SignedXml.CheckSignatureReturningKey(AsymmetricAlgorithm) SignedXml.CheckSignatureReturningKey(AsymmetricAlgorithm) SignedXml.CheckSignatureReturningKey(AsymmetricAlgorithm) SignedXml.CheckSignatureReturningKey(AsymmetricAlgorithm) Method

Definition

Bestimmt, ob die Signature-Eigenschaft mithilfe des öffentlichen Schlüssels in der Signatur überprüft wird.Determines whether the Signature property verifies using the public key in the signature.

public:
 bool CheckSignatureReturningKey([Runtime::InteropServices::Out] System::Security::Cryptography::AsymmetricAlgorithm ^ % signingKey);
public bool CheckSignatureReturningKey (out System.Security.Cryptography.AsymmetricAlgorithm signingKey);
member this.CheckSignatureReturningKey :  -> bool
Public Function CheckSignatureReturningKey (ByRef signingKey As AsymmetricAlgorithm) As Boolean

Parameter

signingKey
AsymmetricAlgorithm AsymmetricAlgorithm AsymmetricAlgorithm AsymmetricAlgorithm

Enthält bei Beenden dieser Methode die Implementierung der AsymmetricAlgorithm-Klasse, die den öffentlichen Schlüssel in der Signatur enthält.When this method returns, contains the implementation of AsymmetricAlgorithm that holds the public key in the signature. Dieser Parameter wird nicht initialisiert übergeben.This parameter is passed uninitialized.

Gibt zurück

true, wenn die Signature-Eigenschaft unter Verwendung des öffentlichen Schlüssels in der Signatur überprüft wird, andernfalls false.true if the Signature property verifies using the public key in the signature; otherwise, false.

Ausnahmen

Der signingKey-Parameter ist null.The signingKey parameter is null.

Die SignatureAlgorithm-Eigenschaft des öffentlichen Schlüssels in der Signatur entspricht nicht der SignatureMethod-Eigenschaft.The SignatureAlgorithm property of the public key in the signature does not match the SignatureMethod property.

- oder --or- Die Signaturbeschreibung konnte nicht erstellt werden.The signature description could not be created.

– oder –-or Der Hashalgorithmus konnte nicht erstellt werden.The hash algorithm could not be created.

Beispiele

Das folgende Codebeispiel veranschaulicht das zum Signieren und überprüfen mithilfe einer getrennten Signatur ein adressierbaren Uniform Resource Identifier (URI)-Objekt.The following code example shows how to sign and verify a Uniform Resource Identifier (URI) addressable object using a detached signature.

//
// This example signs a file specified by a URI 
// using a detached signature. It then verifies  
// the signed XML.
//
#using <System.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::Net;
using namespace System::IO;
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, DSA^ DSAKey )
{

	// Create a SignedXml Object*.
	SignedXml^ signedXml = gcnew SignedXml;

	// Assign the DSA key to the SignedXml object.
	signedXml->SigningKey = DSAKey;

	// Create a reference to be signed.
	Reference^ reference = gcnew Reference;

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

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

	// Add a DSAKeyValue to the KeyInfo (optional; helps recipient find key to validate).
	KeyInfo^ keyInfo = gcnew KeyInfo;
	keyInfo->AddClause( gcnew DSAKeyValue( safe_cast<DSA^>(DSAKey) ) );
	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 = gcnew XmlTextWriter( XmlSigFileName,gcnew 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 = gcnew XmlDocument;

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

	// Create a new SignedXMl object.
	SignedXml^ signedXml = gcnew SignedXml;

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

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

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


int main()
{
	// Create a request for the URL.   
	WebRequest^ request = WebRequest::Create( "http://www.contoso.com/default.html" );

	// If required by the server, set the credentials.
	request->Credentials = CredentialCache::DefaultCredentials;

	// Get the response.
	HttpWebResponse^ response = dynamic_cast<HttpWebResponse^>(request->GetResponse());

	// Display the status.
	Console::WriteLine( response->StatusDescription );

	// Get the stream containing content returned by the server.
	Stream^ dataStream = response->GetResponseStream();

	// Open the stream using a StreamReader for easy access.
	StreamReader^ reader = gcnew StreamReader( dataStream );

	// Read the content.
	String^ responseFromServer = reader->ReadToEnd();

	StreamWriter^ sw = File::CreateText( "C:\\temp\\mscom.htm" );
	sw->Write(responseFromServer);
	sw->Close();
	// The URI to sign.

