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    <p>Actually this is kind of strange, with the string conversions - which the membership provider does to put them into config files. Hashes and salts are binary blobs, you don't need to convert them to strings unless you want to put them into text files. </p> <p>In my book, <a href="http://www.wrox.com/WileyCDA/WroxTitle/Beginning-ASP-NET-Security.productCd-0470743654.html" rel="noreferrer">Beginning ASP.NET Security</a>, (oh finally, an excuse to pimp the book) I do the following</p> <pre><code>static byte[] GenerateSaltedHash(byte[] plainText, byte[] salt) { HashAlgorithm algorithm = new SHA256Managed(); byte[] plainTextWithSaltBytes = new byte[plainText.Length + salt.Length]; for (int i = 0; i &lt; plainText.Length; i++) { plainTextWithSaltBytes[i] = plainText[i]; } for (int i = 0; i &lt; salt.Length; i++) { plainTextWithSaltBytes[plainText.Length + i] = salt[i]; } return algorithm.ComputeHash(plainTextWithSaltBytes); } </code></pre> <p>The salt generation is as the example in the question. You can convert text to byte arrays using <code>Encoding.UTF8.GetBytes(string)</code>. If you must convert a hash to its string representation you can use <code>Convert.ToBase64String</code> and <code>Convert.FromBase64String</code> to convert it back.</p> <p>You should note that you cannot use the equality operator on byte arrays, it checks references and so you should simply loop through both arrays checking each byte thus</p> <pre><code>public static bool CompareByteArrays(byte[] array1, byte[] array2) { if (array1.Length != array2.Length) { return false; } for (int i = 0; i &lt; array1.Length; i++) { if (array1[i] != array2[i]) { return false; } } return true; } </code></pre> <p><strong>Always</strong> use a new salt per password. Salts do not have to be kept secret and can be stored alongside the hash itself.</p>
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    1. POHash and salt passwords in C#
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    1. CO+1 for your book pimping! ;-)
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    2. COThanks for this advice - really helped get me started. I also came across this link < http://www.dijksterhuis.org/creating-salted-hash-values-in-c/ > which I found was good practical advice and mirrors much of what was said in this post
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    3. COnifty LINQ statement refactor for CompareByteArrays `return array1.Length == array2.Length && !array1.Where((t, i) => t != array2[i]).Any();`
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