/// <summary>
/// Calculates the SHA512 hash of a stream
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static string GetStreamHashSHA512(Stream stream)
{
string result = null;
using (HashAlgorithm algo = new SHA512Managed())
{
algo.TranformStream(stream);
result = algo.GetAsString();
algo.Clear();
}
return(result);
}