Initial QSfera import

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

@@ -0,0 +1,38 @@
+package matching
+
+import (
+	"github.com/trustelem/zxcvbn/match"
+)
+
+type reverseDictionnaryMatch struct {
+	dm dictionaryMatch
+}
+
+func (rdm reverseDictionnaryMatch) Matches(password string) []*match.Match {
+	reversedPassword := reverse(password)
+	matches := rdm.dm.Matches(reversedPassword)
+	for _, m := range matches {
+		m.Token = reverse(m.Token)
+		m.Reversed = true
+		m.I, m.J = len(password)-1-m.J, len(password)-1-m.I
+	}
+	match.Sort(matches)
+	return matches
+}
+
+func reverse(input string) string {
+	// Get Unicode code points.
+	n := 0
+	rune := make([]rune, len(input))
+	for _, r := range input {
+		rune[n] = r
+		n++
+	}
+	rune = rune[0:n]
+	// Reverse
+	for i := 0; i < n/2; i++ {
+		rune[i], rune[n-1-i] = rune[n-1-i], rune[i]
+	}
+	// Convert back to UTF-8.
+	return string(rune)
+}