/// <summary>
/// Carga el documento XML especificado y establece para firmar el elemento especificado en elementId
/// </summary>
/// <param name="xmlDocument"></param>
/// <param name="elementId"></param>
/// <param name="mimeType"></param>
public void SetContentInternallyDetached(XmlDocument xmlDocument, string elementId, string mimeType)
{
_document = (XmlDocument)xmlDocument.Clone();
_document.PreserveWhitespace = true;
Reference reference = new Reference();
reference.Uri = "#" + elementId;
reference.Id = "Reference-" + Guid.NewGuid().ToString();
_objectReference = reference.Id;
_mimeType = mimeType;
if (mimeType == "text/xml")
{
XmlDsigC14NTransform transform = new XmlDsigC14NTransform();
reference.AddTransform(transform);
}
else
{
XmlDsigBase64Transform transform = new XmlDsigBase64Transform();
reference.AddTransform(transform);
}
_xadesSignedXml = new XadesSignedXml(_document);
_xadesSignedXml.AddReference(reference);
}
/// <summary>
/// Inserta un documento para generar una firma internally detached.
/// </summary>
/// <param name="content"></param>
/// <param name="mimeType"></param>
public void SetContentInternallyDetached(byte[] content, string mimeType, string fileName = null)
{
_document = new XmlDocument();
XmlElement rootElement = _document.CreateElement("DOCFIRMA");
_document.AppendChild(rootElement);
string id = "CONTENT-" + Guid.NewGuid().ToString();
Reference reference = new Reference();
reference.Uri = "#" + id;
reference.Id = "Reference-" + Guid.NewGuid().ToString();
_objectReference = reference.Id;
_mimeType = mimeType;
XmlElement contentElement = _document.CreateElement("CONTENT");
if (mimeType == "text/xml")
{
XmlDocument doc = new XmlDocument();
doc.PreserveWhitespace = true;
doc.Load(new MemoryStream(content));
contentElement.InnerXml = doc.DocumentElement.OuterXml;
XmlDsigC14NTransform transform = new XmlDsigC14NTransform();
reference.AddTransform(transform);
}
else if (mimeType == "hash/sha256")
{
contentElement.SetAttribute("Encoding", "http://www.w3.org/2000/09/xmldsig#base64");
contentElement.SetAttribute("MimeType", mimeType);
if (!string.IsNullOrEmpty(fileName))
{
contentElement.SetAttribute("URI", Path.GetFileName(fileName));
}
using (SHA256 sha2 = SHA256.Create())
{
contentElement.InnerText = Convert.ToBase64String(sha2.ComputeHash(content));
}
XmlDsigBase64Transform transform = new XmlDsigBase64Transform();
reference.AddTransform(transform);
}
else
{
contentElement.SetAttribute("Encoding", "http://www.w3.org/2000/09/xmldsig#base64");
contentElement.InnerText = Convert.ToBase64String(content);
XmlDsigBase64Transform transform = new XmlDsigBase64Transform();
reference.AddTransform(transform);
}
contentElement.SetAttribute("Id", id);
rootElement.AppendChild(contentElement);
_xadesSignedXml = new XadesSignedXml(_document);
_xadesSignedXml.AddReference(reference);
}
/// <summary>
/// Inserta un contenido XML para generar una firma enveloping.
/// </summary>
/// <param name="xmlDocument"></param>
public void SetContentEveloping(XmlDocument xmlDocument)
{
Reference reference = new Reference();
_xadesSignedXml = new XadesSignedXml();
XmlDocument doc = (XmlDocument)xmlDocument.Clone();
doc.PreserveWhitespace = true;
if (doc.ChildNodes[0].NodeType == XmlNodeType.XmlDeclaration)
{
doc.RemoveChild(doc.ChildNodes[0]);
}
//Add an object
string dataObjectId = "DataObject-" + Guid.NewGuid().ToString();
System.Security.Cryptography.Xml.DataObject dataObject = new System.Security.Cryptography.Xml.DataObject();
dataObject.Data = doc.ChildNodes;
dataObject.Id = dataObjectId;
_xadesSignedXml.AddObject(dataObject);
reference.Id = "Reference-" + Guid.NewGuid().ToString();
reference.Uri = "#" + dataObjectId;
reference.Type = SignedXml.XmlDsigNamespaceUrl + "Object";
XmlDsigC14NTransform transform = new XmlDsigC14NTransform();
reference.AddTransform(transform);
_objectReference = reference.Id;
_mimeType = "text/xml";
_xadesSignedXml.AddReference(reference);
_document = null;
}
/// <summary>
/// Inserta un documento para generar una firma externally detached.
