【JS 逆向百例】某樂網登入接口參數逆向

聲明

本文章中所有内容僅供學習交流，抓包内容、敏感網址、資料接口均已做脫敏處理，嚴禁用于商業用途和非法用途，否則由此産生的一切後果均與作者無關，若有侵權，請聯系我立即删除！

逆向目标

• 目标：某樂網登入
• 首頁：aHR0cHM6Ly9vYXV0aC5kLmNuL2F1dGgvZ29Mb2dpbi5odG1s
• 接口：aHR0cHM6Ly9vYXV0aC5kLmNuL2F1dGgvbG9naW4=

• 逆向參數：

  Query String Parameters：

pwd:26fac08e6b524bef29c09479fdefe604ea7b2c4d7285a3e01f0969a9230a4e9af1b8ed23ca840978f61bf0e7850c72ece07dc95ef3f7484a5086284f825bd420da19ecd8b832877b113f21181bc9a22cc795c92f8d4c8dc6ca8b21309c674220e365ab67475a299277b0aa7842e09517c7ab3c5e693e51c4d9d9935f6ec430cb

逆向過程

抓包分析

随便輸入一個賬号密碼，點選登陸，抓包定位到登入接口為 aHR0cHM6Ly9vYXV0aC5kLmNuL2F1dGgvbG9naW4= ，GET 請求，Query String Parameters 裡，密碼 pwd 被加密處理了。

參數逆向

全局搜尋

pwd

關鍵字，在首頁就可以找到一段

submitData

送出資料的函數，埋下斷點進行調試，可以發現明文密碼是經過 RSA 加密後得到的：

跟進這個 rsa 加密函數：

var rsa = function (arg) {
      setMaxDigits(130);
      var PublicExponent = "10001";
      var modulus = "be44aec4d73408f6b60e6fe9e3dc55d0e1dc53a1e171e071b547e2e8e0b7da01c56e8c9bcf0521568eb111adccef4e40124b76e33e7ad75607c227af8f8e0b759c30ef283be8ab17a84b19a051df5f94c07e6e7be5f77866376322aac944f45f3ab532bb6efc70c1efa524d821d16cafb580c5a901f0defddea3692a4e68e6cd";
      var key = new RSAKeyPair(PublicExponent, "", modulus);
      return encryptedString(key, arg);
  };           

setMaxDigits

這個函數在 BigInt.js 裡面可以找到，而

RSAKeyPair

和

encryptedString

都可以在 RSA.js 裡面找到，由于這兩個 JS 都比較複雜，是以直接将兩個 JS 源碼全部複制下來直接調用即可。

在本地調試的過程中發現 RSA.js 裡面會提示

BarrettMu

未定義，經過調試可以發現這個函數在 Barrett.js 裡面，是以直接把 Barrett.js 也全部複制下來即可。

完整代碼

GitHub 關注 K 哥爬蟲：

https://github.com/kuaidaili

，持續分享爬蟲相關代碼！歡迎 star ！

以下隻示範部分關鍵代碼，完整代碼倉庫位址：

https://github.com/kuaidaili/crawler/

參數 JS 加密關鍵代碼

var RSAAPP = {};

RSAAPP.NoPadding = "NoPadding";
RSAAPP.PKCS1Padding = "PKCS1Padding";
RSAAPP.RawEncoding = "RawEncoding";
RSAAPP.NumericEncoding = "NumericEncoding"

function RSAKeyPair(encryptionExponent, decryptionExponent, modulus, keylen) {

    this.e = biFromHex(encryptionExponent);
    this.d = biFromHex(decryptionExponent);
    this.m = biFromHex(modulus);

    if (typeof (keylen) != 'number') {
        this.chunkSize = 2 * biHighIndex(this.m);
    } else {
        this.chunkSize = keylen / 8;
    }

    this.radix = 16;

    this.barrett = new BarrettMu(this.m);
}

function encryptedString(key, s, pad, encoding) {
    var a = new Array();
    var sl = s.length;
    var i, j, k;
    var padtype;
    var encodingtype;
    var rpad;
    var al;
    var result = "";
    var block;
    var crypt;
    var text;

