signedxml

I have an XML document having structure similar to the following <envelop> <header>blaa</header> <message>blaa blaa</message> <footer></footer> </envelop> I want to digitally sign the header and message elements and add the signature to the footer element. How can I sign the elements and then later verify the signature (using .net c#) ? You should be able to add an XPath-Transform to the Signature. It should look something like this: <Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116"> <XPath xmlns:dsig="&dsig;"> ... </XPath> </Transform> I am not fluent in XPath, but it should

I have a response from a 3-rd party web service. I load an XmlDocument with that response. string txt = readStream.ReadToEnd(); response = new XmlDocument(); response.PreserveWhitespace = true; response.LoadXml(txt); return response; Now I would like to verify that the respones is signed using the certificate. I have a VerifyXmlDoc(XmlDocument xmlDoc) method which I have found on msdn . I know that the message is correct. public bool VerifyXmlDoc(XmlDocument xmlDoc) { SignedXml signed = new SignedXml(xmlDoc); XmlNodeList signatureNodeList = xmlDoc.GetElementsByTagName("Signature"); signed