/
decrypt.js
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/
decrypt.js
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function decryptaes(i, handler, numsegment) {
var e = function(e, t) {
if (!(e instanceof t)) throw new TypeError("Cannot call a class as a function")
};
var t = function() {
function e(e, t) {
for (var i = 0; i < t.length; i++) {
var n = t[i];
n.enumerable = n.enumerable || !1, n.configurable = !0, "value" in n && (n.writable = !0), Object.defineProperty(e, n.key, n)
}
}
return function(t, i, n) {
return i && e(t.prototype, i), n && e(t, n), t
}
}();
function n(e, t) {
if (!e) throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
return !t || "object" != typeof t && "function" != typeof t ? e : t
};
function r() {
var e = [
[
[],
[],
[],
[],
[]
],
[
[],
[],
[],
[],
[]
]
],
t = e[0],
i = e[1],
n = t[4],
r = i[4],
a = void 0,
s = void 0,
o = void 0,
u = [],
l = [],
c = void 0,
h = void 0,
d = void 0,
p = void 0,
f = void 0;
for (a = 0; a < 256; a++) l[(u[a] = a << 1 ^ 283 * (a >> 7)) ^ a] = a;
for (s = o = 0; !n[s]; s ^= c || 1, o = l[o] || 1)
for (d = (d = o ^ o << 1 ^ o << 2 ^ o << 3 ^ o << 4) >> 8 ^ 255 & d ^ 99, n[s] = d, r[d] = s, f = 16843009 * u[h = u[c = u[s]]] ^ 65537 * h ^ 257 * c ^ 16843008 * s, p = 257 * u[d] ^ 16843008 * d, a = 0; a < 4; a++) t[a][s] = p = p << 24 ^ p >>> 8, i[a][d] = f = f << 24 ^ f >>> 8;
for (a = 0; a < 5; a++) t[a] = t[a].slice(0), i[a] = i[a].slice(0);
return e
};
var a = null;
var s = function() {
function t(i) {
e(this, t), a || (a = r()), this._tables = [
[a[0][0].slice(), a[0][1].slice(), a[0][2].slice(), a[0][3].slice(), a[0][4].slice()],
[a[1][0].slice(), a[1][1].slice(), a[1][2].slice(), a[1][3].slice(), a[1][4].slice()]
];
var n = void 0,
s = void 0,
o = void 0,
u = void 0,
l = void 0,
c = this._tables[0][4],
h = this._tables[1],
d = i.length,
p = 1;
if (4 !== d && 6 !== d && 8 !== d) throw new Error("Invalid aes key size");
for (u = i.slice(0), l = [], this._key = [u, l], n = d; n < 4 * d + 28; n++) o = u[n - 1], (n % d == 0 || 8 === d && n % d == 4) && (o = c[o >>> 24] << 24 ^ c[o >> 16 & 255] << 16 ^ c[o >> 8 & 255] << 8 ^ c[255 & o], n % d == 0 && (o = o << 8 ^ o >>> 24 ^ p << 24, p = p << 1 ^ 283 * (p >> 7))), u[n] = u[n - d] ^ o;
for (s = 0; n; s++, n--) o = u[3 & s ? n : n - 4], l[s] = n <= 4 || s < 4 ? o : h[0][c[o >>> 24]] ^ h[1][c[o >> 16 & 255]] ^ h[2][c[o >> 8 & 255]] ^ h[3][c[255 & o]]
}
return t.prototype.decrypt = function(e, t, i, n, r, a) {
var s = this._key[1],
o = e ^ s[0],
u = n ^ s[1],
l = i ^ s[2],
c = t ^ s[3],
h = void 0,
d = void 0,
p = void 0,
f = s.length / 4 - 2,
m = void 0,
g = 4,
y = this._tables[1],
v = y[0],
_ = y[1],
b = y[2],
T = y[3],
S = y[4];
for (m = 0; m < f; m++) h = v[o >>> 24] ^ _[u >> 16 & 255] ^ b[l >> 8 & 255] ^ T[255 & c] ^ s[g], d = v[u >>> 24] ^ _[l >> 16 & 255] ^ b[c >> 8 & 255] ^ T[255 & o] ^ s[g + 1], p = v[l >>> 24] ^ _[c >> 16 & 255] ^ b[o >> 8 & 255] ^ T[255 & u] ^ s[g + 2], c = v[c >>> 24] ^ _[o >> 16 & 255] ^ b[u >> 8 & 255] ^ T[255 & l] ^ s[g + 3], g += 4, o = h, u = d, l = p;
for (m = 0; m < 4; m++) r[(3 & -m) + a] = S[o >>> 24] << 24 ^ S[u >> 16 & 255] << 16 ^ S[l >> 8 & 255] << 8 ^ S[255 & c] ^ s[g++], h = o, o = u, u = l, l = c, c = h
}, t
}();
var o = function() {
function t() {
e(this, t), this.listeners = {}
}
return t.prototype.on = function(e, t) {
this.listeners[e] || (this.listeners[e] = []), this.listeners[e].push(t)
}, t.prototype.off = function(e, t) {
