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XmlDsigC14NWithCommentsTransform Class

Represents the C14N XML canonicalization transform for a digital signature as defined by the W3C, with comments.

For a list of all members of this type, see XmlDsigC14NWithCommentsTransform Members.

System.Object
   System.Security.Cryptography.Xml.Transform
      System.Security.Cryptography.Xml.XmlDsigC14NTransform
         System.Security.Cryptography.Xml.XmlDsigC14NWithCommentsTransform

[Visual Basic]
Public Class XmlDsigC14NWithCommentsTransform
   Inherits XmlDsigC14NTransform
[C#]
public class XmlDsigC14NWithCommentsTransform :
   XmlDsigC14NTransform
[C++]
public __gc class XmlDsigC14NWithCommentsTransform : public
   XmlDsigC14NTransform
[JScript]
public class XmlDsigC14NWithCommentsTransform extends
   XmlDsigC14NTransform

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Remarks

For more information about the C14N with comments transform, see Sections 6.5 and 6.6.1 of the XMLDSIG specification, which is available from the W3C at www.w3.org/TR/xmldsig-core/. The canonicalization algorithm itself is defined in the W3C Canonical XML specification, available at www.w3.org/TR/xml-c14n.

Example

[Visual Basic] 
' This example signs a file specified by a URI 
' using a detached signature. It then verifies  
' the signed XML.

Imports System
Imports System.Security.Cryptography
Imports System.Security.Cryptography.Xml
Imports System.Text
Imports System.Xml

Class XMLDSIGDetached

   
   <STAThread()>  _
   Overloads Shared Sub Main(args() As String)
      ' The URI to sign.
      Dim resourceToSign As String = "http://www.microsoft.com"
      
      ' The name of the file to which to save the XML signature.
      Dim XmlFileName As String = "xmldsig.xml"
      
      Try
         
         ' Generate a signing key.
         Dim Key As New RSACryptoServiceProvider()
         
         Console.WriteLine("Signing: {0}", resourceToSign)
         
         ' Sign the detached resourceand save the signature in an XML file.
         SignDetachedResource(resourceToSign, XmlFileName, Key)
         
         Console.WriteLine("XML signature was succesfully computed and saved to {0}.", XmlFileName)
         
         ' Verify the signature of the signed XML.
         Console.WriteLine("Verifying signature...")
         
         'Verify the XML signature in the XML file.
         Dim result As Boolean = VerifyDetachedSignature(XmlFileName)
         
         ' Display the results of the signature verification to 
         ' the console.
         If result Then
            Console.WriteLine("The XML signature is valid.")
         Else
            Console.WriteLine("The XML signature is not valid.")
         End If
      Catch e As CryptographicException
         Console.WriteLine(e.Message)
      End Try 
   End Sub 
   
   ' Sign an XML file and save the signature in a new file.
   Public Shared Sub SignDetachedResource(URIString As String, XmlSigFileName As String, Key As RSA)
      ' Create a SignedXml object.
      Dim signedXml As New SignedXml()
      
      ' Assign the key to the SignedXml object.
      signedXml.SigningKey = Key
      
      ' Create a reference to be signed.
      Dim reference As New Reference()
      
      ' Add the passed URI to the reference object.
      reference.Uri = URIString
      
      ' Add a transformation if the URI is an XML file.
      If URIString.EndsWith("xml") Then
         reference.AddTransform(New XmlDsigC14NWithCommentsTransform())
      End If
      
      ' Add the reference to the SignedXml object.
      signedXml.AddReference(reference)
      
      ' Add an RSAKeyValue KeyInfo (optional; helps recipient find key to validate).
      Dim keyInfo As New KeyInfo()
      keyInfo.AddClause(New RSAKeyValue(CType(Key, RSA)))
      signedXml.KeyInfo = keyInfo
      
      ' Compute the signature.
      signedXml.ComputeSignature()
      
