NoSource JR + NoSource Solve

nosource_solve.js

var enc_key_jr = "nosource"; // -> "easyctf{" -> "soupy"
var enc_key = "heheheh!"; // -> "easyctf{" -> "hoo_hoo!"

var flag_nosource_jr = "Fg4GCRoHCQ4TFh0IBxENAE4qEgwHMBsfDiwJRQImHV8GQAwBDEYvV11BCA==";
var flag_nosource = "DQ4cJgsbCVofB18sNw4wRlhfCwAbXxpTC1wwKVlcGBIaUDAGJzowYDoqTiI=";

function process(a, b) {
    'use strict';
    var len = Math.max(a.length, b.length);
    var out = [];
    for (var i = 0, ca, cb; i < len; i++) {
      ca = a.charCodeAt(i % a.length);
      cb = b.charCodeAt(i % b.length);
      out.push(ca ^ cb);
    }
    return String.fromCharCode.apply(null, out);
}

function dec_flag(flag, boolean) {
  flag_tmp = atob(flag);
  
  if (boolean == 0)
    console.log(process(flag_tmp, enc_key_jr));
  else
    console.log(process(flag_tmp, enc_key))
}

dec_flag(flag_nosource_jr, 0);
dec_flag(flag_nosource, 1);