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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.Diagnostics;
using System.IO;
using System.Security;
using System.Text;
using KeePassLib.Cryptography;
using KeePassLib.Resources;
using KeePassLib.Security;
using KeePassLib.Serialization;
using KeePassLib.Utility;
namespace KeePassLib.Keys
{
public sealed class KcpKeyFile : IUserKey
{
private readonly string m_strPath;
private readonly ProtectedBinary m_pbKeyData;
public string Path
{
get { return m_strPath; }
}
public ProtectedBinary KeyData
{
get { return m_pbKeyData; }
}
public KcpKeyFile(string strKeyFile) :
this(IOConnectionInfo.FromPath(strKeyFile), false)
{
}
public KcpKeyFile(string strKeyFile, bool bThrowIfDbFile) :
this(IOConnectionInfo.FromPath(strKeyFile), bThrowIfDbFile)
{
}
public KcpKeyFile(IOConnectionInfo iocKeyFile) :
this(iocKeyFile, false)
{
}
public KcpKeyFile(IOConnectionInfo iocKeyFile, bool bThrowIfDbFile)
{
if(iocKeyFile == null) throw new ArgumentNullException("iocKeyFile");
byte[] pbFileData;
using(Stream s = IOConnection.OpenRead(iocKeyFile))
{
pbFileData = MemUtil.Read(s);
}
if(pbFileData == null) throw new IOException();
if(bThrowIfDbFile && (pbFileData.Length >= 8))
{
uint uSig1 = MemUtil.BytesToUInt32(MemUtil.Mid(pbFileData, 0, 4));
uint uSig2 = MemUtil.BytesToUInt32(MemUtil.Mid(pbFileData, 4, 4));
if(((uSig1 == KdbxFile.FileSignature1) &&
(uSig2 == KdbxFile.FileSignature2)) ||
((uSig1 == KdbxFile.FileSignaturePreRelease1) &&
(uSig2 == KdbxFile.FileSignaturePreRelease2)) ||
((uSig1 == KdbxFile.FileSignatureOld1) &&
(uSig2 == KdbxFile.FileSignatureOld2)))
#if KeePassLibSD
throw new Exception(KLRes.KeyFileDbSel);
#else
throw new InvalidDataException(KLRes.KeyFileDbSel);
#endif
}
byte[] pbKey = LoadKeyFile(pbFileData);
m_strPath = iocKeyFile.Path;
m_pbKeyData = new ProtectedBinary(true, pbKey);
MemUtil.ZeroByteArray(pbKey);
MemUtil.ZeroByteArray(pbFileData);
}
private static byte[] LoadKeyFile(byte[] pbFileData)
{
if(pbFileData == null) throw new ArgumentNullException("pbFileData");
byte[] pbKey = LoadKeyFileXml(pbFileData);
if(pbKey != null) return pbKey;
int cb = pbFileData.Length;
if(cb == 32) return pbFileData;
if(cb == 64)
{
pbKey = LoadKeyFileHex(pbFileData);
if(pbKey != null) return pbKey;
}
return CryptoUtil.HashSha256(pbFileData);
}
private static byte[] LoadKeyFileXml(byte[] pbFileData)
{
KfxFile kf;
try
{
using(MemoryStream ms = new MemoryStream(pbFileData, false))
{
kf = KfxFile.Load(ms);
}
}
catch(Exception) { return null; }
// We have a syntactically valid XML key file;
// failing to verify the key should throw an exception
return ((kf != null) ? kf.GetKey() : null);
}
private static byte[] LoadKeyFileHex(byte[] pbFileData)
{
if(pbFileData == null) { Debug.Assert(false); return null; }
try
{
int cc = pbFileData.Length;
if((cc & 1) != 0) { Debug.Assert(false); return null; }
if(!StrUtil.IsHexString(pbFileData, true)) return null;
string strHex = StrUtil.Utf8.GetString(pbFileData);
return MemUtil.HexStringToByteArray(strHex);
}
catch(Exception) { Debug.Assert(false); }
return null;
}
public static void Create(string strFilePath, byte[] pbAdditionalEntropy)
{
Create(strFilePath, pbAdditionalEntropy, 0);
}
internal static void Create(string strFilePath, byte[] pbAdditionalEntropy,
ulong uVersion)
{
byte[] pbRandom = CryptoRandom.Instance.GetRandomBytes(32);
if((pbRandom == null) || (pbRandom.Length != 32))
throw new SecurityException();
byte[] pbKey;
if((pbAdditionalEntropy == null) || (pbAdditionalEntropy.Length == 0))
pbKey = pbRandom;
else
{
int cbAdd = pbAdditionalEntropy.Length;
int cbRnd = pbRandom.Length;
byte[] pbCmp = new byte[cbAdd + cbRnd];
Array.Copy(pbAdditionalEntropy, 0, pbCmp, 0, cbAdd);
Array.Copy(pbRandom, 0, pbCmp, cbAdd, cbRnd);
pbKey = CryptoUtil.HashSha256(pbCmp);
MemUtil.ZeroByteArray(pbCmp);
}
KfxFile kf = KfxFile.Create(uVersion, pbKey, null);
IOConnectionInfo ioc = IOConnectionInfo.FromPath(strFilePath);
using(Stream s = IOConnection.OpenWrite(ioc))
{
kf.Save(s);
}
MemUtil.ZeroByteArray(pbKey);
MemUtil.ZeroByteArray(pbRandom);
}
}
}
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