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

        public async Task<bool> GetIssuers(X509Certificate2Collection certificates, List<CertificateIdentifier> issuers)
        {
            bool isTrusted = false;
            CertificateIdentifier issuer = null;
            X509Certificate2 certificate = certificates[0];

            CertificateIdentifierCollection collection = new CertificateIdentifierCollection();

            for (int ii = 1; ii < certificates.Count; ii++)
            {
                collection.Add(new CertificateIdentifier(certificates[ii]));
            }

            do
            {
                issuer = await GetIssuer(certificate, m_trustedCertificateList, m_trustedCertificateStore, true);

                if (issuer == null)
                {
                    issuer = await GetIssuer(certificate, m_issuerCertificateList, m_issuerCertificateStore, true);

                    if (issuer == null)
                    {
                        issuer = await GetIssuer(certificate, collection, null, true);
                    }
                }

                if (issuer != null)
                {
                    isTrusted = true;

                    issuers.Add(issuer);
                    certificate = await issuer.Find(false);

                    // check for root.
                    if (Utils.CompareDistinguishedName(certificate.Subject, certificate.Issuer))
                    {
                        break;
                    }
                }
                else
                {
                    isTrusted = false;
                }
            }
            while (issuer != null);

            return isTrusted;
        }