    if (typeof (pad) == 'string') {
        if (pad == RSAAPP.NoPadding) {
            padtype = 1;
        } else if (pad == RSAAPP.PKCS1Padding) {
            padtype = 2;
        } else {
            padtype = 0;
        }
    } else {
        padtype = 0;
    }

    if (typeof (encoding) == 'string' && encoding == RSAAPP.RawEncoding) {
        encodingtype = 1;
    } else {
        encodingtype = 0;
    }

    if (padtype == 1) {
        if (sl > key.chunkSize) {
            sl = key.chunkSize;
        }
    } else if (padtype == 2) {
        if (sl > (key.chunkSize - 11)) {
            sl = key.chunkSize - 11;
        }
    }

    i = 0;

    if (padtype == 2) {
        j = sl - 1;
    } else {
        j = key.chunkSize - 1;
    }

    while (i < sl) {
        if (padtype) {
            a[j] = s.charCodeAt(i);
        } else {
            a[i] = s.charCodeAt(i);
        }

        i++;
        j--;
    }

    if (padtype == 1) {
        i = 0;
    }

    j = key.chunkSize - (sl % key.chunkSize);

    while (j > 0) {
        if (padtype == 2) {
            rpad = Math.floor(Math.random() * 256);

            while (!rpad) {
                rpad = Math.floor(Math.random() * 256);
            }

            a[i] = rpad;
        } else {
            a[i] = 0;
        }

        i++;
        j--;
    }

    if (padtype == 2) {
        a[sl] = 0;
        a[key.chunkSize - 2] = 2;
        a[key.chunkSize - 1] = 0;
    }

    al = a.length;

    for (i = 0; i < al; i += key.chunkSize) {

        block = new BigInt();

        j = 0;

        for (k = i; k < (i + key.chunkSize); ++j) {
            block.digits[j] = a[k++];
            block.digits[j] += a[k++] << 8;
        }

        crypt = key.barrett.powMod(block, key.e);
        if (encodingtype == 1) {
            text = biToBytes(crypt);
        } else {
            text = (key.radix == 16) ? biToHex(crypt) : biToString(crypt, key.radix);
        }
        result += text;
    }

    return result;
}

function decryptedString(key, c) {
    var blocks = c.split(" ");
    var b;
    var i, j;
    var bi;
    var result = "";

    for (i = 0; i < blocks.length; ++i) {
        if (key.radix == 16) {
            bi = biFromHex(blocks[i]);
        } else {
            bi = biFromString(blocks[i], key.radix);
        }

        b = key.barrett.powMod(bi, key.d);

        for (j = 0; j <= biHighIndex(b); ++j) {
            result += String.fromCharCode(b.digits[j] & 255, b.digits[j] >> 8);
        }
    }

    if (result.charCodeAt(result.length - 1) == 0) {
        result = result.substring(0, result.length - 1);
    }

    return (result);
}

var biRadixBase = 2;
var biRadixBits = 16;
var bitsPerDigit = biRadixBits;
var biRadix = 1 << 16; // = 2^16 = 65536
var biHalfRadix = biRadix >>> 1;
var biRadixSquared = biRadix * biRadix;
var maxDigitVal = biRadix - 1;
var maxInteger = 9999999999999998;
var maxDigits;
var ZERO_ARRAY;
var bigZero, bigOne;

function setMaxDigits(value) {
    maxDigits = value;
    ZERO_ARRAY = new Array(maxDigits);
    for (var iza = 0; iza < ZERO_ARRAY.length; iza++) ZERO_ARRAY[iza] = 0;
    bigZero = new BigInt();
    bigOne = new BigInt();
    bigOne.digits[0] = 1;
}

setMaxDigits(20);

var dpl10 = 15;
var lr10 = biFromNumber(1000000000000000);

