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copied!<p>You're going to want to use the <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.aspx" rel="noreferrer"><code>System.Security.Cryptography</code></a> namespace; specifically, the <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.md5.aspx" rel="noreferrer"><code>MD5</code> class</a> or the <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.sha256.aspx" rel="noreferrer"><code>SHA256</code> class</a>. </p> <p>Drawing a bit from the code on <a href="http://bloggingabout.net/blogs/rick/archive/2005/05/18/4118.aspx" rel="noreferrer">this page</a>, and with the knowledge that both classes have the same base class (<a href="http://msdn.microsoft.com/en-us/library/k50cye1b.aspx" rel="noreferrer"><code>HashAlgorithm</code></a>), you could use a function like this:</p> <pre><code>public string ComputeHash(string input, HashAlgorithm algorithm) { Byte[] inputBytes = Encoding.UTF8.GetBytes(input); Byte[] hashedBytes = algorithm.ComputeHash(inputBytes); return BitConverter.ToString(hashedBytes); } </code></pre> <p>Then you could call it like this (for MD5):</p> <pre><code>string hPassword = ComputeHash(password, new MD5CryptoServiceProvider()); </code></pre> <p>Or for SHA256:</p> <pre><code>string hPassword = ComputeHash(password, new SHA256CryptoServiceProvider()); </code></pre> <hr> <p><strong>Edit: Adding Salt Support</strong><br> As dtb pointed out in the comments, this code would be stronger if it included the ability to add <a href="http://en.wikipedia.org/wiki/Salt_(cryptography)" rel="noreferrer">salt</a>. If you're not familiar with it, salt is a set of random bits that are included as an input to the hashing function, which goes a long way to thwart dictionary attacks against a hashed password (e.g., using a <a href="http://en.wikipedia.org/wiki/Rainbow_table" rel="noreferrer">rainbow table</a>). Here's a modified version of the <code>ComputeHash</code> function that supports salt:</p> <pre><code>public static string ComputeHash(string input, HashAlgorithm algorithm, Byte[] salt) { Byte[] inputBytes = Encoding.UTF8.GetBytes(input); // Combine salt and input bytes Byte[] saltedInput = new Byte[salt.Length + inputBytes.Length]; salt.CopyTo(saltedInput, 0); inputBytes.CopyTo(saltedInput, salt.Length); Byte[] hashedBytes = algorithm.ComputeHash(saltedInput); return BitConverter.ToString(hashedBytes); } </code></pre> <p>Hope this has been helpful!</p>

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