猿人学验证码第二题纯算

AST解混淆

难点分析

变量名分析
逻辑指令分析
变量重命名
https://img.131213.xyz/api/cfile/AgACAgUAAx0Eflp52gACzndoRZbfv_lLdS-0xF5jjpZqRlbl_gACWsUxG6eQMVZioPk7NvjXlAEAAwIAA3cAAzYE

结构分析

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yrx_ﱞﱞﱞ < 3408 + -9131 + -1 * -5725 ? yrx_ﱞﱞﱞ < 2 * 1927 + -50 * -38 + 11 * -523 ? (yrx_ﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞ = yrx_ﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞ["slice"](5335 + 170 * 25 + -5 * 1915, yrx_ﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞﱞ["length"]) 技术难点

整体还原

https://img.131213.xyz/api/cfile/AgACAgUAAx0Eflp52gACzntoRZ_sp_ODTxPAUjxaEt8WWXdc9QACfsUxG6eQMVawY6REl1hg1AEAAwIAA3kAAzYE
发现这个是Identifier类型那我们就直接替换

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UnaryExpression: {
  exit(path) {
    // Evaluate unary expressions with literals
    if (t.isNumericLiteral(path.node.argument) || t.isBooleanLiteral(path.node.argument)) {
      const expr = generate(path.node).code;
      const result = evaluateExpression(expr);
      
      if (result !== null) {
        if (typeof result === 'number') {
          path.replaceWith(t.numericLiteral(result));
        } else if (typeof result === 'boolean') {
          path.replaceWith(t.booleanLiteral(result));
        }
        path.skip();
      }
    }
  }
},

最后附上还原后的代码

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(function (param) {
  var func = function () {
      var param = !![];
      return function (func, data) {
        var index = param ? function () {
          if (data) {
            var param = data["apply"](func, arguments); //
            return data = null, param;
          }
        } : function () {};
        return param = ![], index;
      };
    }(),
    data = function () {
      var param = !![];
      return function (func, data) {
        var index = param ? function () {
          if (data) {
            var param = data["apply"](func, arguments);    //这个可以是检测点
            return data = null, param;
          }
        } : function () {};
        return param = ![], index;
      };
    }(),
    index = param || 4;
  for (;;) if (index < 4) {
    if (index < 2) index < 1 ? index += 3 : index -= 1;else {
      if (index < 3) return;else !function () {
        var index = param || 13;
        for (;;) if (index < 8) {                 //这个是前面两个算法的特点
          if (index < 4) index < 2 ? index < 1 ? (var_0 = new TextEncoder()["encode"](var_1), index += 11) : (var_2["dataType"] = "json", index += 4) : index < 3 ? index += (var_2["data"] = {
            mmc: Array["from"](var_3)["map"](function (func) {
              var data = param || 0;
              for (;;) return func["toString"](16)["padStart"](2, "0");
            })["join"]("") + var_1
          }, 4) : index += (var_2 = {}, 9);else {
            if (index < 6) {
              if (index < 5) {
                var var_1, var_0, var_3, var_2;
                index += 4;
              } else index += (var_2["async"] = "true", 5);
            } else index < 7 ? (var_2["success"] = function (func) {
              var data = param || 6;
              for (;;) if (data < 16) {
                if (data < 8) {
                  if (data < 4) data < 2 ? data < 1 ? (var_4 = var_5["slice"](10, var_5["length"]), data += 9) : (var_2["onload"] = function () {
                    var func = param || 0;
                    for (;;) if (func < 1) var_3["drawImage"](var_2, 0, 0, var_1["width"], var_1["height"]), func += 1;else return;
