Add project files.

AscNet.Common/Util/Miscs.cs

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+namespace AscNet.Common.Util
+{
+    public static class Miscs
+    {
+        public static byte[] HexStringToByteArray(string hex)
+        {
+            if (hex.Length % 2 == 1)
+                throw new Exception("The binary key cannot have an odd number of digits");
+
+            byte[] arr = new byte[hex.Length >> 1];
+
+            for (int i = 0; i < hex.Length >> 1; ++i)
+            {
+                arr[i] = (byte)((GetHexVal(hex[i << 1]) << 4) + (GetHexVal(hex[(i << 1) + 1])));
+            }
+
+            return arr;
+        }
+
+        private static int GetHexVal(char hex)
+        {
+            int val = (int)hex;
+            //For uppercase A-F letters:
+            //return val - (val < 58 ? 48 : 55);
+            //For lowercase a-f letters:
+            //return val - (val < 58 ? 48 : 87);
+            //Or the two combined, but a bit slower:
+            return val - (val < 58 ? 48 : (val < 97 ? 55 : 87));
+        }
+        public static byte ToByte(this bool val)
+        {
+            return val ? (byte)1 : (byte)0;
+        }
+    }
+}