Opc.Ua.X509CRL.VerifySignature C# (CSharp) Method

        public bool VerifySignature(X509Certificate2 issuer, bool throwOnError)
        {
            Win32.CERT_CONTEXT context = (Win32.CERT_CONTEXT)Marshal.PtrToStructure(issuer.Handle, typeof(Win32.CERT_CONTEXT));
            Win32.CERT_INFO info = (Win32.CERT_INFO)Marshal.PtrToStructure(context.pCertInfo, typeof(Win32.CERT_INFO));

            int bResult = Win32.CryptVerifyCertificateSignature(
                IntPtr.Zero,
                Win32.X509_ASN_ENCODING,
                m_pBuffer,
                m_bufferSize,
                ref info.SubjectPublicKeyInfo);

            if (bResult == 0)
            {
                if (throwOnError)
                {
                    throw Win32.GetLastError(StatusCodes.BadCertificateInvalid, "Could not get verify signature on CRL.");
                }

                return false;
            }

            m_issuer = issuer;
            return true;
        }

        /// <summary>
        /// Adds a CRL to the store.
        /// </summary>
        public void AddCRL(X509CRL crl)
        {
            if (crl == null)
            {
                throw new ArgumentNullException("crl");
            }

            X509Certificate2           issuer       = null;
            X509Certificate2Collection certificates = null;

            certificates = Enumerate().Result;
            foreach (X509Certificate2 certificate in certificates)
            {
                if (Utils.CompareDistinguishedName(certificate.Subject, crl.Issuer))
                {
                    if (crl.VerifySignature(certificate, false))
                    {
                        issuer = certificate;
                        break;
                    }
                }
            }

            if (issuer == null)
            {
                throw new ServiceResultException(StatusCodes.BadCertificateInvalid, "Could not find issuer of the CRL.");
            }

            StringBuilder builder = new StringBuilder();

            builder.Append(m_directory.FullName);

            builder.Append(Path.DirectorySeparatorChar + "crl" + Path.DirectorySeparatorChar);
            builder.Append(GetFileName(issuer));
            builder.Append(".crl");

            FileInfo fileInfo = new FileInfo(builder.ToString());

            if (!fileInfo.Directory.Exists)
            {
                fileInfo.Directory.Create();
            }

            File.WriteAllBytes(fileInfo.FullName, crl.RawData);
        }