Creates an SSHA512 hash from the given cleartext and salt. If no salt is given, 4 random bytes are used. Derived from https://gist.github.com/itorres/2947088. The hashes generated by this function work with Dovecot, which is what is was written for.

ssha512.js

function ssha512(cleartext, salt) {
  ( typeof(salt) == 'undefined') ? salt = CryptoJS.lib.WordArray.random(4) : salt = CryptoJS.enc.Utf8.parse(salt);
  var plain = CryptoJS.enc.Utf8.parse(cleartext);
  var digest = CryptoJS.SHA512(plain.concat(salt));
  var ssha = '{SSHA512}' + digest.concat(salt).toString(CryptoJS.enc.Base64);
  return ssha;
}