Setup solution

ModernKeePassLib/Cryptography/PasswordGenerator/CharSetBasedGenerator.cs

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+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2019 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.Text;
+
+using ModernKeePassLib.Security;
+using ModernKeePassLib.Utility;
+
+namespace ModernKeePassLib.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());
+			PwGenerator.PrepareCharSet(pcs, pwProfile);
+
+			char[] v = new char[pwProfile.Length];
+			try
+			{
+				for(int i = 0; i < v.Length; ++i)
+				{
+					char ch = PwGenerator.GenerateCharacter(pwProfile,
+						pcs, crsRandomSource);
+
+					if(ch == char.MinValue)
+						return PwgError.TooFewCharacters;
+
+					v[i] = ch;
+				}
+
+				byte[] pbUtf8 = StrUtil.Utf8.GetBytes(v);
+				psOut = new ProtectedString(true, pbUtf8);
+				MemUtil.ZeroByteArray(pbUtf8);
+			}
+			finally { MemUtil.ZeroArray<char>(v); }
+
+			return PwgError.Success;
+		}
+	}
+}