Opc.Ua.CertificateValidator.GetTrustedCertificate C# (CSharp) Method

        private async Task<CertificateIdentifier> GetTrustedCertificate(X509Certificate2 certificate)
        {
            string certificateThumbprint = certificate.Thumbprint.ToUpper();

            // check if explicitly trusted.
            if (m_trustedCertificateList != null)
            {
                for (int ii = 0; ii < m_trustedCertificateList.Count; ii++)
                {
                    X509Certificate2 trusted = await m_trustedCertificateList[ii].Find(false);

                    if (trusted != null && trusted.Thumbprint == certificate.Thumbprint)
                    {
                        if (Utils.IsEqual(trusted.RawData, certificate.RawData))
                        {
                            return m_trustedCertificateList[ii];
                        }
                    }
                }
            }

            // check if in peer trust store.
            if (m_trustedCertificateStore != null)
            {
                ICertificateStore store = m_trustedCertificateStore.OpenStore();

                try
                {
                    X509Certificate2Collection trusted = await store.FindByThumbprint(certificate.Thumbprint);

                    for (int ii = 0; ii < trusted.Count; ii++)
                    {
                        if (Utils.IsEqual(trusted[ii].RawData, certificate.RawData))
                        {
                            return new CertificateIdentifier(trusted[ii], m_trustedCertificateStore.ValidationOptions);
                        }
                    }
                }
                finally
                {
                    store.Close();
                }
            }

            // not a trusted.
            return null;
        }