      ' Get the XML representation of the signature and save
      ' it to an XmlElement object.
      Dim xmlDigitalSignature As XmlElement = signedXml.GetXml()
      
      ' Save the signed XML document to a file specified
      ' using the passed string.
      Dim xmltw As New XmlTextWriter(XmlSigFileName, New UTF8Encoding(False))
      xmlDigitalSignature.WriteTo(xmltw)
      xmltw.Close()
   End Sub 
   
   ' Verify the signature of an XML file and return the result.
   Public Shared Function VerifyDetachedSignature(XmlSigFileName As String) As [Boolean]
      ' Create a new XML document.
      Dim xmlDocument As New XmlDocument()
      
      ' Load the passed XML file into the document.
      xmlDocument.Load(XmlSigFileName)
      
      ' Create a new SignedXMl object.
      Dim signedXml As New SignedXml()
      
      ' Find the "Signature" node and create a new
      ' XmlNodeList object.
      Dim nodeList As XmlNodeList = xmlDocument.GetElementsByTagName("Signature")
      
      ' Load the signature node.
      signedXml.LoadXml(CType(nodeList(0), XmlElement))
      
      ' Check the signature and return the result.
      Return signedXml.CheckSignature()
   End Function 

[C#] 
//
// This example signs a file specified by a URI 
// using a detached signature. It then verifies  
// the signed XML.
//

using System;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
using System.Text;
using System.Xml;



class XMLDSIGDetached
{
    
    [STAThread]
    static void Main(string[] args)
    {
        // The URI to sign.
        string resourceToSign = "http://www.microsoft.com";
        
        // The name of the file to which to save the XML signature.
        string XmlFileName = "xmldsig.xml";

        try
        {

            // Generate a signing key.
            RSACryptoServiceProvider Key = new RSACryptoServiceProvider();

            Console.WriteLine("Signing: {0}", resourceToSign);

            // Sign the detached resourceand save the signature in an XML file.
            SignDetachedResource(resourceToSign, XmlFileName, Key);

            Console.WriteLine("XML signature was succesfully computed and saved to {0}.", XmlFileName);

            // Verify the signature of the signed XML.
            Console.WriteLine("Verifying signature...");

            //Verify the XML signature in the XML file.
            bool result = VerifyDetachedSignature(XmlFileName);

            // Display the results of the signature verification to 
            // the console.
            if(result)
            {
                Console.WriteLine("The XML signature is valid.");
            }
            else
            {
                Console.WriteLine("The XML signature is not valid.");
            }
        }
        catch(CryptographicException e)
        {
            Console.WriteLine(e.Message);

        }
        
    }

    // Sign an XML file and save the signature in a new file.
    public static void SignDetachedResource(string URIString, string XmlSigFileName, RSA Key)
    {
        // Create a SignedXml object.
        SignedXml signedXml = new SignedXml();

        // Assign the key to the SignedXml object.
        signedXml.SigningKey = Key;

        // Create a reference to be signed.
        Reference reference = new Reference();

        // Add the passed URI to the reference object.
        reference.Uri = URIString;

        // Add a transformation if the URI is an XML file.
        if (URIString.EndsWith("xml")) 
        {
            reference.AddTransform(new XmlDsigC14NWithCommentsTransform());
        }
        
        // Add the reference to the SignedXml object.
        signedXml.AddReference(reference);

        // Add an RSAKeyValue KeyInfo (optional; helps recipient find key to validate).
        KeyInfo keyInfo = new KeyInfo();
        keyInfo.AddClause(new RSAKeyValue((RSA)Key));    
        signedXml.KeyInfo = keyInfo;

        // Compute the signature.
        signedXml.ComputeSignature();

        // Get the XML representation of the signature and save
        // it to an XmlElement object.
        XmlElement xmlDigitalSignature = signedXml.GetXml();

