XmlDsigC14NTransform 类

参考

定义

命名空间:: System.Security.Cryptography.Xml

程序集:: System.Security.Cryptography.Xml.dll

程序集:: System.Security.dll

包:: System.Security.Cryptography.Xml v8.0.2

包:: System.Security.Cryptography.Xml v9.0.0-rc.2.24473.5

Source:: XmlDsigC14NTransform.cs

Source:: XmlDsigC14NTransform.cs

Source:: XmlDsigC14NTransform.cs

Source:: XmlDsigC14NTransform.cs

Source:: XmlDsigC14NTransform.cs

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

表示由万维网联合会 (W3C) 定义的数字签名的 C14N XML 标准化转换（不带注释）。

public ref class XmlDsigC14NTransform : System::Security::Cryptography::Xml::Transform

public class XmlDsigC14NTransform : System.Security.Cryptography.Xml.Transform

type XmlDsigC14NTransform = class
    inherit Transform

Public Class XmlDsigC14NTransform
Inherits Transform

继承: Object

Transform
XmlDsigC14NTransform

派生: System.Security.Cryptography.Xml.XmlDsigC14NWithCommentsTransform

示例

本部分包含两个代码示例。第一个示例演示如何使用分离签名对非 XML 数据进行签名。示例 #1 在 XML 文件中创建的 www.microsoft.com 签名，然后验证该文件。第二个示例演示如何调用类的成员 XmlDsigC14NTransform 。

示例 #1

//
// This example signs a file specified by a URI 
// using a detached 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 SignDetachedResource( String^ URIString, String^ XmlSigFileName, RSA^ Key )
{
   
   // Create a SignedXml object.
   SignedXml^ signedXml = gcnew SignedXml;
   
   // Assign the key to the SignedXml object.
   signedXml->SigningKey = Key;
   
   // 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 an RSAKeyValue KeyInfo (optional; helps recipient find key to validate).
   KeyInfo^ keyInfo = gcnew KeyInfo;
   keyInfo->AddClause( gcnew RSAKeyValue( safe_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();
   
   // 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();
}



[STAThread]
int main()
{
   array<String^>^args = Environment::GetCommandLineArgs();
   
   // 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.
      RSA^ Key = RSA::Create();
      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 successfully 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.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.
            RSA Key = RSA.Create();

            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 successfully 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 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();
    }
}

'
' This example signs a file specified by a URI 
' using a detached signature. It then verifies  
' the signed XML.
'
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 RSA = RSA.Create()
         
         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 successfully 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 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
End Class

示例 #2

#using <System.dll>
#using <System.Xml.dll>
#using <System.Security.dll>
using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Security::Cryptography;
using namespace System::Security::Cryptography::Xml;
using namespace System::Security::Cryptography::X509Certificates;

ref class Class1
{
private:
   static String^ Certificate = L"..\\..\\my509.cer";

public:
   [STAThread]
   static void Main()
   {
      // Encrypt an XML message
      XmlDocument^ productsXml = LoadProducts();
      ShowTransformProperties( productsXml );
      SignDocument( productsXml );
      ShowTransformProperties( productsXml );
      
      // Use XmlDsigC14NTransform to resolve a Uri.
      Uri^ baseUri = gcnew Uri( L"http://www.contoso.com" );
      String^ relativeUri = L"xml";
      Uri^ absoluteUri = ResolveUris( baseUri, relativeUri );
      Console::WriteLine( L"This sample completed successfully; "
         L"press Enter to exit." );
      Console::ReadLine();
   }


private:
   // Encrypt the text in the specified XmlDocument.
   static void ShowTransformProperties( XmlDocument^ xmlDoc )
   {
      XmlDsigC14NTransform^ xmlTransform =
         gcnew XmlDsigC14NTransform( true );

      // Ensure the transform is using the appropriate algorithm.
      xmlTransform->Algorithm =
         SignedXml::XmlDsigExcC14NTransformUrl;

      // Retrieve the XML representation of the current transform.
      XmlElement^ xmlInTransform = xmlTransform->GetXml();

      Console::WriteLine( L"\nXml representation of the current transform: " );
      Console::WriteLine( xmlInTransform->OuterXml );
      
      // Retrieve the valid input types for the current transform.
      array<Type^>^validInTypes = xmlTransform->InputTypes;

      // Verify the xmlTransform can accept the XMLDocument as an
      // input type.
      for ( int i = 0; i < validInTypes->Length; i++ )
      {
         if ( validInTypes[ i ] == xmlDoc->GetType() )
         {
            // Load the document into the transfrom.
            xmlTransform->LoadInput( xmlDoc );

            XmlDsigC14NTransform^ secondTransform = gcnew XmlDsigC14NTransform;

            String^ classDescription = secondTransform->ToString();

            // This call does not perform as expected.
            // This transform does not contain inner XML elements
            secondTransform->LoadInnerXml( xmlDoc->SelectNodes( L"//." ) );

            break;
         }
      }
      
      array<Type^>^validOutTypes = xmlTransform->OutputTypes;

      for ( int i = 0; i < validOutTypes->Length; i++ )
      {
         if ( validOutTypes[ i ] == System::IO::Stream::typeid )
         {
            try
            {
               
               Type^ streamType = System::IO::Stream::typeid;
               MemoryStream^ outputStream = static_cast<MemoryStream^>(
                  xmlTransform->GetOutput( streamType ));

               // Read the CryptoStream into a stream reader.
               StreamReader^ streamReader =
                  gcnew StreamReader( outputStream );
               
               // Read the stream into a string.
               String^ outputMessage = streamReader->ReadToEnd();
               
               // Close the streams.
               outputStream->Close();
               streamReader->Close();
               
               // Display to the console the Xml before and after
               // encryption.
               Console::WriteLine( L"Encoding the following xml: {0}",
                  xmlDoc->OuterXml );
               Console::WriteLine( L"Message encoded: {0}", outputMessage );
            }
            catch ( Exception^ ex ) 
            {
               Console::WriteLine( L"Unexpected exception caught: {0}", ex );
            }

            break;
         }
         else
         {
            Object^ outputObject = xmlTransform->GetOutput();
         }
      }
   }

