c# - Sign XML with digital signature -

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i'm working web-service requires digitally signed xml posted via http post request.
gave me 1 file (key.dat) should apply xml.
how can it?

you can take on here:

private static xmlelement getxmldigitalsignature(xmldocument x, asymmetricalgorithm key) {     var signedxml = new signedxml(x) { signingkey = key };     var reference = new reference { uri = "", transformchain = new transformchain(), };      reference.addtransform(new xmldsigenvelopedsignaturetransform());      signedxml.addreference(reference);     signedxml.computesignature();      return signedxml.getxml(); }  var signature = getxmldigitalsignature(xmldocument, algorithm); xmldocument.firstchild.appendchild(xmldocument.importnode(signature, true));

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