        // Save the signed XML document to a file specified
        // using the passed string.
        XmlTextWriter xmltw = new XmlTextWriter(XmlSigFileName, new UTF8Encoding(false));
        xmlDigitalSignature.WriteTo(xmltw);
        xmltw.Close();
    }
    // Verify the signature of an XML file and return the result.
    public static Boolean VerifyDetachedSignature(string XmlSigFileName)
    {    
        // Create a new XML document.
        XmlDocument xmlDocument = new XmlDocument();

        // Load the passed XML file into the document.
        xmlDocument.Load(XmlSigFileName);
    
        // Create a new SignedXMl object.
        SignedXml signedXml = new SignedXml();

        // Find the "Signature" node and create a new
        // XmlNodeList object.
        XmlNodeList nodeList = xmlDocument.GetElementsByTagName("Signature");

        // Load the signature node.
        signedXml.LoadXml((XmlElement)nodeList[0]);

        // Check the signature and return the result.
        return signedXml.CheckSignature();
    }
}

[C++] 
//
// This example signs a file specified by a URI 
// using a detached signature. It then verifies  
// the signed XML.
//

#using <mscorlib.dll>
#using <System.Security.dll>
#using <System.Xml.dll>

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Security::Cryptography::Xml;
using namespace System::Text;
using namespace System::Xml;





// Sign an XML file and save the signature in a new file.
void SignDetachedResource(String* URIString, String* XmlSigFileName, RSA* RSAKey) {
    // Create a SignedXml Object*.
    SignedXml* signedXml = new SignedXml();

    // Assign the key to the SignedXml Object*.
    signedXml->SigningKey = RSAKey;

    // Create a reference to be signed.
    Reference* reference = new Reference();

    // Add the passed URI to the reference Object*.
    reference->Uri = URIString;

    // Add a transformation if the URI is an XML file.
    if (URIString->EndsWith(S"xml")) {
        reference->AddTransform(new XmlDsigC14NTransform());

        // Add the reference to the SignedXml Object*.
        signedXml->AddReference(reference);

        // Add an RSAKeyValue KeyInfo (optional; helps recipient find key to validate).
        KeyInfo* keyInfo = new KeyInfo(); 
        keyInfo->AddClause(new RSAKeyValue(__try_cast<RSA*> (RSAKey))); 
        signedXml->KeyInfo = keyInfo;

        // Compute the signature.
        signedXml->ComputeSignature();

        // Get the XML representation of the signature and save
        // it to an XmlElement Object*.
        XmlElement* xmlDigitalSignature = signedXml->GetXml();

        // Save the signed XML document to a file specified
        // using the passed String*.
        XmlTextWriter* xmltw = new XmlTextWriter(XmlSigFileName, new UTF8Encoding(false));
        xmlDigitalSignature->WriteTo(xmltw);
        xmltw->Close();
    }
}
// Verify the signature of an XML file and return the result.
Boolean VerifyDetachedSignature(String* XmlSigFileName) {    
    // Create a new XML document.
    XmlDocument* xmlDocument = new XmlDocument();

    // Load the passed XML file into the document.
    xmlDocument->Load(XmlSigFileName);

    // Create a new SignedXMl Object*.
    SignedXml* signedXml = new SignedXml();

    // Find the S"Signature" node and create a new
    // XmlNodeList Object*.
    XmlNodeList* nodeList = xmlDocument->GetElementsByTagName(S"Signature");

    // Load the signature node.
    signedXml->LoadXml(__try_cast<XmlElement*>( nodeList->Item(0) ));

    // Check the signature and return the result.
    return signedXml->CheckSignature();
}

    void main() {
        String* args[] = Environment::GetCommandLineArgs();
        // The URI to sign.
        String* resourceToSign = S"http://www.microsoft.com";

        // The name of the file to which to save the XML signature.
        String* XmlFileName = S"xmldsig.xml";

        try {

            // Generate a signing key.
            RSACryptoServiceProvider* Key = new RSACryptoServiceProvider();

