2.js

function _n(key,a) {
    var b = "",
    e,
    c,
    h,
    f,
    g,
    d = 0,
    a = a.replace(/[^A-Za-z0-9\+\/\=]/g, "");
    64 == this.key.length && (this.key += "=");
    for (a += ["", "===", "==", "="][a.length % 4]; d < a.length;) e = key.indexOf(a.charAt(d++)),
    c = key.indexOf(a.charAt(d++)),
    f = key.indexOf(a.charAt(d++)),
    g = key.indexOf(a.charAt(d++)),
    e = e << 2 | c >> 4,
    c = (c & 15) << 4 | f >> 2,
    h = (f & 3) << 6 | g,
    b += String.fromCharCode(e),
    64 != f && (b += String.fromCharCode(c)),
    64 != g && (b += String.fromCharCode(h));
    return b
}