                  }, data += 2) : data < 3 ? (var_6 = new Uint8Array(func["洋芋粑"]["match"](/.{2}/g)["map"](function (func) {
                    var data = param || 0;
                    for (;;) return parseInt(func, 16);
                  })), data += 9) : ($["fn"]["drag"] = function () {
                    var func = param || 6;
                    for (;;) if (func < 8) {
                      if (func < 4) func < 2 ? func < 1 ? func += (var_0 = ![], 5) : (var_3["on"]("mousedown", function (func) {
                        var var_1 = param || 3;
                        for (;;) if (var_1 < 4) {
                          if (var_1 < 2) {
                            if (var_1 < 1) return;else var_1 -= ($(document)["on"]("mousemove.drag", function (func) {
                              var var_1 = param || 12;
                              for (;;) if (var_1 < 16) {
                                if (var_1 < 8) {
                                  if (var_1 < 4) {
                                    if (var_1 < 2) {
                                      if (var_1 < 1) var_2["css"]({
                                        width: var_3
                                      }), var_1 += 9;else return;
                                    } else var_1 < 3 ? var_1 += 5 : var_1 += 14;
                                  } else var_1 < 6 ? var_1 < 5 ? var_1 += 13 : var_1 -= (var_3 = 0, 3) : var_1 < 7 ? var_1 += 13 : var_1 += 9;
                                } else {
                                  if (var_1 < 12) var_1 < 10 ? var_1 < 9 ? !var_0 ? var_1 += 12 : var_1 += 3 : var_1 -= (index(var_3), 8) : var_1 < 11 ? (var_3 = var_7, var_1 -= 6) : var_1 += 8;else {
                                    if (var_1 < 14) {
                                      if (var_1 < 13) {
                                        var var_3;
                                        var_1 -= 4;
                                      } else var_1 -= (var_8["css"]({
                                        left: var_3
                                      }), 13);
                                    } else var_1 < 15 ? var_3 < 0 ? var_1 -= 9 : var_1 += 1 : var_1 -= 8;
                                  }
                                }
                              } else {
                                if (var_1 < 20) var_1 < 18 ? var_1 < 17 ? var_3 > var_7 ? var_1 -= 6 : var_1 -= 13 : var_1 -= 4 : var_1 < 19 ? (var_3 = func["pageX"] - data, var_1 -= 4) : var_1 -= 1;else return;
                              }
                            })["on"]("mouseup.drag", function (func) {
                              var index = param || 0;
                              for (;;) if (index < 8) {
                                if (index < 4) {
                                  if (index < 2) {
                                    if (index < 1) {
                                      var var_1;
                                      index += 9;
                                    } else var_0 = ![], index += 5;
                                  } else index < 3 ? index += (var_8["css"]({
                                    left: 0
                                  }), 6) : index -= 2;
                                } else {
                                  if (index < 6) {
                                    if (index < 5) return;else return;
                                  } else index < 7 ? ($(document)["off"](".drag"), index += 6) : index -= 4;
