var encRawKey =  "4ea1...b2bf";
var encAlg = {
  name : "AES-GCM",
  params : {
    iv : hex2bin("534aea17"),
    additionalData: hex2bin("534aea17"),
    tagLength: 128
  }
};
function encrypt(text) {
  polycrypt.importKey("raw", hex2bin(encRawKey)).oncomplete = function(e) {
    var key = e.target.result;
    polycrypt.encrypt(encAlg, key,str2bin(text)).oncomplete = function(e) {
      var cipher = e.target.result;
      polycrypt.decrypt(encAlg, key, cipher).oncomplete = function(e) {
        console.log("encrypted: "+bin2str(cipher));
        console.log("decrypted: "+bin2str(e.target.result));
      };
    };
  };
}