var cip_e = function(x, k) {
    var ss = [];
    for(var i = 0; i < x.length; i++) {
        ss[i] = x.charCodeAt(i)^k.charCodeAt(i);
    }
    return ss;
}

var cip_d = function(xa, k) {
    var r = "";
    for(var i = 0; i < xa.length; i++) {
        r += String.fromCharCode(xa[i]^k.charCodeAt(i));
    }
    return r;
}