private byte[] GetXDocumentHash(XDocument xdocument)
{
MemoryStream memoryStream = new MemoryStream();
using (XmlWriter xmlWriter = XmlWriter.Create(memoryStream))
{
xdocument.WriteTo(xmlWriter);
}
memoryStream.Position = 0;
var xfrm = new System.Security.Cryptography.Xml.XmlDsigC14NTransform(false);
xfrm.LoadInput(memoryStream);
byte[] result = xfrm.GetDigestedOutput(new System.Security.Cryptography.SHA1Managed());
return result;
}