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

        public void Update(byte[] buf, int off, int len) {
            if (RSAdata != null || digestAttr != null)
                messageDigest.BlockUpdate(buf, off, len);
            else
                sig.BlockUpdate(buf, off, len);
        }
        

 private void UpdateByteRange(PdfPKCS7 pkcs7, PdfDictionary v)
 {
     PdfArray b = v.GetAsArray(PdfName.BYTERANGE);
     RandomAccessFileOrArray rf = reader.SafeFile;
     try {
         rf.ReOpen();
         byte[] buf = new byte[8192];
         for (int k = 0; k < b.Size; ++k) {
             int start = b.GetAsNumber(k).IntValue;
             int length = b.GetAsNumber(++k).IntValue;
             rf.Seek(start);
             while (length > 0) {
                 int rd = rf.Read(buf, 0, Math.Min(length, buf.Length));
                 if (rd <= 0)
                     break;
                 length -= rd;
                 pkcs7.Update(buf, 0, rd);
             }
         }
     }
     finally {
         try{rf.Close();}catch{}
     }
 }