/// <summary>
/// Tries to sign the specified XML text.
/// </summary>
/// <param name="xmlText">The XML text.</param>
/// <param name="certificate">The certificate.</param>
/// <param name="elementName">The name of the element to be signed.</param>
/// <param name="elementNamespace">The namespace of the element to be signed.</param>
/// <param name="xmlTextSigned">The initial XML text to which the signature was added.</param>
/// <param name="useFingerprint">If true the public key of the certificate will be replaced with the fingerprint in the signature.</param>
/// <returns>True if the signing was possible, false otherwise.</returns>
public static bool TrySignElement(string xmlText, X509Certificate2 certificate, string elementName, string elementNamespace, out string xmlTextSigned, bool useFingerprint = true)
{
xmlTextSigned = null;
var xmlWholeDocument = new XmlDocument();
xmlWholeDocument.PreserveWhitespace = true;
xmlWholeDocument.LoadXml(xmlText);
if (String.IsNullOrEmpty(elementName))
{
return(false);
}
if (String.IsNullOrEmpty(elementNamespace))
{
return(false);
}
// we are signing only an element (part of the big document)
var elements = xmlWholeDocument.GetElementsByTagName(elementName, elementNamespace);
if (elements.Count == 0)
{
return(false);
}
var elementToSign = elements[0] as XmlElement;
var xmlElementDocument = new XmlDocument();
xmlElementDocument.PreserveWhitespace = true;
xmlElementDocument.LoadXml(elementToSign.OuterXml);
EmandatesSignatureOperationsService.GetOrCreateContextForSignatureAdding getOrCreateContextForSignatureAdding = (doc, elem) =>
{
return(GetOrCreateContextForEmandatesSignatureAdding(doc, elem));
};
//todo cip!! you can optimize this one
XmlElement signatureContainer = getOrCreateContextForSignatureAdding(xmlElementDocument, xmlElementDocument.DocumentElement);
XmlSignature.Sign(ref xmlElementDocument, certificate, signatureContainer, "", useFingerprint);
//var xmlSignature = XmlSignature.Sign(ref doc, certificate, xmlContainerElement, "", null, true);
var newnode = xmlWholeDocument.ImportNode(xmlElementDocument.DocumentElement, true);
elementToSign.ParentNode.ReplaceChild(newnode, elementToSign);
var stringWriter = new StringWriter();
var xmlTextWriter = XmlWriter.Create(stringWriter);
xmlWholeDocument.WriteTo(xmlTextWriter);
xmlTextWriter.Flush();
xmlTextSigned = stringWriter.GetStringBuilder().ToString();
return(true);
}
/// <summary>
/// Signs the specified XML text.
/// </summary>
/// <param name="xmlText">The XML text.</param>
/// <param name="certificate">The certificate.</param>
/// <param name="useFingerprint">If true the public key of the certificate will be replaced with the fingerprint in the signature.</param>
/// <returns>The initial XML text to which the signature was added.</returns>
public static string SignDocument(string xmlText, X509Certificate2 certificate, bool useFingerprint = true)
{
var xmlDoc = new XmlDocument();
xmlDoc.PreserveWhitespace = true;
xmlDoc.LoadXml(xmlText);
XmlSignature.Sign(ref xmlDoc, certificate, xmlDoc.DocumentElement, "", useFingerprint);
var stringWriter = new StringWriter();
var xmlTextWriter = XmlWriter.Create(stringWriter);
xmlDoc.WriteTo(xmlTextWriter);
xmlTextWriter.Flush();
xmlText = stringWriter.GetStringBuilder().ToString();
return(xmlText);
}