Opc.Ua.Win32.CryptDecodeObjectEx C# (CSharp) Method

        public static extern int CryptDecodeObjectEx(
            int dwCertEncodingType,
            IntPtr lpszStructType,
            IntPtr pbEncoded,
            int cbEncoded,
            int dwFlags,
            IntPtr pDecodePara,
            IntPtr pvStructInfo,
            ref int pcbStructInfo);

        /// <summary>
        /// Decodes a CERT_INFO.
        /// </summary>
        public static CRL_INFO Decode_CERT_INFO(IntPtr pEncoded, int iEncodedSize)
        {
            IntPtr pData2      = IntPtr.Zero;
            int    dwDataSize2 = 0;

            try
            {
                // calculate amount of memory required.
                int bResult = Win32.CryptDecodeObjectEx(
                    Win32.X509_ASN_ENCODING | Win32.PKCS_7_ASN_ENCODING,
                    (IntPtr)Win32.X509_CERT_CRL_TO_BE_SIGNED,
                    pEncoded,
                    iEncodedSize,
                    Win32.CRYPT_DECODE_NOCOPY_FLAG,
                    IntPtr.Zero,
                    pData2,
                    ref dwDataSize2);

                if (bResult == 0)
                {
                    throw GetLastError(StatusCodes.BadDecodingError, "Could not get size for CRL_INFO.");
                }

                // allocate memory.
                pData2 = Marshal.AllocHGlobal(dwDataSize2);

                // decode blob.
                bResult = Win32.CryptDecodeObjectEx(
                    Win32.X509_ASN_ENCODING | Win32.PKCS_7_ASN_ENCODING,
                    (IntPtr)Win32.X509_CERT_CRL_TO_BE_SIGNED,
                    pEncoded,
                    iEncodedSize,
                    Win32.CRYPT_DECODE_NOCOPY_FLAG,
                    IntPtr.Zero,
                    pData2,
                    ref dwDataSize2);

                if (bResult == 0)
                {
                    throw GetLastError(StatusCodes.BadDecodingError, "Could not decode CRL_INFO.");
                }

                return((Win32.CRL_INFO)Marshal.PtrToStructure(pData2, typeof(Win32.CRL_INFO)));
            }
            finally
            {
                if (pData2 != IntPtr.Zero)
                {
                    Marshal.FreeHGlobal(pData2);
                }
            }
        }