// This signing implementation is bundled for compatibility with the Douyin web workflow.
function rc4_encrypt(plaintext, key) {
var s = [];
for (var i = 0; i < 256; i++) {
s[i] = i;
}
var j = 0;
for (var i = 0; i < 256; i++) {
j = (j + s[i] + key.charCodeAt(i % key.length)) % 256;
var temp = s[i];
s[i] = s[j];
s[j] = temp;
}
var i = 0;
var j = 0;
var cipher = [];
for (var k = 0; k < plaintext.length; k++) {
i = (i + 1) % 256;
j = (j + s[i]) % 256;
var temp = s[i];
s[i] = s[j];
s[j] = temp;
var t = (s[i] + s[j]) % 256;
cipher.push(String.fromCharCode(s[t] ^ plaintext.charCodeAt(k)));
}
return cipher.join("");
}
function le(e, r) {
return ((e << (r %= 32)) | (e >>> (32 - r))) >>> 0;
}
function de(e) {
return 0 <= e && e < 16
? 2043430169
: 16 <= e && e < 64
? 2055708042
: void console["error"]("invalid j for constant Tj");
}
function pe(e, r, t, n) {
return 0 <= e && e < 16
? (r ^ t ^ n) >>> 0
: 16 <= e && e < 64
? ((r & t) | (r & n) | (t & n)) >>> 0
: (console["error"]("invalid j for bool function FF"), 0);
}
function he(e, r, t, n) {
return 0 <= e && e < 16
? (r ^ t ^ n) >>> 0
: 16 <= e && e < 64
? ((r & t) | (~r & n)) >>> 0
: (console["error"]("invalid j for bool function GG"), 0);
}
function reset() {
(this.reg[0] = 1937774191),
(this.reg[1] = 1226093241),
(this.reg[2] = 388252375),
(this.reg[3] = 3666478592),
(this.reg[4] = 2842636476),
(this.reg[5] = 372324522),
(this.reg[6] = 3817729613),
(this.reg[7] = 2969243214),
(this["chunk"] = []),
(this["size"] = 0);
}
function write(e) {
var a =
"string" == typeof e
? ((e) => {
(n = encodeURIComponent(e)["replace"](
/%([0-9A-F]{2})/g,
(e, r) => String["fromCharCode"]("0x" + r),
)),
(a = new Array(n["length"]));
return (
Array["prototype"]["forEach"]["call"](n, (e, r) => {
a[r] = e.charCodeAt(0);
}),
a
);
})(e)
: e;
this.size += a.length;
var f = 64 - this["chunk"]["length"];
if (a["length"] < f) this["chunk"] = this["chunk"].concat(a);
else
for (
this["chunk"] = this["chunk"].concat(a.slice(0, f));
this["chunk"].length >= 64;
)
this["_compress"](this["chunk"]),
f < a["length"]
? (this["chunk"] = a["slice"](
f,
Math["min"](f + 64, a["length"]),
))
: (this["chunk"] = []),
(f += 64);
}
function sum(e, t) {
e && (this["reset"](), this["write"](e)), this["_fill"]();
for (var f = 0; f < this.chunk["length"]; f += 64)
this._compress(this["chunk"]["slice"](f, f + 64));
var i = null;
if (t == "hex") {
i = "";
for (f = 0; f < 8; f++) i += se(this["reg"][f]["toString"](16), 8, "0");
} else
for (i = new Array(32), f = 0; f < 8; f++) {
var c = this.reg[f];
(i[4 * f + 3] = (255 & c) >>> 0),
(c >>>= 8),
(i[4 * f + 2] = (255 & c) >>> 0),
(c >>>= 8),
(i[4 * f + 1] = (255 & c) >>> 0),
(c >>>= 8),
(i[4 * f] = (255 & c) >>> 0);
}
return this["reset"](), i;
}
function _compress(t) {
if (t < 64) console.error("compress error: not enough data");
else {
for (
var f = ((e) => {
for (var r = new Array(132), t = 0; t < 16; t++)
(r[t] = e[4 * t] << 24),
(r[t] |= e[4 * t + 1] << 16),
(r[t] |= e[4 * t + 2] << 8),
(r[t] |= e[4 * t + 3]),
