/// <summary>
/// Calculates the MAC for a ciphertext.
/// </summary>
/// <param name="ciphertext">The ciphertext.</param>
/// <param name="key">The key.</param>
/// <returns>The MAC.</returns>
public static byte[] CalculateMac(byte[] ciphertext, byte[] key)
{
return(Hash.Pbkdf2(ciphertext, key, Rijndael256Settings.HashIterations));
}