	String^ resourceToSign = "file://C:/temp/mscom.htm";

	// The name of the file to which to save the XML signature.
	String^ XmlFileName = "xmldsig.xml";
	try
	{

		// Generate a DSA signing key.
		DSACryptoServiceProvider^ DSAKey = gcnew DSACryptoServiceProvider;
		Console::WriteLine( "Signing: {0}", resourceToSign );

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

}

//
// 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.IO;
using System.Net;
using System.Text;
using System.Xml;



class XMLDSIGDetached
{

    [STAThread]
    static void Main(string[] args)
    {
        WebRequest request = WebRequest.Create("http://www.microsoft.com");
        // If required by the server, set the credentials.
        //request.Credentials = CredentialCache.DefaultCredentials;
        // Get the response.
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        // Display the status.
        Console.WriteLine(response.StatusDescription);
        // Get the stream containing content returned by the server.
        Stream dataStream = response.GetResponseStream();
        // Open the stream using a StreamReader for easy access.
        StreamReader reader = new StreamReader(dataStream);
        // Read the content.
        string responseFromServer = reader.ReadToEnd();
        StreamWriter sw = File.CreateText("C:\\temp\\mscom.htm");
        sw.Write(responseFromServer);
        sw.Close();
        // Cleanup the streams and the response.
        reader.Close();
        dataStream.Close();
        response.Close();

        // The URI to sign.
        string resourceToSign = "file://C:/temp/mscom.htm";

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

        try
        {

            // Generate a DSA signing key.
            DSACryptoServiceProvider DSAKey = new DSACryptoServiceProvider();

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

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

            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, DSA DSAKey)
    {
        // Create a SignedXml object.
        SignedXml signedXml = new SignedXml();

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

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

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

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

        // Add a DSAKeyValue to the KeyInfo (optional; helps recipient find key to validate).
        KeyInfo keyInfo = new KeyInfo();
        keyInfo.AddClause(new DSAKeyValue((DSA)DSAKey));
        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();
    }
}
'
' 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.Net
Imports System.IO
Imports System.Text
Imports System.Xml


Class XMLDSIGDetached


    <STAThread()> _
    Overloads Shared Sub Main(ByVal args() As String)
        Dim request As WebRequest = WebRequest.Create("http://www.microsoft.com")
        ' If required by the server, set the credentials.
        request.Credentials = CredentialCache.DefaultCredentials
        ' Get the response.
        Dim response As HttpWebResponse = CType(request.GetResponse(), HttpWebResponse)
        ' Display the status.
        Console.WriteLine(response.StatusDescription)
        ' Get the stream containing content returned by the server.
        Dim dataStream As Stream = response.GetResponseStream()
        ' Open the stream using a StreamReader for easy access.
        Dim reader As New StreamReader(dataStream)
        ' Read the content.
        Dim responseFromServer As String = reader.ReadToEnd()
        Dim sw As StreamWriter = File.CreateText("C:\\temp\\mscom.htm")
        sw.Write(responseFromServer)
        sw.Close()

        ' Cleanup the streams and the response.
        reader.Close()
        dataStream.Close()
        response.Close()

        ' The URI to sign.
        Dim resourceToSign As String = "file://C:/temp/mscom.htm"

        ' The name of the file to which to save the XML signature.
        Dim XmlFileName As String = "xmldsig.xml"

        Try

            ' Generate a DSA signing key.
            Dim DSAKey As New DSACryptoServiceProvider()

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

            ' Sign the detached resourceand save the signature in an XML file.
            SignDetachedResource(resourceToSign, XmlFileName, DSAKey)

            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(ByVal URIString As String, ByVal XmlSigFileName As String, ByVal DSAKey As DSA)
        ' Create a SignedXml object.
        Dim signedXml As New SignedXml()

        ' Assign the DSA key to the SignedXml object.
        signedXml.SigningKey = DSAKey

        ' Create a reference to be signed.
        Dim reference As New Reference()