(r[t] >>>= 0);
for (var n = 16; n < 68; n++) {
var a = r[n - 16] ^ r[n - 9] ^ le(r[n - 3], 15);
(a = a ^ le(a, 15) ^ le(a, 23)),
(r[n] = (a ^ le(r[n - 13], 7) ^ r[n - 6]) >>> 0);
}
for (n = 0; n < 64; n++)
r[n + 68] = (r[n] ^ r[n + 4]) >>> 0;
return r;
})(t),
i = this["reg"].slice(0),
c = 0;
c < 64;
c++
) {
var o = le(i[0], 12) + i[4] + le(de(c), c),
s =
((o = le((o = (4294967295 & o) >>> 0), 7)) ^
le(i[0], 12)) >>>
0,
u = pe(c, i[0], i[1], i[2]);
u = (4294967295 & (u = u + i[3] + s + f[c + 68])) >>> 0;
var b = he(c, i[4], i[5], i[6]);
(b = (4294967295 & (b = b + i[7] + o + f[c])) >>> 0),
(i[3] = i[2]),
(i[2] = le(i[1], 9)),
(i[1] = i[0]),
(i[0] = u),
(i[7] = i[6]),
(i[6] = le(i[5], 19)),
(i[5] = i[4]),
(i[4] = (b ^ le(b, 9) ^ le(b, 17)) >>> 0);
}
for (var l = 0; l < 8; l++)
this["reg"][l] = (this["reg"][l] ^ i[l]) >>> 0;
}
}
function _fill() {
var a = 8 * this["size"],
f = this["chunk"]["push"](128) % 64;
for (64 - f < 8 && (f -= 64); f < 56; f++) this.chunk["push"](0);
for (var i = 0; i < 4; i++) {
var c = Math["floor"](a / 4294967296);
this["chunk"].push((c >>> (8 * (3 - i))) & 255);
}
for (i = 0; i < 4; i++) this["chunk"]["push"]((a >>> (8 * (3 - i))) & 255);
}
function SM3() {
this.reg = [];
this.chunk = [];
this.size = 0;
this.reset();
}
SM3.prototype.reset = reset;
SM3.prototype.write = write;
SM3.prototype.sum = sum;
SM3.prototype._compress = _compress;
SM3.prototype._fill = _fill;
function result_encrypt(long_str, num = null) {
const s_obj = {
s0: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
s1: "Dkdpgh4ZKsQB80/Mfvw36XI1R25+WUAlEi7NLboqYTOPuzmFjJnryx9HVGcaStCe=",
s2: "Dkdpgh4ZKsQB80/Mfvw36XI1R25-WUAlEi7NLboqYTOPuzmFjJnryx9HVGcaStCe=",
s3: "ckdp1h4ZKsUB80/Mfvw36XIgR25+WQAlEi7NLboqYTOPuzmFjJnryx9HVGDaStCe",
s4: "Dkdpgh2ZmsQB80/MfvV36XI1R45-WUAlEixNLwoqYTOPuzKFjJnry79HbGcaStCe",
};
const constant = {
0: 16515072,
1: 258048,
2: 4032,
str: s_obj[num],
};
let result = "";
let lound = 0;
let long_int = get_long_int(lound, long_str);
for (let i = 0; i < (long_str.length / 3) * 4; i++) {
if (Math.floor(i / 4) !== lound) {
lound += 1;
long_int = get_long_int(lound, long_str);
}
const key = i % 4;
switch (key) {
case 0:
temp_int = (long_int & constant["0"]) >> 18;
result += constant["str"].charAt(temp_int);
break;
case 1:
temp_int = (long_int & constant["1"]) >> 12;
result += constant["str"].charAt(temp_int);
break;
case 2:
temp_int = (long_int & constant["2"]) >> 6;
result += constant["str"].charAt(temp_int);
break;
case 3:
temp_int = long_int & 63;
result += constant["str"].charAt(temp_int);
break;
default:
break;
}
}
return result;
}
function get_long_int(round, long_str) {
round = round * 3;
return (
(long_str.charCodeAt(round) << 16) |
(long_str.charCodeAt(round + 1) << 8) |
long_str.charCodeAt(round + 2)
);
}
function gener_random(random, option) {
return [
(random & 255 & 170) | (option[0] & 85), // 163
(random & 255 & 85) | (option[0] & 170), //87
((random >> 8) & 255 & 170) | (option[1] & 85), //37
((random >> 8) & 255 & 85) | (option[1] & 170), //41