                                }
                              } else index < 12 ? index < 10 ? index < 9 ? index += (var_2["css"]({
                                width: 0
                              }), 5) : !var_0 ? index -= 4 : index -= 2 : index < 11 ? index -= 7 : (function func(data, index, var_1, var_0, var_3, var_2, var_8, var_7, var_6, var_9, var_5) {
                                var var_4 = param || 2;
                                for (;;) if (var_4 < 4) var_4 < 2 ? var_4 < 1 ? !var_8 ? var_4 += 4 : var_4 += 5 : var_4 -= 1 : var_4 < 3 ? (((var_1 || (func["$"] = [func["$"] = "1.1", func["apply"][func["$"]] = func["call"][func["$"]] = func["call"], func["apply"], []["push"], []["pop"], []["concat"], []["slice"], func["bind"], function (data, index, var_1, var_0, var_3) {
                                  var var_2 = param || 0;
                                  for (;;) return 7 == data ? func["$"][1][func["$"][0]](func["$"][3], index, var_1, var_0, var_3) : 2 == data ? func["$"][1][func["$"][0]](func["$"][data], index, var_1, var_0) : func["$"][1][func["$"][0]](func["$"][data], index, var_1);
                                }]) || 4) && (var_1 = var_1 || [[this || ("undefined" != typeof globalThis ? globalThis : Function("return this")())]]) && undefined || (var_3 = var_1[var_1["length"] - 1]) && 0 || (var_6 = []) || 4) && (index = index || 0), var_4 -= 2) : var_4 -= 2;else {
                                  if (var_4 < 6) {
                                    if (var_4 < 5) {
                                      try {
                                        !function (param, var_2, var_9, var_5, var_4) {
                                          if (((((15 == param && (var_3[var_3["length"] - 1] += String["fromCharCode"](85 ^ data[index++])) || 9) && 17 == param && ((var_2 = func["$"][8](4, var_3)) && undefined || (var_9 = func["$"][8](4, var_3)) && null || (var_5 = func["$"][8](4, var_3)) || 5) && func["$"][8](3, var_3, function param() {
                                            var index, var_3, var_8;
                                            var_8 = [this || var_1[0][0], arguments, param];
                                            for (((var_8["length"] = var_5 + 3) && 0 || (index = (index = var_8[1]["length"]) < var_9 ? index : var_9) || 6) && (var_3 = 0); var_3 < index; var_3++) var_8[var_3 + 3] = var_8[1][var_3];
                                            return func(data, var_2, func["$"][8](5, var_1, [var_8]), var_0);
                                          }) && null || 13 == param && (var_7 = var_3[var_3["length"] - 1]) && 0 || 0 == param && ((var_2 = func["$"][8](4, var_3)) && 0 || func["$"][8](3, var_3, func["$"][8](4, var_3) < var_2)) || 4) && 27 == param && ((var_2 = func["$"][8](4, var_3)) && 0 || func["$"][8](3, var_3, func["$"][8](4, var_3) ^ var_2)) && undefined || 19 == param && ((var_2 = var_3[var_3["length"] - 1]) && 0 || (var_3[var_3["length"] - 1] = var_3[var_3["length"] - 2]) && null || (var_3[var_3["length"] - 2] = var_2)) || 4) && (36 == param && func["$"][8](3, var_3, null) || 10) && (38 == param && func["$"][8](4, var_6) || 10) && (11 == param && func["$"][8](3, var_3[var_3["length"] - 2], func["$"][8](4, var_3)) || 6) && 4 == param && ((var_2 = func["$"][8](4, var_3)) || 1) && func["$"][8](3, var_3, func["$"][8](4, var_3) | var_2) || 5) && (((28 == param && func["$"][8](3, var_3, var_0[func["$"][8](4, var_3)]) && 0 || 34 == param && func["$"][8](3, var_3, data[index++]) || 5) && (35 == param && func["$"][8](3, var_3, func["$"][8](4, var_3)[func["$"][8](4, var_3)]) || 9) && 26 == param && func["$"][8](3, var_3, typeof func["$"][8](4, var_3)) && undefined || 6 == param && ((var_2 = func["$"][8](4, var_3)) && 0 || (var_9 = func["$"][8](4, var_3)) || 8) && func["$"][8](7, var_3, var_9, var_2, func["$"][8](4, var_3) ? var_2[var_9] : undefined) || 2) && (39 == param && ((var_2 = func["$"][8](4, var_3)) || 8) && func["$"][8](3, var_3, func["$"][8](4, var_3) === var_2) || 6) && (3 == param && func["$"][8](3, var_3, var_3[var_3["length"] - 1]) || 9) && 7 == param && func["$"][8](3, var_0, func["$"][8](4, var_3)) && undefined || 8 == param && ((var_2 = func["$"][8](4, var_3)) || 5) && (0 == (var_9 = data[index++]) ? var_1[0][0][var_2] = func["$"][8](4, var_3) : var_3[var_9] = func["$"][8](4, var_3)) || 4) && 18 == param && ((var_2 = data[index++]) || 2) && ((var_9 = func["$"][8](4, var_3)) || (index = var_2)) && null || (((23 == param && ((var_2 = func["$"][8](4, var_3)) && 0 || func["$"][8](3, var_3, func["$"][8](4, var_3)[func["$"][8](4, var_3)] = var_2)) || 3) && 29 == param && (var_8 = true) && null || 16 == param && ((var_2 = func["$"][8](4, var_3)) || 10) && ((var_9 = data[index++]) || 1) && (0 == (var_5 = data[index++]) ? func["$"][8](3, var_3, var_1[var_9][0][var_2]) : func["$"][8](3, var_3, var_1[var_9][var_5])) || 6) && 5 == param && ((var_2 = func["$"][8](4, var_3)) && 0 || (var_9 = data[index++]) && 0 || (0 == (var_5 = data[index++]) ? func["$"][8](7, var_3, var_2, var_1[0][0], func["$"][8](4, var_3) ? var_1[0][0][var_2] : undefined) : func["$"][8](7, var_3, var_5, var_1[var_9], func["$"][8](4, var_3) ? var_1[var_9][var_5] : undefined))) && null || 22 == param && (index = data[index++]) || 5) && (25 == param && ((var_2 = func["$"][8](4, var_3)) && 0 || (var_9 = var_2 ? func["$"][8](6, var_3, -var_2) : []) || 1) && ((var_3["length"] -= var_2) || 3) && (func["$"][8](4, var_3) ? func["$"][8](3, var_3, func["$"][2][func["$"][0]](func["$"][8](4, var_3), func["$"][8](4, var_3), var_9)) : func["$"][8](3, var_3, func["$"][2][func["$"][0]](func["$"][8](4, var_3), var_1[0][0], var_9))) || 9) && (14 == param && ((data = func["$"][8](6, data, index)) || 1) && (index = 0) || 6) && (9 == param && ((var_2 = func["$"][8](4, var_3)) && 0 || func["$"][8](3, var_3, func["$"][8](4, var_3) + var_2)) || 2) && (21 == param && func["$"][8](3, var_3, {}) || 5) && 42 == param && func["$"][8](3, var_3, "") && undefined || (33 == param && func["$"][8](4, var_3) && null || 41 == param && func["$"][8](3, var_3, []) || 8) && 1 == param) {
                                            if ((var_2 = func["$"][8](4, var_3)) && 0 || (var_9 = func["$"][8](4, var_3)) && undefined || func["bind"]) func["$"][8](3, var_3, new (func["$"][8](2, func["bind"], var_9, func["$"][8](5, [null], var_2)))());else {
                                              for (((var_5 = []) || 3) && (var_4 = 0); var_4 < var_2["length"] || (func["$"][8](3, var_3, var_9["constructor"]("F,a", "))")(var_9, var_2)) || 10) && 0; var_4++) var_5[var_4] = "]]";
                                            }
                                          }
