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X509EnhancedKeyUsageExtension Konstruktoren

Definition

Initialisiert eine neue Instanz der X509EnhancedKeyUsageExtension-Klasse.

Überlädt

X509EnhancedKeyUsageExtension()

Initialisiert eine neue Instanz der X509EnhancedKeyUsageExtension-Klasse.

X509EnhancedKeyUsageExtension(AsnEncodedData, Boolean)

Initialisiert eine neue Instanz der X509EnhancedKeyUsageExtension-Klasse mithilfe eines AsnEncodedData-Objekts und eines Werts, der angibt, ob die Erweiterung wichtig ist.

X509EnhancedKeyUsageExtension(OidCollection, Boolean)

Initialisiert eine neue Instanz der X509EnhancedKeyUsageExtension-Klasse mithilfe einer OidCollection und eines Werts, der angibt, ob die Erweiterung wichtig ist.

X509EnhancedKeyUsageExtension()

Initialisiert eine neue Instanz der X509EnhancedKeyUsageExtension-Klasse.

public:
 X509EnhancedKeyUsageExtension();
public X509EnhancedKeyUsageExtension ();
Public Sub New ()

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie Sie den persönlichen Zertifikatspeicher eines Benutzers öffnen und Informationen zu jedem Zertifikat im Speicher anzeigen. In diesem Beispiel wird die X509EnhancedKeyUsageExtension Klasse verwendet, um die Informationen anzuzeigen.

#using <System.dll>
#using <system.security.dll>

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Security::Cryptography::X509Certificates;
int main()
{
   try
   {
      X509Store^ store = gcnew X509Store( L"MY",StoreLocation::CurrentUser );
      store->Open( static_cast<OpenFlags>(OpenFlags::ReadOnly | OpenFlags::OpenExistingOnly) );
      X509Certificate2Collection^ collection = dynamic_cast<X509Certificate2Collection^>(store->Certificates);
      for ( int i = 0; i < collection->Count; i++ )
      {
         System::Collections::IEnumerator^ myEnum = collection[ i ]->Extensions->GetEnumerator();
         while ( myEnum->MoveNext() )
         {
            X509Extension^ extension = safe_cast<X509Extension^>(myEnum->Current);
            Console::WriteLine( L"{0}({1})", extension->Oid->FriendlyName, extension->Oid->Value );
            if ( extension->Oid->FriendlyName == L"Key Usage" )
            {
               X509KeyUsageExtension^ ext = dynamic_cast<X509KeyUsageExtension^>(extension);
               Console::WriteLine( ext->KeyUsages );
            }
            if ( extension->Oid->FriendlyName == L"Basic Constraints" )
            {
               X509BasicConstraintsExtension^ ext = dynamic_cast<X509BasicConstraintsExtension^>(extension);
               Console::WriteLine( ext->CertificateAuthority );
               Console::WriteLine( ext->HasPathLengthConstraint );
               Console::WriteLine( ext->PathLengthConstraint );
            }
            if ( extension->Oid->FriendlyName == L"Subject Key Identifier" )
            {
               X509SubjectKeyIdentifierExtension^ ext = dynamic_cast<X509SubjectKeyIdentifierExtension^>(extension);
               Console::WriteLine( ext->SubjectKeyIdentifier );
            }
            if ( extension->Oid->FriendlyName == L"Enhanced Key Usage" )
            {
               X509EnhancedKeyUsageExtension^ ext = dynamic_cast<X509EnhancedKeyUsageExtension^>(extension);
               OidCollection^ oids = ext->EnhancedKeyUsages;
               System::Collections::IEnumerator^ myEnum1 = oids->GetEnumerator();
               while ( myEnum1->MoveNext() )
               {
                  Oid^ oid = safe_cast<Oid^>(myEnum1->Current);
                  Console::WriteLine( L"{0}({1})", oid->FriendlyName, oid->Value );
               }
            }
         }

      }
      store->Close();
   }
   catch ( CryptographicException^ ) 
   {
      Console::WriteLine( L"Information could not be written out for this certificate." );
   }

}
using System;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;

public class CertSelect
{
    public static void Main()
    {
        try
        {
            X509Store store = new X509Store("MY", StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);

            X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates;
            for (int i = 0; i < collection.Count; i++)
            {
                foreach (X509Extension extension in collection[i].Extensions)
                {
                    Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")");

                    if (extension.Oid.FriendlyName == "Key Usage")
                    {
                        X509KeyUsageExtension ext = (X509KeyUsageExtension)extension;
                        Console.WriteLine(ext.KeyUsages);
                    }

                    if (extension.Oid.FriendlyName == "Basic Constraints")
                    {
                        X509BasicConstraintsExtension ext = (X509BasicConstraintsExtension)extension;
                        Console.WriteLine(ext.CertificateAuthority);
                        Console.WriteLine(ext.HasPathLengthConstraint);
                        Console.WriteLine(ext.PathLengthConstraint);
                    }

                    if (extension.Oid.FriendlyName == "Subject Key Identifier")
                    {
                        X509SubjectKeyIdentifierExtension ext = (X509SubjectKeyIdentifierExtension)extension;
                        Console.WriteLine(ext.SubjectKeyIdentifier);
                    }

                    if (extension.Oid.FriendlyName == "Enhanced Key Usage")
                    {
                        X509EnhancedKeyUsageExtension ext = (X509EnhancedKeyUsageExtension)extension;
                        OidCollection oids = ext.EnhancedKeyUsages;
                        foreach (Oid oid in oids)
                        {
                            Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")");
                        }
                    }
                }
            }
            store.Close();
        }
        catch (CryptographicException)
        {
            Console.WriteLine("Information could not be written out for this certificate.");
        }
    }
}
Imports System.Security.Cryptography
Imports System.Security.Cryptography.X509Certificates



