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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2012 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.Text;
using System.IO;
using System.Diagnostics;
using System.Security;
using System.Security.Cryptography;
namespace KeePassLib.Cryptography.Cipher
{
/// <summary>
/// Pool of encryption/decryption algorithms (ciphers).
/// </summary>
public sealed class CipherPool
{
private List<ICipherEngine> m_vCiphers = new List<ICipherEngine>();
private static CipherPool m_poolGlobal = null;
/// <summary>
/// Reference to the global cipher pool.
/// </summary>
public static CipherPool GlobalPool
{
get
{
if(m_poolGlobal != null) return m_poolGlobal;
m_poolGlobal = new CipherPool();
m_poolGlobal.AddCipher(new StandardAesEngine());
return m_poolGlobal;
}
}
/// <summary>
/// Remove all cipher engines from the current pool.
/// </summary>
public void Clear()
{
m_vCiphers.Clear();
}
/// <summary>
/// Add a cipher engine to the pool.
/// </summary>
/// <param name="csEngine">Cipher engine to add. Must not be <c>null</c>.</param>
public void AddCipher(ICipherEngine csEngine)
{
Debug.Assert(csEngine != null);
if(csEngine == null) throw new ArgumentNullException("csEngine");
// Return if a cipher with that ID is registered already.
for(int i = 0; i < m_vCiphers.Count; ++i)
if(m_vCiphers[i].CipherUuid.EqualsValue(csEngine.CipherUuid))
return;
m_vCiphers.Add(csEngine);
}
/// <summary>
/// Get a cipher identified by its UUID.
/// </summary>
/// <param name="uuidCipher">UUID of the cipher to return.</param>
/// <returns>Reference to the requested cipher. If the cipher is
/// not found, <c>null</c> is returned.</returns>
public ICipherEngine GetCipher(PwUuid uuidCipher)
{
foreach(ICipherEngine iEngine in m_vCiphers)
{
if(iEngine.CipherUuid.EqualsValue(uuidCipher))
return iEngine;
}
return null;
}
/// <summary>
/// Get the index of a cipher. This index is temporary and should
/// not be stored or used to identify a cipher.
/// </summary>
/// <param name="uuidCipher">UUID of the cipher.</param>
/// <returns>Index of the requested cipher. Returns <c>-1</c> if
/// the specified cipher is not found.</returns>
public int GetCipherIndex(PwUuid uuidCipher)
{
for(int i = 0; i < m_vCiphers.Count; ++i)
{
if(m_vCiphers[i].CipherUuid.EqualsValue(uuidCipher))
return i;
}
Debug.Assert(false);
return -1;
}
/// <summary>
/// Get the index of a cipher. This index is temporary and should
/// not be stored or used to identify a cipher.
/// </summary>
/// <param name="strDisplayName">Name of the cipher. Note that
/// multiple ciphers can have the same name. In this case, the
/// first matching cipher is returned.</param>
/// <returns>Cipher with the specified name or <c>-1</c> if
/// no cipher with that name is found.</returns>
public int GetCipherIndex(string strDisplayName)
{
for(int i = 0; i < m_vCiphers.Count; ++i)
if(m_vCiphers[i].DisplayName == strDisplayName)
return i;
Debug.Assert(false);
return -1;
}
/// <summary>
/// Get the number of cipher engines in this pool.
/// </summary>
public int EngineCount
{
get { return m_vCiphers.Count; }
}
/// <summary>
/// Get the cipher engine at the specified position. Throws
/// an exception if the index is invalid. You can use this
/// to iterate over all ciphers, but do not use it to
/// identify ciphers.
/// </summary>
/// <param name="nIndex">Index of the requested cipher engine.</param>
/// <returns>Reference to the cipher engine at the specified
/// position.</returns>
public ICipherEngine this[int nIndex]
{
get
{
if((nIndex < 0) || (nIndex >= m_vCiphers.Count))
throw new ArgumentOutOfRangeException("nIndex");
return m_vCiphers[nIndex];
}
}
}
}
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