JS 安全防护原理

数组混淆

var bigArr = [‘Date’, ‘getTime’, ‘log’];
console[bigArr[2]](new window[bigArr[0]]()[bigArr[1]]());
console.log( new window.Date().getTime())

var bigArr = [
‘\u65e5’, ‘\u4e00’, ‘\u4e8c’, ‘\u4e09’, ‘\u56db’, ‘\u4e94’,
‘\u516d’, ‘cmVwbGFjZQ==’, ‘Z2V0TW9udGg=’, ‘dG9TdHJpbmc=’,
‘Z2V0RGF0ZQ==’, ‘MA==’, “”[‘constructor’][‘fromCharCode’]
];
Date.prototype.\u0066\u006f\u0072\u006d\u0061\u0074 = function(formatStr) {
var \u0073\u0074\u0072 = \u0066\u006f\u0072\u006d\u0061\u0074\u0053\u0074\u0072;
var Week = [bigArr[0], bigArr[1], bigArr[2], bigArr[3], bigArr[4], bigArr[5], bigArr[6]];
eval(String.fromCharCode(115, 116, 114, 32, 61, 32, 115, 116, 114, 91, 39, 114, 101, 112, 108, 97, 99, 101, 39, 93, 40, 47, 121, 121, 121, 121, 124, 89, 89, 89, 89, 47, 44, 32, 116, 104, 105, 115, 91, 39, 103, 101, 116, 70, 117, 108, 108, 89, 101, 97, 114, 39, 93, 40, 41, 41, 59));
str = str[atob(bigArr[7])](/MM/, (this[atob(bigArr[8])]() + 1) > 9 ? (this[atob(bigArr[8])]() + 1)[atob(bigArr[9])]() : atob(bigArr[11]) + (this[atob(bigArr[8])]() + 1));
str = str[atob(bigArr[7])](/dd|DD/, this[atob(bigArr[10])]() > 9 ? this[atob(bigArr[10])]()[atob(bigArr[9])]() : atob(bigArr[11]) + this[atob(bigArr[10])]());
return str;
}
console.log( new \u0077\u0069\u006e\u0064\u006f\u0077[‘\u0044\u0061\u0074\u0065’]()[bigArr[12](102, 111, 114, 109, 97, 116)](‘\x79\x79\x79\x79\x2d\x4d\x4d\x2d\x64\x64’) );

数组乱序

var bigArr = [
‘\u65e5’, ‘\u4e00’, ‘\u4e8c’, ‘\u4e09’, ‘\u56db’, ‘\u4e94’,
‘\u516d’, ‘cmVwbGFjZQ==’, ‘Z2V0TW9udGg=’, ‘dG9TdHJpbmc=’,
‘Z2V0RGF0ZQ==’, ‘MA==’, “”[‘constructor’][‘fromCharCode’]
];
(function(arr, num){
var shuffer = function(nums){
while(–nums){
arr.unshift(arr.pop());
}
};
shuffer(++num);
}(bigArr, 0x20));
console.log( bigArr );

var bigArr = [
‘cmVwbGFjZQ==’, ‘Z2V0TW9udGg=’, ‘dG9TdHJpbmc=’, ‘Z2V0RGF0ZQ==’,
‘MA==’, “”[‘constructor’][‘fromCharCode’], ‘\u65e5’, ‘\u4e00’,
‘\u4e8c’, ‘\u4e09’, ‘\u56db’, ‘\u4e94’, ‘\u516d’
];
(function(arr, num){
var shuffer = function(nums){
while(–nums){
arr[‘push’](arr[‘shift’]());
}
};
shuffer(++num);
}(bigArr, 0x20));
Date.prototype.\u0066\u006f\u0072\u006d\u0061\u0074 = function(formatStr) {
var \u0073\u0074\u0072 = \u0066\u006f\u0072\u006d\u0061\u0074\u0053\u0074\u0072;
var Week = [bigArr[0], bigArr[1], bigArr[2], bigArr[3], bigArr[4], bigArr[5], bigArr[6]];
eval(String.fromCharCode(115, 116, 114, 32, 61, 32, 115, 116, 114, 91, 39, 114, 101, 112, 108, 97, 99, 101, 39, 93, 40, 47, 121, 121, 121, 121, 124, 89, 89, 89, 89, 47, 44, 32, 116, 104, 105, 115, 91, 39, 103, 101, 116, 70, 117, 108, 108, 89, 101, 97, 114, 39, 93, 40, 41, 41, 59));
str = str[atob(bigArr[7])](/MM/, (this[atob(bigArr[8])]() + 1) > 9 ? (this[atob(bigArr[8])]() + 1)[atob(bigArr[9])]() : atob(bigArr[11]) + (this[atob(bigArr[8])]() + 1));
str = str[atob(bigArr[7])](/dd|DD/, this[atob(bigArr[10])]() > 9 ? this[atob(bigArr[10])]()[atob(bigArr[9])]() : atob(bigArr[11]) + this[atob(bigArr[10])]());
return str;
}
console.log( new \u0077\u0069\u006e\u0064\u006f\u0077[‘\u0044\u0061\u0074\u0065’]()[bigArr[12](102, 111, 114, 109, 97, 116)](‘\x79\x79\x79\x79\x2d\x4d\x4d\x2d\x64\x64’) );

花指令

function _0x20ab1fxe2(a, b){
return a + b;
}
function _0x20ab1fxe1(a, b){
return _0x20ab1fxe2(a, b);
}
function _0x20ab1fxe3(a, b){
return b;
}
function _0x20ab1fxe4(a, b){
return _0x20ab1fxe3(a, b);
}
_0x20ab1fxe4(‘0’, _0x20ab1fxe1(new Date().getMonth(), 1));

jsfuck

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function anonymous(
) {
alert(1)
}()