133 lines
3.3 KiB
C#
133 lines
3.3 KiB
C#
/*
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KeePass Password Safe - The Open-Source Password Manager
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Copyright (C) 2003-2017 Dominik Reichl <dominik.reichl@t-online.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Diagnostics;
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using KeePassLib.Utility;
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namespace KeePassLib.Cryptography
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{
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public static class PopularPasswords
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{
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private static Dictionary<int, Dictionary<string, bool>> m_dicts =
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new Dictionary<int, Dictionary<string, bool>>();
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internal static int MaxLength
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{
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get
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{
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int iMaxLen = 0;
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foreach(int iLen in m_dicts.Keys)
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{
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if(iLen > iMaxLen) iMaxLen = iLen;
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}
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return iMaxLen;
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}
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}
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internal static bool ContainsLength(int nLength)
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{
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Dictionary<string, bool> dDummy;
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return m_dicts.TryGetValue(nLength, out dDummy);
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}
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public static bool IsPopularPassword(char[] vPassword)
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{
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ulong uDummy;
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return IsPopularPassword(vPassword, out uDummy);
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}
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public static bool IsPopularPassword(char[] vPassword, out ulong uDictSize)
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{
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if(vPassword == null) throw new ArgumentNullException("vPassword");
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if(vPassword.Length == 0) { uDictSize = 0; return false; }
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string str = new string(vPassword);
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try { return IsPopularPasswordPriv(str, out uDictSize); }
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catch(Exception) { Debug.Assert(false); }
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uDictSize = 0;
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return false;
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}
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private static bool IsPopularPasswordPriv(string str, out ulong uDictSize)
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{
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Debug.Assert(m_dicts.Count > 0); // Should be initialized with data
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Dictionary<string, bool> d;
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if(!m_dicts.TryGetValue(str.Length, out d))
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{
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uDictSize = 0;
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return false;
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}
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uDictSize = (ulong)d.Count;
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return d.ContainsKey(str);
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}
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public static void Add(byte[] pbData, bool bGZipped)
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{
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try
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{
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if(bGZipped)
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pbData = MemUtil.Decompress(pbData);
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string strData = StrUtil.Utf8.GetString(pbData, 0, pbData.Length);
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if(string.IsNullOrEmpty(strData)) { Debug.Assert(false); return; }
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if(!char.IsWhiteSpace(strData[strData.Length - 1]))
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strData += "\n";
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StringBuilder sb = new StringBuilder();
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for(int i = 0; i < strData.Length; ++i)
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{
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char ch = strData[i];
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if(char.IsWhiteSpace(ch))
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{
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int cc = sb.Length;
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if(cc > 0)
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{
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string strWord = sb.ToString();
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Debug.Assert(strWord.Length == cc);
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Dictionary<string, bool> d;
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if(!m_dicts.TryGetValue(cc, out d))
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{
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d = new Dictionary<string, bool>();
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m_dicts[cc] = d;
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}
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d[strWord] = true;
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sb.Remove(0, cc);
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}
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}
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else sb.Append(char.ToLower(ch));
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}
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}
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catch(Exception) { Debug.Assert(false); }
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}
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}
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}
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