Initial implementation of EncryptMessage and DecryptMessage.

ByteWriter.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NSspi
+{
+    public static class ByteWriter
+    {
+        // Big endian: Most significant byte at lowest address in memory.
+        
+        public static void WriteInt16_BE( Int16 value, byte[] buffer, int position )
+        {
+            buffer[position + 0] = (byte)( value >> 8 );
+            buffer[position + 1] = (byte)( value );
+        }
+
+        public static void WriteInt32_BE( Int32 value, byte[] buffer, int position )
+        {
+            buffer[position + 0] = (byte)( value >> 24 );
+            buffer[position + 1] = (byte)( value >> 16 );
+            buffer[position + 2] = (byte)( value >> 8 );
+            buffer[position + 3] = (byte)( value);
+
+        }
+
+        public static Int16 ReadInt16_BE( byte[] buffer, int position )
+        {
+            Int16 value;
+
+            value = (Int16)( buffer[position + 0] << 8 );
+            value += (Int16)( buffer[position + 1] );
+
+            return value;
+        }
+
+        public static Int32 ReadInt32_BE( byte[] buffer, int position )
+        {
+            Int32 value;
+
+            value = (Int32)( buffer[position + 0] << 24 );
+            value |= (Int32)( buffer[position + 1] << 16 );
+            value |= (Int32)( buffer[position + 2] << 8 );
+            value |= (Int32)( buffer[position + 3] );
+
+            return value;
+        }
+
+    }
+}