Internal.Cryptography.Pal.ChainPal.Verify C# (CSharp) Method

        public bool? Verify(X509VerificationFlags flags, out Exception exception)
        {
            exception = null;

            CERT_CHAIN_POLICY_PARA para = new CERT_CHAIN_POLICY_PARA()
            {
                cbSize = Marshal.SizeOf<CERT_CHAIN_POLICY_PARA>(),
                dwFlags = (int)flags,
            };

            CERT_CHAIN_POLICY_STATUS status = new CERT_CHAIN_POLICY_STATUS()
            {
                cbSize = Marshal.SizeOf<CERT_CHAIN_POLICY_STATUS>(),
            };

            if (!Interop.crypt32.CertVerifyCertificateChainPolicy(ChainPolicy.CERT_CHAIN_POLICY_BASE, _chain, ref para, ref status))
            {
                int errorCode = Marshal.GetLastWin32Error();
                exception = errorCode.ToCryptographicException();
                return default(bool?);
            }
            return status.dwError == 0;
        }

        private static bool VerifyCertificateIgnoringErrors(SafeCertContextHandle pCertContext)
        {
            ChainPal chainPal = ChainPal.BuildChain(
                true,
                CertificatePal.FromHandle(pCertContext.DangerousGetHandle()),
                null, //extraStore
                null, //applicationPolicy
                null, //certificatePolicy
                X509RevocationMode.NoCheck,
                X509RevocationFlag.ExcludeRoot,
                DateTime.Now,
                new TimeSpan(0, 0, 0));

            if (chainPal == null)
            {
                return(false);
            }

            using (chainPal)
            {
                Exception verificationException;
                bool?     verified = chainPal.Verify(X509VerificationFlags.NoFlag, out verificationException);
                if (!(verified.HasValue && verified.Value))
                {
                    return(false);
                }
            }

            return(true);
        }