public static PwgError Generate(out ProtectedString psOut,
PwProfile pwProfile, byte[] pbUserEntropy,
CustomPwGeneratorPool pwAlgorithmPool)
{
Debug.Assert(pwProfile != null);
if (pwProfile == null)
{
throw new ArgumentNullException("pwProfile");
}
CryptoRandomStream crs = CreateCryptoStream(pbUserEntropy);
PwgError e = PwgError.Unknown;
if (pwProfile.GeneratorType == PasswordGeneratorType.CharSet)
{
e = CharSetBasedGenerator.Generate(out psOut, pwProfile, crs);
}
else if (pwProfile.GeneratorType == PasswordGeneratorType.Pattern)
{
e = PatternBasedGenerator.Generate(out psOut, pwProfile, crs);
}
else if (pwProfile.GeneratorType == PasswordGeneratorType.Custom)
{
e = GenerateCustom(out psOut, pwProfile, crs, pwAlgorithmPool);
}
else
{
Debug.Assert(false); psOut = ProtectedString.Empty;
}
return(e);
}
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);
}
}
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);
}
private static PwgError GenerateCustom(out ProtectedString psOut,
PwProfile pwProfile, CryptoRandomStream crs,
CustomPwGeneratorPool pwAlgorithmPool)
{
psOut = ProtectedString.Empty;
Debug.Assert(pwProfile.GeneratorType == PasswordGeneratorType.Custom);
if (pwAlgorithmPool == null)
{
return(PwgError.UnknownAlgorithm);
}
string strID = pwProfile.CustomAlgorithmUuid;
if (string.IsNullOrEmpty(strID))
{
Debug.Assert(false); return(PwgError.UnknownAlgorithm);
}
byte[] pbUuid = Convert.FromBase64String(strID);
PwUuid uuid = new PwUuid(pbUuid);
CustomPwGenerator pwg = pwAlgorithmPool.Find(uuid);
if (pwg == null)
{
Debug.Assert(false); return(PwgError.UnknownAlgorithm);
}
ProtectedString pwd = pwg.Generate(pwProfile.CloneDeep(), crs);
if (pwd == null)
{
return(PwgError.Unknown);
}
psOut = pwd;
return(PwgError.Success);
}
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);
}
/// <summary>
/// Password generation function.
/// </summary>
/// <param name="prf">Password generation options chosen
/// by the user. This may be <c>null</c>, if the default
/// options should be used.</param>
/// <param name="crsRandomSource">Source that the algorithm
/// can use to generate random numbers.</param>
/// <returns>Generated password or <c>null</c> in case
/// of failure. If returning <c>null</c>, the caller assumes
/// that an error message has already been shown to the user.</returns>
public abstract ProtectedString Generate(PwProfile prf,
CryptoRandomStream crsRandomSource);
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);
}