   // Create an XML document describing various products.
   static XmlDocument^ LoadProducts()
   {
      XmlDocument^ xmlDoc = gcnew XmlDocument;
      String^ contosoProducts = L"<PRODUCTS>";
      contosoProducts = String::Concat( contosoProducts,
         L"<PRODUCT><ID>123</ID>");
      contosoProducts = String::Concat( contosoProducts,
         L"<DESCRIPTION>Router</DESCRIPTION></PRODUCT>");
      contosoProducts = String::Concat( contosoProducts,
         L"<PRODUCT><ID>456</ID>");
       contosoProducts = String::Concat( contosoProducts,
        L"<DESCRIPTION>Keyboard</DESCRIPTION></PRODUCT>");
      
      // Include a comment to test the comments feature of the transform.
      contosoProducts = String::Concat( contosoProducts,
         L"<!--Comments are included in the transform-->" );
      
      // Include the CDATA tag to test the transform results.
      contosoProducts = String::Concat( contosoProducts,
         L"<PARTNER_URL><![CDATA['http:\\\\www.contoso.com" );
      contosoProducts = String::Concat( contosoProducts,
         L"\\partner.asp?h1=en&h2=cr']]></PARTNER_URL>" );
      contosoProducts = String::Concat( contosoProducts,
         L"</PRODUCTS>" );

      xmlDoc->LoadXml( contosoProducts );
      return xmlDoc;
   }

   // Create a signature and add it to the specified document.
   static void SignDocument( XmlDocument^ xmlDoc )
   {
      // Generate a signing key.
      RSA^ Key = RSA::Create();
      
      // Create a SignedXml object.
      SignedXml^ signedXml = gcnew SignedXml( xmlDoc );
      
      // Add the key to the SignedXml document.
      signedXml->SigningKey = Key;
      
      // Create a reference to be signed.
      Reference^ reference = gcnew Reference;
      reference->Uri = L"";
      
      // Add an enveloped transformation to the reference.
      reference->AddTransform( gcnew XmlDsigC14NTransform );
      
      // Add the reference to the SignedXml object.
      signedXml->AddReference( reference );
      try
      {
         // Create a new KeyInfo object.
         KeyInfo^ keyInfo = gcnew KeyInfo;
         
         // Load the X509 certificate.
         X509Certificate^ MSCert =
            X509Certificate::CreateFromCertFile( Certificate );
         
         // Load the certificate into a KeyInfoX509Data object
         // and add it to the KeyInfo object.
         keyInfo->AddClause( gcnew KeyInfoX509Data( MSCert ) );
         
         // Add the KeyInfo object to the SignedXml object.
         signedXml->KeyInfo = keyInfo;
      }
      catch ( FileNotFoundException^ ) 
      {
         Console::WriteLine( L"Unable to locate the following file: {0}",
            Certificate );
      }
      catch ( CryptographicException^ ex ) 
      {
         Console::WriteLine( L"Unexpected exception caught while creating "
         L"the certificate:{0}", ex );
      }
      
      // Compute the signature.
      signedXml->ComputeSignature();
      
      // Add the signature branch to the original tree so it is enveloped.
      xmlDoc->DocumentElement->AppendChild( signedXml->GetXml() );
   }

   // Resolve the specified base and relative Uri's .
   static Uri^ ResolveUris( Uri^ baseUri, String^ relativeUri )
   {
      XmlUrlResolver^ xmlResolver = gcnew XmlUrlResolver;
      xmlResolver->Credentials =
         System::Net::CredentialCache::DefaultCredentials;
      XmlDsigC14NTransform^ xmlTransform = gcnew XmlDsigC14NTransform;
      xmlTransform->Resolver = xmlResolver;

      Uri^ absoluteUri = xmlResolver->ResolveUri( baseUri, relativeUri );
      if ( absoluteUri != nullptr )
      {
         Console::WriteLine(
            L"\nResolved the base Uri and relative Uri to the following:" );
         Console::WriteLine( absoluteUri );
      }
      else
      {
         Console::WriteLine( L"Unable to resolve the base Uri and relative Uri" );
      }

      return absoluteUri;
   }
};

