/// <summary>
/// Initializes a new <see cref="CertificateChain"/> instance from a <see cref="Certificate"/>.
/// </summary>
/// <param name="cert">The certificate for which a chain is being built.</param>
/// <param name="additional">Any additional store to be searched for supporting certificates and CTLs.</param>
/// <param name="options">Additional certificate chain options.</param>
/// <remarks><paramref name="cert"/> will always be the end certificate.</remarks>
/// <exception cref="ArgumentNullException"><paramref name="cert"/> is a null reference (<b>Nothing</b> in Visual Basic).</exception>
/// <exception cref="CertificateException">An error occurs while building the certificate chain.</exception>
public CertificateChain(Certificate cert, CertificateStore additional, CertificateChainOptions options)
{
if (cert == null)
{
throw new ArgumentNullException();
}
IntPtr addstore = additional == null ? IntPtr.Zero : additional.Handle;
ChainParameters para = new ChainParameters();
para.cbSize = Marshal.SizeOf(typeof(ChainParameters));
para.RequestedUsagecUsageIdentifier = 0;
para.RequestedUsagedwType = 0;
para.RequestedUsagergpszUsageIdentifier = IntPtr.Zero;
if (SspiProvider.CertGetCertificateChain(IntPtr.Zero, cert.Handle, IntPtr.Zero, addstore, ref para, (int)options, IntPtr.Zero, ref m_Handle) == 0)
{
throw new CertificateException("Unable to find the certificate chain.");
}
m_Certificate = cert;
}
