Encryption & decryption

gistfile1.cs

public static string Encrypt(this string Message, string passphrase = "")
{
	if (passphrase == "")
		passphrase = ConfigurationManager.AppSettings["encrpytionPassphrase"];

	byte[] Results;
	System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();

	MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
	byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(passphrase));

	TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();

	TDESAlgorithm.Key = TDESKey;
	TDESAlgorithm.Mode = CipherMode.ECB;
	TDESAlgorithm.Padding = PaddingMode.PKCS7;

	byte[] DataToEncrypt = UTF8.GetBytes(Message);

	try
	{
		ICryptoTransform Encryptor = TDESAlgorithm.CreateEncryptor();
		Results = Encryptor.TransformFinalBlock(DataToEncrypt, 0, DataToEncrypt.Length);
	}
	finally
	{
		TDESAlgorithm.Clear();
		HashProvider.Clear();
	}

	return Convert.ToBase64String(Results);
}

public static string Decrypt(this string Message, string passphrase = "")
{
	if (passphrase == "")
		passphrase = ConfigurationManager.AppSettings["encrpytionPassphrase"];
	if (Message == string.Empty)
		return string.Empty;

	byte[] Results;
	System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();

	MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
	byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(passphrase));

	TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();

	TDESAlgorithm.Key = TDESKey;
	TDESAlgorithm.Mode = CipherMode.ECB;
	TDESAlgorithm.Padding = PaddingMode.PKCS7;

	byte[] DataToDecrypt = Convert.FromBase64String(Message);

	try
	{
		ICryptoTransform Decryptor = TDESAlgorithm.CreateDecryptor();
		Results = Decryptor.TransformFinalBlock(DataToDecrypt, 0, DataToDecrypt.Length);
	}
	catch
	{
		Results = new byte[0];
	}
	finally
	{
		TDESAlgorithm.Clear();
		HashProvider.Clear();
	}

	return UTF8.GetString(Results);
}