            Console::WriteLine(S"Signing: {0}", resourceToSign);

            // Sign the detached resourceand save the signature in an XML file.
            SignDetachedResource(resourceToSign, XmlFileName, Key);

            Console::WriteLine(S"XML signature was succesfully computed and saved to {0}.", XmlFileName);

            // Verify the signature of the signed XML.
            Console::WriteLine(S"Verifying signature...");

            //Verify the XML signature in the XML file.
            bool result = VerifyDetachedSignature(XmlFileName);

            // Display the results of the signature verification to 
            // the console.
            if (result) {
                Console::WriteLine(S"The XML signature is valid.");
            } else {
                Console::WriteLine(S"The XML signature is not valid.");
            }
        } catch (CryptographicException* e) {
            Console::WriteLine(e->Message);

        }
    }


[Visual Basic] 
' This example signs an XML file using an
' envelope signature. It then verifies the 
' signed XML.
Imports System
Imports System.Security.Cryptography
Imports System.Security.Cryptography.Xml
Imports System.Text
Imports System.Xml


Public Class SignVerifyEnvelope

   Overloads Public Shared Sub Main(args() As [String])
      Try
         ' Generate a signing key.
         Dim Key As New RSACryptoServiceProvider()
         
         ' Create an XML file to sign.
         CreateSomeXml("Example.xml")
         Console.WriteLine("New XML file created.")
         
         ' Sign the XML that was just created and save it in a 
         ' new file.
         SignXmlFile("Example.xml", "SignedExample.xml", Key)
         Console.WriteLine("XML file signed.")
         
         ' Verify the signature of the signed XML.
         Console.WriteLine("Verifying signature...")
         Dim result As Boolean = VerifyXmlFile("SignedExample.xml")
         
         ' Display the results of the signature verification to \
         ' the console.
         If result Then
            Console.WriteLine("The XML signature is valid.")
         Else
            Console.WriteLine("The XML signature is not valid.")
         End If
      Catch e As CryptographicException
         Console.WriteLine(e.Message)
      End Try
   End Sub 
   
   
   ' Sign an XML file and save the signature in a new file.
   Public Shared Sub SignXmlFile(FileName As String, SignedFileName As String, Key As RSA)
      ' Create a new XML document.
      Dim doc As New XmlDocument()
      
      ' Format the document to ignore white spaces.
      doc.PreserveWhitespace = False
      
      ' Load the passed XML file using it's name.
      doc.Load(New XmlTextReader(FileName))
      
      ' Create a SignedXml object.
      Dim signedXml As New SignedXml(doc)
      
      ' Add the key to the SignedXml document. 
      signedXml.SigningKey = Key
      
      ' Create a reference to be signed.
      Dim reference As New Reference()
      reference.Uri = ""
      
      ' Add a transformation to the reference.
      Dim trns = New XmlDsigC14NWithCommentsTransform()
      reference.AddTransform(trns)
      
      ' Add an enveloped transformation to the reference.
      Dim env As New XmlDsigEnvelopedSignatureTransform()
      reference.AddTransform(env)
      
      ' Add the reference to the SignedXml object.
      signedXml.AddReference(reference)
      
      
      ' Add an RSAKeyValue KeyInfo (optional; helps recipient find key to validate).
      Dim keyInfo As New KeyInfo()
      keyInfo.AddClause(New RSAKeyValue(CType(Key, RSA)))
      signedXml.KeyInfo = keyInfo
      
      ' Compute the signature.
      signedXml.ComputeSignature()
      
      ' Get the XML representation of the signature and save
      ' it to an XmlElement object.
      Dim xmlDigitalSignature As XmlElement = signedXml.GetXml()
      
      ' Append the element to the XML document.
      doc.DocumentElement.AppendChild(doc.ImportNode(xmlDigitalSignature, True))
      
      
      If TypeOf doc.FirstChild Is XmlDeclaration Then
         doc.RemoveChild(doc.FirstChild)
      End If
      
