网易云params和encSecKey

想定时记录一下网易云的听歌排行,发现接口有两个加密参数params和encSecKey,作以分析记录。

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数据接口是 /weapi/v1/play/record

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通过XHR定位找到 record。

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将代码拿到本地调试和补全,过程相对简单不详细描述了。


csrf-token是服务端返回的,也可以为空。
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JS代码

const jsdom = require("jsdom");
const CryptoJS = require("crypto-js");
const { JSDOM } = jsdom;
const dom = new JSDOM(`<!DOCTYPE html><p>Hello Lx</p>`);
window = global;
var document = dom.window.document;
window.document = document;

function RSAKeyPair(a, b, c) {
    this.e = biFromHex(a),
    this.d = biFromHex(b),
    this.m = biFromHex(c),
    this.chunkSize = 2 * biHighIndex(this.m),
    this.radix = 16,
    this.barrett = new BarrettMu(this.m)
}
function encryptedString(a, b) {
    for (var f, g, h, i, j, k, l, c = new Array, d = b.length, e = 0; d > e; )
        c[e] = b.charCodeAt(e),
        e++;
    for (; 0 != c.length % a.chunkSize; )
        c[e++] = 0;
    for (f = c.length,
    g = "",
    e = 0; f > e; e += a.chunkSize) {
        for (j = new BigInt,
        h = 0,
        i = e; i < e + a.chunkSize; ++h)
            j.digits[h] = c[i++],
            j.digits[h] += c[i++] << 8;
        k = a.barrett.powMod(j, a.e),
        l = 16 == a.radix ? biToHex(k) : biToString(k, a.radix),
        g += l + " "
    }
    return g.substring(0, g.length - 1)
}
function setMaxDigits(a) {
    maxDigits = a,
    ZERO_ARRAY = new Array(maxDigits);
    for (var b = 0; b < ZERO_ARRAY.length; b++)
        ZERO_ARRAY[b] = 0;
    bigZero = new BigInt,
    bigOne = new BigInt,
    bigOne.digits[0] = 1
}
function BigInt(a) {
    this.digits = "boolean" == typeof a && 1 == a ? null : ZERO_ARRAY.slice(0),
    this.isNeg = !1
}
function biCopy(a) {
    var b = new BigInt(!0);
    return b.digits = a.digits.slice(0),
    b.isNeg = a.isNeg,
    b
}
function biFromNumber(a) {
    var c, b = new BigInt;
    for (b.isNeg = 0 > a,
    a = Math.abs(a),
    c = 0; a > 0; )
        b.digits[c++] = a & maxDigitVal,
        a >>= biRadixBits;
    return b
}
function reverseStr(a) {
    var c, b = "";
    for (c = a.length - 1; c > -1; --c)
        b += a.charAt(c);
    return b
}
function biToString(a, b) {
    var d, e, c = new BigInt;
    for (c.digits[0] = b,
    d = biDivideModulo(a, c),
    e = hexatrigesimalToChar[d[1].digits[0]]; 1 == biCompare(d[0], bigZero); )
        d = biDivideModulo(d[0], c),
        digit = d[1].digits[0],
        e += hexatrigesimalToChar[d[1].digits[0]];
    return (a.isNeg ? "-" : "") + reverseStr(e)
}
function digitToHex(a) {
    var b = 15
      , c = "";
    for (i = 0; 4 > i; ++i)
        c += hexToChar[a & b],
        a >>>= 4;
    return reverseStr(c)
}
function biToHex(a) {
    var d, b = "";
    for (biHighIndex(a),
    d = biHighIndex(a); d > -1; --d)
        b += digitToHex(a.digits[d]);
    return b
}
function charToHex(a) {
    var h, b = 48, c = b + 9, d = 97, e = d + 25, f = 65, g = 90;
    return h = a >= b && c >= a ? a - b : a >= f && g >= a ? 10 + a - f : a >= d && e >= a ? 10 + a - d : 0
}
function hexToDigit(a) {
    var d, b = 0, c = Math.min(a.length, 4);
    for (d = 0; c > d; ++d)
        b <<= 4,
        b |= charToHex(a.charCodeAt(d));
    return b
}
function biFromHex(a) {
    var d, e, b = new BigInt, c = a.length;
    for (d = c,
    e = 0; d > 0; d -= 4,
    ++e)
        b.digits[e] = hexToDigit(a.substr(Math.max(d - 4, 0), Math.min(d, 4)));
    return b
}
function biAdd(a, b) {
    var c, d, e, f;
    if (a.isNeg != b.isNeg)
        b.isNeg = !b.isNeg,
        c = biSubtract(a, b),
        b.isNeg = !b.isNeg;
    else {
        for (c = new BigInt,
        d = 0,
        f = 0; f < a.digits.length; ++f)
            e = a.digits[f] + b.digits[f] + d,
            c.digits[f] = 65535 & e,
            d = Number(e >= biRadix);
        c.isNeg = a.isNeg
    }
    return c
}
function biSubtract(a, b) {
    var c, d, e, f;
    if (a.isNeg != b.isNeg)
        b.isNeg = !b.isNeg,
        c = biAdd(a, b),
        b.isNeg = !b.isNeg;
    else {
        for (c = new BigInt,
        e = 0,
        f = 0; f < a.digits.length; ++f)
            d = a.digits[f] - b.digits[f] + e,
            c.digits[f] = 65535 & d,
            c.digits[f] < 0 && (c.digits[f] += biRadix),
            e = 0 - Number(0 > d);
        if (-1 == e) {
            for (e = 0,
            f = 0; f < a.digits.length; ++f)
                d = 0 - c.digits[f] + e,
                c.digits[f] = 65535 & d,
                c.digits[f] < 0 && (c.digits[f] += biRadix),
                e = 0 - Number(0 > d);
            c.isNeg = !a.isNeg
        } else
            c.isNeg = a.isNeg
    }
    return c
}
function biHighIndex(a) {
    for (var b = a.digits.length - 1; b > 0 && 0 == a.digits[b]; )
        --b;
    return b
}
function biNumBits(a) {
    var e, b = biHighIndex(a), c = a.digits[b], d = (b + 1) * bitsPerDigit;
    for (e = d; e > d - bitsPerDigit && 0 == (32768 & c); --e)
        c <<= 1;
    return e
}
function biMultiply(a, b) {
    var d, h, i, k, c = new BigInt, e = biHighIndex(a), f = biHighIndex(b);
    for (k = 0; f >= k; ++k) {
        for (d = 0,
        i = k,
        j = 0; e >= j; ++j,
        ++i)
            h = c.digits[i] + a.digits[j] * b.digits[k] + d,
            c.digits[i] = h & maxDigitVal,
            d = h >>> biRadixBits;
        c.digits[k + e + 1] = d
    }
