DataObject Class
Assembly: System.Security (in system.security.dll)
Use the DataObject class to store information or metadata directly in an XML signature. For example, you can store the signature generation date or the signer's identity. The DataObject class may or may not be covered by the XML signature.
The class corresponds to the <Object> element in the World Wide Web Consortium (W3C) specification for XML Signatures. For more information about the W3C specification, see http://www.w3.org/TR/xmldsig-core/.
The following code example demonstrates how to generate an enveloping XML signature.
Imports System Imports System.IO Imports System.Security.Cryptography Imports System.Security.Cryptography.Xml Imports System.Xml _ Public Class XMLdsigsample1 Shared Sub Main(args() As [String]) ' Create example data to sign. Dim document As New XmlDocument() Dim node As XmlNode = document.CreateNode(XmlNodeType.Element, "", "MyElement", "samples") node.InnerText = "This is some text" document.AppendChild(node) Console.Error.WriteLine("Data to sign:") Console.Error.WriteLine() Console.Error.WriteLine(document.OuterXml) Console.Error.WriteLine() ' Create the SignedXml message. Dim signedXml As New SignedXml() Dim key As RSA = RSA.Create() signedXml.SigningKey = key ' Create a data object to hold the data to sign. Dim dataObject As New DataObject() dataObject.Data = document.ChildNodes dataObject.Id = "MyObjectId" ' Add the data object to the signature. signedXml.AddObject(dataObject) ' Create a reference to be able to package everything into the ' message. Dim reference As New Reference() reference.Uri = "#MyObjectId" ' Add it to the message. signedXml.AddReference(reference) ' Add a KeyInfo. Dim keyInfo As New KeyInfo() keyInfo.AddClause(New RSAKeyValue(key)) signedXml.KeyInfo = keyInfo ' Compute the signature. signedXml.ComputeSignature() ' Get the XML representation of the signature. Dim xmlSignature As XmlElement = signedXml.GetXml() Console.WriteLine(xmlSignature.OuterXml) End Sub 'Main End Class 'XMLdsigsample1
import System.*;
import System.IO.*;
import System.Security.Cryptography.*;
import System.Security.Cryptography.Xml.*;
import System.Xml.*;
public class XmlDsigSample1
{
public static void main(String[] args)
{
// Create example data to sign.
XmlDocument document = new XmlDocument();
XmlNode node = document.CreateNode(XmlNodeType.Element, "",
"MyElement", "samples");
node.set_InnerText("This is some text");
document.AppendChild(node);
Console.get_Error().WriteLine("Data to sign:\n" +
document.get_OuterXml() + "\n");
// Create the SignedXml message.
SignedXml signedXml = new SignedXml();
RSA key = RSA.Create();
signedXml.set_SigningKey(key);
// Create a data object to hold the data to sign.
DataObject dataObject = new DataObject();
dataObject.set_Data(document.get_ChildNodes());
dataObject.set_Id("MyObjectId");
// Add the data object to the signature.
signedXml.AddObject(dataObject);
// Create a reference to be able to
Reference reference = new Reference();
reference.set_Uri("#MyObjectId");
// Add it to the message.
signedXml.AddReference(reference);
// Add a KeyInfo.
KeyInfo keyInfo = new KeyInfo();
keyInfo.AddClause(new RSAKeyValue(key));
signedXml.set_KeyInfo(keyInfo);
// Compute the signature.
signedXml.ComputeSignature();
// Get the XML representation of the signature.
XmlElement xmlSignature = signedXml.GetXml();
Console.WriteLine(xmlSignature.get_OuterXml());
} //main
} //XmlDsigSample1
The following code example demonstrates how to check an XML signature.
Imports System Imports System.Security.Cryptography Imports System.Security.Cryptography.Xml Imports System.IO Imports System.Xml _ Public Class Verify Public Shared Sub Main(args() As [String]) Console.WriteLine(("Verifying " + args(0) + "...")) ' Create a SignedXml. Dim signedXml As New SignedXml() ' Load the XML. Dim xmlDocument As New XmlDocument() xmlDocument.PreserveWhitespace = True xmlDocument.Load(New XmlTextReader(args(0))) Dim nodeList As XmlNodeList = xmlDocument.GetElementsByTagName("Signature") signedXml.LoadXml(CType(nodeList(0), XmlElement)) If signedXml.CheckSignature() Then Console.WriteLine("Signature check OK") Else Console.WriteLine("Signature check FAILED") End If End Sub 'Main End Class 'Verify
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.