      ' Save the signed XML document to a file specified
      ' using the passed string.
      Dim xmltw As New XmlTextWriter(SignedFileName, New UTF8Encoding(False))
      doc.WriteTo(xmltw)
      xmltw.Close()
   End Sub 
   
   ' Verify the signature of an XML file and return the result.
   Public Shared Function VerifyXmlFile(Name As [String]) As [Boolean]
      ' Create a new XML document.
      Dim xmlDocument As New XmlDocument()
      
      ' Format using white spaces.
      xmlDocument.PreserveWhitespace = True
      
      ' Load the passed XML file into the document. 
      xmlDocument.Load(Name)
      
      ' Create a new SignedXml object and pass it
      ' the XML document class.
      Dim signedXml As New SignedXml(xmlDocument)
      
      ' Find the "Signature" node and create a new
      ' XmlNodeList object.
      Dim nodeList As XmlNodeList = xmlDocument.GetElementsByTagName("Signature")
      
      ' Load the signature node.
      signedXml.LoadXml(CType(nodeList(0), XmlElement))
      
      ' Check the signature and return the result.
      Return signedXml.CheckSignature()
   End Function 
   
   ' Create example data to sign.
   Public Shared Sub CreateSomeXml(FileName As String)
      ' Create a new XmlDocument object.
      Dim document As New XmlDocument()
      
      ' Create a new XmlNode object.
      Dim node As XmlNode = document.CreateNode(XmlNodeType.Element, "", "MyElement", "samples")
      
      ' Add some text to the node.
      node.InnerText = "Example text to be signed."
      
      ' Append the node to the document.
      document.AppendChild(node)
      
      ' Save the XML document to the file name specified.
      Dim xmltw As New XmlTextWriter(FileName, New UTF8Encoding(False))
      document.WriteTo(xmltw)
      xmltw.Close()
   End Sub 
End Class 

[C#] 
// This example signs an XML file using an
// envelope signature. It then verifies the 
// signed XML.

using System;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
using System.Text;
using System.Xml;

public class SignVerifyEnvelope
{

    public static void Main(String[] args)
    {
        try
        {
            // Generate a signing key.
            RSACryptoServiceProvider Key = new RSACryptoServiceProvider();

            // Create an XML file to sign.
            CreateSomeXml("Example.xml");
            Console.WriteLine("New XML file created."); 

            // Sign the XML that was just created and save it in a 
            // new file.
            SignXmlFile("Example.xml", "SignedExample.xml", Key);
            Console.WriteLine("XML file signed."); 

            // Verify the signature of the signed XML.
            Console.WriteLine("Verifying signature...");
            bool result = VerifyXmlFile("SignedExample.xml");

            // Display the results of the signature verification to \
            // the console.
            if(result)
            {
                Console.WriteLine("The XML signature is valid.");
            }
            else
            {
                Console.WriteLine("The XML signature is not valid.");
            }
        }
        catch(CryptographicException e)
        {
            Console.WriteLine(e.Message);
        }
    }

    // Sign an XML file and save the signature in a new file.
    public static void SignXmlFile(string FileName, string SignedFileName, RSA Key)
    {
        // Create a new XML document.
        XmlDocument doc = new XmlDocument();

        // Format the document to ignore white spaces.
        doc.PreserveWhitespace = false;

        // Load the passed XML file using it's name.
        doc.Load(new XmlTextReader(FileName));

        // Create a SignedXml object.
        SignedXml signedXml = new SignedXml(doc);

        // Add the key to the SignedXml document. 
        signedXml.SigningKey = Key;

        // Create a reference to be signed.
        Reference reference = new Reference();
        reference.Uri = "";

        // Add a transformation to the reference.
        Transform trns = new XmlDsigC14NWithCommentsTransform();
        reference.AddTransform(trns);

