Extract a common SHA1 helper.

OpenRA.Game/CryptoUtil.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2016 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace OpenRA
+{
+	public static class CryptoUtil
+	{
+		public static string SHA1Hash(Stream data)
+		{
+			using (var csp = SHA1.Create())
+				return new string(csp.ComputeHash(data).SelectMany(a => a.ToString("x2")).ToArray());
+		}
+
+		public static string SHA1Hash(byte[] data)
+		{
+			using (var csp = SHA1.Create())
+				return new string(csp.ComputeHash(data).SelectMany(a => a.ToString("x2")).ToArray());
+		}
+
+		public static string SHA1Hash(string data)
+		{
+			return SHA1Hash(Encoding.UTF8.GetBytes(data));
+		}
+	}
+}