question: public RequestAuthenticator ( SecureRandom rand , String secret ) throws NoSuchAlgorithmException { final byte [ ] authenticator = new byte [ 16 ] ; rand . nextBytes ( authenticator ) ; final MessageDigest md5 = MessageDigest . getInstance ( "MD5" ) ; md5 . update ( authenticator ) ; md5 . update ( secret . getBytes ( StandardCharsets . UTF_8 ) ) ; octets = md5 . digest ( ) ; }
target:  Generates a request authenticator field consisting of a 16 octet random number per section 3 of RFC 2865.