        ' Add the passed URI to the reference object.
        reference.Uri = URIString

        ' Add the reference to the SignedXml object.
        signedXml.AddReference(reference)

        ' Add a DSAKeyValue to the KeyInfo (optional; helps recipient find key to validate).
        Dim keyInfo As New KeyInfo()
        keyInfo.AddClause(New DSAKeyValue(CType(DSAKey, DSA)))
        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(ByVal 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
End Class

Das folgende Codebeispiel veranschaulicht das zum Signieren und überprüfen ein gesamtes XML-Dokument mit einer Signatur-Envelope.The following code example shows how to sign and verify an entire XML document using an enveloping signature.

//
// This example signs an XML file using an
// envelope signature. It then verifies the 
// signed XML.
//
#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, DSA^ DSAKey )
{
   
   // Create a new XML document.
   XmlDocument^ doc = gcnew XmlDocument;
   
   // Format the document to ignore white spaces.
   doc->PreserveWhitespace = false;
   
   // Load the passed XML file using its name.
   doc->Load( gcnew XmlTextReader( FileName ) );
   
   // Create a SignedXml object.
   SignedXml^ signedXml = gcnew SignedXml( doc );
   
   // Add the DSA key to the SignedXml document. 
   signedXml->SigningKey = DSAKey;
   
   // Create a reference to be signed.
   Reference^ reference = gcnew Reference;
   reference->Uri = "";
   
   // Add an enveloped transformation to the reference.
   XmlDsigEnvelopedSignatureTransform^ env = gcnew XmlDsigEnvelopedSignatureTransform;
   reference->AddTransform( env );
   
   // Add the reference to the SignedXml object.
   signedXml->AddReference( reference );
   
   // Add a DSAKeyValue to the KeyInfo (optional; helps recipient find key to validate).
   KeyInfo^ keyInfo = gcnew KeyInfo;
   keyInfo->AddClause( gcnew DSAKeyValue( safe_cast<DSA^>(DSAKey) ) );
   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() == XmlDeclaration::typeid )
   {
      doc->RemoveChild( doc->FirstChild );
   }

   
   // Save the signed XML document to a file specified
   // using the passed string.
   XmlTextWriter^ xmltw = gcnew XmlTextWriter( SignedFileName,gcnew 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 = gcnew 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 = gcnew SignedXml( xmlDocument );
   
   // Find the "Signature" node and create a new
   // XmlNodeList object.
   XmlNodeList^ nodeList = xmlDocument->GetElementsByTagName( "Signature" );
   
   // Load the signature node.
   signedXml->LoadXml( safe_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 = gcnew 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 = gcnew XmlTextWriter( FileName,gcnew UTF8Encoding( false ) );
   document->WriteTo( xmltw );
   xmltw->Close();
}

int main()
{
   try
   {
      
      // Generate a DSA signing key.
      DSACryptoServiceProvider^ DSAKey = gcnew DSACryptoServiceProvider;
      
      // 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", DSAKey );
      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 );
   }

}

//
// 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 DSA signing key.
            DSACryptoServiceProvider DSAKey = new DSACryptoServiceProvider();

            // 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", DSAKey);
            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, DSA DSAKey)
    {
        // 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 DSA key to the SignedXml document. 
        signedXml.SigningKey = DSAKey;

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

        // 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 a DSAKeyValue to the KeyInfo (optional; helps recipient find key to validate).
        KeyInfo keyInfo = new KeyInfo();
        keyInfo.AddClause(new DSAKeyValue((DSA)DSAKey));
        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();
    }
}
'
' 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 DSA signing key.
         Dim DSAKey As New DSACryptoServiceProvider()
         
         ' 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", DSAKey)
         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, DSAKey As DSA)
      ' 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 DSA key to the SignedXml document. 
      signedXml.SigningKey = DSAKey
      
      ' Create a reference to be signed.
      Dim reference As New Reference()
      reference.Uri = ""
      
      ' 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 a DSAKeyValue to the KeyInfo (optional; helps recipient find key to validate).
      Dim keyInfo As New KeyInfo()
      keyInfo.AddClause(New DSAKeyValue(CType(DSAKey, DSA)))
      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 

Gilt für: