Web.config machine key generator

MachineKeyGenerator.cs

[TestFixture]
public class MachineKeyGenerator
{
    [Test]
    public void GenerateMachineKey()
    {
        Console.Out.WriteLine(@"<machineKey validationKey=""{0}"" decryptionKey=""{1}""/>", Key(512), Key(192));
    }

    private static string Key(int bits)
    {
        var cryptoProvider = new RNGCryptoServiceProvider();
        var buffer = new byte[bits/8];
        cryptoProvider.GetBytes(buffer);
        return BytesToHexString(buffer);
    }

    static string BytesToHexString(byte[] bytes)
    {
        var hexString = new StringBuilder(64);
        foreach (byte t in bytes)
        {
            hexString.Append(String.Format("{0:X2}", t));
        }
        return hexString.ToString();
    }
}