// ReSharper disable once InconsistentNaming
private static void CalulateL33tEntropy(L33tDictionaryMatch match)
{
// I'm a bit dubious about this function, but I have duplicated zxcvbn functionality regardless
var possibilities = 0;
foreach (var kvp in match.Subs)
{
var subbedChars = match.Token.Count(c => c == kvp.Key);
var unsubbedChars = match.Token.Count(c => c == kvp.Value); // Won't this always be zero?
possibilities += Enumerable.Range(0, Math.Min(subbedChars, unsubbedChars) + 1).Sum(i => (int)PasswordScoring.Binomial(subbedChars + unsubbedChars, i));
}
var entropy = Math.Log(possibilities, 2);
// In the case of only a single subsitution (e.g. 4pple) this would otherwise come out as zero, so give it one bit
match.L33tEntropy = (entropy < 1 ? 1 : entropy);
match.Entropy += match.L33tEntropy;
// We have to recalculate the uppercase entropy -- the password matcher will have used the subbed password not the original text
match.Entropy -= match.UppercaseEntropy;
match.UppercaseEntropy = PasswordScoring.CalculateUppercaseEntropy(match.Token);
match.Entropy += match.UppercaseEntropy;
}
private void CalulateL33tEntropy(L33tDictionaryMatch match)
{
// I'm a bit dubious about this function, but I have duplicated zxcvbn functionality regardless
var possibilities = 0;
foreach (var kvp in match.Subs)
{
var subbedChars = match.Token.Where(c => c == kvp.Key).Count();
var unsubbedChars = match.Token.Where(c => c == kvp.Value).Count(); // Won't this always be zero?
possibilities += Enumerable.Range(0, Math.Min(subbedChars, unsubbedChars) + 1).Sum(i => (int)PasswordScoring.Binomial(subbedChars + unsubbedChars, i));
}
var entropy = Math.Log(possibilities, 2);
// In the case of only a single subsitution (e.g. 4pple) this would otherwise come out as zero, so give it one bit
match.L33tEntropy = (entropy < 1 ? 1 : entropy);
match.Entropy += match.L33tEntropy;
// We have to recalculate the uppercase entropy -- the password matcher will have used the subbed password not the original text
match.Entropy -= match.UppercaseEntropy;
match.UppercaseEntropy = PasswordScoring.CalculateUppercaseEntropy(match.Token);
match.Entropy += match.UppercaseEntropy;
}