/// </summary>
/// <param name="fileName"></param>
public void SetContentExternallyDetached(string fileName)
{
Reference reference = new Reference();
_document = new XmlDocument();
_xadesSignedXml = new XadesSignedXml();
reference.Uri = "file://" + fileName.Replace("\\", "/");
reference.Id = "Reference-" + Guid.NewGuid().ToString();
if (reference.Uri.EndsWith(".xml") || reference.Uri.EndsWith(".XML"))
{
_mimeType = "text/xml";
reference.AddTransform(new XmlDsigC14NTransform());
}
_objectReference = reference.Id;
_xadesSignedXml.AddReference(reference);
}
/// <summary>
/// Realiza la contrafirma de la firma actual
/// </summary>
/// <param name="certificate"></param>
/// <param name="signMethod"></param>
public void CounterSign(X509Certificate2 certificate, SignMethod? signMethod = null)
{
SetSignatureId();
if (_xadesSignedXml == null)
{
throw new Exception("No hay ninguna firma XADES cargada previamente.");
}
if (certificate == null)
{
throw new Exception("Es necesario un certificado válido para la firma.");
}
if (signMethod.HasValue)
{
this.SignMethod = signMethod.Value;
}
_signCertificate = certificate;
XadesSignedXml counterSignature = new XadesSignedXml(_document);
SetCryptoServiceProvider();
counterSignature.SigningKey = _rsaKey;
Reference reference = new Reference();
reference.Uri = "#" + _xadesSignedXml.SignatureValueId;
reference.Id = "Reference-" + Guid.NewGuid().ToString();
reference.Type = "http://uri.etsi.org/01903#CountersignedSignature";
reference.AddTransform(new XmlDsigC14NTransform());
counterSignature.AddReference(reference);
_objectReference = reference.Id;
KeyInfo keyInfo = new KeyInfo();
keyInfo.Id = "KeyInfoId-" + _signatureId;
keyInfo.AddClause(new KeyInfoX509Data((X509Certificate)_signCertificate));
keyInfo.AddClause(new RSAKeyValue((RSA)_rsaKey));
counterSignature.KeyInfo = keyInfo;
Reference referenceKeyInfo = new Reference();
referenceKeyInfo.Id = "ReferenceKeyInfo-" + _signatureId;
referenceKeyInfo.Uri = "#KeyInfoId-" + _signatureId;
counterSignature.AddReference(referenceKeyInfo);
counterSignature.Signature.Id = _signatureId;
counterSignature.SignatureValueId = _signatureValueId;
XadesObject counterSignatureXadesObject = new XadesObject();
counterSignatureXadesObject.Id = "CounterSignatureXadesObject-" + Guid.NewGuid().ToString();
counterSignatureXadesObject.QualifyingProperties.Target = "#" + _signatureId;
counterSignatureXadesObject.QualifyingProperties.SignedProperties.Id = "SignedProperties-" + _signatureId;
AddSignatureProperties(counterSignatureXadesObject.QualifyingProperties.SignedProperties.SignedSignatureProperties,
counterSignatureXadesObject.QualifyingProperties.SignedProperties.SignedDataObjectProperties,
counterSignatureXadesObject.QualifyingProperties.UnsignedProperties.UnsignedSignatureProperties,
"text/xml", _signCertificate);
counterSignature.AddXadesObject(counterSignatureXadesObject);
foreach (Reference signReference in counterSignature.SignedInfo.References)
{
signReference.DigestMethod = _refsMethodUri;
}
counterSignature.AddXadesNamespace = true;
counterSignature.ComputeSignature();
UnsignedProperties unsignedProperties = _xadesSignedXml.UnsignedProperties;
unsignedProperties.UnsignedSignatureProperties.CounterSignatureCollection.Add(counterSignature);
_xadesSignedXml.UnsignedProperties = unsignedProperties;