    return c.isNeg = a.isNeg != b.isNeg,
    c
}
function biMultiplyDigit(a, b) {
    var c, d, e, f;
    for (result = new BigInt,
    c = biHighIndex(a),
    d = 0,
    f = 0; c >= f; ++f)
        e = result.digits[f] + a.digits[f] * b + d,
        result.digits[f] = e & maxDigitVal,
        d = e >>> biRadixBits;
    return result.digits[1 + c] = d,
    result
}
function arrayCopy(a, b, c, d, e) {
    var g, h, f = Math.min(b + e, a.length);
    for (g = b,
    h = d; f > g; ++g,
    ++h)
        c[h] = a[g]
}
function biShiftLeft(a, b) {
    var e, f, g, h, c = Math.floor(b / bitsPerDigit), d = new BigInt;
    for (arrayCopy(a.digits, 0, d.digits, c, d.digits.length - c),
    e = b % bitsPerDigit,
    f = bitsPerDigit - e,
    g = d.digits.length - 1,
    h = g - 1; g > 0; --g,
    --h)
        d.digits[g] = d.digits[g] << e & maxDigitVal | (d.digits[h] & highBitMasks[e]) >>> f;
    return d.digits[0] = d.digits[g] << e & maxDigitVal,
    d.isNeg = a.isNeg,
    d
}
function biShiftRight(a, b) {
    var e, f, g, h, c = Math.floor(b / bitsPerDigit), d = new BigInt;
    for (arrayCopy(a.digits, c, d.digits, 0, a.digits.length - c),
    e = b % bitsPerDigit,
    f = bitsPerDigit - e,
    g = 0,
    h = g + 1; g < d.digits.length - 1; ++g,
    ++h)
        d.digits[g] = d.digits[g] >>> e | (d.digits[h] & lowBitMasks[e]) << f;
    return d.digits[d.digits.length - 1] >>>= e,
    d.isNeg = a.isNeg,
    d
}
function biMultiplyByRadixPower(a, b) {
    var c = new BigInt;
    return arrayCopy(a.digits, 0, c.digits, b, c.digits.length - b),
    c
}
function biDivideByRadixPower(a, b) {
    var c = new BigInt;
    return arrayCopy(a.digits, b, c.digits, 0, c.digits.length - b),
    c
}
function biModuloByRadixPower(a, b) {
    var c = new BigInt;
    return arrayCopy(a.digits, 0, c.digits, 0, b),
    c
}
function biCompare(a, b) {
    if (a.isNeg != b.isNeg)
        return 1 - 2 * Number(a.isNeg);
    for (var c = a.digits.length - 1; c >= 0; --c)
        if (a.digits[c] != b.digits[c])
            return a.isNeg ? 1 - 2 * Number(a.digits[c] > b.digits[c]) : 1 - 2 * Number(a.digits[c] < b.digits[c]);
    return 0
}
function biDivideModulo(a, b) {
    var f, g, h, i, j, k, l, m, n, o, p, q, r, s, c = biNumBits(a), d = biNumBits(b), e = b.isNeg;
    if (d > c)
        return a.isNeg ? (f = biCopy(bigOne),
        f.isNeg = !b.isNeg,
        a.isNeg = !1,
        b.isNeg = !1,
        g = biSubtract(b, a),
        a.isNeg = !0,
        b.isNeg = e) : (f = new BigInt,
        g = biCopy(a)),
        new Array(f,g);
    for (f = new BigInt,
    g = a,
    h = Math.ceil(d / bitsPerDigit) - 1,
    i = 0; b.digits[h] < biHalfRadix; )
        b = biShiftLeft(b, 1),
        ++i,
        ++d,
        h = Math.ceil(d / bitsPerDigit) - 1;
    for (g = biShiftLeft(g, i),
    c += i,
    j = Math.ceil(c / bitsPerDigit) - 1,
    k = biMultiplyByRadixPower(b, j - h); -1 != biCompare(g, k); )
        ++f.digits[j - h],
        g = biSubtract(g, k);
    for (l = j; l > h; --l) {
        for (m = l >= g.digits.length ? 0 : g.digits[l],
        n = l - 1 >= g.digits.length ? 0 : g.digits[l - 1],
        o = l - 2 >= g.digits.length ? 0 : g.digits[l - 2],
        p = h >= b.digits.length ? 0 : b.digits[h],
        q = h - 1 >= b.digits.length ? 0 : b.digits[h - 1],
        f.digits[l - h - 1] = m == p ? maxDigitVal : Math.floor((m * biRadix + n) / p),
        r = f.digits[l - h - 1] * (p * biRadix + q),
        s = m * biRadixSquared + (n * biRadix + o); r > s; )
            --f.digits[l - h - 1],
            r = f.digits[l - h - 1] * (p * biRadix | q),
            s = m * biRadix * biRadix + (n * biRadix + o);
        k = biMultiplyByRadixPower(b, l - h - 1),
        g = biSubtract(g, biMultiplyDigit(k, f.digits[l - h - 1])),
        g.isNeg && (g = biAdd(g, k),
        --f.digits[l - h - 1])
    }
    return g = biShiftRight(g, i),
    f.isNeg = a.isNeg != e,
    a.isNeg && (f = e ? biAdd(f, bigOne) : biSubtract(f, bigOne),
    b = biShiftRight(b, i),
    g = biSubtract(b, g)),
    0 == g.digits[0] && 0 == biHighIndex(g) && (g.isNeg = !1),
    new Array(f,g)
}
function biDivide(a, b) {
    return biDivideModulo(a, b)[0]
}
function BarrettMu(a) {
    this.modulus = biCopy(a),
    this.k = biHighIndex(this.modulus) + 1;
    var b = new BigInt;
    b.digits[2 * this.k] = 1,
    this.mu = biDivide(b, this.modulus),
    this.bkplus1 = new BigInt,
    this.bkplus1.digits[this.k + 1] = 1,
    this.modulo = BarrettMu_modulo,
    this.multiplyMod = BarrettMu_multiplyMod,
    this.powMod = BarrettMu_powMod
}
function BarrettMu_modulo(a) {
    var i, b = biDivideByRadixPower(a, this.k - 1), c = biMultiply(b, this.mu), d = biDivideByRadixPower(c, this.k + 1), e = biModuloByRadixPower(a, this.k + 1), f = biMultiply(d, this.modulus), g = biModuloByRadixPower(f, this.k + 1), h = biSubtract(e, g);
    for (h.isNeg && (h = biAdd(h, this.bkplus1)),
    i = biCompare(h, this.modulus) >= 0; i; )
        h = biSubtract(h, this.modulus),
        i = biCompare(h, this.modulus) >= 0;
    return h
}
function BarrettMu_multiplyMod(a, b) {
    var c = biMultiply(a, b);
    return this.modulo(c)
}
function BarrettMu_powMod(a, b) {
    var d, e, c = new BigInt;
    for (c.digits[0] = 1,
    d = a,
    e = b; ; ) {
        if (0 != (1 & e.digits[0]) && (c = this.multiplyMod(c, d)),
        e = biShiftRight(e, 1),
        0 == e.digits[0] && 0 == biHighIndex(e))
            break;
        d = this.multiplyMod(d, d)
    }
    return c
}

