internal static (double, double, string) StrengthChecker(string data)
{
if (_estimator == null)
{
_estimator = new ZxcvbnEstimator();
}
if (string.IsNullOrEmpty(data))
{
return(0, 0, string.Empty);
}
string strength = null;
var result = _estimator.EstimateStrength(data);
var calc = Math.Log(result.Guesses) / Math.Log(10);
if (calc < AppConstants.AccStrengthVeryWeak)
{
strength = "VERY_WEAK";
}
else if (calc < AppConstants.AccStrengthWeak)
{
strength = "WEAK";
}
else if (calc < AppConstants.AccStrengthSomeWhatSecure)
{
strength = "SOMEWHAT_SECURE";
}
else if (calc >= AppConstants.AccStrengthSomeWhatSecure)
{
strength = "SECURE";
}
double percentage = Math.Round(Math.Min((calc / 16) * 100, 100));
return(calc, percentage, strength);
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
string password = value as string;
if (string.IsNullOrEmpty(password))
{
return(new ValidationResult("Password can't be empty."));
}
var estimator = new ZxcvbnEstimator();
var result = estimator.EstimateStrength(password);
if (result.Score < 3)
{
string warning = !string.IsNullOrWhiteSpace(result.Feedback.Warning)
? " " + result.Feedback.Warning.TrimEnd('.') + "."
: "";
string suggestions = string.Join(" ", result.Feedback.Suggestions.Where(s => !string.IsNullOrWhiteSpace(s)).Select(s => s.TrimEnd('.') + "."));
if (!string.IsNullOrWhiteSpace(suggestions))
{
suggestions = " " + suggestions;
}
return(new ValidationResult(string.Join("", "Password is not strong enough.", warning, suggestions)));
}
return(ValidationResult.Success);
}
/// <summary>
/// Demo of Dot net wrapper for zxcvbn Password strength library for dot net
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
Console.Write("Enter Password : "******"____________________\n\n");
var estimator = new ZxcvbnEstimator();
var result = estimator.EstimateStrength(password);
Console.WriteLine(result.Password);
Console.WriteLine("____________________\n\n");
Console.WriteLine(result.Score);
Console.WriteLine(result.CalcTime);
//Console.WriteLine(result.CrackTimesDisplay);
//Console.WriteLine(result.CrackTimesSeconds);
Console.WriteLine(result.Feedback);
Console.WriteLine(result.Guesses);
Console.WriteLine(result.GuessesLog10);
Console.WriteLine(result.Sequence);
if (result.Score < 3)
{
Console.WriteLine("Password is not strong enough");
Console.WriteLine(result.Feedback.Warning);
Console.WriteLine(string.Join(Environment.NewLine, result.Feedback.Suggestions));
}
Console.ReadKey();
}
internal static StrengthIndicator StrengthChecker(string data)
{
if (_estimator == null)
{
_estimator = new ZxcvbnEstimator();
}
var strengthIndicator = new StrengthIndicator();
if (string.IsNullOrEmpty(data))
{
throw new Exception("Can't check strength for empty string.");
}
var result = _estimator.EstimateStrength(data);
strengthIndicator.Guesses = Math.Log(result.Guesses) / Math.Log(10);
if (strengthIndicator.Guesses < Constants.StrengthScoreVeryWeak)
{
strengthIndicator.Strength = Constants.StrengthVeryWeak;
}
else if (strengthIndicator.Guesses < Constants.StrengthScoreWeak)
{
strengthIndicator.Strength = Constants.StrengthWeak;
}
else if (strengthIndicator.Guesses < Constants.StrengthScoreSomeWhatSecure)
{
strengthIndicator.Strength = Constants.StrengthSomewhatSecure;
}
else if (strengthIndicator.Guesses >= Constants.StrengthScoreSomeWhatSecure)
{
strengthIndicator.Strength = Constants.StrengthSecure;
}
strengthIndicator.Percentage = Math.Round(Math.Min((strengthIndicator.Guesses / 16) * 100, 100));
return(strengthIndicator);
}