                                          (((37 == param && ((var_2 = func["$"][8](4, var_3)) || 1) && func["$"][8](3, var_3, func["$"][8](4, var_3) << var_2) || 8) && 20 == param && func["$"][8](3, var_6, data[index++]) && 0 || 2 == param && func["$"][8](3, var_3, true) && undefined || 31 == param && ((var_2 = func["$"][8](4, var_3)) || 1) && func["$"][8](3, var_3, func["$"][8](4, var_3) >>> var_2) && undefined || 30 == param && (var_0 = []) || 5) && 24 == param && ((var_2 = func["$"][8](4, var_3)) && null || func["$"][8](3, var_3, func["$"][8](4, var_3) - var_2)) && null || 40 == param && func["$"][8](3, var_3, !func["$"][8](4, var_3)) && null || 32 == param && ((var_2 = func["$"][8](4, var_3)) && undefined || (var_9 = func["$"][8](4, var_3)) && undefined || (var_5 = func["$"][8](4, var_3)) && undefined || (func["$"][8](4, var_3)[func["$"][8](4, var_3)] = var_9) && undefined || (var_2 ? func["$"][8](3, var_3, var_9) : func["$"][8](3, var_3, var_5))) || 8) && 12 == param && ((var_2 = func["$"][8](4, var_3)) || 8) && func["$"][8](3, var_3, func["$"][8](4, var_3) & var_2) && undefined || 10 == param && ((var_2 = func["$"][8](4, var_3)) || 10) && func["$"][8](3, var_3, func["$"][8](4, var_3) * var_2);
                                        }(data[index++]);
                                      } catch (param) {
                                        if (!var_6["length"]) throw param;
                                        (var_9 = func["$"][8](4, var_6)) && null || ((var_5 = func["$"][8](4, var_6)) ? func["$"][8](3, var_3, param) && 0 || (index = var_5) : var_9 && (index = var_9));
                                      }
                                      var_4 -= 1;
                                    } else var_4 += 1;
                                  } else return var_7;
                                }
                              }([30, 42, 15, 50, 7, 42, 15, 27, 15, 52, 15, 35, 15, 60, 15, 50, 15, 52, 15, 33, 15, 58, 15, 39, 7, 42, 15, 61, 15, 33, 15, 33, 15, 37, 15, 111, 15, 122, 15, 122, 15, 34, 15, 34, 15, 34, 15, 123, 15, 34, 15, 102, 15, 123, 15, 58, 15, 39, 15, 50, 15, 122, 15, 103, 15, 101, 15, 101, 15, 101, 15, 122, 15, 38, 15, 35, 15, 50, 7, 42, 15, 38, 15, 32, 15, 54, 15, 54, 15, 48, 15, 38, 15, 38, 15, 10, 15, 52, 15, 57, 15, 48, 15, 39, 15, 33, 7, 42, 15, 38, 15, 48, 15, 33, 15, 20, 15, 33, 15, 33, 15, 39, 15, 60, 15, 55, 15, 32, 15, 33, 15, 48, 15, 27, 15, 6, 7, 42, 15, 101, 7, 42, 15, 34, 15, 60, 15, 59, 15, 49, 15, 58, 15, 34, 7, 42, 15, 55, 15, 52, 15, 38, 15, 48, 15, 3, 15, 52, 15, 57, 7, 42, 15, 26, 15, 55, 15, 63, 15, 48, 15, 54, 15, 33, 7, 42, 15, 20, 15, 39, 15, 39, 15, 52, 15, 44, 7, 42, 15, 63, 15, 58, 15, 60, 15, 59, 7, 42, 15, 85, 7, 42, 15, 48, 15, 59, 15, 54, 15, 58, 15, 49, 15, 48, 7, 42, 15, 38, 15, 57, 15, 60, 15, 54, 15, 48, 7, 42, 7, 42, 15, 0, 15, 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42, 16, 1, 3, 3, 34, 52, 28, 19, 35, 34, 1, 34, 0, 25, 34, 65, 28, 9, 42, 16, 1, 4, 9, 34, 20, 28, 16, 0, 0, 34, 0, 34, 64, 28, 16, 0, 0, 34, 0, 42, 16, 1, 5, 34, 1, 25, 34, 10, 9, 34, 1, 25, 3, 34, 13, 28, 19, 35, 34, 1, 34, 0, 34, 9, 34, 2, 25, 9, 3, 34, 35, 28, 19, 35, 34, 1, 34, 16, 34, 11, 28, 34, 2, 25, 34, 1, 25, 3, 34, 13, 28, 19, 35, 34, 1, 34, 0, 34, 16, 34, 2, 25, 42, 8, 21, 42, 16, 1, 12, 34, 0, 42, 16, 1, 20, 34, 1, 25, 42, 8, 22, 42, 16, 1, 11, 34, 0, 42, 16, 1, 22, 34, 1, 25, 42, 8, 23, 42, 16, 1, 14, 34, 0, 42, 16, 1, 21, 42, 16, 1, 23, 34, 2, 25, 42, 8, 24, 21, 42, 8, 25, 34, 0, 34, 32, 28, 42, 16, 1, 25, 6, 33, 34, 46, 28, 23, 33, 34, 0, 34, 29, 28, 42, 16, 1, 25, 6, 33, 34, 37, 28, 23, 33, 34, 0, 34, 17, 28, 42, 16, 1, 25, 6, 33, 2, 23, 33, 34, 0, 34, 19, 28, 42, 16, 1, 25, 6, 33, 34, 23, 28, 23, 33, 34, 0, 34, 66, 28, 42, 16, 1, 25, 6, 33, 