X509EnhancedKeyUsageExtension Construtores

Referência

Definição

Namespace:: System.Security.Cryptography.X509Certificates

Assembly:: System.Security.Cryptography.X509Certificates.dll

Assembly:: System.Security.Cryptography.dll

Assembly:: System.dll

Assembly:: netstandard.dll

Importante

Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.

Inicializa uma nova instância da classe X509EnhancedKeyUsageExtension.

Sobrecargas

X509EnhancedKeyUsageExtension()	Inicializa uma nova instância da classe X509EnhancedKeyUsageExtension.
X509EnhancedKeyUsageExtension(AsnEncodedData, Boolean)	Inicializa uma nova instância da classe X509EnhancedKeyUsageExtension usando um objeto AsnEncodedData e um valor que identifica se a extensão é crítica.
X509EnhancedKeyUsageExtension(OidCollection, Boolean)	Inicializa uma nova instância da classe X509EnhancedKeyUsageExtension usando uma OidCollection e um valor que identifica se a extensão é crítica.

X509EnhancedKeyUsageExtension()

Inicializa uma nova instância da classe X509EnhancedKeyUsageExtension.

public:
 X509EnhancedKeyUsageExtension();

public X509EnhancedKeyUsageExtension ();

Public Sub New ()

Exemplos

O exemplo de código a seguir demonstra como abrir o repositório de certificados pessoais de um usuário e exibir informações sobre cada certificado no repositório. Este exemplo usa a X509EnhancedKeyUsageExtension classe para exibir as informações.

#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

Comentários

Use esse método para criar uma nova instância da X509EnhancedKeyUsageExtension classe. Depois que a instância for criada, você poderá usar a EnhancedKeyUsages propriedade para obter a coleção de identificadores de objeto (OIDs) que indicam os aplicativos que usam a chave.

Aplica-se a

X509EnhancedKeyUsageExtension(AsnEncodedData, Boolean)

Inicializa uma nova instância da classe X509EnhancedKeyUsageExtension usando um objeto AsnEncodedData e um valor que identifica se a extensão é crítica.

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)

Parâmetros

encodedEnhancedKeyUsages: AsnEncodedData

Os dados codificados a serem usados para criar a extensão.

critical: Boolean

true se a extensão for crítica, caso contrário, false.

Comentários

Use esse construtor se as informações para criar a extensão já estiverem em um AsnEncodedData objeto.

Aplica-se a

X509EnhancedKeyUsageExtension(OidCollection, Boolean)

Inicializa uma nova instância da classe X509EnhancedKeyUsageExtension usando uma OidCollection e um valor que identifica se a extensão é crítica.

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)

Parâmetros

enhancedKeyUsages: OidCollection

Uma coleção OidCollection.

critical: Boolean

true se a extensão for crítica, caso contrário, false.

Exceções

CryptographicException

A OidCollection especificada contém um ou mais valores corrompidos.

Aplica-se a

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X509EnhancedKeyUsageExtension Construtores

Definição

Sobrecargas

X509EnhancedKeyUsageExtension()

Exemplos

Comentários

Aplica-se a

X509EnhancedKeyUsageExtension(AsnEncodedData, Boolean)

Parâmetros

Comentários

Aplica-se a

X509EnhancedKeyUsageExtension(OidCollection, Boolean)

Parâmetros

Exceções

Aplica-se a

Recursos adicionais