某数美验证码逆向分析

发布于：2023-05-22 ⋅ 阅读:(196) ⋅ 点赞:(0)

某数美验证码分析

某数美接口更新了captchaUuid的算法，下面是算法的实现

function generateTimeFormat() {
    let date = new Date(),
        fn = function (arg1) {
            return +arg1 < 10 ? '0' + arg1 : arg1.toString();
        };
    return ((date.getFullYear().toString() + fn(date.getMonth() + 1)) + fn(date.getDate()) + fn(date.getHours()) + fn(date.getMinutes())) + fn(date.getSeconds())
}

function getCaptchaUuid() {
    let _0x3999d4 = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';
    let _0x44acc9 = 48;
    let _0x2931d8 = '';
    for (let _0xfa = 0; _0xfa < 18; _0xfa++) {
        _0x2931d8 += _0x3999d4.charAt(Math.floor(Math.random() * _0x44acc9));
    }
    return generateTimeFormat() + _0x2931d8;
}