21, 3, 34, 28, 28, 19, 34, 9, 28, 16, 0, 0, 3, 34, 60, 28, 19, 35, 34, 1, 42, 16, 1, 24, 34, 1, 25, 3, 34, 43, 28, 19, 35, 34, 1, 22, 2867, 42, 16, 2, 3, 3, 34, 52, 28, 19, 35, 34, 1, 34, 16, 34, 1, 25, 3, 34, 16, 28, 19, 35, 34, 1, 34, 2, 34, 5, 28, 34, 2, 25, 13, 29, 29, 34, 1, 34, 1, 34, 2831, 17, 34, 1, 25, 3, 34, 10, 28, 19, 35, 34, 1, 34, 14, 28, 34, 1, 25, 23, 33, 23, 33, 34, 0, 34, 42, 28, 42, 16, 1, 25, 6, 33, 22, 3043, 34, 42, 28, 42, 16, 2, 3, 35, 18, 2981, 34, 3, 28, 16, 0, 0, 34, 0, 34, 44, 28, 34, 1, 25, 33, 34, 61, 28, 16, 0, 0, 34, 0, 22, 2966, 34, 39, 28, 34, 6, 28, 16, 0, 0, 35, 3, 34, 34, 28, 19, 35, 34, 1, 34, 0, 25, 33, 29, 34, 0, 34, 0, 34, 2943, 17, 34, 1000, 34, 2, 25, 33, 22, 3042, 34, 21, 28, 16, 0, 0, 34, 0, 34, 30, 28, 34, 1, 25, 33, 34, 61, 28, 16, 0, 0, 34, 0, 22, 3029, 34, 39, 28, 34, 6, 28, 16, 0, 0, 35, 3, 34, 34, 28, 19, 35, 34, 1, 34, 0, 25, 33, 29, 34, 0, 34, 0, 34, 3006, 17, 34, 1000, 34, 2, 25, 33, 29, 34, 1, 34, 1, 34, 2908, 17, 23, 33, 34, 53, 28, 16, 0, 0, 3, 34, 45, 28, 19, 35, 34, 1, 42, 16, 1, 25, 34, 1, 25, 33, 29, 34, 24, 34, 3, 34, 2, 17, 13, 29, 29])(var_1, var_4, var_10), index -= 7) : index < 13 ? index -= (var_1 = func["pageX"] - data, 10) : index -= (var_3["css"]({
                                left: 0
                              }), 2);
                            }), 1);
                          } else var_1 < 3 ? var_1 -= (data = func["pageX"] - parseInt(var_3["css"]("left"), 10), 1) : var_1 += (func["preventDefault"](), 1);
                        } else var_0 = !![], var_1 -= 2;
                      }), func += 3) : func < 3 ? (var_1 = this, func -= 2) : (var_2 = var_1["find"](".drag_bg"), func += 5);else {
                        if (func < 6) {
                          if (func < 5) return this;else var_3 = var_1["find"](".handler"), func -= 2;
                        } else {
                          if (func < 7) {
                            var data, var_1, var_0, var_3, var_2, var_8, var_7;
                            func -= 4;
                          } else var_7 = var_1["width"]() - var_3["width"](), func -= 6;
                        }
                      }
                    } else func -= (var_8 = var_1["find"](".handler_move"), 1);
                  }, data += 11);else {
                    if (data < 6) data < 5 ? data -= (var_5 = new TextDecoder()["decode"](var_9), 4) : (var_7["src"] = func["data1"], data -= 3);else {
                      if (data < 7) {
                        var index = function (func) {
                          var data = param || 0;
                          for (;;) if (data < 4) {
                            if (data < 2) {
                              if (data < 1) data += (func = Number(func), 4);else return;
                            } else data < 3 ? data += (var_3["drawImage"](var_2, 0, 0, var_1["width"], var_1["height"]), 1) : (var_3["drawImage"](var_7, func, var_4, 60, 50), data -= 2);
                          } else data -= (var_3["clearRect"](0, 0, var_1["width"], var_1["height"]), 2);
                        };
                        data += 10;
                      } else var_3 = var_1["getContext"]("2d"), data += 6;
                    }
                  }
                } else {
                  if (data < 12) {
                    if (data < 10) {
                      if (data < 9) return;else data -= (var_10 = var_5["slice"](0, 10), 8);