];
}
//////////////////////////////////////////////
function generate_rc4_bb_str(
url_search_params,
user_agent,
window_env_str,
suffix = "cus",
Arguments = [0, 1, 14],
) {
const sm3 = new SM3();
const start_time = Date.now();
/**
* 进行3次加密处理
* 1: url_search_params两次sm3之的结果
* 2: 对后缀两次sm3之的结果
* 3: 对ua处理之后的结果
*/
// url_search_params两次sm3之的结果
const url_search_params_list = sm3.sum(sm3.sum(url_search_params + suffix));
// 对后缀两次sm3之的结果
const cus = sm3.sum(sm3.sum(suffix));
// 对ua处理之后的结果
const ua = sm3.sum(
result_encrypt(
rc4_encrypt(
user_agent,
String.fromCharCode.apply(null, [0.00390625, 1, Arguments[2]]),
),
"s3",
),
);
//
const end_time = Date.now();
// b
const b = {
8: 3, // 固定
10: end_time, //3次加密结束时间
15: {
aid: 6383,
pageId: 6241,
boe: false,
ddrt: 7,
paths: {
include: [{}, {}, {}, {}, {}, {}, {}],
exclude: [],
},
track: {
mode: 0,
delay: 300,
paths: [],
},
dump: true,
rpU: "",
},
16: start_time, //3次加密开始时间
18: 44, //固定
19: [1, 0, 1, 5],
};
//3次加密开始时间
b[20] = (b[16] >> 24) & 255;
b[21] = (b[16] >> 16) & 255;
b[22] = (b[16] >> 8) & 255;
b[23] = b[16] & 255;
b[24] = (b[16] / 256 / 256 / 256 / 256) >> 0;
b[25] = (b[16] / 256 / 256 / 256 / 256 / 256) >> 0;
// 参数Arguments [0, 1, 14, ...]
// let Arguments = [0, 1, 14]
b[26] = (Arguments[0] >> 24) & 255;
b[27] = (Arguments[0] >> 16) & 255;
b[28] = (Arguments[0] >> 8) & 255;
b[29] = Arguments[0] & 255;
b[30] = (Arguments[1] / 256) & 255;
b[31] = (Arguments[1] % 256) & 255;
b[32] = (Arguments[1] >> 24) & 255;
b[33] = (Arguments[1] >> 16) & 255;
b[34] = (Arguments[2] >> 24) & 255;
b[35] = (Arguments[2] >> 16) & 255;
b[36] = (Arguments[2] >> 8) & 255;
b[37] = Arguments[2] & 255;
// (url_search_params + "cus") 两次sm3之的结果
/**let url_search_params_list = [
91, 186, 35, 86, 143, 253, 6, 76,
34, 21, 167, 148, 7, 42, 192, 219,
188, 20, 182, 85, 213, 74, 213, 147,
37, 155, 93, 139, 85, 118, 228, 213
]*/
b[38] = url_search_params_list[21];
b[39] = url_search_params_list[22];
// ("cus") 对后缀两次sm3之的结果
/**
* let cus = [
136, 101, 114, 147, 58, 77, 207, 201,
215, 162, 154, 93, 248, 13, 142, 160,
105, 73, 215, 241, 83, 58, 51, 43,
255, 38, 168, 141, 216, 194, 35, 236
]*/
b[40] = cus[21];
b[41] = cus[22];
// 对ua处理之后的结果
/**
* let ua = [
129, 190, 70, 186, 86, 196, 199, 53,
99, 38, 29, 209, 243, 17, 157, 69,
147, 104, 53, 23, 114, 126, 66, 228,
135, 30, 168, 185, 109, 156, 251, 88
]*/
b[42] = ua[23];
b[43] = ua[24];
//3次加密结束时间
b[44] = (b[10] >> 24) & 255;
b[45] = (b[10] >> 16) & 255;
b[46] = (b[10] >> 8) & 255;
b[47] = b[10] & 255;
b[48] = b[8];
b[49] = (b[10] / 256 / 256 / 256 / 256) >> 0;
b[50] = (b[10] / 256 / 256 / 256 / 256 / 256) >> 0;
// object配置项
b[51] = b[15]["pageId"];
b[52] = (b[15]["pageId"] >> 24) & 255;
b[53] = (b[15]["pageId"] >> 16) & 255;
b[54] = (b[15]["pageId"] >> 8) & 255;
b[55] = b[15]["pageId"] & 255;
b[56] = b[15]["aid"];
b[57] = b[15]["aid"] & 255;
b[58] = (b[15]["aid"] >> 8) & 255;
b[59] = (b[15]["aid"] >> 16) & 255;
b[60] = (b[15]["aid"] >> 24) & 255;
// 中间进行了环境检测
