Remove unused VNC authentication utilities.

lib/util/vncauth.js

@@ -36,23 +36,6 @@ function encrypt(challenge, password) {
 
 module.exports.encrypt = encrypt
 
-function decrypt(challenge, password) {
-  var key = normalizePassword(password)
-    , iv = new Buffer(0).fill(0)
-
-  // Note: do not call .final(), .update() is the one that gives us the
-  // desired result.
-  return crypto.createDecipheriv('des-ecb', key, iv).update(challenge)
-}
-
-module.exports.decrypt = decrypt
-
-function format(fingerprint) {
-  return fingerprint.toString('hex').match(/\w{4}/g).join(':')
-}
-
-module.exports.format = format
-
 function verify(response, challenge, password) {
   return encrypt(challenge, password).equals(response)
 }