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// Aaron Bockover <abockover@novell.com>
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// Copyright (C) 2008 Novell, Inc.
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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using System.Text.RegularExpressions;
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using System.Security.Cryptography;
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public static class CryptoUtil
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// A-Z is ignored on purpose
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private static Regex md5_regex = new Regex ("^[a-f0-9]{32}$", RegexOptions.Compiled);
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private static MD5 md5 = MD5.Create ();
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public static bool IsMd5Encoded (string text)
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return text == null || text.Length != 32 ? false : md5_regex.IsMatch (text);
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public static string Md5Encode (string text)
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return Md5Encode (text, Encoding.ASCII);
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public static string Md5Encode (string text, Encoding encoding)
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if (String.IsNullOrEmpty (text)) {
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hash = md5.ComputeHash (encoding.GetBytes (text));
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public static string Md5EncodeStream (Stream stream)
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hash = md5.ComputeHash (stream);
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private static string ToHex (byte [] hash)
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StringBuilder shash = new StringBuilder ();
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for (int i = 0; i < hash.Length; i++) {
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shash.Append (hash[i].ToString ("x2"));
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return shash.ToString ();