Initial QSfera import

Server/vendor/github.com/trustelem/zxcvbn/zxcvbn.go

@@ -0,0 +1,36 @@
+package zxcvbn
+
+import (
+	"github.com/trustelem/zxcvbn/match"
+	"time"
+	"unicode/utf8"
+
+	"github.com/trustelem/zxcvbn/matching"
+	"github.com/trustelem/zxcvbn/scoring"
+)
+
+type Result struct {
+	Guesses  float64
+	Sequence []*match.Match
+	Score    int
+	CalcTime float64
+}
+
+func PasswordStrength(password string, userInputs []string) Result {
+	start := time.Now()
+	var result Result
+	if !utf8.ValidString(password) {
+		// Do not evaluate passwords containing invalid utf8
+		// => those will be reported as weak passwords
+		return result
+	}
+	matches := matching.Omnimatch(password, userInputs)
+	seq := scoring.MostGuessableMatchSequence(password, matches, false)
+	end := time.Now()
+	calcTime := end.Nanosecond() - start.Nanosecond()
+	result.CalcTime = round(float64(calcTime)*time.Nanosecond.Seconds(), .5, 3)
+	result.Sequence = seq.Sequence
+	result.Guesses = seq.Guesses
+	result.Score = guessesToScore(seq.Guesses)
+	return result
+}