function BigInt(flag) {
    if (typeof flag == "boolean" && flag == true) {
        this.digits = null;
    } else {
        this.digits = ZERO_ARRAY.slice(0);
    }
    this.isNeg = false;
}

function biFromDecimal(s) {
    var isNeg = s.charAt(0) == '-';
    var i = isNeg ? 1 : 0;
    var result;
    // Skip leading zeros.
    while (i < s.length && s.charAt(i) == '0') ++i;
    if (i == s.length) {
        result = new BigInt();
    } else {
        var digitCount = s.length - i;
        var fgl = digitCount % dpl10;
        if (fgl == 0) fgl = dpl10;
        result = biFromNumber(Number(s.substr(i, fgl)));
        i += fgl;
        while (i < s.length) {
            result = biAdd(biMultiply(result, lr10), biFromNumber(Number(s.substr(i, dpl10))));
            i += dpl10;
        }
        result.isNeg = isNeg;
    }
    return result;
}

function biCopy(bi) {
    var result = new BigInt(true);
    result.digits = bi.digits.slice(0);
    result.isNeg = bi.isNeg;
    return result;
}

function biFromNumber(i) {
    var result = new BigInt();
    result.isNeg = i < 0;
    i = Math.abs(i);
    var j = 0;
    while (i > 0) {
        result.digits[j++] = i & maxDigitVal;
        i >>= biRadixBits;
    }
    return result;
}

function reverseStr(s) {
    var result = "";
    for (var i = s.length - 1; i > -1; --i) {
        result += s.charAt(i);
    }
    return result;
}

var 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');

function biToString(x, radix) {
    var b = new BigInt();
    b.digits[0] = radix;
    var qr = biDivideModulo(x, b);
    var result = hexatrigesimalToChar[qr[1].digits[0]];
    while (biCompare(qr[0], bigZero) == 1) {
        qr = biDivideModulo(qr[0], b);
        digit = qr[1].digits[0];
        result += hexatrigesimalToChar[qr[1].digits[0]];
    }
    return (x.isNeg ? "-" : "") + reverseStr(result);
}

function biToDecimal(x) {
    var b = new BigInt();
    b.digits[0] = 10;
    var qr = biDivideModulo(x, b);
    var result = String(qr[1].digits[0]);
    while (biCompare(qr[0], bigZero) == 1) {
        qr = biDivideModulo(qr[0], b);
        result += String(qr[1].digits[0]);
    }
    return (x.isNeg ? "-" : "") + reverseStr(result);
}

var hexToChar = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f');

function digitToHex(n) {
    var mask = 0xf;
    var result = "";
    for (i = 0; i < 4; ++i) {
        result += hexToChar[n & mask];
        n >>>= 4;
    }
    return reverseStr(result);
}

function biToHex(x) {
    var result = "";
    var n = biHighIndex(x);
    for (var i = biHighIndex(x); i > -1; --i) {
        result += digitToHex(x.digits[i]);
    }
    return result;
}

function charToHex(c) {
    var ZERO = 48;
    var NINE = ZERO + 9;
    var littleA = 97;
    var littleZ = littleA + 25;
    var bigA = 65;
    var bigZ = 65 + 25;
    var result;

    if (c >= ZERO && c <= NINE) {
        result = c - ZERO;
    } else if (c >= bigA && c <= bigZ) {
        result = 10 + c - bigA;
    } else if (c >= littleA && c <= littleZ) {
        result = 10 + c - littleA;
    } else {
        result = 0;
    }
    return result;
}

function hexToDigit(s) {
    var result = 0;
    var sl = Math.min(s.length, 4);
    for (var i = 0; i < sl; ++i) {
        result <<= 4;
        result |= charToHex(s.charCodeAt(i))
    }
    return result;
}

function biFromHex(s) {
    var result = new BigInt();
    var sl = s.length;
    for (var i = sl,
             j = 0; i > 0; i -= 4, ++j) {
        result.digits[j] = hexToDigit(s.substr(Math.max(i - 4, 0), Math.min(i, 4)));
    }
    return result;
}

