internal static void PrepareCharSet(PwCharSet pwCharSet, PwProfile pwProfile)
{
pwCharSet.Remove(PwCharSet.Invalid);
if (pwProfile.ExcludeLookAlike)
{
pwCharSet.Remove(PwCharSet.LookAlike);
}
if (pwProfile.ExcludeCharacters.Length > 0)
{
pwCharSet.Remove(pwProfile.ExcludeCharacters);
}
}
private void Initialize(bool bFullInitialize)
{
Clear();
if (!bFullInitialize)
{
return;
}
if (m_strHighAnsi == null)
{
StringBuilder sbHighAnsi = new StringBuilder();
// [U+0080, U+009F] are C1 control characters,
// U+00A0 is non-breaking space
for (char ch = '\u00A1'; ch <= '\u00AC'; ++ch)
{
sbHighAnsi.Append(ch);
}
// U+00AD is soft hyphen (format character)
for (char ch = '\u00AE'; ch < '\u00FF'; ++ch)
{
sbHighAnsi.Append(ch);
}
sbHighAnsi.Append('\u00FF');
m_strHighAnsi = sbHighAnsi.ToString();
}
if (m_strSpecial == null)
{
PwCharSet pcs = new PwCharSet(false);
pcs.AddRange('!', '/');
pcs.AddRange(':', '@');
pcs.AddRange('[', '`');
pcs.Add(@"|~");
pcs.Remove(@"-_ ");
pcs.Remove(PwCharSet.Brackets);
m_strSpecial = pcs.ToString();
}
}
internal static char GenerateCharacter(PwProfile pwProfile,
PwCharSet pwCharSet, CryptoRandomStream crsRandomSource)
{
if (pwCharSet.Size == 0)
{
return(char.MinValue);
}
ulong uIndex = crsRandomSource.GetRandomUInt64();
uIndex %= (ulong)pwCharSet.Size;
char ch = pwCharSet[(uint)uIndex];
if (pwProfile.NoRepeatingCharacters)
{
pwCharSet.Remove(ch);
}
return(ch);
}
internal static PwgError Generate(out ProtectedString psOut,
PwProfile pwProfile, CryptoRandomStream crsRandomSource)
{
psOut = ProtectedString.Empty;
LinkedList <char> vGenerated = new LinkedList <char>();
PwCharSet pcsCurrent = new PwCharSet();
PwCharSet pcsCustom = new PwCharSet();
PwCharSet pcsUsed = new PwCharSet();
bool bInCharSetDef = false;
string strPattern = ExpandPattern(pwProfile.Pattern);
if (strPattern.Length == 0)
{
return(PwgError.Success);
}
CharStream csStream = new CharStream(strPattern);
char ch = csStream.ReadChar();
while (ch != char.MinValue)
{
pcsCurrent.Clear();
bool bGenerateChar = false;
if (ch == '\\')
{
ch = csStream.ReadChar();
if (ch == char.MinValue) // Backslash at the end
{
vGenerated.AddLast('\\');
break;
}
if (bInCharSetDef)
{
pcsCustom.Add(ch);
}
else
{
vGenerated.AddLast(ch);
pcsUsed.Add(ch);
}
}
else if (ch == '^')
{
ch = csStream.ReadChar();
if (ch == char.MinValue) // ^ at the end
{
vGenerated.AddLast('^');
break;
}
if (bInCharSetDef)
{
pcsCustom.Remove(ch);
}
}
else if (ch == '[')
{
pcsCustom.Clear();
bInCharSetDef = true;
}
else if (ch == ']')
{
pcsCurrent.Add(pcsCustom.ToString());
bInCharSetDef = false;
bGenerateChar = true;
}
else if (bInCharSetDef)
{
if (pcsCustom.AddCharSet(ch) == false)
{
pcsCustom.Add(ch);
}
}
else if (pcsCurrent.AddCharSet(ch) == false)
{
vGenerated.AddLast(ch);
pcsUsed.Add(ch);
}
else
{
bGenerateChar = true;
}
if (bGenerateChar)
{
PwGenerator.PrepareCharSet(pcsCurrent, pwProfile);
if (pwProfile.NoRepeatingCharacters)
{
pcsCurrent.Remove(pcsUsed.ToString());
}
char chGen = PwGenerator.GenerateCharacter(pwProfile,
pcsCurrent, crsRandomSource);
if (chGen == char.MinValue)
{
return(PwgError.TooFewCharacters);
}
vGenerated.AddLast(chGen);
pcsUsed.Add(chGen);
}
ch = csStream.ReadChar();
}
if (vGenerated.Count == 0)
{
return(PwgError.Success);
}
char[] vArray = new char[vGenerated.Count];
vGenerated.CopyTo(vArray, 0);
if (pwProfile.PatternPermutePassword)
{
PwGenerator.ShufflePassword(vArray, crsRandomSource);
}
byte[] pbUtf8 = StrUtil.Utf8.GetBytes(vArray);
psOut = new ProtectedString(true, pbUtf8);
MemUtil.ZeroByteArray(pbUtf8);
Array.Clear(vArray, 0, vArray.Length);
vGenerated.Clear();
return(PwgError.Success);
}