int main()
{
   Class1::Main();
}

//
// This sample produces the following output:
//
// Xml representation of the current transform:
// <Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" xmln
// s="http://www.w3.org/2000/09/xmldsig#" />
// Encoding the following xml: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Rou
// ter</DESCRIPTION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESC
// RIPTION></PRODUCT><!--Comments are included in the transform--><PARTNER_URL
// ><![CDATA['http:\\www.contoso.com\partner.asp?h1=en&h2=cr']]></PARTNER_URL>
// </PRODUCTS>Message encoded: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Rou
// ter</DESCRIPTION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESC
// RIPTION></PRODUCT><!--Comments are included in the transform--><PARTNER_URL
// >'http:\\www.contoso.com\partner.asp?h1=en&h2=cr'</PARTNER_URL></PRODUC
// TS>
// Xml representation of the current transform:
// <Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" xmln
// s="http://www.w3.org/2000/09/xmldsig#" />
// Encoding the following xml: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Rou
// ter</DESCRIPTION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESC
// RIPTION></PRODUCT><!--Comments are included in the transform--><PARTNER_URL
// ><![CDATA['http:\\www.contoso.com\partner.asp?h1=en&h2=cr']]></PARTNER_URL>
// <Signature xmlns="http://www.w3.org/2000/09/xmldsig#"><SignedInfo><Canonica
// lizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"
// /><SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" /
// ><Reference URI=""><Transforms><Transform Algorithm="http://www.w3.org/TR/2
// 001/REC-xml-c14n-20010315" /></Transforms><DigestMethod Algorithm="http://w
// ww.w3.org/2000/09/xmldsig#sha1" /><DigestValue>BFN2s0/NA2NGgb/R0mvfnNM0Ito=
// </DigestValue></Reference></SignedInfo><SignatureValue>vSfZUG5xHuNxzOSEbQjN
// dtEt1D+O7I1LTJ13RrwLaJSfQPrdT/s8IeaA+idw2f2WGuGrdqMJUddpE4GxfK61HmPQ6S7lBG+
// +ND+YaUYf2AtTRs3SnToXQQrARa/pHVjsKxYHR/9tjy6maHBwxjgjFQABvYZu0gZHYRuXvvfxv0
// 8=</SignatureValue><KeyInfo><X509Data xmlns="http://www.w3.org/2000/09/xmld
// sig#"><X509Certificate>MIICCzCCAXSgAwIBAgIQ5eVQY8pRZ5xBF2WLkYPjijANBgkqhkiG
// 9w0BAQQFADAbMRkwFwYDVQQDExBHcmVnc0NlcnRpZmljYXRlMB4XDTAzMDkxNzIzMzU0N1oXDTM
// 5MTIzMTIzNTk1OVowGzEZMBcGA1UEAxMQR3JlZ3NDZXJ0aWZpY2F0ZTCBnzANBgkqhkiG9w0BAQ
// EFAAOBjQAwgYkCgYEAmFJ4v7rS3BYTXgVW9PgBFfTYAcB/m9mOFCmUrrChcBpoEtu/tSESlNfEH
// pECIdqg9vUrCNSkY08HRn3ueNeBSnSpssWd8/XoOboWLh1nd+79Y5uZd1WOJI4s0XM0MegZgCoJ
// cEEhpxCd/HOPIQvEsbpN/DuFiovZLo+Ek3hHoxMCAwEAAaNQME4wTAYDVR0BBEUwQ4AQaCb19dl
// yf/zSxPVYQZY9AKEdMBsxGTAXBgNVBAMTEEdyZWdzQ2VydGlmaWNhdGWCEOXlUGPKUWecQRdli5
// GD44owDQYJKoZIhvcNAQEEBQADgYEAZuZaFDGDJogh7FuT0hfaMAVlRONv6wWVBJVV++eUo38Xu
// RfJ5nNJ0UnhiV2sEtLobYBPEIrNhuk8skdU0AHgx4ILiA4rR96ifWwxtrFQF+h+DL2ZB7xhwcOJ
// +Pa7IC4wIaEp/oBmmX+JHSzfQt6/If4ohwikfxfljKMyIcMlwl4=</X509Certificate></X50
// 9Data></KeyInfo></Signature></PRODUCTS>
//
// Message encoded: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Router</DESCRI
// PTION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESCRIPTION></P
// RODUCT><!--Comments are included in the transform--><PARTNER_URL>'http:\\ww
// w.contoso.com\partner.asp?h1=en&h2=cr'</PARTNER_URL><Signature><SignedI
// nfo><CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c1
// 4n-20010315"></CanonicalizationMethod><SignatureMethod Algorithm="http://ww
// w.w3.org/2000/09/xmldsig#rsa-sha1"></SignatureMethod><Reference URI=""><Tra
// nsforms><Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-200103
// 15"></Transform></Transforms><DigestMethod Algorithm="http://www.w3.org/200
// 0/09/xmldsig#sha1"></DigestMethod><DigestValue>BFN2s0/NA2NGgb/R0mvfnNM0Ito=
// </DigestValue></Reference></SignedInfo><SignatureValue>vSfZUG5xHuNxzOSEbQjN
// dtEt1D+O7I1LTJ13RrwLaJSfQPrdT/s8IeaA+idw2f2WGuGrdqMJUddpE4GxfK61HmPQ6S7lBG+
// +ND+YaUYf2AtTRs3SnToXQQrARa/pHVjsKxYHR/9tjy6maHBwxjgjFQABvYZu0gZHYRuXvvfxv0
// 8=</SignatureValue><KeyInfo><X509Data xmlns="http://www.w3.org/2000/09/xmld
// sig#"><X509Certificate>MIICCzCCAXSgAwIBAgIQ5eVQY8pRZ5xBF2WLkYPjijANBgkqhkiG
// 9w0BAQQFADAbMRkwFwYDVQQDExBHcmVnc0NlcnRpZmljYXRlMB4XDTAzMDkxNzIzMzU0N1oXDTM
// 5MTIzMTIzNTk1OVowGzEZMBcGA1UEAxMQR3JlZ3NDZXJ0aWZpY2F0ZTCBnzANBgkqhkiG9w0BAQ
// EFAAOBjQAwgYkCgYEAmFJ4v7rS3BYTXgVW9PgBFfTYAcB/m9mOFCmUrrChcBpoEtu/tSESlNfEH
// pECIdqg9vUrCNSkY08HRn3ueNeBSnSpssWd8/XoOboWLh1nd+79Y5uZd1WOJI4s0XM0MegZgCoJ
// cEEhpxCd/HOPIQvEsbpN/DuFiovZLo+Ek3hHoxMCAwEAAaNQME4wTAYDVR0BBEUwQ4AQaCb19dl
// yf/zSxPVYQZY9AKEdMBsxGTAXBgNVBAMTEEdyZWdzQ2VydGlmaWNhdGWCEOXlUGPKUWecQRdli5
// GD44owDQYJKoZIhvcNAQEEBQADgYEAZuZaFDGDJogh7FuT0hfaMAVlRONv6wWVBJVV++eUo38Xu
// RfJ5nNJ0UnhiV2sEtLobYBPEIrNhuk8skdU0AHgx4ILiA4rR96ifWwxtrFQF+h+DL2ZB7xhwcOJ
// +Pa7IC4wIaEp/oBmmX+JHSzfQt6/If4ohwikfxfljKMyIcMlwl4=</X509Certificate></X50
// 9Data></KeyInfo></Signature></PRODUCTS>
//
// Resolved the base Uri and relative Uri to the following:
// http://www.contoso.com/xml
// This sample completed successfully; press Enter to exit.

using System;
using System.IO;
using System.Xml;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
using System.Security.Cryptography.X509Certificates;

class Class1
{
    private static string Certificate =  "..\\..\\my509.cer";

    [STAThread]
    static void Main(string[] args)
    {
        // Encrypt an XML message
        XmlDocument productsXml = LoadProducts();
        ShowTransformProperties(productsXml);

        SignDocument(ref productsXml);
        ShowTransformProperties(productsXml);

        // Use XmlDsigC14NTransform to resolve a Uri.
        Uri baseUri = new Uri("http://www.contoso.com");
        string relativeUri = "xml";
        Uri absoluteUri = ResolveUris(baseUri, relativeUri);