        // Add an enveloped transformation to the reference.
        XmlDsigEnvelopedSignatureTransform env = new XmlDsigEnvelopedSignatureTransform();
        reference.AddTransform(env);

        // Add the reference to the SignedXml object.
        signedXml.AddReference(reference);

        
        // Add an RSAKeyValue KeyInfo (optional; helps recipient find key to validate).
        KeyInfo keyInfo = new KeyInfo();
        keyInfo.AddClause(new RSAKeyValue((RSA)Key));
        signedXml.KeyInfo = keyInfo;

        // Compute the signature.
        signedXml.ComputeSignature();

        // Get the XML representation of the signature and save
        // it to an XmlElement object.
        XmlElement xmlDigitalSignature = signedXml.GetXml();

        // Append the element to the XML document.
        doc.DocumentElement.AppendChild(doc.ImportNode(xmlDigitalSignature, true));
        
        
        if (doc.FirstChild is XmlDeclaration)  
        {
            doc.RemoveChild(doc.FirstChild);
        }

        // Save the signed XML document to a file specified
        // using the passed string.
        XmlTextWriter xmltw = new XmlTextWriter(SignedFileName, new UTF8Encoding(false));
        doc.WriteTo(xmltw);
        xmltw.Close();
    }
    // Verify the signature of an XML file and return the result.
    public static Boolean VerifyXmlFile(String Name)
    {
        // Create a new XML document.
        XmlDocument xmlDocument = new XmlDocument();

        // Format using white spaces.
        xmlDocument.PreserveWhitespace = true;

        // Load the passed XML file into the document. 
        xmlDocument.Load(Name);

        // Create a new SignedXml object and pass it
        // the XML document class.
        SignedXml signedXml = new SignedXml(xmlDocument);

        // Find the "Signature" node and create a new
        // XmlNodeList object.
        XmlNodeList nodeList = xmlDocument.GetElementsByTagName("Signature");

        // Load the signature node.
        signedXml.LoadXml((XmlElement)nodeList[0]);

        // Check the signature and return the result.
        return signedXml.CheckSignature();
    }

    // Create example data to sign.
    public static void CreateSomeXml(string FileName)
    {
        // Create a new XmlDocument object.
        XmlDocument document = new XmlDocument();

        // Create a new XmlNode object.
        XmlNode  node = document.CreateNode(XmlNodeType.Element, "", "MyElement", "samples");
        
        // Add some text to the node.
        node.InnerText = "Example text to be signed.";

        // Append the node to the document.
        document.AppendChild(node);

        // Save the XML document to the file name specified.
        XmlTextWriter xmltw = new XmlTextWriter(FileName, new UTF8Encoding(false));
        document.WriteTo(xmltw);
        xmltw.Close();
    }
}

[C++] 
// This example signs an XML file using an
// envelope signature. It then verifies the 
// signed XML.


#using <mscorlib.dll>
#using <System.Security.dll>
#using <System.Xml.dll>

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Security::Cryptography::Xml;
using namespace System::Text;
using namespace System::Xml;



// Sign an XML file and save the signature in a new file.
void SignXmlFile(String* FileName, String* SignedFileName, RSA* Key) {
    // Create a new XML document.
    XmlDocument* doc = new XmlDocument();

    // Format the document to ignore white spaces.
    doc->PreserveWhitespace = false;

    // Load the passed XML file using it's name.
    doc->Load(new XmlTextReader(FileName));

    // Create a SignedXml Object*.
    SignedXml* signedXml = new SignedXml(doc);

    // Add the key to the SignedXml document. 
    signedXml->SigningKey = Key;

    // Create a reference to be signed.
    Reference* reference = new Reference();
    reference->Uri = S"";

    // Add a transformation to the reference.
    Transform* trns = new XmlDsigC14NWithCommentsTransform();
    reference->AddTransform(trns);