UpdateDocument();
_xadesSignedXml = new XadesSignedXml(_document);
XmlNode xmlNode = _document.SelectSingleNode("//*[@Id='" + _signatureId + "']");
_xadesSignedXml.LoadXml((XmlElement)xmlNode);
}
/// <summary>
/// Añade una firma al documento
/// </summary>
/// <param name="certificate"></param>
/// <param name="signMethod"></param>
public void CoSign(X509Certificate2 certificate, SignMethod? signMethod = null)
{
if (_xadesSignedXml == null)
{
throw new Exception("No hay ninguna firma XADES creada previamente.");
}
if (certificate == null)
{
throw new Exception("Es necesario un certificado válido para la firma.");
}
Reference refContent = _xadesSignedXml.SignedInfo.References[0] as Reference;
if (refContent == null)
{
throw new Exception("No se ha podido encontrar la referencia del contenido firmado.");
}
if (_xadesSignedXml.XadesObject.QualifyingProperties.SignedProperties.SignedDataObjectProperties.DataObjectFormatCollection.Count > 0)
{
foreach (DataObjectFormat dof in _xadesSignedXml.XadesObject.QualifyingProperties.SignedProperties.SignedDataObjectProperties.DataObjectFormatCollection)
{
if (dof.ObjectReferenceAttribute == ("#" + refContent.Id))
{
_mimeType = dof.MimeType;
break;
}
}
}
var destination = _xadesSignedXml.GetSignatureElement().ParentNode;
_xadesSignedXml = new XadesSignedXml(_document);
refContent.Id = "Reference-" + Guid.NewGuid().ToString();
_xadesSignedXml.AddReference(refContent);
if (destination.NodeType != XmlNodeType.Document)
{
_xadesSignedXml.SignatureNodeDestination = (XmlElement)destination;
}
else
{
_xadesSignedXml.SignatureNodeDestination = ((XmlDocument)destination).DocumentElement;
}
_objectReference = refContent.Id;
SetSignatureId();
Sign(certificate, signMethod);
}
/// <summary>
/// Construye el documento enveloped
/// </summary>
private void CreateEnvelopedDocument()
{
Reference reference = new Reference();
_xadesSignedXml = new XadesSignedXml(_document);
reference.Id = "Reference-" + Guid.NewGuid().ToString();
reference.Uri = "";
for (int i = 0; i < _document.DocumentElement.Attributes.Count; i++)
{
if (_document.DocumentElement.Attributes[i].Name.Equals("id", StringComparison.InvariantCultureIgnoreCase))
{
reference.Uri = "#" + _document.DocumentElement.Attributes[i].Value;
break;
}
}
XmlDsigEnvelopedSignatureTransform xmlDsigEnvelopedSignatureTransform = new XmlDsigEnvelopedSignatureTransform();
reference.AddTransform(xmlDsigEnvelopedSignatureTransform);
_objectReference = reference.Id;
_xadesSignedXml.AddReference(reference);
}
private void addCounterSignatureButton_Click(object sender, System.EventArgs e)
{
X509Certificate2 certificateForCounterSignature = this.LetUserChooseCertificate();
if (certificateForCounterSignature != null)
{
this.xadesSignedXml.SignatureValueId = this.signatureValueIdTextBox.Text;
XmlElement parentSignatureXmlElement = this.xadesSignedXml.GetXml();
XmlDocument parentSignatureXmlDocument = new XmlDocument();
parentSignatureXmlDocument.AppendChild(parentSignatureXmlDocument.ImportNode(parentSignatureXmlElement, true));
XadesSignedXml counterSignature = new XadesSignedXml(parentSignatureXmlDocument);
RSACryptoServiceProvider rsaKey = (RSACryptoServiceProvider) this.Certificate.PrivateKey;
counterSignature.SigningKey = rsaKey;
KeyInfo keyInfo = new KeyInfo();
keyInfo.AddClause(new KeyInfoX509Data((X509Certificate) certificateForCounterSignature));