if (!this.listeners[e]) return !1;
var i = this.listeners[e].indexOf(t);
return this.listeners[e].splice(i, 1), i > -1
}, t.prototype.trigger = function(e) {
var t = this.listeners[e];
if (t)
if (2 === arguments.length)
for (var i = t.length, n = 0; n < i; ++n) t[n].call(this, arguments[1]);
else
for (var r = Array.prototype.slice.call(arguments, 1), a = t.length, s = 0; s < a; ++s) t[s].apply(this, r)
}, t.prototype.dispose = function() {
this.listeners = {}
}, t.prototype.pipe = function(e) {
this.on("data", function(t) {
e.push(t)
})
}, t
}();
var u = function(t) {
function i() {
e(this, i);
var r = n(this, t.call(this, o));
return r.jobs = [], r.delay = 1, r.timeout_ = null, r
}
return function(e, t) {
if ("function" != typeof t && null !== t) throw new TypeError("Super expression must either be null or a function, not " + typeof t);
e.prototype = Object.create(t && t.prototype, {
constructor: {
value: e,
enumerable: !1,
writable: !0,
configurable: !0
}
}), t && (Object.setPrototypeOf ? Object.setPrototypeOf(e, t) : e.__proto__ = t)
}(i, t), i.prototype.processJob_ = function() {
this.jobs.shift()(), this.jobs.length ? this.timeout_ = setTimeout(this.processJob_.bind(this), this.delay) : this.timeout_ = null
}, i.prototype.push = function(e) {
this.jobs.push(e), this.timeout_ || (this.timeout_ = setTimeout(this.processJob_.bind(this), this.delay))
}, i
}(o);
var l = function(e) {
return e << 24 | (65280 & e) << 8 | (16711680 & e) >> 8 | e >>> 24
};
var c = function() {
function i(t, n, r, a) {
e(this, i);
var s = i.STEP,
o = new Int32Array(t.buffer),
c = new Uint8Array(t.byteLength),
h = 0;
for (this.asyncStream_ = new u, this.asyncStream_.push(this.decryptChunk_(o.subarray(h, h + s), n, r, c)), h = s; h < o.length; h += s) r = new Uint32Array([l(o[h - 4]), l(o[h - 3]), l(o[h - 2]), l(o[h - 1])]), this.asyncStream_.push(this.decryptChunk_(o.subarray(h, h + s), n, r, c));
this.asyncStream_.push(function() {
/* a((e = c).subarray(0, e.byteLength - e[e.byteLength - 1])) */
handler.on_segment_loaded(numsegment, (emit = c).subarray(0, emit.byteLength - emit[emit.byteLength - 1]));
})
}
return i.prototype.decryptChunk_ = function(e, t, i, n) {
return function() {
var r = function(e, t, i) {
var n = new Int32Array(e.buffer, e.byteOffset, e.byteLength >> 2),
r = new s(Array.prototype.slice.call(t)),
a = new Uint8Array(e.byteLength),
o = new Int32Array(a.buffer),
u = void 0,
c = void 0,
h = void 0,
d = void 0,
p = void 0,
f = void 0,
m = void 0,
g = void 0,
y = void 0;
for (u = i[0], c = i[1], h = i[2], d = i[3], y = 0; y < n.length; y += 4) p = l(n[y]), f = l(n[y + 1]), m = l(n[y + 2]), g = l(n[y + 3]), r.decrypt(p, f, m, g, o, y), o[y] = l(o[y] ^ u), o[y + 1] = l(o[y + 1] ^ c), o[y + 2] = l(o[y + 2] ^ h), o[y + 3] = l(o[y + 3] ^ d), u = p, c = f, h = m, d = g;
return a
}(e, t, i);
n.set(r, e.byteOffset)
}
}, t(i, null, [{
key: "STEP",
get: function() {
return 32e3
}
}]), i
}();
return new c(i.encrypted, i.key, i.iv, function(n) {
})
}
function decryptkey(a) {
var u = new Uint8Array(a),
l = [14, 22, 30, 38, 46, 54, 62];
for ((c = new Uint8Array(64)).set(u.slice(6)), c.set(u.slice(7), 1), mt = 0; mt < l.length; mt++) c.set(u.slice(parseInt(l[mt])), parseInt(2 * mt + 2)), c.set(u.slice(parseInt(l[mt] + 1)), parseInt(2 * mt + 3));
r = new DataView(c.buffer)
return new Uint32Array([r.getUint32(0), r.getUint32(4), r.getUint32(8), r.getUint32(12)])
}
module.exports = {decryptaes, decryptkey}