static SignerHelper()
{
var localFileLoader = DependencyService.Get <IResourceLoader>();
using (Stream streamXslt = localFileLoader.OpenFile("PA_AD_RA_v2_3.xml"))
{
byte[] policyFileData = StreamHelper.StreamToByteArray(streamXslt);
policy = new PolicyIdentifier("http://politicas.icpbrasil.gov.br/PA_AD_RA_v2_3.xml", policyFileData, "qipT2sA6/iY9Z14EeVBdoiDWxdqsu5WEuY23mxbADmE=");
}
}
public void Sign(Stream xml, Stream signature, string signedElementXPath, X509Certificate certificate, AsymmetricKeyParameter key, PolicyIdentifier policyId)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.PreserveWhitespace = true;
xmlDoc.Load(xml);
XAdESSignedXml signedXML = new XAdESSignedXml(xmlDoc);
signedXML.SigningKey = key;
signedXML.SignedInfo.SignatureMethod = "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256";
signedXML.Certificate = certificate;
signedXML.SignedElementXPath = signedElementXPath;
signedXML.PolicyId = policyId;
signedXML.SignedInfo.CanonicalizationMethod = "http://www.w3.org/2001/10/xml-exc-c14n#";
signedXML.ComputeXAdESSignature();
XmlElement xmlDigitalSignature = signedXML.GetXml();
//xmlDoc.DocumentElement.AppendChild(xmlDoc.ImportNode(xmlDigitalSignature, true));
XmlTextWriter wr = new XmlTextWriter(signature, Encoding.UTF8);
wr.Formatting = Formatting.None;
xmlDigitalSignature.WriteTo(wr);
wr.Flush();
signature.Position = 0;
}