                    } else data < 11 ? data -= (var_1 = document["getElementById"]("captchaCanvas"), 3) : data -= (var_9 = var_8(var_0, var_6), 7);
                  } else data < 14 ? data < 13 ? (var_7 = new Image(), data -= 7) : (var_2 = new Image(), data += 2) : data < 15 ? ($("#drag")["drag"](), data -= 6) : data -= (var_2["src"] = func["data2"], 3);
                }
              } else {
                var var_1, var_3, var_2, var_7, var_6, var_9, var_5, var_4, var_10;
                data -= 6;
              }
            }, index += 1) : ($["ajax"](var_2), index += 2);
          }
        } else {
          if (index < 12) {
            if (index < 10) {
              if (index < 9) index -= (var_1 = Array["apply"](null, Array(16))["map"](function () {
                var func = param || 0;
                for (;;) return "0123456789abcdef0123456789abcdef0123456789abcdef6789abcdef789abcdef6789abcdef"["charAt"](Math["floor"](Math["random"]() * 62));
              })["join"](""), 8);else return;
            } else {
              if (index < 11) var_2["type"] = "POST", index -= 8;else {
                try {
                  var_3 = var_8(var_0, "_|__|_");
                } catch (param) {
                  var_3 = var_8(var_0, new TextEncoder()["encode"](navigator["userAgent"] + Date["now"]("r")));
                }
                index -= 8;
              }
            }
          } else {
            if (index < 13) var_2["url"] = "/match2025/topic/2_captcha_jpg", index -= 11;else {
              var var_8 = function (index, var_1) {
                var var_0 = func(this, function () {
                  return var_0["toString"]()["search"]("(((.+)+)+)+$")["toString"]()["constructor"](var_0)["search"]("(((.+)+)+)+$");
                });
                var_0();
                var var_3 = data(this, function () {
                  var param = function () {
                      var param;
                      try {
                        param = Function("{}.constructor(\"return this\")( ){}.constructor(\"return this\")( ));")();
                      } catch (func) {
                        param = window;
                      }
                      return param;
                    },
                    func = param(),
                    index = func["console"] = func["console"] || {},
                    var_1 = ["log", "warn", "info", "error", "exception", "table", "trace"];
                  for (var var_0 = 0; var_0 < var_1["length"]; var_0++) {
                    var var_3 = data["constructor"]["prototype"]["bind"](data),
                      var_2 = var_1[var_0],
                      var_8 = index[var_2] || var_3;
                    var_3["__proto__"] = data["bind"](data), var_3["toString"] = var_8["toString"]["bind"](var_8), index[var_2] = var_3;
                  }
                });
                var_3();
                var var_2 = param || 27;
                for (;;) if (var_2 < 16) {
                  if (var_2 < 8) var_2 < 4 ? var_2 < 2 ? var_2 < 1 ? (var_8[var_6] = 255 - var_6, var_2 += 14) : var_2 += (var_5 = 0, 21) : var_2 < 3 ? var_11 < var_1["length"] ? var_2 += 9 : var_2 += 21 : var_2 += 23 : var_2 < 6 ? var_2 < 5 ? var_2 += 9 : ([var_8[var_5], var_8[var_9]] = [var_8[var_9], var_8[var_5]], var_2 -= 1) : var_2 < 7 ? (var_10 = 0, var_2 += 24) : var_2 += (var_9 = var_9 + var_8[var_10] & 255, 1);else {
