147 lines
4.4 KiB
C#
147 lines
4.4 KiB
C#
/*
|
|
KeePass Password Safe - The Open-Source Password Manager
|
|
Copyright (C) 2003-2016 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.Security;
|
|
using System.Diagnostics;
|
|
|
|
#if !KeePassUAP
|
|
using System.Security.Cryptography;
|
|
#endif
|
|
|
|
using KeePassLib.Resources;
|
|
|
|
namespace KeePassLib.Cryptography.Cipher
|
|
{
|
|
/// <summary>
|
|
/// Standard AES cipher implementation.
|
|
/// </summary>
|
|
public sealed class StandardAesEngine : ICipherEngine
|
|
{
|
|
#if !KeePassUAP
|
|
private const CipherMode m_rCipherMode = CipherMode.CBC;
|
|
private const PaddingMode m_rCipherPadding = PaddingMode.PKCS7;
|
|
#endif
|
|
|
|
private static PwUuid m_uuidAes = null;
|
|
|
|
/// <summary>
|
|
/// UUID of the cipher engine. This ID uniquely identifies the
|
|
/// AES engine. Must not be used by other ciphers.
|
|
/// </summary>
|
|
public static PwUuid AesUuid
|
|
{
|
|
get
|
|
{
|
|
if(m_uuidAes == null)
|
|
m_uuidAes = new PwUuid(new byte[]{
|
|
0x31, 0xC1, 0xF2, 0xE6, 0xBF, 0x71, 0x43, 0x50,
|
|
0xBE, 0x58, 0x05, 0x21, 0x6A, 0xFC, 0x5A, 0xFF });
|
|
|
|
return m_uuidAes;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Get the UUID of this cipher engine as <c>PwUuid</c> object.
|
|
/// </summary>
|
|
public PwUuid CipherUuid
|
|
{
|
|
get { return StandardAesEngine.AesUuid; }
|
|
}
|
|
|
|
/// <summary>
|
|
/// Get a displayable name describing this cipher engine.
|
|
/// </summary>
|
|
public string DisplayName { get { return KLRes.EncAlgorithmAes; } }
|
|
|
|
private static void ValidateArguments(Stream stream, bool bEncrypt, byte[] pbKey, byte[] pbIV)
|
|
{
|
|
Debug.Assert(stream != null); if(stream == null) throw new ArgumentNullException("stream");
|
|
|
|
Debug.Assert(pbKey != null); if(pbKey == null) throw new ArgumentNullException("pbKey");
|
|
Debug.Assert(pbKey.Length == 32);
|
|
if(pbKey.Length != 32) throw new ArgumentException("Key must be 256 bits wide!");
|
|
|
|
Debug.Assert(pbIV != null); if(pbIV == null) throw new ArgumentNullException("pbIV");
|
|
Debug.Assert(pbIV.Length == 16);
|
|
if(pbIV.Length != 16) throw new ArgumentException("Initialization vector must be 128 bits wide!");
|
|
|
|
if(bEncrypt)
|
|
{
|
|
Debug.Assert(stream.CanWrite);
|
|
if(!stream.CanWrite) throw new ArgumentException("Stream must be writable!");
|
|
}
|
|
else // Decrypt
|
|
{
|
|
Debug.Assert(stream.CanRead);
|
|
if(!stream.CanRead) throw new ArgumentException("Encrypted stream must be readable!");
|
|
}
|
|
}
|
|
|
|
private static Stream CreateStream(Stream s, bool bEncrypt, byte[] pbKey, byte[] pbIV)
|
|
{
|
|
StandardAesEngine.ValidateArguments(s, bEncrypt, pbKey, pbIV);
|
|
|
|
byte[] pbLocalIV = new byte[16];
|
|
Array.Copy(pbIV, pbLocalIV, 16);
|
|
|
|
byte[] pbLocalKey = new byte[32];
|
|
Array.Copy(pbKey, pbLocalKey, 32);
|
|
|
|
#if KeePassUAP
|
|
return StandardAesEngineExt.CreateStream(s, bEncrypt, pbLocalKey, pbLocalIV);
|
|
#else
|
|
RijndaelManaged r = new RijndaelManaged();
|
|
if(r.BlockSize != 128) // AES block size
|
|
{
|
|
Debug.Assert(false);
|
|
r.BlockSize = 128;
|
|
}
|
|
|
|
r.IV = pbLocalIV;
|
|
r.KeySize = 256;
|
|
r.Key = pbLocalKey;
|
|
r.Mode = m_rCipherMode;
|
|
r.Padding = m_rCipherPadding;
|
|
|
|
ICryptoTransform iTransform = (bEncrypt ? r.CreateEncryptor() : r.CreateDecryptor());
|
|
Debug.Assert(iTransform != null);
|
|
if(iTransform == null) throw new SecurityException("Unable to create Rijndael transform!");
|
|
|
|
return new CryptoStream(s, iTransform, bEncrypt ? CryptoStreamMode.Write :
|
|
CryptoStreamMode.Read);
|
|
#endif
|
|
}
|
|
|
|
public Stream EncryptStream(Stream sPlainText, byte[] pbKey, byte[] pbIV)
|
|
{
|
|
return StandardAesEngine.CreateStream(sPlainText, true, pbKey, pbIV);
|
|
}
|
|
|
|
public Stream DecryptStream(Stream sEncrypted, byte[] pbKey, byte[] pbIV)
|
|
{
|
|
return StandardAesEngine.CreateStream(sEncrypted, false, pbKey, pbIV);
|
|
}
|
|
}
|
|
}
|