        Console.WriteLine("This sample completed successfully; " +
            "press Enter to exit.");
        Console.ReadLine();
    }

    // Encrypt the text in the specified XmlDocument.
    private static void ShowTransformProperties(XmlDocument xmlDoc)
    {
        XmlDsigC14NTransform xmlTransform = 
            new XmlDsigC14NTransform(true);

        // Ensure the transform is using the appropriate algorithm.
        xmlTransform.Algorithm =
            SignedXml.XmlDsigExcC14NTransformUrl;

        // Retrieve the XML representation of the current transform.
        XmlElement xmlInTransform = xmlTransform.GetXml();

        Console.WriteLine("\nXml representation of the current transform: ");
        Console.WriteLine(xmlInTransform.OuterXml);

        // Retrieve the valid input types for the current transform.
        Type[] validInTypes = xmlTransform.InputTypes;

        // Verify the xmlTransform can accept the XMLDocument as an
        // input type.
        for (int i=0; i<validInTypes.Length; i++)
        {
            if (validInTypes[i] == xmlDoc.GetType())
            {
                // Load the document into the transfrom.
                xmlTransform.LoadInput(xmlDoc);

                XmlDsigC14NTransform secondTransform = 
                    new XmlDsigC14NTransform();

                string classDescription = secondTransform.ToString();

                // This call does not perform as expected.
                // This transform does not contain inner XML elements
                secondTransform.LoadInnerXml(xmlDoc.SelectNodes("//."));

                break;
            }
        }

        Type[] validOutTypes = xmlTransform.OutputTypes;

        for (int i=0; i<validOutTypes.Length;i++)
        {
            if (validOutTypes[i] == typeof(System.IO.Stream))
            {
                try 
                {
                    Type streamType = typeof(System.IO.Stream);
                    MemoryStream outputStream = (MemoryStream) 
                        xmlTransform.GetOutput(streamType);

                    // Read the CryptoStream into a stream reader.
                    StreamReader streamReader =
                        new StreamReader(outputStream);

                    // Read the stream into a string.
                    string outputMessage = streamReader.ReadToEnd();

                    // Close the streams.
                    outputStream.Close();
                    streamReader.Close();

                    // Display to the console the Xml before and after
                    // encryption.
                    Console.WriteLine("Encoding the following xml: " +
                        xmlDoc.OuterXml);
                    Console.WriteLine("Message encoded: " + outputMessage);
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Unexpected exception caught: " +
                        ex.ToString());
                }

                break;
            }
            else
            {
                object outputObject = xmlTransform.GetOutput();
            }
        }
    }

    // Create an XML document describing various products.
    private static XmlDocument LoadProducts()
    {
        XmlDocument xmlDoc = new XmlDocument();

        string contosoProducts = "<PRODUCTS>";
        contosoProducts += "<PRODUCT><ID>123</ID>";
        contosoProducts += "<DESCRIPTION>Router</DESCRIPTION></PRODUCT>";
        contosoProducts += "<PRODUCT><ID>456</ID>";
        contosoProducts += "<DESCRIPTION>Keyboard</DESCRIPTION></PRODUCT>";

        // Include a comment to test the comments feature of the transform.
        contosoProducts += "<!--Comments are included in the transform-->";

        // Include the CDATA tag to test the transform results.
        contosoProducts += "<PARTNER_URL><![CDATA['http:\\\\www.contoso.com";
        contosoProducts += "\\partner.asp?h1=en&h2=cr']]></PARTNER_URL>";
        contosoProducts += "</PRODUCTS>";

        xmlDoc.LoadXml(contosoProducts);
        return xmlDoc;
    }

    // Create a signature and add it to the specified document.
    private static void SignDocument(ref XmlDocument xmlDoc)
    {
        // Generate a signing key.
        RSA Key = RSA.Create();

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

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

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

        // Add an enveloped transformation to the reference.
        reference.AddTransform(new XmlDsigC14NTransform());

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

        try 
        {
            // Create a new KeyInfo object.
            KeyInfo keyInfo = new KeyInfo();

            // Load the X509 certificate.
            X509Certificate MSCert =
                X509Certificate.CreateFromCertFile(Certificate);

            // Load the certificate into a KeyInfoX509Data object
            // and add it to the KeyInfo object.
            keyInfo.AddClause(new KeyInfoX509Data(MSCert));

            // Add the KeyInfo object to the SignedXml object.
            signedXml.KeyInfo = keyInfo;
        }
        catch (FileNotFoundException)
        {
            Console.WriteLine("Unable to locate the following file: " + 
                Certificate);
        }
        catch (CryptographicException ex)
        {
            Console.WriteLine("Unexpected exception caught whild creating " +
                "the certificate:" + ex.ToString());
        }

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

        // Add the signature branch to the original tree so it is enveloped.
        xmlDoc.DocumentElement.AppendChild(signedXml.GetXml());
    }

    // Resolve the specified base and relative Uri's .
    private static Uri ResolveUris(Uri baseUri, string relativeUri)
    {
        XmlUrlResolver xmlResolver = new XmlUrlResolver();
        xmlResolver.Credentials = 
            System.Net.CredentialCache.DefaultCredentials;

        XmlDsigC14NTransform xmlTransform =
            new XmlDsigC14NTransform();
        xmlTransform.Resolver = xmlResolver;

        Uri absoluteUri = xmlResolver.ResolveUri(baseUri, relativeUri);

        if (absoluteUri != null)
        {
            Console.WriteLine(
                "\nResolved the base Uri and relative Uri to the following:");
            Console.WriteLine(absoluteUri.ToString());
        }
        else
        {
            Console.WriteLine(
                "Unable to resolve the base Uri and relative Uri");
        }
        return absoluteUri;
    }
}
//
// This sample produces the following output:
//
// Xml representation of the current transform:
// <Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" xmln
// s="http://www.w3.org/2000/09/xmldsig#" />
// Encoding the following xml: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Rou
// ter</DESCRIPTION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESC
// RIPTION></PRODUCT><!--Comments are included in the transform--><PARTNER_URL
// ><![CDATA['http:\\www.contoso.com\partner.asp?h1=en&h2=cr']]></PARTNER_URL>
// </PRODUCTS>Message encoded: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Rou
// ter</DESCRIPTION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESC
// RIPTION></PRODUCT><!--Comments are included in the transform--><PARTNER_URL
// >'http:\\www.contoso.com\partner.asp?h1=en&h2=cr'</PARTNER_URL></PRODUC
// TS>

