Malformed Reference Element

Question

I am attempting to add References to my Security Header and am running into a fairly generic error:

Malformed Reference Element

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Answer 1

It looks like, at least for the time being, the answer to getting this working is as follows.

Instead of using the SignedXml class, create a new SignedXmlWithId object, using the class detailed here.

// Create a new XML Document.
XmlDocument xdoc = new XmlDocument();

xdoc.PreserveWhitespace = true;

// Load the passed XML File using its name.
xdoc.Load(new XmlTextReader(fileName));

// Create a SignedXml Object.
//SignedXml xSigned = new SignedXml(xdoc);
SignedXmlWithId xSigned = new SignedXmlWithId(xdoc); // Use this class instead of the SignedXml class above.

// Add the key to the SignedXml document.
xSigned.SigningKey = cert.PrivateKey;
xSigned.Signature.Id = SignatureID;
xSigned.SignedInfo.CanonicalizationMethod = 
        SignedXml.XmlDsigExcC14NWithCommentsTransformUrl;

//Initialize a variable to contain the ID of the Timestamp element.
string elementId = TimestampID;

Reference reference = new Reference()
{
    Uri = "#" + elementId
};

XmlDsigExcC14NTransform env = new XmlDsigExcC14NTransform();
env.InclusiveNamespacesPrefixList = _includedPrefixList;
reference.AddTransform(env);

xSigned.AddReference(reference);

// Add Key Information (omitted)

// Compute Signature
xSigned.ComputeSignature();