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    <p>I'm not sure since Microsoft didn't bother to say what standard their class conforms to, but I suspect that <a href="http://www.itl.nist.gov/fipspubs/fip113.htm" rel="nofollow">this NIST document</a> is what the Microsoft class is computing, only using triple DES in place of DES.</p> <p>I guess you will have to write your own method using the primitives in mcrypt.</p> <p>EDIT 1: </p> <p>Inspired by the bounty, I have these two examples showing equivalent result in PHP and C#.</p> <p>First, C#:</p> <pre><code>using System; using System.Text; using System.Security.Cryptography; namespace TDESMacExample { class MainClass { public static void Main (string[] args) { var keyString = "012345678901234567890123"; var keyBytes = Encoding.ASCII.GetBytes(keyString); var mac = new MACTripleDES(keyBytes); var data = "please authenticate me example number one oh one point seven niner"; Console.WriteLine(data.Length); var macResult = mac.ComputeHash(Encoding.ASCII.GetBytes(data)); Console.WriteLine(BitConverter.ToString(macResult)); // B1-29-14-74-EA-E2-74-2D } } } </code></pre> <p>Next, PHP: </p> <pre><code> &lt;?php $data = 'please authenticate me example number one oh one point seven niner'; $key = '012345678901234567890123'; // Key must be 24 bytes long $iv = '\x00\x00\x00\x00\x00\x00\x00\x00'; // All zero IV is required $cipher = mcrypt_cbc(MCRYPT_3DES, $key, $data, MCRYPT_ENCRYPT, $iv); $mac_result = substr($cipher, -8); // Last 8 bytes of the cipher are the MAC echo "mac result : " . bin2hex($mac_result); echo "&lt;br&gt;"; ?&gt; </code></pre>
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    1. COSorry for the delay - I managed to get the code done and it's the same way you have done.
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