// Xml representation of the current transform:
// <Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" xmln
// s="http://www.w3.org/2000/09/xmldsig#" />
// Encoding the following xml: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Rou
// ter</DESCRIPTION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESC
// RIPTION></PRODUCT><!--Comments are included in the transform--><PARTNER_URL
// ><![CDATA['http:\\www.contoso.com\partner.asp?h1=en&h2=cr']]></PARTNER_URL>
// <Signature xmlns="http://www.w3.org/2000/09/xmldsig#"><SignedInfo><Canonica
// lizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" 
// /><SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" /
// ><Reference URI=""><Transforms><Transform Algorithm="http://www.w3.org/TR/2
// 001/REC-xml-c14n-20010315" /></Transforms><DigestMethod Algorithm="http://w
// ww.w3.org/2000/09/xmldsig#sha1" /><DigestValue>BFN2s0/NA2NGgb/R0mvfnNM0Ito=
// </DigestValue></Reference></SignedInfo><SignatureValue>vSfZUG5xHuNxzOSEbQjN
// dtEt1D+O7I1LTJ13RrwLaJSfQPrdT/s8IeaA+idw2f2WGuGrdqMJUddpE4GxfK61HmPQ6S7lBG+
// +ND+YaUYf2AtTRs3SnToXQQrARa/pHVjsKxYHR/9tjy6maHBwxjgjFQABvYZu0gZHYRuXvvfxv0
// 8=</SignatureValue><KeyInfo><X509Data xmlns="http://www.w3.org/2000/09/xmld
// sig#"><X509Certificate>MIICCzCCAXSgAwIBAgIQ5eVQY8pRZ5xBF2WLkYPjijANBgkqhkiG
// 9w0BAQQFADAbMRkwFwYDVQQDExBHcmVnc0NlcnRpZmljYXRlMB4XDTAzMDkxNzIzMzU0N1oXDTM
// 5MTIzMTIzNTk1OVowGzEZMBcGA1UEAxMQR3JlZ3NDZXJ0aWZpY2F0ZTCBnzANBgkqhkiG9w0BAQ
// EFAAOBjQAwgYkCgYEAmFJ4v7rS3BYTXgVW9PgBFfTYAcB/m9mOFCmUrrChcBpoEtu/tSESlNfEH
// pECIdqg9vUrCNSkY08HRn3ueNeBSnSpssWd8/XoOboWLh1nd+79Y5uZd1WOJI4s0XM0MegZgCoJ
// cEEhpxCd/HOPIQvEsbpN/DuFiovZLo+Ek3hHoxMCAwEAAaNQME4wTAYDVR0BBEUwQ4AQaCb19dl
// yf/zSxPVYQZY9AKEdMBsxGTAXBgNVBAMTEEdyZWdzQ2VydGlmaWNhdGWCEOXlUGPKUWecQRdli5
// GD44owDQYJKoZIhvcNAQEEBQADgYEAZuZaFDGDJogh7FuT0hfaMAVlRONv6wWVBJVV++eUo38Xu
// RfJ5nNJ0UnhiV2sEtLobYBPEIrNhuk8skdU0AHgx4ILiA4rR96ifWwxtrFQF+h+DL2ZB7xhwcOJ
// +Pa7IC4wIaEp/oBmmX+JHSzfQt6/If4ohwikfxfljKMyIcMlwl4=</X509Certificate></X50
// 9Data></KeyInfo></Signature></PRODUCTS>
//
// Message encoded: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Router</DESCRI
// PTION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESCRIPTION></P
// RODUCT><!--Comments are included in the transform--><PARTNER_URL>'http:\\ww
// w.contoso.com\partner.asp?h1=en&h2=cr'</PARTNER_URL><Signature><SignedI
// nfo><CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c1
// 4n-20010315"></CanonicalizationMethod><SignatureMethod Algorithm="http://ww
// w.w3.org/2000/09/xmldsig#rsa-sha1"></SignatureMethod><Reference URI=""><Tra
// nsforms><Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-200103
// 15"></Transform></Transforms><DigestMethod Algorithm="http://www.w3.org/200
// 0/09/xmldsig#sha1"></DigestMethod><DigestValue>BFN2s0/NA2NGgb/R0mvfnNM0Ito=
// </DigestValue></Reference></SignedInfo><SignatureValue>vSfZUG5xHuNxzOSEbQjN
// dtEt1D+O7I1LTJ13RrwLaJSfQPrdT/s8IeaA+idw2f2WGuGrdqMJUddpE4GxfK61HmPQ6S7lBG+
// +ND+YaUYf2AtTRs3SnToXQQrARa/pHVjsKxYHR/9tjy6maHBwxjgjFQABvYZu0gZHYRuXvvfxv0
// 8=</SignatureValue><KeyInfo><X509Data xmlns="http://www.w3.org/2000/09/xmld
// sig#"><X509Certificate>MIICCzCCAXSgAwIBAgIQ5eVQY8pRZ5xBF2WLkYPjijANBgkqhkiG
// 9w0BAQQFADAbMRkwFwYDVQQDExBHcmVnc0NlcnRpZmljYXRlMB4XDTAzMDkxNzIzMzU0N1oXDTM
// 5MTIzMTIzNTk1OVowGzEZMBcGA1UEAxMQR3JlZ3NDZXJ0aWZpY2F0ZTCBnzANBgkqhkiG9w0BAQ
// EFAAOBjQAwgYkCgYEAmFJ4v7rS3BYTXgVW9PgBFfTYAcB/m9mOFCmUrrChcBpoEtu/tSESlNfEH
// pECIdqg9vUrCNSkY08HRn3ueNeBSnSpssWd8/XoOboWLh1nd+79Y5uZd1WOJI4s0XM0MegZgCoJ
// cEEhpxCd/HOPIQvEsbpN/DuFiovZLo+Ek3hHoxMCAwEAAaNQME4wTAYDVR0BBEUwQ4AQaCb19dl
// yf/zSxPVYQZY9AKEdMBsxGTAXBgNVBAMTEEdyZWdzQ2VydGlmaWNhdGWCEOXlUGPKUWecQRdli5
// GD44owDQYJKoZIhvcNAQEEBQADgYEAZuZaFDGDJogh7FuT0hfaMAVlRONv6wWVBJVV++eUo38Xu
// RfJ5nNJ0UnhiV2sEtLobYBPEIrNhuk8skdU0AHgx4ILiA4rR96ifWwxtrFQF+h+DL2ZB7xhwcOJ
// +Pa7IC4wIaEp/oBmmX+JHSzfQt6/If4ohwikfxfljKMyIcMlwl4=</X509Certificate></X50
// 9Data></KeyInfo></Signature></PRODUCTS>
//
// Resolved the base Uri and relative Uri to the following:
// http://www.contoso.com/xml
// This sample completed successfully; press Enter to exit.

