iTextSharp.text.pdf.PdfEncryption.ComputeUserPassword C# (CSharp) Метод

        public byte[] ComputeUserPassword(byte[] ownerPassword)
        {
            byte[] userPad = ComputeOwnerKey(ownerKey, PadPassword(ownerPassword));
            for (int i = 0; i < userPad.Length; i++) {
            bool match = true;
            for (int j = 0; j < userPad.Length - i; j++) {
                if (userPad[i + j] != pad[j]) {
                    match = false;
                    break;
                }
            }
            if (!match) continue;
            byte[] userPassword = new byte[i];
            System.Array.Copy(userPad, 0, userPassword, 0, i);
            return userPassword;
            }
            return userPad;
        }