Código: Selecionar todos
class Assinatura
{
public string AssinarSHA256(Int32 lnEvento,
string arqXMLAssinar,
string tagAssinatura,
string tagAtributoId,
X509Certificate2 x509Cert,
string lxURI)
{
try
{
string xmlString;
xmlString = arqXMLAssinar;
XmlDocument doc = new XmlDocument();
// Format the document to ignore white spaces.
doc.PreserveWhitespace = false;
doc.LoadXml(xmlString);
XmlElement xmlDigitalSignature = null;
// Load the passed XML file using it’s name.
if (doc.GetElementsByTagName(tagAssinatura).Count == 0)
{
throw new Exception("A tag de assinatura " + tagAssinatura.Trim() + " não existe no XML. (Código do Erro: 5)");
}
else if (doc.GetElementsByTagName(tagAtributoId).Count == 0)
{
throw new Exception("A tag de assinatura " + tagAtributoId.Trim() + " não existe no XML. (Código do Erro: 4)");
}
// Existe mais de uma tag a ser assinada
else
{
XmlNodeList lists = doc.GetElementsByTagName(tagAssinatura);
if (lists.Count != 1)
{
MessageBox.Show("Existe mais de uma TAG definida como tag da assinatura");
throw new Exception("Existe mais de uma tag de assinatura " + tagAtributoId.Trim() + " não existe no XML. (Código do Erro: 6)");
}
#region
foreach (XmlNode nodes in lists)
{
foreach (XmlNode childNodes in nodes.ChildNodes)
{
if (!childNodes.Name.Equals(tagAtributoId))
continue;
// Create a reference to be signed
Reference reference = new Reference();
reference.Uri = lxURI;
// Create a SignedXml object.
SignedXml signedXml = new SignedXml(doc);
signedXml.SigningKey = x509Cert.GetRSAPrivateKey();
signedXml.SignedInfo.SignatureMethod = "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256";
// Add an enveloped transformation to the reference.
XmlDsigEnvelopedSignatureTransform env = new XmlDsigEnvelopedSignatureTransform();
reference.AddTransform(env);
XmlDsigC14NTransform c14 = new XmlDsigC14NTransform();
reference.AddTransform(c14);
reference.DigestMethod = "http://www.w3.org/2001/04/xmlenc#sha256";
// Add the reference to the SignedXml object.
signedXml.AddReference(reference);
// Create a new KeyInfo object
KeyInfo keyInfo = new KeyInfo();
// Load the certificate into a KeyInfoX509Data object
// and add it to the KeyInfo object.
keyInfo.AddClause(new KeyInfoX509Data(x509Cert));
// Add the KeyInfo object to the SignedXml object.
signedXml.KeyInfo = keyInfo;
signedXml.ComputeSignature();
// Get the XML representation of the signature and save
// it to an XmlElement object.
xmlDigitalSignature = signedXml.GetXml();
// Gravar o elemento no documento XML
nodes.AppendChild(doc.ImportNode(xmlDigitalSignature, true));
}
}
#endregion
// Atualizar a string do XML já assinada
return doc.OuterXml;
}
}
catch (System.Security.Cryptography.CryptographicException ex)
{
throw new Exception("Mensagem:" + ex.Message + "\n" +
"Trace:" + ex.StackTrace + "\n" +
"Dados" + ex.Data + "\n" +
ex.ToString());// #12342 concatenar com a mensagem original
}
finally
{
}
}
}
