/// <summary>
/// Verifies the specified XML text signature.
/// </summary>
/// <param name="xmlText">The XML text.</param>
/// <param name="certificate">The certificate.</param>
///<returns>True if the signature is valid, false otherwise</returns>
public static bool VerifyDocument(string xmlText, X509Certificate2 certificate)
{
var xmlDoc = new XmlDocument();
xmlDoc.PreserveWhitespace = true;
xmlDoc.LoadXml(xmlText);
XmlElement signatureElement = XmlSignature.GetElementUnderRoot(xmlDoc.DocumentElement, "Signature", "http://www.w3.org/2000/09/xmldsig#") as XmlElement;
var result = XmlSignature.CheckSignature(xmlDoc, certificate, signatureElement);
return(result);
}
/// <summary>
/// Tries to verify the specified XML text signature.
/// </summary>
/// <param name="xmlText">The XML text.</param>
/// <param name="elementName">The name of the element signature to be verified.</param>
/// <param name="elementNamespace">The namespace of the element signature to be verified.</param>
/// <param name="isValidSignature">True if the signature is valid and placed properly, false otherwise.</param>
/// <returns>True if the verifying was possible, false otherwise.</returns>
public static bool TryVerifyElement(string xmlText, string elementName, string elementNamespace, out bool isValidSignature)
{
isValidSignature = false;
if (String.IsNullOrEmpty(elementName))
{
return(false);
}
var xmlDoc = new XmlDocument();
xmlDoc.PreserveWhitespace = true;
xmlDoc.LoadXml(xmlText);
var elements = xmlDoc.GetElementsByTagName(elementName, elementNamespace);
if (elements.Count == 0)
{
return(false);
}
XmlElement elementToSign = elements[0] as XmlElement;
var xmlElementDoc = new XmlDocument();
xmlElementDoc.PreserveWhitespace = true;
xmlElementDoc.LoadXml(elementToSign.OuterXml);
//XmlElement element = elementToSign;
//var keyInfo = XmlSignature.GetElementUnderRoot(element as XmlElement, "KeyInfo");
//var x509Data = XmlSignature.GetElementUnderRoot(keyInfo as XmlElement, "X509Data");
//var x509Certificate = XmlSignature.GetElementUnderRoot(x509Data as XmlElement, "X509Certificate");
//byte[] certificate = Encoding.Unicode.GetBytes(x509Certificate.InnerText);
X509Certificate2 cert = ExtractCertificate(xmlElementDoc);
// the signature should have been placed inside its 'MndtAccptncRpt' element (more specific, inside a <SplmtryData><Envlp>....</Envlp></SplmtryData> container)
isValidSignature = XmlSignature.CheckSignature(xmlElementDoc, cert,
GetEmandatesSignatureElement(xmlElementDoc.DocumentElement));
return(true);
}
