Validatin X509 Certificates

[Raphael Correa de Carvalho]

I'm porting a small piece of Java that will fetch HTML from a secured web
page. The Java code was purposely written to accept any client
certificate - even out of date certificates. This was accomplished by
implementing an X509TrustManager that accepted any certificate.

I'm trying to understand how to do the equivalent in Windows Phone with C# (Visual Studio).

Does anyone know how to do this? Help would be very much appreciated.
Thanks in advance.

I have an example code, but X509Store and X509Certificate2Collection doesn't exist in Windows Phone...

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.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.");
}
}
}