Imports System.IO
Imports System.Xml
Imports System.Security.Cryptography
Imports System.Security.Cryptography.Xml
Imports System.Security.Cryptography.X509Certificates

Public Class Form1
    Inherits System.Windows.Forms.Form

    Private certificateFilePath As String = "..\\my509.cer"

    ' Event handler for Run button.
    Private Sub Button1_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click

        tbxOutput.Cursor = Cursors.WaitCursor
        tbxOutput.Text = ""

        ' Encrypt an XML message
        Dim productsXml As XmlDocument = LoadProducts()
        ShowTransformProperties(productsXml)

        SignDocument(productsXml)
        ShowTransformProperties(productsXml)

        ' Use XmlDsigC14NTransform to resolve a Uri.
        Dim baseUri As New Uri("http://www.contoso.com")
        Dim relativeUri As String = "xml"
        Dim absoluteUri As Uri = ResolveUris(baseUri, relativeUri)

        ' Align interface and conclude application.
        WriteLine(vbCrLf + "This sample completed successfully;" + _
            " press Exit to continue.")

        ' Reset the cursor.
        tbxOutput.Cursor = Cursors.Default
    End Sub

    ' Encrypt the text in the specified XmlDocument.
    Private Sub ShowTransformProperties(ByVal xmlDoc As XmlDocument)
        Dim xmlTransform As New XmlDsigC14NTransform(True)

        ' Ensure the transform is using the appropriate algorithm.
        xmlTransform.Algorithm = _
            SignedXml.XmlDsigExcC14NTransformUrl

        ' Retrieve the XML representation of the current transform.
        Dim xmlInTransform As XmlElement = xmlTransform.GetXml()

        WriteLine(vbCrLf + "Xml representation of the current transform: ")
        WriteLine(xmlInTransform.OuterXml)

        ' Retrieve the valid input types for the current transform.
        Dim validInTypes() As Type = xmlTransform.InputTypes

        ' Verify the xmlTransform can accept the XMLDocument as an
        ' input type.
        For i As Int16 = 0 To validInTypes.Length Step 1
            If (validInTypes(i).Equals(xmlDoc.GetType())) Then
                ' Load the document into the transfrom.
                xmlTransform.LoadInput(xmlDoc)

                Dim secondTransform As New XmlDsigC14NTransform

                Dim classDescription As String = secondTransform.ToString()

                ' This call does not perform as expected.
                ' This transform does not contain inner XML elements
                secondTransform.LoadInnerXml(xmlDoc.SelectNodes("//."))
                Exit For
            End If
        Next

        Dim validOutTypes() As Type = xmlTransform.OutputTypes
        For i As Int16 = 0 To validOutTypes.Length - 1 Step 1
            If (validOutTypes(i).Equals(GetType(System.IO.Stream))) Then
                Try
                    Dim streamType As Type = GetType(System.IO.Stream)
                    Dim outputStream As MemoryStream
                    outputStream = CType( _
                        xmlTransform.GetOutput(streamType), _
                        MemoryStream)

                    ' Read the CryptoStream into a stream reader.
                    Dim streamReader As New StreamReader(outputStream)

                    ' Read the stream into a string.
                    Dim outputMessage As String = streamReader.ReadToEnd()

                    ' Close the streams.
                    outputStream.Close()
                    streamReader.Close()

                    ' Display to the console the Xml before and after
                    ' encryption.
                    WriteLine("Encoding the following xml: " + _
                        xmlDoc.OuterXml)
                    WriteLine("Message encoded: " + outputMessage)

                Catch ex As Exception
                    WriteLine("Unexpected exception caught: " + ex.ToString())

                End Try
            Else
                Dim outputObject As Object = xmlTransform.GetOutput()

            End If
        Next
    End Sub

    ' Create an XML document describing various products.
    Private Function LoadProducts() As XmlDocument
        Dim xmlDoc As New XmlDocument

        Dim contosoProducts As String = "<PRODUCTS>"
        contosoProducts += "<PRODUCT><ID>123</ID>"
        contosoProducts += "<DESCRIPTION>Router</DESCRIPTION></PRODUCT>"
        contosoProducts += "<PRODUCT><ID>456</ID>"
        contosoProducts += "<DESCRIPTION>Keyboard</DESCRIPTION></PRODUCT>"

        ' Include a comment to test the comments feature of the transform.
        contosoProducts += "<!--Comments are included in the transform-->"

        ' Include the CDATA tag to test the transform results.
        contosoProducts += "<PARTNER_URL><![CDATA['http:\\\\www.contoso.com"
        contosoProducts += "\\partner.asp?h1=en&h2=cr']]></PARTNER_URL>"
        contosoProducts += "</PRODUCTS>"

        xmlDoc.LoadXml(contosoProducts)
        Return xmlDoc
    End Function

    ' Create a signature and add it to the specified document.
    Private Sub SignDocument(ByRef xmlDoc As XmlDocument)
        ' Generate a signing key.
        Dim Key As RSA = RSA.Create()

        ' Create a SignedXml object.
        Dim signedXml As New SignedXml(xmlDoc)

        ' Add the key to the SignedXml document. 
        signedXml.SigningKey = Key

        ' Create a reference to be signed.
        Dim reference As New Reference
        reference.Uri = ""

