【分享】哔哩哔哩session算法

[nilaoda]

版本：https://s1.hdslb.com/bfs/static/player/main/video.9efc0c61.js

<script>
var wordsToBytes = function(e) {
                for (var t = [], n = 0; n < 32 * e.length; n += 8)
                    t.push(e[n >>> 5] >>> 24 - n % 32 & 255);
                return t
}

var bytesToWords = function(e) {
                for (var t = [], n = 0, r = 0; n < e.length; n++,
                r += 8)
                    t[r >>> 5] |= e[n] << 24 - r % 32;
                return t
}

var bytesToHex = function(e) {
                for (var t = [], n = 0; n < e.length; n++)
                    t.push((e[n] >>> 4).toString(16)),
                    t.push((15 & e[n]).toString(16));
                return t.join("")
}

var rotl = function(e, t) {
                return e << t | e >>> 32 - t
}
            
var endian = function(e) {
                if (e.constructor == Number)
                    return 16711935 & rotl(e, 8) | 4278255360 & rotl(e, 24);
                for (var t = 0; t < e.length; t++)
                    e[t] = endian(e[t]);
                return e
}

var getSession = function(e, t) {
     var n = {
            utf8: {
                stringToBytes: function(e) {
                    return n.bin.stringToBytes(unescape(encodeURIComponent(e)))
                },
                bytesToString: function(e) {
                    return decodeURIComponent(escape(n.bin.bytesToString(e)))
                }
            },
            bin: {
                stringToBytes: function(e) {
                    for (var t = [], n = 0; n < e.length; n++)
                        t.push(255 & e.charCodeAt(n));
                    return t
                },
                bytesToString: function(e) {
                    for (var t = [], n = 0; n < e.length; n++)
                        t.push(String.fromCharCode(e[n]));
                    return t.join("")
                }
            }
     };
     
