> <a href="Cryptokit.Block.block_cipher.html">block_cipher</a> -> </code><code class="type"><a href="Cryptokit.hash.html">Cryptokit.hash</a></code></pre>Build a MAC (keyed hash function) from the given block ciphers
<code class="code">c1</code>, <code class="code">c2</code> and <code class="code">c3</code>. The input is run through <code class="code">c1</code> in CBC
mode, as described for <a href="Cryptokit.Block.mac.html"><code class="code">Cryptokit.Block.mac</code></a>. The final
initialization vector is then super-enciphered by <code class="code">c2</code>, then
by <code class="code">c3</code>, to provide the final MAC. This construction results
in a MAC that is as nearly as fast as <a href="Cryptokit.Block.mac.html"><code class="code">Cryptokit.Block.mac</code></a>
<code class="code">c1</code>, but more resistant against brute-force key search
because of the additional final encryption through <code class="code">c2</code> and
<code class="code">c3</code>.<br>
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