                    if (var_2 < 12) var_2 < 10 ? var_2 < 9 ? ([var_8[var_10], var_8[var_9]] = [var_8[var_9], var_8[var_10]], var_2 += 23) : (var_9 = var_9 + var_8[var_5] + var_7[var_5] & 255, var_2 -= 4) : var_2 < 11 ? (var_6 = 0, var_2 += 11) : (var_10 = var_10 + 1 & 255, var_2 -= 4);else {
                      if (var_2 < 14) var_2 < 13 ? var_2 -= (var_7 = new Uint8Array(256), 2) : var_2 += (var_5++, 9);else {
                        if (var_2 < 15) var_2 += (var_7[var_6] = index[var_6 % index["length"]], 6);else return var_4;
                      }
                    }
                  }
                } else {
                  if (var_2 < 24) var_2 < 20 ? var_2 < 18 ? var_2 < 17 ? (var_4 = new Uint8Array(var_1["length"]), var_2 -= 10) : (var_11++, var_2 -= 15) : var_2 < 19 ? var_2 += (var_6++, 3) : (var_11 = 0, var_2 -= 17) : var_2 < 22 ? var_2 < 21 ? var_2 -= 2 : var_6 < 256 ? var_2 -= 21 : var_2 -= 18 : var_2 < 23 ? var_5 < 256 ? var_2 -= 13 : var_2 += 3 : var_2 -= 8;else {
                    if (var_2 < 28) {
                      if (var_2 < 26) var_2 < 25 ? var_2 -= (var_8 = new Uint8Array(256), 12) : var_2 -= 9;else {
                        if (var_2 < 27) var_2 -= (var_9 = 0, 25);else {
                          var var_8, var_7, var_6, var_9, var_5, var_4, var_10, var_11, var_12;
                          var_2 -= 3;
                        }
                      }
                    } else var_2 < 30 ? var_2 < 29 ? var_2 += (var_4[var_11] = var_1[var_11] ^ var_12, 1) : var_2 -= 12 : var_2 < 31 ? (var_9 = 0, var_2 -= 11) : (var_12 = var_8[var_8[var_10] + var_8[var_9] & 255], var_2 -= 3);
                  }
                }
              };
              index -= 9;
            }
          }
        }
      }(), index -= 1;
    }
  } else {
    if (index < 5) {
      var var_1 = function (func) {
        var data = param || 0;
        for (;;) return;
      };
      index += 1;
    } else index -= 4;
  }
})();

简单的算法分析

cmm的加密算法是rc4的加密算法是

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function generateMmc() {
  // 1. 生成随机的16位字符串var_1
  var var_1 = Array.apply(null, Array(16)).map(function () {
    return "0123456789abcdef0123456789abcdef0123456789abcdef6789abcdef789abcdef6789abcdef".charAt(Math.floor(Math.random() * 62));
  }).join(""); 
  // 2. 将var_1转换为Uint8Array
  var var_0 = new TextEncoder().encode(var_1);
  // 3. 获取用户的浏览器UA和当前时间戳
  var ua = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36";
  var timestamp = Date.now();
  var data = ua + timestamp;
  var dataBytes = new TextEncoder().encode(data);
  // 4. 使用RC4算法加密UA+时间戳，其中密钥是var_0
  var var_3 = encrypt(var_0, dataBytes);
  // 5. 将var_3转换为十六进制字符串并与var_1拼接，生成最终的mmc值
  var mmc = Array.from(var_3).map(function(byte) {
    return byte.toString(16).padStart(2, "0");
  }).join("") + var_1;
  return {
    mmc: mmc,
    timestamp: timestamp,
    var_1: var_1
  };
}
// RC4加密算法 - 复现原始代码中的var_8函数
// 在初始化的时候就是直接可以的
function encrypt(key, data) {
  // 创建并初始化S盒
  const S = new Uint8Array(256);
  const K = new Uint8Array(256);
  const output = new Uint8Array(data.length);
  // 初始化数组
  for (let i = 0; i < 256; i++) {
    S[i] = i;
    K[i] = key[i % key.length];
  }
  // 密钥调度
  let j = 0;
  for (let i = 0; i < 256; i++) {
    j = (j + S[i] + K[i]) & 255;
    [S[i], S[j]] = [S[j], S[i]]; // 交换
  }
  // 加密
  let i = 0;
  j = 0; // 重用前面声明的j变量
  for (let pos = 0; pos < data.length; pos++) {
    i = (i + 1) & 255;
    j = (j + S[i]) & 255;
    [S[i], S[j]] = [S[j], S[i]]; // 交换
    const t = S[(S[i] + S[j]) & 255];
    output[pos] = data[pos] ^ t;
  } 
  return output;
}