function biFromString(s, radix) {
    var isNeg = s.charAt(0) == '-';
    var istop = isNeg ? 1 : 0;
    var result = new BigInt();
    var place = new BigInt();
    place.digits[0] = 1; // radix^0
    for (var i = s.length - 1; i >= istop; i--) {
        var c = s.charCodeAt(i);
        var digit = charToHex(c);
        var biDigit = biMultiplyDigit(place, digit);
        result = biAdd(result, biDigit);
        place = biMultiplyDigit(place, radix);
    }
    result.isNeg = isNeg;
    return result;
}

function biToBytes(x)
// Returns a string containing raw bytes.
{
    var result = "";
    for (var i = biHighIndex(x); i > -1; --i) {
        result += digitToBytes(x.digits[i]);
    }
    return result;
}

function digitToBytes(n)
// Convert two-byte digit to string containing both bytes.
{
    var c1 = String.fromCharCode(n & 0xff);
    n >>>= 8;
    var c2 = String.fromCharCode(n & 0xff);
    return c2 + c1;
}

function biDump(b) {
    return (b.isNeg ? "-" : "") + b.digits.join(" ");
}

function biAdd(x, y) {
    var result;

    if (x.isNeg != y.isNeg) {
        y.isNeg = !y.isNeg;
        result = biSubtract(x, y);
        y.isNeg = !y.isNeg;
    } else {
        result = new BigInt();
        var c = 0;
        var n;
        for (var i = 0; i < x.digits.length; ++i) {
            n = x.digits[i] + y.digits[i] + c;
            result.digits[i] = n & 0xffff;
            c = Number(n >= biRadix);
        }
        result.isNeg = x.isNeg;
    }
    return result;
}

function biSubtract(x, y) {
    var result;
    if (x.isNeg != y.isNeg) {
        y.isNeg = !y.isNeg;
        result = biAdd(x, y);
        y.isNeg = !y.isNeg;
    } else {
        result = new BigInt();
        var n, c;
        c = 0;
        for (var i = 0; i < x.digits.length; ++i) {
            n = x.digits[i] - y.digits[i] + c;
            result.digits[i] = n & 0xffff;
            // Stupid non-conforming modulus operation.
            if (result.digits[i] < 0) result.digits[i] += biRadix;
            c = 0 - Number(n < 0);
        }
        // Fix up the negative sign, if any.
        if (c == -1) {
            c = 0;
            for (var i = 0; i < x.digits.length; ++i) {
                n = 0 - result.digits[i] + c;
                result.digits[i] = n & 0xffff;
                // Stupid non-conforming modulus operation.
                if (result.digits[i] < 0) result.digits[i] += biRadix;
                c = 0 - Number(n < 0);
            }
            // Result is opposite sign of arguments.
            result.isNeg = !x.isNeg;
        } else {
            // Result is same sign.
            result.isNeg = x.isNeg;
        }
    }
    return result;
}

function biHighIndex(x) {
    var result = x.digits.length - 1;
    while (result > 0 && x.digits[result] == 0) --result;
    return result;
}

function biNumBits(x) {
    var n = biHighIndex(x);
    var d = x.digits[n];
    var m = (n + 1) * bitsPerDigit;
    var result;
    for (result = m; result > m - bitsPerDigit; --result) {
        if ((d & 0x8000) != 0) break;
        d <<= 1;
    }
    return result;
}

function biMultiply(x, y) {
    var result = new BigInt();
    var c;
    var n = biHighIndex(x);
    var t = biHighIndex(y);
    var u, uv, k;

    for (var i = 0; i <= t; ++i) {
        c = 0;
        k = i;
        for (j = 0; j <= n; ++j, ++k) {
            uv = result.digits[k] + x.digits[j] * y.digits[i] + c;
            result.digits[k] = uv & maxDigitVal;
            c = uv >>> biRadixBits;
        }
        result.digits[i + n + 1] = c;
    }
    // Someone give me a logical xor, please.
    result.isNeg = x.isNeg != y.isNeg;
    return result;
}