keyInfo.AddClause(new RSAKeyValue(rsaKey));
counterSignature.KeyInfo = keyInfo;
Cert cert = new Cert();
cert.IssuerSerial.X509IssuerName = certificateForCounterSignature.IssuerName.Name;
cert.IssuerSerial.X509SerialNumber = certificateForCounterSignature.SerialNumber;
cert.CertDigest.DigestMethod.Algorithm = SignedXml.XmlDsigSHA1Url;
cert.CertDigest.DigestValue = certificateForCounterSignature.GetCertHash();
counterSignature.Signature.Id = "CounterSignatureId";
XadesObject counterSignatureXadesObject = new XadesObject();
counterSignatureXadesObject.Id = "CounterSignatureXadesObjectId";
counterSignatureXadesObject.QualifyingProperties.Target = "#CounterSignatureId";
counterSignatureXadesObject.QualifyingProperties.SignedProperties.Id = "CounterSignatureSignedProperiesId";
Reference newReference = new Reference();
newReference.Uri = "#" + this.xadesSignedXml.SignatureValueId;
counterSignature.AddReference(newReference);
SignedSignatureProperties signedSignatureProperties = counterSignatureXadesObject.QualifyingProperties.SignedProperties.SignedSignatureProperties;
signedSignatureProperties.SigningCertificate.CertCollection.Add(cert);
signedSignatureProperties.SigningTime = DateTime.Parse(this.signingTimeTextBox.Text);
signedSignatureProperties.SignaturePolicyIdentifier.SignaturePolicyImplied = true;
counterSignature.AddXadesObject(counterSignatureXadesObject);
counterSignature.ComputeSignature();
UnsignedProperties unsignedProperties = this.xadesSignedXml.UnsignedProperties;
unsignedProperties.UnsignedSignatureProperties.CounterSignatureCollection.Add(counterSignature);
this.xadesSignedXml.UnsignedProperties = unsignedProperties;
this.ShowSignature();
}
}
private static XadesSignedXml CreateFromXmlDocument(XmlDocument envelopedSignatureXmlDocument)
{
XmlDsigEnvelopedSignatureTransform xmlDsigEnvelopedSignatureTransform;
Reference reference;
reference = new Reference();
var xadesSignedXml = new XadesSignedXml(envelopedSignatureXmlDocument);
reference.Uri = "";
reference.Id = "xml_ref_id";
//TODO jbonilla - Parameter?
//reference.DigestMethod = "http://www.w3.org/2001/04/xmlenc#sha256";
reference.DigestMethod = SignedXml.XmlDsigSHA1Url;
// ETSI TS 103 171 V2.1.1
// 6.2.4 Transforms within ds:Reference element
{
//XmlDsigC14NTransform xmlDsigC14NTransform = new XmlDsigC14NTransform();
//reference.AddTransform(xmlDsigC14NTransform);
xmlDsigEnvelopedSignatureTransform = new XmlDsigEnvelopedSignatureTransform();
reference.AddTransform(xmlDsigEnvelopedSignatureTransform);
//jbonilla - Para permitir multifirmas (co-firmas)
Dictionary<string, string> namespaces = new Dictionary<string, string>();
namespaces.Add("ds", "http://www.w3.org/2000/09/xmldsig#");
var xmlDsigXPathTransform = CreateXPathTransform("not(ancestor-or-self::ds:Signature)", namespaces);
reference.AddTransform(xmlDsigXPathTransform);
}
xadesSignedXml.AddReference(reference);
// ETSI TS 103 171 V2.1.1
// 6.2.2 Canonicalization of ds:SignedInfo element
xadesSignedXml.SignedInfo.CanonicalizationMethod = SignedXml.XmlDsigC14NTransformUrl;//"http://www.w3.org/2001/10/xml-exc-c14n#";
//xadesSignedXml.SignedInfo.SignatureMethod = "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256";
xadesSignedXml.SignedInfo.SignatureMethod = SignedXml.XmlDsigRSASHA1Url;
return xadesSignedXml;
}