        ' Add an enveloped transformation to the reference.
        reference.AddTransform(New XmlDsigC14NTransform)

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

        Try
            ' Create a new KeyInfo object.
            Dim keyInfo As New KeyInfo

            ' Load the X509 certificate.
            Dim certificate As X509Certificate
            certificate = X509Certificate.CreateFromCertFile( _
                certificateFilePath)

            ' Load the certificate into a KeyInfoX509Data object
            ' and add it to the KeyInfo object.
            keyInfo.AddClause(New KeyInfoX509Data(certificate))

            ' Add the KeyInfo object to the SignedXml object.
            signedXml.KeyInfo = keyInfo
        Catch ex As FileNotFoundException
            WriteLine("Unable to locate the following file: " + _
                certificateFilePath)
        Catch ex As CryptographicException
            WriteLine("Unexpected exception caught whild creating " + _
                "the certificate:" + ex.ToString())
        End Try

        ' Compute the signature.
        signedXml.ComputeSignature()

        ' Add the signature branch to the original tree so it is enveloped.
        xmlDoc.DocumentElement.AppendChild(signedXml.GetXml())
    End Sub

    ' Resolve the specified base and relative Uri's .
    Private Function ResolveUris( _
        ByVal baseUri As Uri, _
        ByVal relativeUri As String) As Uri

        Dim xmlResolver As New XmlUrlResolver
        xmlResolver.Credentials = _
            System.Net.CredentialCache.DefaultCredentials

        Dim xmlTransform As New XmlDsigC14NTransform
        xmlTransform.Resolver = xmlResolver

        Dim absoluteUri As Uri = xmlResolver.ResolveUri(baseUri, relativeUri)

        If Not absoluteUri Is Nothing Then
            WriteLine(vbCrLf + _
                "Resolved the base Uri and relative Uri to the following:")
            WriteLine(absoluteUri.ToString())
        Else
            WriteLine("Unable to resolve the base Uri and relative Uri")
        End If

        Return absoluteUri
    End Function

    ' Write specified message and carriage return to the output textbox.
    Private Sub WriteLine(ByVal message As String)
        tbxOutput.AppendText(message + vbCrLf)

    End Sub

    ' Event handler for Exit button.
    Private Sub Button2_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button2.Click

        Application.Exit()
    End Sub
#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Panel2 As System.Windows.Forms.Panel
    Friend WithEvents Panel1 As System.Windows.Forms.Panel
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents tbxOutput As System.Windows.Forms.RichTextBox
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.Panel2 = New System.Windows.Forms.Panel
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Panel1 = New System.Windows.Forms.Panel
        Me.tbxOutput = New System.Windows.Forms.RichTextBox
        Me.Panel2.SuspendLayout()
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        '
        'Panel2
        '
        Me.Panel2.Controls.Add(Me.Button1)
        Me.Panel2.Controls.Add(Me.Button2)
        Me.Panel2.Dock = System.Windows.Forms.DockStyle.Bottom
        Me.Panel2.DockPadding.All = 20
        Me.Panel2.Location = New System.Drawing.Point(0, 320)
        Me.Panel2.Name = "Panel2"
        Me.Panel2.Size = New System.Drawing.Size(616, 64)
        Me.Panel2.TabIndex = 1
        '
        'Button1
        '
        Me.Button1.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button1.Font = New System.Drawing.Font( _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button1.Location = New System.Drawing.Point(446, 20)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(75, 24)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "&Run"
        '
        'Button2
        '
        Me.Button2.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button2.Font = New System.Drawing.Font( _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button2.Location = New System.Drawing.Point(521, 20)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(75, 24)
        Me.Button2.TabIndex = 3
        Me.Button2.Text = "E&xit"
        '
        'Panel1
        '
        Me.Panel1.Controls.Add(Me.tbxOutput)
        Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.Panel1.DockPadding.All = 20
        Me.Panel1.Location = New System.Drawing.Point(0, 0)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(616, 320)
        Me.Panel1.TabIndex = 2
        '
        'tbxOutput
        '
        Me.tbxOutput.AccessibleDescription = _
            "Displays output from application."
        Me.tbxOutput.AccessibleName = "Output textbox."
        Me.tbxOutput.Dock = System.Windows.Forms.DockStyle.Fill
        Me.tbxOutput.Location = New System.Drawing.Point(20, 20)
        Me.tbxOutput.Name = "tbxOutput"
        Me.tbxOutput.Size = New System.Drawing.Size(576, 280)
        Me.tbxOutput.TabIndex = 1
        Me.tbxOutput.Text = "Click the Run button to run the application."
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(616, 384)
        Me.Controls.Add(Me.Panel1)
        Me.Controls.Add(Me.Panel2)
        Me.Name = "Form1"
        Me.Text = "XmlDsigC14NTransform"
        Me.Panel2.ResumeLayout(False)
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region
End Class
'
' This sample produces the following output:
'
' Xml representation of the current transform: 
' <Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" xmlns
' ="http://www.w3.org/2000/09/xmldsig#" />
' Encoding the following xml: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Rout
' er</DESCRIPTION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESCRI
' PTION></PRODUCT><!--Comments are included in the transform--><PARTNER_URL><!
' [CDATA['http:\\\\www.contoso.com\\partner.asp?h1=en&h2=cr']]></PARTNER_URL><
' /PRODUCTS>
' Message encoded: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Router</DESCRIP
' TION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESCRIPTION></PRO
' DUCT><!--Comments are included in the transform--><PARTNER_URL>'http:\\\\www
' .contoso.com\\partner.asp?h1=en&h2=cr'</PARTNER_URL></PRODUCTS>
' Unable to locate the following file: ..\\my509.cer
' 
' Xml representation of the current transform: 
' <Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" xmlns
' ="http://www.w3.org/2000/09/xmldsig#" />
' Encoding the following xml: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Rout
' er</DESCRIPTION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESCRI
' PTION></PRODUCT><!--Comments are included in the transform--><PARTNER_URL><!
' [CDATA['http:\\\\www.contoso.com\\partner.asp?h1=en&h2=cr']]></PARTNER_URL><
' Signature xmlns="http://www.w3.org/2000/09/xmldsig#"><SignedInfo><Canonicali
' zationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" /><
' SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" /><Re
' ference URI=""><Transforms><Transform Algorithm="http://www.w3.org/TR/2001/R
' EC-xml-c14n-20010315" /></Transforms><DigestMethod Algorithm="http://www.w3.
' org/2000/09/xmldsig#sha1" /><DigestValue>reODk69AR9ytcttnNovo4tHNr7s=</Diges
' tValue></Reference></SignedInfo><SignatureValue>shFIRZqXidkxzQtZwGa7xqWoS0yF
' GDot63A8v17KZzmfDWTaluGk25fvKJ4Bv4Z1ENxevyQY/wCGzsto9FJUvTXsJ9/jTOwIvRQt1204
' gJ8SgTex8epH/2xnfvdEqZR8HWJq3X/NixGhMUCpmEFwZMn3V/8qryg8mhYp72jPTFI=</Signat
' ureValue></Signature></PRODUCTS>
' Message encoded: <PRODUCTS><PRODUCT><ID>123</ID><DESCRIPTION>Router</DESCRIP
' TION></PRODUCT><PRODUCT><ID>456</ID><DESCRIPTION>Keyboard</DESCRIPTION></PRO
' DUCT><!--Comments are included in the transform--><PARTNER_URL>'http:\\\\www
' .contoso.com\\partner.asp?h1=en&h2=cr'</PARTNER_URL><Signature><SignedIn
' fo><CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n
' -20010315"></CanonicalizationMethod><SignatureMethod Algorithm="http://www.w
' 3.org/2000/09/xmldsig#rsa-sha1"></SignatureMethod><Reference URI=""><Transfo
' rms><Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"><
' /Transform></Transforms><DigestMethod Algorithm="http://www.w3.org/2000/09/x
' mldsig#sha1"></DigestMethod><DigestValue>reODk69AR9ytcttnNovo4tHNr7s=</Diges
' tValue></Reference></SignedInfo><SignatureValue>shFIRZqXidkxzQtZwGa7xqWoS0yF
' GDot63A8v17KZzmfDWTaluGk25fvKJ4Bv4Z1ENxevyQY/wCGzsto9FJUvTXsJ9/jTOwIvRQt1204
' gJ8SgTex8epH/2xnfvdEqZR8HWJq3X/NixGhMUCpmEFwZMn3V/8qryg8mhYp72jPTFI=</Signat
' ureValue></Signature></PRODUCTS>
' 
' Resolved the base Uri and relative Uri to the following:
' http://www.contoso.com/xml
' 
' This sample completed successfully; press Exit to continue.

