private static bool VerificarFirma(string pathXmlSigned, string pathCert, string passCert)
{
var cert = RSAHelper.GetX509Certificate(pathCert, passCert);
var key = (RSA)cert.PrivateKey;
XmlDocument xmlDoc = new XmlDocument();
SignedXml signedXml = new SignedXml(xmlDoc);
XmlNodeList nodeList = xmlDoc.GetElementsByTagName("Signature");
signedXml.LoadXml((XmlElement)nodeList[0]);
return(signedXml.CheckSignature(key));
}
public static string FirmarDocumentoXML(string pathXmlDocument, string RutaCertificadoDigital, string PasswordCertificado)
{
XmlDocument documentXml = new XmlDocument();
documentXml.PreserveWhitespace = true;
documentXml.Load(pathXmlDocument);
var nodoExtension = documentXml.GetElementsByTagName("ExtensionContent", EspacioNombres.CommonExtensionComponents).Item(0);
if (nodoExtension == null)
{
throw new InvalidOperationException("No se pudo encontrar el nodo ExtensionContent en el XML");
}
nodoExtension.RemoveAll();
SignedXml firmado = new SignedXml(documentXml);
var xmlSignature = firmado.Signature;
var cert = RSAHelper.GetX509Certificate(RutaCertificadoDigital, PasswordCertificado);
firmado.SigningKey = (RSA)cert.PrivateKey;
//digest info agregada en la seccion firma
var env = new XmlDsigEnvelopedSignatureTransform();
Reference reference = new Reference();
reference.AddTransform(env);
reference.Uri = "";
firmado.AddReference(reference);
firmado.SignedInfo.SignatureMethod = "http://www.w3.org/2000/09/xmldsig#rsa-sha1";
reference.DigestMethod = "http://www.w3.org/2000/09/xmldsig#sha1";
// info para la llave publica
KeyInfo keyInfo = new KeyInfo();
keyInfo.AddClause(new KeyInfoX509Data(cert));
xmlSignature.KeyInfo = keyInfo;
xmlSignature.Id = "SignatureErickOrlando";
firmado.ComputeSignature();
// Recuperamos el valor Hash de la firma para este documento.
if (reference.DigestValue != null)
{
ModuloDoc moduloFactura = new ModuloDoc();
moduloFactura.DigestValue = Convert.ToBase64String(reference.DigestValue);
}
nodoExtension.AppendChild(firmado.GetXml());
var settings = new XmlWriterSettings()
{
Encoding = Encoding.GetEncoding("ISO-8859-1")
};
string resultado = String.Empty;
using (var memDoc = new MemoryStream())
{
using (var writer = XmlWriter.Create(memDoc, settings))
{
documentXml.WriteTo(writer);
}
resultado = Convert.ToBase64String(memDoc.ToArray());
}
return(resultado);
}
