UnmanagedCertificateContext.cs

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using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
 
namespace System.Net;
 
internal static class UnmanagedCertificateContext
{
    internal static X509Certificate2Collection GetRemoteCertificatesFromStoreContext(SafeFreeCertContext certContext)
    {
        if (certContext.IsInvalid)
        {
            return new X509Certificate2Collection();
        }
        return GetRemoteCertificatesFromStoreContext(certContext.DangerousGetHandle());
    }
 
    internal unsafe static X509Certificate2Collection GetRemoteCertificatesFromStoreContext(IntPtr certContext)
    {
        X509Certificate2Collection x509Certificate2Collection = new X509Certificate2Collection();
        if (certContext == IntPtr.Zero)
        {
            return x509Certificate2Collection;
        }
        global::Interop.Crypt32.CERT_CONTEXT cERT_CONTEXT = *(global::Interop.Crypt32.CERT_CONTEXT*)(void*)certContext;
        if (cERT_CONTEXT.hCertStore != IntPtr.Zero)
        {
            global::Interop.Crypt32.CERT_CONTEXT* pPrevCertContext = null;
            while (true)
            {
                global::Interop.Crypt32.CERT_CONTEXT* ptr = global::Interop.Crypt32.CertEnumCertificatesInStore(cERT_CONTEXT.hCertStore, pPrevCertContext);
                if (ptr == null)
                {
                    break;
                }
                X509Certificate2 x509Certificate = new X509Certificate2(new IntPtr(ptr));
                if (System.Net.NetEventSource.Log.IsEnabled())
                {
                    System.Net.NetEventSource.Info(certContext, $"Adding remote certificate:{x509Certificate}", "GetRemoteCertificatesFromStoreContext");
                }
                x509Certificate2Collection.Add(x509Certificate);
                pPrevCertContext = ptr;
            }
        }
        return x509Certificate2Collection;
    }
}