сегодня

День рождения Эмми Нётер. 

wtf

private val digest = MessageDigest.getInstance("MD5")
def md5(message: String): String = {
  val bytes = message.getBytes("UTF-8")
  digest.reset()
  val code1 = ("" /: digest.digest(bytes))(_ + encode(_))
  digest.reset()
  val code2 = ("" /: digest.digest(bytes))(_ + encode(_))
  digest.reset()
  val code3 = ("" /: digest.digest(bytes))(_ + encode(_))
  code3  
}

gives me

message = "a"
bytes = {byte[1]@3305} [97]
code1 = "4k1z3161463m1w5h4f5gn635a4j1u6i"
code2 = "c5d39555c6p524o1d5f496a2x3b122p"
code3 = "n2n4mb6v1j4g2p2s4p3c182k4aq4y"

P.S. THE ANSWER: it should be synchronized.