iTextSharp.text.pdf.PdfPKCS7.GetExtensionValue C# (CSharp) Метод

        private static Asn1Object GetExtensionValue(X509Certificate cert, String oid) {
            byte[] bytes = cert.GetExtensionValue(new DerObjectIdentifier(oid)).GetDerEncoded();
            if (bytes == null) {
                return null;
            }
            Asn1InputStream aIn = new Asn1InputStream(new MemoryStream(bytes));
            Asn1OctetString octs = (Asn1OctetString) aIn.ReadObject();
            aIn = new Asn1InputStream(new MemoryStream(octs.GetOctets()));
            return aIn.ReadObject();
        }