finish OTP code

otp.go

@@ -14,11 +14,19 @@ func (s *OpenVpnMgt) GenerateOTP(user string) ([]string, error) {
 // }
 
 func (s *OpenVpnMgt) TokenPassword(c *vpnSession) (bool, string) {
-	//TODO implement that correcly
-	if c.password == "maith1wiePuw3ieb4heiNie5y" {
-		return true, "maith1wiePuw3ieb4heiNie5y"
+	now := time.Now().Unix()
+	if len(c.password) > 40 {
+		salt := c.password[:4]
+		for i := 0; i < 3; i++ {
+			test := encode64(ComputeHmac256(c.baseHash(salt, now/30-int64(i)), s.otpMasterSecrets[0]))
+			if salt+test == c.password {
+				return true, c.password
+			}
+		}
 	}
-	return false, "maith1wiePuw3ieb4heiNie5y"
+
+	salt := NewSalt()
+	return false, salt + encode64(ComputeHmac256(c.baseHash(salt, now/30), s.otpMasterSecrets[0]))
 }
 
 func (s *OpenVpnMgt) GenerateOTPGeneric(user string, period int, algo string, secretLen int, digits int) ([]string, error) {