function biMultiplyDigit(x, y) {
    var n, c, uv;

    result = new BigInt();
    n = biHighIndex(x);
    c = 0;
    for (var j = 0; j <= n; ++j) {
        uv = result.digits[j] + x.digits[j] * y + c;
        result.digits[j] = uv & maxDigitVal;
        c = uv >>> biRadixBits;
    }
    result.digits[1 + n] = c;
    return result;
}

function arrayCopy(src, srcStart, dest, destStart, n) {
    var m = Math.min(srcStart + n, src.length);
    for (var i = srcStart,
             j = destStart; i < m; ++i, ++j) {
        dest[j] = src[i];
    }
}

var highBitMasks = new Array(0x0000, 0x8000, 0xC000, 0xE000, 0xF000, 0xF800, 0xFC00, 0xFE00, 0xFF00, 0xFF80, 0xFFC0, 0xFFE0, 0xFFF0, 0xFFF8, 0xFFFC, 0xFFFE, 0xFFFF);

function biShiftLeft(x, n) {
    var digitCount = Math.floor(n / bitsPerDigit);
    var result = new BigInt();
    arrayCopy(x.digits, 0, result.digits, digitCount, result.digits.length - digitCount);
    var bits = n % bitsPerDigit;
    var rightBits = bitsPerDigit - bits;
    for (var i = result.digits.length - 1,
             i1 = i - 1; i > 0; --i, --i1) {
        result.digits[i] = ((result.digits[i] << bits) & maxDigitVal) | ((result.digits[i1] & highBitMasks[bits]) >>> (rightBits));
    }
    result.digits[0] = ((result.digits[i] << bits) & maxDigitVal);
    result.isNeg = x.isNeg;
    return result;
}

var lowBitMasks = new Array(0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F, 0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF);

function biShiftRight(x, n) {
    var digitCount = Math.floor(n / bitsPerDigit);
    var result = new BigInt();
    arrayCopy(x.digits, digitCount, result.digits, 0, x.digits.length - digitCount);
    var bits = n % bitsPerDigit;
    var leftBits = bitsPerDigit - bits;
    for (var i = 0,
             i1 = i + 1; i < result.digits.length - 1; ++i, ++i1) {
        result.digits[i] = (result.digits[i] >>> bits) | ((result.digits[i1] & lowBitMasks[bits]) << leftBits);
    }
    result.digits[result.digits.length - 1] >>>= bits;
    result.isNeg = x.isNeg;
    return result;
}

function biMultiplyByRadixPower(x, n) {
    var result = new BigInt();
    arrayCopy(x.digits, 0, result.digits, n, result.digits.length - n);
    return result;
}

function biDivideByRadixPower(x, n) {
    var result = new BigInt();
    arrayCopy(x.digits, n, result.digits, 0, result.digits.length - n);
    return result;
}

function biModuloByRadixPower(x, n) {
    var result = new BigInt();
    arrayCopy(x.digits, 0, result.digits, 0, n);
    return result;
}

function biCompare(x, y) {
    if (x.isNeg != y.isNeg) {
        return 1 - 2 * Number(x.isNeg);
    }
    for (var i = x.digits.length - 1; i >= 0; --i) {
        if (x.digits[i] != y.digits[i]) {
            if (x.isNeg) {
                return 1 - 2 * Number(x.digits[i] > y.digits[i]);
            } else {
                return 1 - 2 * Number(x.digits[i] < y.digits[i]);
            }
        }
    }
    return 0;
}

function biDivideModulo(x, y) {
    var nb = biNumBits(x);
    var tb = biNumBits(y);
    var origYIsNeg = y.isNeg;
    var q, r;
    if (nb < tb) {
        // |x| < |y|
        if (x.isNeg) {
            q = biCopy(bigOne);
            q.isNeg = !y.isNeg;
            x.isNeg = false;
            y.isNeg = false;
            r = biSubtract(y, x);
            // Restore signs, 'cause they're references.
            x.isNeg = true;
            y.isNeg = origYIsNeg;
        } else {
            q = new BigInt();
            r = biCopy(x);
        }
        return new Array(q, r);
    }

    q = new BigInt();
    r = x;

