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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.Diagnostics;
using KeePassLib.Security;
using KeePassLib.Utility;
namespace KeePassLib.Cryptography.PasswordGenerator
{
internal static class CharSetBasedGenerator
{
internal static PwgError Generate(out ProtectedString psOut,
PwProfile pwProfile, CryptoRandomStream crsRandomSource)
{
psOut = ProtectedString.Empty;
if(pwProfile.Length == 0) return PwgError.Success;
PwCharSet pcs = new PwCharSet(pwProfile.CharSet.ToString());
char[] vGenerated = new char[pwProfile.Length];
PwGenerator.PrepareCharSet(pcs, pwProfile);
for(int nIndex = 0; nIndex < (int)pwProfile.Length; ++nIndex)
{
char ch = PwGenerator.GenerateCharacter(pwProfile, pcs,
crsRandomSource);
if(ch == char.MinValue)
{
Array.Clear(vGenerated, 0, vGenerated.Length);
return PwgError.TooFewCharacters;
}
vGenerated[nIndex] = ch;
}
byte[] pbUtf8 = StrUtil.Utf8.GetBytes(vGenerated);
psOut = new ProtectedString(true, pbUtf8);
MemUtil.ZeroByteArray(pbUtf8);
Array.Clear(vGenerated, 0, vGenerated.Length);
return PwgError.Success;
}
}
}
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