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https://greasyfork.org/zh-CN/scripts/502291 脚本使用
이 스크립트는 직접 설치해서 쓰는 게 아닙니다. 다른 스크립트가 메타 명령 // @require https://update.greasyfork.org/scripts/511697/1471164/TOTP%20Generator.js(으)로 포함하여 쓰는 라이브러리입니다.
// ==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 <china.qinwuyuan@gmail.com>
// @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
}