Assinatura de computação SignedXml com SHA256
Estou tentando assinar digitalmente um documento XML usando o SHA256.
Estou tentando usarSecurity.Cryptography.dll por esta.
Aqui está o meu código -
CryptoConfig.AddAlgorithm(typeof(RSAPKCS1SHA256SignatureDescription),"http://www.w3.org/2001/04/xmldsig-more#rsa-sha256");
X509Certificate2 cert = new X509Certificate2(@"location of pks file", "password");
XmlDocument doc = new XmlDocument();
doc.PreserveWhitespace = true;
doc.Load(@"input.xml");
SignedXml signedXml = new SignedXml(doc);
signedXml.SigningKey = cert.PrivateKey;
signedXml.SignedInfo.SignatureMethod = "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256";
//
// Add a signing reference, the uri is empty and so the whole document
// is signed.
Reference reference = new Reference();
reference.AddTransform(new XmlDsigEnvelopedSignatureTransform());
reference.AddTransform(new XmlDsigExcC14NTransform());
reference.Uri = "";
signedXml.AddReference(reference);
//
// Add the certificate as key info, because of this the certificate
// with the public key will be added in the signature part.
KeyInfo keyInfo = new KeyInfo();
keyInfo.AddClause(new KeyInfoX509Data(cert));
signedXml.KeyInfo = keyInfo;
// Generate the signature.
signedXml.ComputeSignature();
Mas estou recebendo "Algoritmo inválido especificado". erro emsignedXml.ComputeSignature();
. Alguém pode me dizer o que estou fazendo de errado?