慕课网视频分析

var Destm = function (e, t) {
	function r(e, t) {
		var r = "";
		if ("object" == typeof e)
			for (var n in e)
				r += String.fromCharCode(e[n]);
		e = r || e;
		for (var i, o, a = new Uint8Array(e.length), s = t.length, n = 0; n < e.length; n++)
			o = n % s, i = e[n], i = i.toString().charCodeAt(0), a[n] = i^t.charCodeAt(o);
		return a
	}
	function n(e) {
		var t = "";
		if ("object" == typeof e)
			for (var r in e)
				t += String.fromCharCode(e[r]);
		e = t || e;
		var n = new Uint8Array(e.length);
		for (r = 0; r < e.length; r++)
			n[r] = e[r].toString().charCodeAt(0);
		var i,
		o,
		r = 0;
		for (r = 0; r < n.length; r++)
			i = n[r] % 3, 0 != i && r + i < n.length && (o = n[r + 1], n[r + 1] = n[r + i], n[r + i] = o, r = r + i + 1);
		return n
	}
	function i(e) {
		var t = "";
		if ("object" == typeof e)
			for (var r in e)
				t += String.fromCharCode(e[r]);
		e = t || e;
		var n = new Uint8Array(e.length);
		for (r = 0; r < e.length; r++)
			n[r] = e[r].toString().charCodeAt(0);
		var r = 0,
		i = 0,
		o = 0,
		a = 0;
		for (r = 0; r < n.length; r++)
			o = n[r] % 2, o && r++, a++;
		var s = new Uint8Array(a);
		for (r = 0; r < n.length; r++)
			o = n[r] % 2, o ? s[i++] = n[r++] : s[i++] = n[r];
		return s
	}
	function o(e, t) {
		var r = 0,
		n = 0,
		i = 0,
		o = 0,
		a = "";
		if ("object" == typeof e)
			for (var r in e)
				a += String.fromCharCode(e[r]);
		e = a || e;
		var s = new Uint8Array(e.length);
		for (r = 0; r < e.length; r++)
			s[r] = e[r].toString().charCodeAt(0);
		for (r = 0; r < e.length; r++)
			if (o = s[r] % 5, 0 != o && 1 != o && r + o < s.length && (i = s[r + 1], n = r + 2, s[r + 1] = s[r + o], s[o + r] = i, r = r + o + 1, r - 2 > n))
				for (; n < r - 2; n++)
					s[n] = s[n]^t.charCodeAt(n % t.length);
		for (r = 0; r < e.length; r++)
			s[r] = s[r]^t.charCodeAt(r % t.length);
		return s
	}
	function a(e) {
		var t,
		r,
		n,
		i,
		o,
		a,
		s;
		for (a = e.length, o = 0, s = ""; o < a; ) {
			do
				t = f[255 & e.charCodeAt(o++)];
			while (o < a && t == -1);
			if (t == -1)
				break;
			do
				r = f[255 & e.charCodeAt(o++)];
			while (o < a && r == -1);
			if (r == -1)
				break;
			s += String.fromCharCode(t << 2 | (48 & r) >> 4);
			do {
				if (n = 255 & e.charCodeAt(o++), 61 == n)
					return s;
				n = f[n]
			} while (o < a && n == -1);
			if (n == -1)
				break;
			s += String.fromCharCode((15 & r) << 4 | (60 & n) >> 2);
			do {
				if (i = 255 & e.charCodeAt(o++), 61 == i)
					return s;
				i = f[i]
			} while (o < a && i == -1);
			if (i == -1)
				break;
			s += String.fromCharCode((3 & n) << 6 | i)
		}
		return s
	}
	for (var s = {
			data : {
				info : e
			}
		}, l = {
			q : r,
			h : n,
			m : i,
			k : o
		}, u = s.data.info, c = u.substring(u.length - 4).split(""), d = 0; d < c.length; d++)
		c[d] = c[d].toString().charCodeAt(0) % 4;
	c.reverse();
	for (var h = [], d = 0; d < c.length; d++)
		h.push(u.substring(c[d] + 1, c[d] + 2)), u = u.substring(0, c[d] + 1) + u.substring(c[d] + 2);
	s.data.encrypt_table = h,
	s.data.key_table = [];
	for (var d in s.data.encrypt_table)
		"q" != s.data.encrypt_table[d] && "k" != s.data.encrypt_table[d] || (s.data.key_table.push(u.substring(u.length - 12)), u = u.substring(0, u.length - 12));
	s.data.key_table.reverse(),
	s.data.info = u;
	var f = new Array((-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), (-1), 62, (-1), (-1), (-1), 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, (-1), (-1), (-1), (-1), (-1), (-1), (-1), 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, (-1), (-1), (-1), (-1), (-1), (-1), 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, (-1), (-1), (-1), (-1), (-1));
	s.data.info = a(s.data.info);
	for (var d in s.data.encrypt_table) {
		var p = s.data.encrypt_table[d];
		if ("q" == p || "k" == p) {
			var v = s.data.key_table.pop();
			s.data.info = l[s.data.encrypt_table[d]](s.data.info, v)
		} else
			s.data.info = l[s.data.encrypt_table[d]](s.data.info)
	}
	if (t)
		return s.data.info;
	var g = "";
	for (d = 0; d < s.data.info.length; d++)
		g += String.fromCharCode(s.data.info[d]);
	return g
};
Destm('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')

  

原文地址:https://www.cnblogs.com/xuan52rock/p/7890958.html