public bool VerifyXmlFromStream(System.IO.Stream SignedXmlDocumentStream)
{
// load the document to be verified
XmlDocument xd = new XmlDocument();
xd.PreserveWhitespace = true;
SignedXmlDocumentStream.Position = 0; //Bugfix
xd.Load(SignedXmlDocumentStream);
SignedXmlWithId signedXml = new SignedXmlWithId(xd);
// load the first <signature> node and load the signature
XmlNode MessageSignatureNode =
xd.GetElementsByTagName("Signature")[0];
signedXml.LoadXml((XmlElement)MessageSignatureNode);
// get the cert from the signature
X509Certificate2 certificate = null;
foreach (KeyInfoClause clause in signedXml.KeyInfo)
{
if (clause is KeyInfoX509Data)
{
if (((KeyInfoX509Data)clause).Certificates.Count > 0)
{
certificate =
(X509Certificate2)((KeyInfoX509Data)clause).Certificates[0];
}
}
}
// check the signature and return the result.
return signedXml.CheckSignature(certificate, true);
}