    // Normalize Y.
    var t = Math.ceil(tb / bitsPerDigit) - 1;
    var lambda = 0;
    while (y.digits[t] < biHalfRadix) {
        y = biShiftLeft(y, 1);
        ++lambda;
        ++tb;
        t = Math.ceil(tb / bitsPerDigit) - 1;
    }
    // Shift r over to keep the quotient constant. We'll shift the
    // remainder back at the end.
    r = biShiftLeft(r, lambda);
    nb += lambda; // Update the bit count for x.
    var n = Math.ceil(nb / bitsPerDigit) - 1;

    var b = biMultiplyByRadixPower(y, n - t);
    while (biCompare(r, b) != -1) {
        ++q.digits[n - t];
        r = biSubtract(r, b);
    }
    for (var i = n; i > t; --i) {
        var ri = (i >= r.digits.length) ? 0 : r.digits[i];
        var ri1 = (i - 1 >= r.digits.length) ? 0 : r.digits[i - 1];
        var ri2 = (i - 2 >= r.digits.length) ? 0 : r.digits[i - 2];
        var yt = (t >= y.digits.length) ? 0 : y.digits[t];
        var yt1 = (t - 1 >= y.digits.length) ? 0 : y.digits[t - 1];
        if (ri == yt) {
            q.digits[i - t - 1] = maxDigitVal;
        } else {
            q.digits[i - t - 1] = Math.floor((ri * biRadix + ri1) / yt);
        }

        var c1 = q.digits[i - t - 1] * ((yt * biRadix) + yt1);
        var c2 = (ri * biRadixSquared) + ((ri1 * biRadix) + ri2);
        while (c1 > c2) {
            --q.digits[i - t - 1];
            c1 = q.digits[i - t - 1] * ((yt * biRadix) | yt1);
            c2 = (ri * biRadix * biRadix) + ((ri1 * biRadix) + ri2);
        }

        b = biMultiplyByRadixPower(y, i - t - 1);
        r = biSubtract(r, biMultiplyDigit(b, q.digits[i - t - 1]));
        if (r.isNeg) {
            r = biAdd(r, b);
            --q.digits[i - t - 1];
        }
    }
    r = biShiftRight(r, lambda);
    // Fiddle with the signs and stuff to make sure that 0 <= r < y.
    q.isNeg = x.isNeg != origYIsNeg;
    if (x.isNeg) {
        if (origYIsNeg) {
            q = biAdd(q, bigOne);
        } else {
            q = biSubtract(q, bigOne);
        }
        y = biShiftRight(y, lambda);
        r = biSubtract(y, r);
    }
    // Check for the unbelievably stupid degenerate case of r == -0.
    if (r.digits[0] == 0 && biHighIndex(r) == 0) r.isNeg = false;

    return new Array(q, r);
}

function biDivide(x, y) {
    return biDivideModulo(x, y)[0];
}

function biModulo(x, y) {
    return biDivideModulo(x, y)[1];
}

function biMultiplyMod(x, y, m) {
    return biModulo(biMultiply(x, y), m);
}

function biPow(x, y) {
    var result = bigOne;
    var a = x;
    while (true) {
        if ((y & 1) != 0) result = biMultiply(result, a);
        y >>= 1;
        if (y == 0) break;
        a = biMultiply(a, a);
    }
    return result;
}

function biPowMod(x, y, m) {
    var result = bigOne;
    var a = x;
    var k = y;
    while (true) {
        if ((k.digits[0] & 1) != 0) result = biMultiplyMod(result, a, m);
        k = biShiftRight(k, 1);
        if (k.digits[0] == 0 && biHighIndex(k) == 0) break;
        a = biMultiplyMod(a, a, m);
    }
    return result;
}

