@proton/ccxt/js/src/base/functions/totp.js

A JavaScript / TypeScript / Python / C# / PHP cryptocurrency trading library with support for 130+ exchanges

// ----------------------------------------------------------------------------

// PLEASE DO NOT EDIT THIS FILE, IT IS GENERATED AND WILL BE OVERWRITTEN:
// https://github.com/ccxt/ccxt/blob/master/CONTRIBUTING.md#how-to-contribute-code
// EDIT THE CORRESPONDENT .ts FILE INSTEAD

import { base16, base32 } from '../../static_dependencies/scure-base/index.js';
import { sha1 } from '../../static_dependencies/noble-hashes/sha1.js';
import { hmac } from './crypto.js';
function totp(secret) {
    const dec2hex = (s) => ((s < 15.5 ? '0' : '') + Math.round(s).toString(16));
    const hex2dec = (s) => parseInt(s, 16);
    const leftpad = (s, p) => (p + s).slice(-p.length); // both s and p are short strings
    secret = secret.replace(' ', ''); // support 2fa-secrets with spaces like "4TDV WOGO" → "4TDVWOGO"
    const epoch = Math.round(new Date().getTime() / 1000.0);
    const time = leftpad(dec2hex(Math.floor(epoch / 30)), '0000000000000000');
    const hmacRes = hmac(base16.decode(time), base32.decode(secret), sha1, 'hex');
    const offset = hex2dec(hmacRes.substring(hmacRes.length - 1));
    // eslint-disable-next-line
    let otp = (hex2dec(hmacRes.substr(offset * 2, 8)) & hex2dec('7fffffff')) + '';
    return otp.substring(otp.length - 6, otp.length);
}
;
export { totp };
export default totp;