X509BasicConstraintsExtension Clase

Definición

Espacio de nombres:

System.Security.Cryptography.X509Certificates

Ensamblado:

System.Security.Cryptography.dll

Source:

X509BasicConstraintsExtension.cs

Define las restricciones establecidas en un certificado. Esta clase no puede heredarse.

public ref class X509BasicConstraintsExtension sealed : System::Security::Cryptography::X509Certificates::X509Extension

public sealed class X509BasicConstraintsExtension : System.Security.Cryptography.X509Certificates.X509Extension

type X509BasicConstraintsExtension = class
    inherit X509Extension

Public NotInheritable Class X509BasicConstraintsExtension
Inherits X509Extension

Herencia

Object

AsnEncodedData

X509Extension

X509BasicConstraintsExtension

Ejemplos

En el ejemplo de código siguiente se muestra cómo abrir el almacén de certificados personal de un usuario y mostrar información sobre cada certificado del almacén. En este ejemplo se usa la X509BasicConstraintsExtension clase para mostrar la información.

#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

Comentarios

Esta clase proporciona propiedades que definen las restricciones básicas establecidas en un certificado.

Constructores

X509BasicConstraintsExtension()	Inicializa una nueva instancia de la clase X509BasicConstraintsExtension.
X509BasicConstraintsExtension(AsnEncodedData, Boolean)	Inicializa una nueva instancia de la clase X509BasicConstraintsExtension utilizando un objeto AsnEncodedData y un valor que identifica si la extensión es crítica.
X509BasicConstraintsExtension(Boolean, Boolean, Int32, Boolean)	Inicializa una nueva instancia de la clase X509BasicConstraintsExtension. Los parámetros especifican un valor que indica si el certificado es de una entidad de certificación (CA), otro valor que indica si existe alguna restricción en el número de niveles de ruta de acceso que permite, el número de niveles permitido en su ruta de acceso y un último valor que indica si la extensión es crítica.

Propiedades

CertificateAuthority	Obtiene un valor que indica si un certificado es de una entidad de certificación (CA).
Critical	Obtiene un valor booleano que indica si la extensión es crítica. (Heredado de X509Extension)
HasPathLengthConstraint	Obtiene un valor que indica si un certificado tiene restringido el número de niveles de ruta de acceso que permite.
Oid	Obtiene o establece el valor Oid de un objeto AsnEncodedData. (Heredado de AsnEncodedData)
PathLengthConstraint	Obtiene el número de niveles permitido en la ruta de acceso de un certificado.
RawData	Obtiene o establece los datos codificados mediante Notación de sintaxis abstracta uno (ASN.1, Abstract Syntax Notation One) que están representados en una matriz de bytes. (Heredado de AsnEncodedData)

Métodos

CopyFrom(AsnEncodedData)	Inicializa una nueva instancia de la clase X509BasicConstraintsExtension mediante un objeto AsnEncodedData.
CreateForCertificateAuthority(Nullable<Int32>)	Crea una instancia de adecuada para una entidad de X509BasicConstraintsExtension certificación, incluida opcionalmente un valor de restricción de longitud de ruta de acceso.
CreateForEndEntity(Boolean)	Crea una instancia de X509BasicConstraintsExtension adecuada para un certificado de entidad final, lo que opcionalmente marca la extensión como crítica.
Equals(Object)	Determina si el objeto especificado es igual que el objeto actual. (Heredado de Object)
Format(Boolean)	Devuelve una versión con formato de los datos codificados mediante Notación de sintaxis abstracta uno (ASN.1, Abstract Syntax Notation One) como una cadena. (Heredado de AsnEncodedData)
GetHashCode()	Sirve como la función hash predeterminada. (Heredado de Object)
GetType()	Obtiene el Type de la instancia actual. (Heredado de Object)
MemberwiseClone()	Crea una copia superficial del Object actual. (Heredado de Object)
ToString()	Devuelve una cadena que representa el objeto actual. (Heredado de Object)