     var r, i, a, o, s;
        i = n.utf8,
        a = function(e, t) {
				function n(e) {
					return !!e.constructor && "function" == typeof e.constructor.isBuffer && e.constructor.isBuffer(e)
				}
				return null != e && (n(e) || function(e) {
						return "function" == typeof e.readFloatLE && "function" == typeof e.slice && n(e.slice(0, 0))
				}(e) || !!e._isBuffer)
		},
        o = n.bin,
        (s = function e(t, n) {
            t.constructor == String ? t = n && "binary" === n.encoding ? o.stringToBytes(t) : i.stringToBytes(t) : a(t) ? t = Array.prototype.slice.call(t, 0) : Array.isArray(t) || (t = t.toString());
            for (var s = bytesToWords(t), u = 8 * t.length, l = 1732584193, d = -271733879, f = -1732584194, c = 271733878, h = 0; h < s.length; h++)
                s[h] = 16711935 & (s[h] << 8 | s[h] >>> 24) | 4278255360 & (s[h] << 24 | s[h] >>> 8);
            s[u >>> 5] |= 128 << u % 32,
            s[14 + (u + 64 >>> 9 << 4)] = u;
            var p = e._ff
              , g = e._gg
              , m = e._hh
              , y = e._ii;
            for (h = 0; h < s.length; h += 16) {
                var v = l
                  , _ = d
                  , A = f
                  , E = c;
                l = p(l, d, f, c, s[h + 0], 7, -680876936),
                c = p(c, l, d, f, s[h + 1], 12, -389564586),
                f = p(f, c, l, d, s[h + 2], 17, 606105819),
                d = p(d, f, c, l, s[h + 3], 22, -1044525330),
                l = p(l, d, f, c, s[h + 4], 7, -176418897),
                c = p(c, l, d, f, s[h + 5], 12, 1200080426),
                f = p(f, c, l, d, s[h + 6], 17, -1473231341),
                d = p(d, f, c, l, s[h + 7], 22, -45705983),
                l = p(l, d, f, c, s[h + 8], 7, 1770035416),
                c = p(c, l, d, f, s[h + 9], 12, -1958414417),
                f = p(f, c, l, d, s[h + 10], 17, -42063),
                d = p(d, f, c, l, s[h + 11], 22, -1990404162),
                l = p(l, d, f, c, s[h + 12], 7, 1804603682),
                c = p(c, l, d, f, s[h + 13], 12, -40341101),
                f = p(f, c, l, d, s[h + 14], 17, -1502002290),
                l = g(l, d = p(d, f, c, l, s[h + 15], 22, 1236535329), f, c, s[h + 1], 5, -165796510),
                c = g(c, l, d, f, s[h + 6], 9, -1069501632),
                f = g(f, c, l, d, s[h + 11], 14, 643717713),
                d = g(d, f, c, l, s[h + 0], 20, -373897302),
                l = g(l, d, f, c, s[h + 5], 5, -701558691),
                c = g(c, l, d, f, s[h + 10], 9, 38016083),
                f = g(f, c, l, d, s[h + 15], 14, -660478335),
                d = g(d, f, c, l, s[h + 4], 20, -405537848),
                l = g(l, d, f, c, s[h + 9], 5, 568446438),
                c = g(c, l, d, f, s[h + 14], 9, -1019803690),
                f = g(f, c, l, d, s[h + 3], 14, -187363961),
                d = g(d, f, c, l, s[h + 8], 20, 1163531501),
                l = g(l, d, f, c, s[h + 13], 5, -1444681467),
                c = g(c, l, d, f, s[h + 2], 9, -51403784),
                f = g(f, c, l, d, s[h + 7], 14, 1735328473),
                l = m(l, d = g(d, f, c, l, s[h + 12], 20, -1926607734), f, c, s[h + 5], 4, -378558),
                c = m(c, l, d, f, s[h + 8], 11, -2022574463),
                f = m(f, c, l, d, s[h + 11], 16, 1839030562),
                d = m(d, f, c, l, s[h + 14], 23, -35309556),
                l = m(l, d, f, c, s[h + 1], 4, -1530992060),
                c = m(c, l, d, f, s[h + 4], 11, 1272893353),
                f = m(f, c, l, d, s[h + 7], 16, -155497632),
                d = m(d, f, c, l, s[h + 10], 23, -1094730640),
                l = m(l, d, f, c, s[h + 13], 4, 681279174),
                c = m(c, l, d, f, s[h + 0], 11, -358537222),
                f = m(f, c, l, d, s[h + 3], 16, -722521979),
                d = m(d, f, c, l, s[h + 6], 23, 76029189),
                l = m(l, d, f, c, s[h + 9], 4, -640364487),
                c = m(c, l, d, f, s[h + 12], 11, -421815835),
                f = m(f, c, l, d, s[h + 15], 16, 530742520),
                l = y(l, d = m(d, f, c, l, s[h + 2], 23, -995338651), f, c, s[h + 0], 6, -198630844),
                c = y(c, l, d, f, s[h + 7], 10, 1126891415),
                f = y(f, c, l, d, s[h + 14], 15, -1416354905),
                d = y(d, f, c, l, s[h + 5], 21, -57434055),
                l = y(l, d, f, c, s[h + 12], 6, 1700485571),
                c = y(c, l, d, f, s[h + 3], 10, -1894986606),
                f = y(f, c, l, d, s[h + 10], 15, -1051523),
                d = y(d, f, c, l, s[h + 1], 21, -2054922799),
                l = y(l, d, f, c, s[h + 8], 6, 1873313359),
                c = y(c, l, d, f, s[h + 15], 10, -30611744),
                f = y(f, c, l, d, s[h + 6], 15, -1560198380),
                d = y(d, f, c, l, s[h + 13], 21, 1309151649),
                l = y(l, d, f, c, s[h + 4], 6, -145523070),
                c = y(c, l, d, f, s[h + 11], 10, -1120210379),
                f = y(f, c, l, d, s[h + 2], 15, 718787259),
                d = y(d, f, c, l, s[h + 9], 21, -343485551),
                l = l + v >>> 0,
                d = d + _ >>> 0,
                f = f + A >>> 0,
                c = c + E >>> 0
            }
            return endian([l, d, f, c])
        }
        )._ff = function(e, t, n, r, i, a, o) {
            var s = e + (t & n | ~t & r) + (i >>> 0) + o;
            return (s << a | s >>> 32 - a) + t
        }
        ,
        s._gg = function(e, t, n, r, i, a, o) {
            var s = e + (t & r | n & ~r) + (i >>> 0) + o;
            return (s << a | s >>> 32 - a) + t
        }
        ,
        s._hh = function(e, t, n, r, i, a, o) {
            var s = e + (t ^ n ^ r) + (i >>> 0) + o;
            return (s << a | s >>> 32 - a) + t
        }
        ,
        s._ii = function(e, t, n, r, i, a, o) {
            var s = e + (n ^ (t | ~r)) + (i >>> 0) + o;
            return (s << a | s >>> 32 - a) + t
        }
        ,
        s._blocksize = 16,
        s._digestsize = 16;
        
        var n = wordsToBytes(s(e, t));
        return t && t.asBytes ? n : t && t.asString ? o.bytesToString(n) : bytesToHex(n);
}
</script>
<body>
<script>
//https://s1.hdslb.com/bfs/static/player/main/video.9efc0c61.js
console.log(getSession((String((getCookie("buvid3") || Math.floor(1e5 * Math.random()).toString(16)) + Date.now()))));
</script>
</body>