modernkeepasslib/ModernKeePassLib/Cryptography/CryptoStreamEx.cs

/*
  KeePass Password Safe - The Open-Source Password Manager
  Copyright (C) 2003-2019 Dominik Reichl <dominik.reichl@t-online.de>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;

#if !KeePassUAP
using System.Security.Cryptography;

namespace ModernKeePassLib.Cryptography
{
    public sealed class CryptoStreamEx : CryptoStream
    {
        private ICryptoTransform m_t;
        private SymmetricAlgorithm m_a;

        public CryptoStreamEx(Stream s, ICryptoTransform t, CryptoStreamMode m,
            SymmetricAlgorithm a) : base(s, t, m)
        {
            m_t = t;
            m_a = a;
        }

        protected override void Dispose(bool disposing)
        {
            try { base.Dispose(disposing); }
            // Unnecessary exception from CryptoStream with
            // RijndaelManagedTransform when a stream hasn't been
            // read completely (e.g. incorrect master key)
            catch (CryptographicException) { }
            catch (Exception) { Debug.Assert(false); }

            if (disposing)
            {
                try { if (m_t != null) { m_t.Dispose(); m_t = null; } }
                catch (Exception) { Debug.Assert(false); }

                // In .NET 2.0, SymmetricAlgorithm.Dispose() is not public
                try { if (m_a != null) { m_a.Clear(); m_a = null; } }
                catch (Exception) { Debug.Assert(false); }
            }
        }
    }
}
#endif