注解

类 XmlDsigC14NTransform 表示 C14N XML 规范化转换，该转换描述 XML 文档的规范形式。此转换允许签名者创建摘要 (用于使用 XML 文档规范形式创建数字签名) 。然后，收件人可以使用相同转换的 XML 文档规范形式来验证 XML 数字签名。

XmlDsigC14NTransform需要对不包含注释的 XML 文档进行签名时，请使用类。

在大多数情况下，不需要规范化转换类的新实例。若要指定规范化转换，请将描述转换的统一资源标识符 (URI) 传递给 CanonicalizationMethod 属性，该属性可从 SignedInfo 属性访问。若要获取对规范化转换的引用，请使用 CanonicalizationMethodObject 可从属性访问 SignedInfo 的属性。

描述类的 XmlDsigC14NTransform URI 由 XmlDsigC14NTransformUrl 字段和 XmlDsigCanonicalizationUrl 字段定义。

只需创建规范化转换类的新实例即可手动对 XML 文档进行哈希处理或使用自己的规范化算法。

有关 C14N 转换的详细信息，请参阅 W3C XMLDSIG 规范的第 6.5 和 6.6.1 部分。规范化算法在 W3C 规范 XML 规范中定义。

构造函数

XmlDsigC14NTransform()	初始化 XmlDsigC14NTransform 类的新实例。
XmlDsigC14NTransform(Boolean)	如果指定了注释，则使用注释初始化 XmlDsigC14NTransform 类的新实例。

属性

Algorithm	获取或设置用于标识当前转换所执行的算法的统一资源标识符 (URI)。 (继承自 Transform)
Context	获取或设置一个 XmlElement 对象，该对象表示当前 Transform 对象运行的文档上下文。 (继承自 Transform)
InputTypes	获取一个类型数组，这些类型是当前 XmlDsigC14NTransform 对象的 LoadInput(Object) 方法的有效输入。
OutputTypes	获取一个类型数组，这些类型是当前 XmlDsigC14NTransform 对象的 GetOutput() 方法的可能输出。
PropagatedNamespaces	获取或设置一个 Hashtable 对象，该对象包含传播到签名中的命名空间。 (继承自 Transform)
Resolver	设置当前的 XmlResolver 对象。 (继承自 Transform)

方法

Equals(Object)	确定指定对象是否等于当前对象。 (继承自 Object)
GetDigestedOutput(HashAlgorithm)	返回与 XmlDsigC14NTransform 对象关联的摘要。
GetDigestedOutput(HashAlgorithm)	当在派生类中重写时，返回与 Transform 对象关联的摘要。 (继承自 Transform)
GetHashCode()	作为默认哈希函数。 (继承自 Object)
GetInnerXml()	返回 XmlDsigC14NTransform 对象的参数的 XML 表示形式，适合以 XMLDSIG `<Transform>` 元素的子元素的形成来包含这些参数。
GetOutput()	返回当前 XmlDsigC14NTransform 对象的输出。
GetOutput(Type)	返回 Stream 类型的当前 XmlDsigC14NTransform 对象的输出。
GetType()	获取当前实例的 Type。 (继承自 Object)
GetXml()	返回当前 Transform 对象的 XML 表示形式。 (继承自 Transform)
LoadInnerXml(XmlNodeList)	将指定的 XmlNodeList 对象分析为 `<Transform>` 元素特定于转换的内容；此方法不受支持，因为此元素没有内部 XML 元素。
LoadInput(Object)	将指定的输入加载到当前 XmlDsigC14NTransform 对象中。
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
ToString()	返回表示当前对象的字符串。 (继承自 Object)

适用于

通过

XmlDsigC14NTransform 类

定义

示例

注解

构造函数

属性

方法

适用于

其他资源