function BarrettMu(m) {
    this.modulus = biCopy(m);
    this.k = biHighIndex(this.modulus) + 1;
    var b2k = new BigInt();
    b2k.digits[2 * this.k] = 1; // b2k = b^(2k)
    this.mu = biDivide(b2k, this.modulus);
    this.bkplus1 = new BigInt();
    this.bkplus1.digits[this.k + 1] = 1; // bkplus1 = b^(k+1)
    this.modulo = BarrettMu_modulo;
    this.multiplyMod = BarrettMu_multiplyMod;
    this.powMod = BarrettMu_powMod;
}

function BarrettMu_modulo(x) {
    var q1 = biDivideByRadixPower(x, this.k - 1);
    var q2 = biMultiply(q1, this.mu);
    var q3 = biDivideByRadixPower(q2, this.k + 1);
    var r1 = biModuloByRadixPower(x, this.k + 1);
    var r2term = biMultiply(q3, this.modulus);
    var r2 = biModuloByRadixPower(r2term, this.k + 1);
    var r = biSubtract(r1, r2);
    if (r.isNeg) {
        r = biAdd(r, this.bkplus1);
    }
    var rgtem = biCompare(r, this.modulus) >= 0;
    while (rgtem) {
        r = biSubtract(r, this.modulus);
        rgtem = biCompare(r, this.modulus) >= 0;
    }
    return r;
}

function BarrettMu_multiplyMod(x, y) {
    /*
    x = this.modulo(x);
    y = this.modulo(y);
    */
    var xy = biMultiply(x, y);
    return this.modulo(xy);
}

function BarrettMu_powMod(x, y) {
    var result = new BigInt();
    result.digits[0] = 1;
    var a = x;
    var k = y;
    while (true) {
        if ((k.digits[0] & 1) != 0) result = this.multiplyMod(result, a);
        k = biShiftRight(k, 1);
        if (k.digits[0] == 0 && biHighIndex(k) == 0) break;
        a = this.multiplyMod(a, a);
    }
    return result;
}

function getEncryptedPassword (arg) {
    setMaxDigits(130);
    var PublicExponent = "10001";
    var modulus = "be44aec4d73408f6b60e6fe9e3dc55d0e1dc53a1e171e071b547e2e8e0b7da01c56e8c9bcf0521568eb111adccef4e40124b76e33e7ad75607c227af8f8e0b759c30ef283be8ab17a84b19a051df5f94c07e6e7be5f77866376322aac944f45f3ab532bb6efc70c1efa524d821d16cafb580c5a901f0defddea3692a4e68e6cd";
    var key = new RSAKeyPair(PublicExponent, "", modulus);
    return encryptedString(key, arg);
}

// 測試樣例
// console.log(getEncryptedPassword("2543534534"))           

Python 關鍵代碼

#!/usr/bin/env python3
# -*- coding: utf-8 -*-


import execjs
import requests


def get_encrypted_password(password):
    with open('d_cn_encrypt.js', 'r', encoding='utf-8') as f:
        weibo_js = f.read()
    encrypted_password = execjs.compile(weibo_js).call('getEncryptedPassword', password)
    return encrypted_password


def login(encrypted_password, username):
    login_url = '脫敏處理，完整代碼關注 GitHub：https://github.com/kuaidaili/crawler/'
    headers = {
        'Host': 'oauth.d.cn',
        'Referer': 'https://oauth.d.cn/auth/goLogin.html',
        'sec-ch-ua': '" Not;A Brand";v="99", "Google Chrome";v="91", "Chromium";v="91"',
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36'
    }
    params = {
        'display': 'web',
        'name': username,
        'pwd': encrypted_password,
        'to': '脫敏處理，完整代碼關注 GitHub：https://github.com/kuaidaili/crawler/'
    }
    response = requests.get(url=login_url, params=params, headers=headers).json()
    print(response)


def main():
    username = input('請輸入登入賬号: ')
    password = input('請輸入登入密碼: ')
    encrypted_password = get_encrypted_password(password)
    login(encrypted_password, username)


if __name__ == '__main__':
    main()