using System;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Text;

namespace Microsoft.Samples.AppUpdater
{
	public class KeyValidator : MarshalByRefObject
	{
		public bool Validate(string assemblyLocation, byte[][] keyList, string[] ExceptionList)
		{
			try
			{
				if (IsException(assemblyLocation, ExceptionList))
				{
					return true;
				}
				Assembly assembly = Assembly.LoadFrom(assemblyLocation);
				return CompareKeys(assembly.GetName().GetPublicKey(), keyList);
			}
			catch (Exception)
			{
				return false;
			}
		}

		public static bool IsException(string FilePath, string[] ExceptionList)
		{
			if (ExceptionList == null)
			{
				return false;
			}
			foreach (string text in ExceptionList)
			{
				if (Path.GetFileName(FilePath).ToLower(new CultureInfo("en-US")) == text.ToLower(new CultureInfo("en-US")))
				{
					return true;
				}
			}
			return false;
		}

		public static bool CompareKeys(byte[] assemblyKey, byte[][] validKeys)
		{
			try
			{
				ASCIIEncoding aSCIIEncoding = new ASCIIEncoding();
				foreach (byte[] bytes in validKeys)
				{
					if (aSCIIEncoding.GetString(bytes) == aSCIIEncoding.GetString(assemblyKey))
					{
						return true;
					}
				}
				return false;
			}
			catch (Exception)
			{
				return false;
			}
		}
	}
}