/// <summary>
/// <p><strong>Purpose:</strong></p> <p>This method processes the references and creates the digital signature
/// of the contents, and returns the whole XML Node of the signed contents. It produces an XmlNode
/// of type signature.</p>
/// <p>Note: Current implementation does not create a KeyInfoNode</p>
/// </summary>
/// <param name="references">references that we will be signing</param>
/// <param name="canonicalizer">the specific canonicalizer to use</param>
/// <param name="signer">the specific signer to use</param>
/// <param name="signID">Signature id</param>
/// <returns>Xml Node with digitally signed representation of the data</returns>
/// <exception cref="ArgumentNullException">if any element is null</exception>
/// <exception cref="SignatureManagerException">any internal exception thrown in this function
/// is wrapped up as SignatureManagerException</exception>
public XmlNode Sign(IList <IReference> references, InstantiationVO canonicalizer, InstantiationVO signer,
string signID)
{
//Validate not null
ExceptionHelper.ValidateNotNull(references, "references");
ExceptionHelper.ValidateNotNull(canonicalizer, "canonicalizer");
ExceptionHelper.ValidateNotNull(signer, "signer");
ExceptionHelper.ValidateNotNull(signID, "signID");
XmlDocument doc = new XmlDocument();
try
{
//Create Signature node
XmlNode signatureNode = doc.CreateNode(XmlNodeType.Element, "Signature", null);
//Create SignedInfo Node
XmlNode signedInfoNode = CreateSignedInfoNode(doc, canonicalizer, signer, references);
//Add an attribute representing default namespace to SignedInfo node
//since the two have the exact literal format
((XmlElement)signedInfoNode).SetAttribute("xmlns", DEF_XMLDSIG_NS);
//Get Canonicalizer and canonicalize
ICanonicalizer canonInst = registry.GetCanonicalizerInstance(canonicalizer.Key,
canonicalizer.Params);
string canonicalized = canonInst.BringToCanonicalForm(signedInfoNode.OuterXml);
//Add SignedInfo node to Signature node
signatureNode.InnerXml += canonicalized;
//Get Signer Instance, sign, assign to signatureValue node
ISigner signerInst = registry.GetSignerInstance(signer.Key, signer.Params);
string signed = signerInst.Sign(Encoding.UTF8.GetBytes(canonicalized));
XmlNode signValueNode = CreateSignatureValue(doc, signed);
//Append signatureValue to Signature node
signatureNode.InnerXml += signValueNode.OuterXml;
//Add an attribute representing default namespace to Signature node
XmlAttribute defNs = doc.CreateAttribute("xmlns");
defNs.Value = DEF_XMLDSIG_NS;
signatureNode.Attributes.Append(defNs);
//Add Id attribute to Signature node
XmlAttribute idAttr = doc.CreateAttribute("Id");
idAttr.Value = signID;
signatureNode.Attributes.Append(idAttr);
//Let default namespace takes effect
doc.LoadXml(signatureNode.OuterXml);
return(doc.DocumentElement);
}
catch (Exception ex)
{
throw new SignatureManagerException(SIGN_MAN_EXCP_MSG, ex);
}
}
public void TestGetCanonicalizerInstance()
{
ICanonicalizer canonc = pr.GetCanonicalizerInstance("http://www.w3.org/TR/2001/REC-xml-c14n-20010315",
emptyDic);
Assert.IsNotNull(canonc, "Canonicalizer instance is null");
Assert.IsTrue(canonc is Canonicalizers.StandardFormCanonicalizer,
"Canonicalizer has incorect type");
}