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POPBKDF2 implementation in C# with Rfc2898DeriveBytes
 

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    <p>Guys, I'm trying to implement a PBKDF2 function in C# that creates a WPA Shared key. I've found some here: <a href="http://msdn.microsoft.com/en-us/magazine/cc163913.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/magazine/cc163913.aspx</a> that seems to produce a valid result, but it's one byte too short... and the wrong PSK value.</p> <p>To test the output, I am comparing it to this: <a href="http://www.xs4all.nl/~rjoris/wpapsk.html" rel="noreferrer">http://www.xs4all.nl/~rjoris/wpapsk.html</a> or <a href="http://anandam.name/pbkdf2/" rel="noreferrer">http://anandam.name/pbkdf2/</a></p> <p>I did find one way of getting this to work with a built in library to C# called Rfc2898DeriveBytes. Using this, I get a valid output using:</p> <pre><code>Rfc2898DeriveBytes k3 = new Rfc2898DeriveBytes(pwd1, salt1, 4096); byte[] answers = k3.GetBytes(32); </code></pre> <p>Now, the one limitation I have using Rfc2898DeriveBytes is the "salt" must be 8 octets long. If it is shorter, the Rfc2898DeriveBytes throws an exception. I was thinking all I had to do was pad the salt (if it was shorter) to 8 bytes, and I'd be good. But NO! I've tried pretty much every combination of padding with a shorter salt, but I cannot duplicate the results I get from those two websites above.</p> <p>So bottom line is, does this mean the Rfc2898DeriveBytes just simply won't work with a source salt shorter than 8 bytes? If so, does anyone know of any C# code I could use that implements PBKDF2 for WPA Preshared key?</p>
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    1. COyou could use this: [http://msdn.microsoft.com/en-us/library/system.web.helpers.crypto.hashpassword%28v=vs.99%29.aspx](http://msdn.microsoft.com/en-us/library/system.web.helpers.crypto.hashpassword%28v=vs.99%29.aspx)
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