var maxDigits, ZERO_ARRAY, bigZero, bigOne, dpl10, lr10, hexatrigesimalToChar, hexToChar, highBitMasks, lowBitMasks, biRadixBase = 2, biRadixBits = 16, bitsPerDigit = biRadixBits, biRadix = 65536, biHalfRadix = biRadix >>> 1, biRadixSquared = biRadix * biRadix, maxDigitVal = biRadix - 1, maxInteger = 9999999999999998;
setMaxDigits(20),
dpl10 = 15,
lr10 = biFromNumber(1e15),
hexatrigesimalToChar = new Array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"),
hexToChar = new Array("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"),
highBitMasks = new Array(0,32768,49152,57344,61440,63488,64512,65024,65280,65408,65472,65504,65520,65528,65532,65534,65535),
lowBitMasks = new Array(0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535);
!function() {
    function a(a) {
        var d, e, b = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789", c = "";
        for (d = 0; a > d; d += 1)
            e = Math.random() * b.length,
            e = Math.floor(e),
            c += b.charAt(e);
        return c
    }
    function b(a, b) {
        var c = CryptoJS.enc.Utf8.parse(b)
          , d = CryptoJS.enc.Utf8.parse("0102030405060708")
          , e = CryptoJS.enc.Utf8.parse(a)
          , f = CryptoJS.AES.encrypt(e, c, {
            iv: d,
            mode: CryptoJS.mode.CBC
        });
        return f.toString()
    }
    function c(a, b, c) {
        var d, e;
        return setMaxDigits(131),
        d = new RSAKeyPair(b,"",c),
        e = encryptedString(d, a)
    }
    function d(d, e, f, g) {
        var h = {}
          , i = a(16);
        return h.encText = b(d, g),
        h.encText = b(h.encText, i),
        h.encSecKey = c(i, e, f),
        h
    }
    function e(a, b, d, e) {
        var f = {};
        return f.encText = c(a + e, b, d),
        f
    }
    window.asrsea = d,
    window.ecnonasr = e
}();

