X509BasicConstraintsExtension Constructors
Definition
Important
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Initializes a new instance of the X509BasicConstraintsExtension class.
Overloads
| X509BasicConstraintsExtension() |
Initializes a new instance of the X509BasicConstraintsExtension class. |
| X509BasicConstraintsExtension(AsnEncodedData, Boolean) |
Initializes a new instance of the X509BasicConstraintsExtension class using an AsnEncodedData object and a value that identifies whether the extension is critical. |
| X509BasicConstraintsExtension(Boolean, Boolean, Int32, Boolean) |
Initializes a new instance of the X509BasicConstraintsExtension class. Parameters specify a value that indicates whether a certificate is a certificate authority (CA) certificate, a value that indicates whether the certificate has a restriction on the number of path levels it allows, the number of levels allowed in a certificate's path, and a value that indicates whether the extension is critical. |
X509BasicConstraintsExtension()
Initializes a new instance of the X509BasicConstraintsExtension class.
public:
X509BasicConstraintsExtension();public X509BasicConstraintsExtension();Public Sub New ()Examples
The following code example demonstrates how to open a user's personal certificate store and display information about each certificate in the store. This example uses the X509BasicConstraintsExtension class to display the information.
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
Applies to
X509BasicConstraintsExtension(AsnEncodedData, Boolean)
Initializes a new instance of the X509BasicConstraintsExtension class using an AsnEncodedData object and a value that identifies whether the extension is critical.
public:
X509BasicConstraintsExtension(System::Security::Cryptography::AsnEncodedData ^ encodedBasicConstraints, bool critical);public X509BasicConstraintsExtension(System.Security.Cryptography.AsnEncodedData encodedBasicConstraints, bool critical);new System.Security.Cryptography.X509Certificates.X509BasicConstraintsExtension : System.Security.Cryptography.AsnEncodedData * bool -> System.Security.Cryptography.X509Certificates.X509BasicConstraintsExtensionPublic Sub New (encodedBasicConstraints As AsnEncodedData, critical As Boolean)Parameters
- encodedBasicConstraints
- AsnEncodedData
The encoded data to use to create the extension.
- critical
- Boolean
true if the extension is critical; otherwise, false.
Remarks
Use this constructor if the information to create an extension is already in an AsnEncodedData object.
Applies to
X509BasicConstraintsExtension(Boolean, Boolean, Int32, Boolean)
Initializes a new instance of the X509BasicConstraintsExtension class. Parameters specify a value that indicates whether a certificate is a certificate authority (CA) certificate, a value that indicates whether the certificate has a restriction on the number of path levels it allows, the number of levels allowed in a certificate's path, and a value that indicates whether the extension is critical.
public:
X509BasicConstraintsExtension(bool certificateAuthority, bool hasPathLengthConstraint, int pathLengthConstraint, bool critical);public X509BasicConstraintsExtension(bool certificateAuthority, bool hasPathLengthConstraint, int pathLengthConstraint, bool critical);new System.Security.Cryptography.X509Certificates.X509BasicConstraintsExtension : bool * bool * int * bool -> System.Security.Cryptography.X509Certificates.X509BasicConstraintsExtensionPublic Sub New (certificateAuthority As Boolean, hasPathLengthConstraint As Boolean, pathLengthConstraint As Integer, critical As Boolean)Parameters
- certificateAuthority
- Boolean
true if the certificate is a certificate authority (CA) certificate; otherwise, false.
- hasPathLengthConstraint
- Boolean
true if the certificate has a restriction on the number of path levels it allows; otherwise, false.
- pathLengthConstraint
- Int32
The number of levels allowed in a certificate's path.
- critical
- Boolean
true if the extension is critical; otherwise, false.