Module CertSelect

    Sub Main()
        Try
            Dim store As New X509Store("MY", StoreLocation.CurrentUser)
            store.Open(OpenFlags.ReadOnly Or OpenFlags.OpenExistingOnly)

            Dim collection As X509Certificate2Collection = CType(store.Certificates, X509Certificate2Collection)
            For i As Integer = 0 To collection.Count - 1
                Dim extension As X509Extension
                For Each extension In collection(i).Extensions
                    Console.WriteLine(extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")")


                    If extension.Oid.FriendlyName = "Key Usage" Then
                        Dim ext As X509KeyUsageExtension = CType(extension, X509KeyUsageExtension)
                        Console.WriteLine(ext.KeyUsages)
                    End If

                    If extension.Oid.FriendlyName = "Basic Constraints" Then
                        Dim ext As X509BasicConstraintsExtension = CType(extension, X509BasicConstraintsExtension)
                        Console.WriteLine(ext.CertificateAuthority)
                        Console.WriteLine(ext.HasPathLengthConstraint)
                        Console.WriteLine(ext.PathLengthConstraint)
                    End If

                    If extension.Oid.FriendlyName = "Subject Key Identifier" Then
                        Dim ext As X509SubjectKeyIdentifierExtension = CType(extension, X509SubjectKeyIdentifierExtension)
                        Console.WriteLine(ext.SubjectKeyIdentifier)
                    End If

                    If extension.Oid.FriendlyName = "Enhanced Key Usage" Then
                        Dim ext As X509EnhancedKeyUsageExtension = CType(extension, X509EnhancedKeyUsageExtension)
                        Dim oids As OidCollection = ext.EnhancedKeyUsages
                        Dim oid As Oid
                        For Each oid In oids
                            Console.WriteLine(oid.FriendlyName + "(" + oid.Value + ")")
                        Next oid
                    End If
                Next extension
            Next i
            store.Close()
        Catch
            Console.WriteLine("Information could not be written out for this certificate.")
        End Try

    End Sub
End Module

Hinweise

Verwenden Sie diese Methode, um eine neue Instanz der X509EnhancedKeyUsageExtension Klasse zu erstellen. Nachdem die Instanz erstellt wurde, können Sie die EnhancedKeyUsages Eigenschaft verwenden, um die Auflistung von Objektbezeichnern (OIDs) abzurufen, die die Anwendungen angeben, die den Schlüssel verwenden.

Gilt für

X509EnhancedKeyUsageExtension(AsnEncodedData, Boolean)

Initialisiert eine neue Instanz der X509EnhancedKeyUsageExtension-Klasse mithilfe eines AsnEncodedData-Objekts und eines Werts, der angibt, ob die Erweiterung wichtig ist.

public:
 X509EnhancedKeyUsageExtension(System::Security::Cryptography::AsnEncodedData ^ encodedEnhancedKeyUsages, bool critical);
public X509EnhancedKeyUsageExtension (System.Security.Cryptography.AsnEncodedData encodedEnhancedKeyUsages, bool critical);
new System.Security.Cryptography.X509Certificates.X509EnhancedKeyUsageExtension : System.Security.Cryptography.AsnEncodedData * bool -> System.Security.Cryptography.X509Certificates.X509EnhancedKeyUsageExtension
Public Sub New (encodedEnhancedKeyUsages As AsnEncodedData, critical As Boolean)

Parameter

encodedEnhancedKeyUsages
AsnEncodedData

Die codierten Daten, aus denen die Erweiterung erstellt werden soll.

critical
Boolean

true, wenn die Erweiterung wichtig ist, andernfalls false.

Hinweise

Verwenden Sie diesen Konstruktor, wenn die Informationen zum Erstellen der Erweiterung bereits in einem AsnEncodedData Objekt enthalten sind.

Gilt für

X509EnhancedKeyUsageExtension(OidCollection, Boolean)

Initialisiert eine neue Instanz der X509EnhancedKeyUsageExtension-Klasse mithilfe einer OidCollection und eines Werts, der angibt, ob die Erweiterung wichtig ist.

public:
 X509EnhancedKeyUsageExtension(System::Security::Cryptography::OidCollection ^ enhancedKeyUsages, bool critical);
public X509EnhancedKeyUsageExtension (System.Security.Cryptography.OidCollection enhancedKeyUsages, bool critical);
new System.Security.Cryptography.X509Certificates.X509EnhancedKeyUsageExtension : System.Security.Cryptography.OidCollection * bool -> System.Security.Cryptography.X509Certificates.X509EnhancedKeyUsageExtension
Public Sub New (enhancedKeyUsages As OidCollection, critical As Boolean)

Parameter

enhancedKeyUsages
OidCollection

Eine OidCollection-Auflistung.

critical
Boolean

true, wenn die Erweiterung wichtig ist, andernfalls false.

Ausnahmen

Die angegebene OidCollection enthält einen oder mehrere fehlerhafte Werte.

Gilt für