TOTP Generator

https://greasyfork.org/zh-CN/scripts/502291 脚本使用

Цей скрипт не слід встановлювати безпосередньо. Це - бібліотека для інших скриптів для включення в мета директиву // @require https://update.greasyfork.org/scripts/511697/1471164/TOTP%20Generator.js

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(У мене вже є менеджер скриптів, дайте мені встановити його!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         TOTP Generator
// @namespace   https://github.com/ChinaGodMan/UserScripts
// @version     2024/10/07
// @description https://greasyfork.org/zh-CN/scripts/502291 脚本使用
// @author      人民的勤务员 <[email protected]>
// @license     MIT
// @supportURL  https://github.com/ChinaGodMan/UserScripts/issues
// @homepageURL https://github.com/ChinaGodMan/UserScripts
// ==/UserScript==
function base32Decode(str) {
    const base32chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'
    let buffer = ''
    for (let i = 0; i < str.length; i++) {
        const value = base32chars.indexOf(str[i])
        if (value < 0) continue
        buffer += value.toString(2).padStart(5, '0')
    }
    const bytes = []
    for (let i = 0; i < buffer.length; i += 8) {
        bytes.push(parseInt(buffer.substr(i, 8), 2))
    }
    return new Uint8Array(bytes)
}
async function hmacSHA1(key, message) {
    const crypto = window.crypto || window.msCrypto
    const keyBuffer = await crypto.subtle.importKey(
        "raw",
        key,
        { name: "HMAC", hash: { name: "SHA-1" } },
        false,
        ["sign"]
    )
    const signature = await crypto.subtle.sign("HMAC", keyBuffer, message)
    return new Uint8Array(signature)
}
async function generateHOTP(key, counter, digits = 6) {
    const counterBuffer = new ArrayBuffer(8)
    const view = new DataView(counterBuffer)
    view.setBigInt64(0, BigInt(counter), false) // Big-endian
    const hmac = await hmacSHA1(key, new Uint8Array(counterBuffer))
    const offset = hmac[hmac.length - 1] & 0x0F
    let dynamicPassword =
        (hmac[offset] & 0x7F) << 24 |
        (hmac[offset + 1] & 0xFF) << 16 |
        (hmac[offset + 2] & 0xFF) << 8 |
        (hmac[offset + 3] & 0xFF)
    dynamicPassword = dynamicPassword % Math.pow(10, digits)
    return dynamicPassword.toString().padStart(digits, '0')
}
function getCounter(timeStep = 30) {
    const currentTime = Math.floor(Date.now() / 1000)
    return Math.floor(currentTime / timeStep)
}
async function generateTOTP(secret, timeStep = 30, digits = 6) {
    const key = base32Decode(secret)
    const counter = getCounter(timeStep)
    const totp = await generateHOTP(key, counter, digits)
    return totp
}