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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2024 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.Security;
using System.Text;
#if !KeePassUAP
using System.Security.Cryptography;
#endif
using KeePassLib.Resources;
namespace KeePassLib.Cryptography.Cipher
{
public sealed class StandardAesEngine : ICipherEngine
{
#if !KeePassUAP
private const CipherMode SaeCipherMode = CipherMode.CBC;
private const PaddingMode SaePaddingMode = PaddingMode.PKCS7;
#endif
private static PwUuid g_uuidAes = null;
public static PwUuid AesUuid
{
get
{
PwUuid pu = g_uuidAes;
if(pu == null)
{
pu = new PwUuid(new byte[] {
0x31, 0xC1, 0xF2, 0xE6, 0xBF, 0x71, 0x43, 0x50,
0xBE, 0x58, 0x05, 0x21, 0x6A, 0xFC, 0x5A, 0xFF });
g_uuidAes = pu;
}
return pu;
}
}
public PwUuid CipherUuid
{
get { return StandardAesEngine.AesUuid; }
}
public string DisplayName
{
get
{
return ("AES/Rijndael (" + KLRes.KeyBits.Replace(@"{PARAM}",
"256") + ", FIPS 197)");
}
}
private static void ValidateArguments(Stream s, bool bEncrypt, byte[] pbKey, byte[] pbIV)
{
if(s == null) { Debug.Assert(false); throw new ArgumentNullException("s"); }
if(pbKey == null) { Debug.Assert(false); throw new ArgumentNullException("pbKey"); }
if(pbKey.Length != 32) { Debug.Assert(false); throw new ArgumentOutOfRangeException("pbKey"); }
if(pbIV == null) { Debug.Assert(false); throw new ArgumentNullException("pbIV"); }
if(pbIV.Length != 16) { Debug.Assert(false); throw new ArgumentOutOfRangeException("pbIV"); }
if(bEncrypt)
{
Debug.Assert(s.CanWrite);
if(!s.CanWrite) throw new ArgumentException("Stream must be writable!");
}
else // Decrypt
{
Debug.Assert(s.CanRead);
if(!s.CanRead) throw new ArgumentException("Stream must be readable!");
}
}
private static Stream CreateStream(Stream s, bool bEncrypt, byte[] pbKey, byte[] pbIV)
{
StandardAesEngine.ValidateArguments(s, bEncrypt, pbKey, pbIV);
#if KeePassUAP
return StandardAesEngineExt.CreateStream(s, bEncrypt, pbKey, pbIV);
#else
SymmetricAlgorithm a = CryptoUtil.CreateAes();
if(a.BlockSize != 128) // AES block size
{
Debug.Assert(false);
a.BlockSize = 128;
}
a.KeySize = 256;
a.Mode = SaeCipherMode;
a.Padding = SaePaddingMode;
ICryptoTransform t;
if(bEncrypt) t = a.CreateEncryptor(pbKey, pbIV);
else t = a.CreateDecryptor(pbKey, pbIV);
if(t == null) { Debug.Assert(false); throw new SecurityException("Unable to create AES transform!"); }
return new CryptoStreamEx(s, t, bEncrypt ? CryptoStreamMode.Write :
CryptoStreamMode.Read, a);
#endif
}
public Stream EncryptStream(Stream s, byte[] pbKey, byte[] pbIV)
{
return StandardAesEngine.CreateStream(s, true, pbKey, pbIV);
}
public Stream DecryptStream(Stream s, byte[] pbKey, byte[] pbIV)
{
return StandardAesEngine.CreateStream(s, false, pbKey, pbIV);
}
}
}
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