X509KeyUsageExtension Konstruktoren

Definition

Namespace:

System.Security.Cryptography.X509Certificates

Assembly:

System.Security.Cryptography.dll

Initialisiert eine neue Instanz der X509KeyUsageExtension-Klasse.

Überlädt

X509KeyUsageExtension()	Initialisiert eine neue Instanz der X509KeyUsageExtension-Klasse.
X509KeyUsageExtension(AsnEncodedData, Boolean)	Initialisiert eine neue Instanz der X509KeyUsageExtension-Klasse mithilfe eines AsnEncodedData-Objekts und eines Werts, der angibt, ob die Erweiterung wichtig ist.
X509KeyUsageExtension(X509KeyUsageFlags, Boolean)	Initialisiert eine neue Instanz der X509KeyUsageExtension-Klasse mithilfe des angegebenen X509KeyUsageFlags-Werts und eines Werts, der angibt, ob die Erweiterung wichtig ist.

X509KeyUsageExtension()

Quelle:

X509KeyUsageExtension.cs

Initialisiert eine neue Instanz der X509KeyUsageExtension-Klasse.

public:
 X509KeyUsageExtension();

public X509KeyUsageExtension ();

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 X509KeyUsageExtension -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

X509KeyUsageExtension(AsnEncodedData, Boolean)

Quelle:

X509KeyUsageExtension.cs

Initialisiert eine neue Instanz der X509KeyUsageExtension-Klasse mithilfe eines AsnEncodedData-Objekts und eines Werts, der angibt, ob die Erweiterung wichtig ist.

public:
 X509KeyUsageExtension(System::Security::Cryptography::AsnEncodedData ^ encodedKeyUsage, bool critical);

public X509KeyUsageExtension (System.Security.Cryptography.AsnEncodedData encodedKeyUsage, bool critical);

new System.Security.Cryptography.X509Certificates.X509KeyUsageExtension : System.Security.Cryptography.AsnEncodedData * bool -> System.Security.Cryptography.X509Certificates.X509KeyUsageExtension

Public Sub New (encodedKeyUsage As AsnEncodedData, critical As Boolean)

Parameter

encodedKeyUsage

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 sich die Informationen zum Erstellen der Erweiterung bereits in einem Objekt enthalten AsnEncodedData .

X509KeyUsageExtension(X509KeyUsageFlags, Boolean)

Quelle:

X509KeyUsageExtension.cs

Initialisiert eine neue Instanz der X509KeyUsageExtension-Klasse mithilfe des angegebenen X509KeyUsageFlags-Werts und eines Werts, der angibt, ob die Erweiterung wichtig ist.

public:
 X509KeyUsageExtension(System::Security::Cryptography::X509Certificates::X509KeyUsageFlags keyUsages, bool critical);

public X509KeyUsageExtension (System.Security.Cryptography.X509Certificates.X509KeyUsageFlags keyUsages, bool critical);

new System.Security.Cryptography.X509Certificates.X509KeyUsageExtension : System.Security.Cryptography.X509Certificates.X509KeyUsageFlags * bool -> System.Security.Cryptography.X509Certificates.X509KeyUsageExtension

Public Sub New (keyUsages As X509KeyUsageFlags, critical As Boolean)

Parameter

keyUsages

X509KeyUsageFlags

Einer der X509KeyUsageFlags-Werte, die die Verwendung des Schlüssels beschreiben.

critical

Boolean

true, wenn die Erweiterung wichtig ist, andernfalls false.