// 代码索引: 2496 索引值: 17 （索引64关键条件）
// '1536|747|1536|834|0|30|0|0|1536|834|1536|864|1525|747|24|24|Win32'.charCodeAt()得到65位数组
/**
* let window_env_list = [49, 53, 51, 54, 124, 55, 52, 55, 124, 49, 53, 51, 54, 124, 56, 51, 52, 124, 48, 124, 51,
* 48, 124, 48, 124, 48, 124, 49, 53, 51, 54, 124, 56, 51, 52, 124, 49, 53, 51, 54, 124, 56,
* 54, 52, 124, 49, 53, 50, 53, 124, 55, 52, 55, 124, 50, 52, 124, 50, 52, 124, 87, 105, 110,
* 51, 50]
*/
const window_env_list = [];
for (let index = 0; index < window_env_str.length; index++) {
window_env_list.push(window_env_str.charCodeAt(index));
}
b[64] = window_env_list.length;
b[65] = b[64] & 255;
b[66] = (b[64] >> 8) & 255;
b[69] = [].length;
b[70] = b[69] & 255;
b[71] = (b[69] >> 8) & 255;
b[72] =
b[18] ^
b[20] ^
b[26] ^
b[30] ^
b[38] ^
b[40] ^
b[42] ^
b[21] ^
b[27] ^
b[31] ^
b[35] ^
b[39] ^
b[41] ^
b[43] ^
b[22] ^
b[28] ^
b[32] ^
b[36] ^
b[23] ^
b[29] ^
b[33] ^
b[37] ^
b[44] ^
b[45] ^
b[46] ^
b[47] ^
b[48] ^
b[49] ^
b[50] ^
b[24] ^
b[25] ^
b[52] ^
b[53] ^
b[54] ^
b[55] ^
b[57] ^
b[58] ^
b[59] ^
b[60] ^
b[65] ^
b[66] ^
b[70] ^
b[71];
let bb = [
b[18],
b[20],
b[52],
b[26],
b[30],
b[34],
b[58],
b[38],
b[40],
b[53],
b[42],
b[21],
b[27],
b[54],
b[55],
b[31],
b[35],
b[57],
b[39],
b[41],
b[43],
b[22],
b[28],
b[32],
b[60],
b[36],
b[23],
b[29],
b[33],
b[37],
b[44],
b[45],
b[59],
b[46],
b[47],
b[48],
b[49],
b[50],
b[24],
b[25],
b[65],
b[66],
b[70],
b[71],
];
bb = bb.concat(window_env_list).concat(b[72]);
return rc4_encrypt(
String.fromCharCode.apply(null, bb),
String.fromCharCode.apply(null, [121]),
);
}
function generate_random_str() {
let random_str_list = [];
random_str_list = random_str_list.concat(
gener_random(Math.random() * 10000, [3, 45]),
);
random_str_list = random_str_list.concat(
gener_random(Math.random() * 10000, [1, 0]),
);
random_str_list = random_str_list.concat(
gener_random(Math.random() * 10000, [1, 5]),
);
return String.fromCharCode.apply(null, random_str_list);
}
function sign(url_search_params, user_agent, sign_args) {
/**
* url_search_params："device_platform=webapp&aid=6383&channel=channel_pc_web&update_version_code=170400&pc_client_type=1&version_code=170400&version_name=17.4.0&cookie_enabled=true&screen_width=1536&screen_height=864&browser_language=zh-CN&browser_platform=Win32&browser_name=Chrome&browser_version=123.0.0.0&browser_online=true&engine_name=Blink&engine_version=123.0.0.0&os_name=Windows&os_version=10&cpu_core_num=16&device_memory=8&platform=PC&downlink=10&effective_type=4g&round_trip_time=50&webid=<webid>&msToken=<msToken>"
* user_agent："Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36"
*/
const result_str =
generate_random_str() +
generate_rc4_bb_str(
url_search_params,
user_agent,
"1536|747|1536|834|0|30|0|0|1536|834|1536|864|1525|747|24|24|Win32",
"cus",
sign_args,
);
return result_encrypt(result_str, "s4") + "=";
}
function sign_datail(params, userAgent) {
return sign(params, userAgent, [0, 1, 14]);
}
function sign_reply(params, userAgent) {
return sign(params, userAgent, [0, 1, 8]);
}