function get_params(uid,csrf_token){
    TH5M = "00e0b509f6259df8642dbc35662901477df22677ec152b5ff68ace615bb7b725152b3ab17a876aea8a5aa76d2e417629ec4ee341f56135fccf695280104e0312ecbda92557c93870114af6c9d05c4f7f0c3685b7a46bee255932575cce10b424d813cfe4875d3e82047b97ddef52741d546b8e289dc6935b3ece0462db0a22b8e7"
    i0x = {
        "uid": uid,
        "type": "-1",
        "limit": "1000",
        "offset": "0",
        "total": "true",
        "csrf_token": csrf_token
    }
    var bMr1x = window.asrsea(JSON.stringify(i0x), '010001', TH5M, '0CoJUm6Qyw8W8jud');
    console.log(bMr1x)
    return bMr1x
}

Python调用

import requests
import execjs

headers = {
    "pragma":"no-cache",
    "sec-ch-ua":"\"Chromium\";v=\"110\", \"Not A(Brand\";v=\"24\", \"Google Chrome\";v=\"110\"",
    "sec-ch-ua-mobile":"?0",
    "sec-ch-ua-platform":"\"Windows\"",
    "sec-fetch-dest":"document",
    "sec-fetch-mode":"navigate",
    "sec-fetch-site":"none",
    "sec-fetch-user":"?1",
    "upgrade-insecure-requests":"1",
    "user-agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36"
}

# Js文件命名为'wangyiyun.js'
with open('wangyiyun.js','r',encoding='utf-8') as f:
    js = f.read()
func = execjs.compile(js)
code = func.call('get_params', '92390462')
data = {
    "params":code["encText"],
    "encSecKey":code["encSecKey"]
}
print(requests.post('https://music.163.com/weapi/v1/play/record?csrf_token=',data=data,headers=headers).text)
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