    // Add an enveloped transformation to the reference.
    XmlDsigEnvelopedSignatureTransform* env = new XmlDsigEnvelopedSignatureTransform();
    reference->AddTransform(env);

    // Add the reference to the SignedXml Object*.
    signedXml->AddReference(reference);


    // Add an RSAKeyValue KeyInfo (optional; helps recipient find key to validate).
    KeyInfo* keyInfo = new KeyInfo();
    keyInfo->AddClause(new RSAKeyValue(__try_cast<RSA*> (Key))); 
    signedXml->KeyInfo = keyInfo;

    // Compute the signature.
    signedXml->ComputeSignature();

    // Get the XML representation of the signature and save
    // it to an XmlElement Object*.
    XmlElement* xmlDigitalSignature = signedXml->GetXml();

    // Append the element to the XML document.
    doc->DocumentElement->AppendChild(doc->ImportNode(xmlDigitalSignature, true));

    if ((doc->FirstChild)->GetType() == __typeof(XmlDeclaration) ) 
    {
        doc->RemoveChild(doc->FirstChild);
    }

    // Save the signed XML document to a file specified
    // using the passed String*.
    XmlTextWriter* xmltw = new XmlTextWriter(SignedFileName, new UTF8Encoding(false));
    doc->WriteTo(xmltw);
    xmltw->Close();
}

// Verify the signature of an XML file and return the result.
Boolean VerifyXmlFile(String* Name) {
    // Create a new XML document.
    XmlDocument* xmlDocument = new XmlDocument();

    // Format using white spaces.
    xmlDocument->PreserveWhitespace = true;

    // Load the passed XML file into the document. 
    xmlDocument->Load(Name);

    // Create a new SignedXml Object* and pass it
    // the XML document class.
    SignedXml* signedXml = new SignedXml(xmlDocument);

    // Find the S"Signature" node and create a new
    // XmlNodeList Object*.
    XmlNodeList* nodeList = xmlDocument->GetElementsByTagName(S"Signature");

    // Load the signature node.
    signedXml->LoadXml(__try_cast<XmlElement*>( nodeList->Item(0) ));

    // Check the signature and return the result.
    return signedXml->CheckSignature();
}


// Create example data to sign.
void CreateSomeXml(String* FileName) {
    // Create a new XmlDocument Object*.
    XmlDocument* document = new XmlDocument();

    // Create a new XmlNode Object*.
    XmlNode*  node = document->CreateNode(XmlNodeType::Element, S"", S"MyElement", S"samples");

    // Add some text to the node.
    node->InnerText = S"Example text to be signed.";

    // Append the node to the document.
    document->AppendChild(node);

    // Save the XML document to the file name specified.
    XmlTextWriter* xmltw = new XmlTextWriter(FileName, new UTF8Encoding(false));
    document->WriteTo(xmltw);
    xmltw->Close();
}

void main() {
    try {
        // Generate a signing key.
        RSACryptoServiceProvider* Key = new RSACryptoServiceProvider();

        // Create an XML file to sign.
        CreateSomeXml(S"Example.xml");
        Console::WriteLine(S"New XML file created."); 

        // Sign the XML that was just created and save it in a 
        // new file.
        SignXmlFile(S"Example.xml", S"SignedExample.xml", Key);
        Console::WriteLine(S"XML file signed."); 

        // Verify the signature of the signed XML.
        Console::WriteLine(S"Verifying signature...");
        bool result = VerifyXmlFile(S"SignedExample.xml");

        // Display the results of the signature verification to
        // the console.
        if (result) {
            Console::WriteLine(S"The XML signature is valid.");
        } else {
            Console::WriteLine(S"The XML signature is not valid.");
        }
    } catch (CryptographicException* e) {
        Console::WriteLine(e->Message);
    }
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Security.Cryptography.Xml

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Assembly: System.Security (in System.Security.dll)

See Also

XmlDsigC14NWithCommentsTransform Members | System.Security.Cryptography.Xml Namespace

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