node-authenticator.js/authenticator.js

72 rindas
2.1 KiB
JavaScript

'use strict';
var crypto = require('crypto');
var b32 = require('thirty-two');
// Generate a key
function generateOtpKey() {
// 20 cryptographically random binary bytes (160-bit key)
var key = crypto.randomBytes(20);
return key;
}
// Text-encode the key as base32 (in the style of Google Authenticator - same as Facebook, Microsoft, etc)
function encodeGoogleAuthKey(bin) {
// 32 ascii characters without trailing '='s
var base32 = b32.encode(bin).toString('utf8').replace(/=/g, '');
// lowercase with a space every 4 characters
var key = base32.toLowerCase().replace(/(\w{4})/g, "$1 ").trim();
return key;
}
function generateGoogleAuthKey() {
return encodeGoogleAuthKey(generateOtpKey());
}
// Binary-decode the key from base32 (Google Authenticator, FB, M$, etc)
function decodeGoogleAuthKey(key) {
// decode base32 google auth key to binary
var unformatted = key.replace(/\W+/g, '').toUpperCase();
var bin = b32.decode(unformatted);
return bin;
}
// Generate a Google Auth Token
function generateGoogleAuthToken(key) {
var bin = decodeGoogleAuthKey(key);
var notp = require('notp');
return notp.totp.gen(bin);
}
// Verify a Google Auth Token
function verifyGoogleAuthToken(key, token) {
var bin = decodeGoogleAuthKey(key);
var notp = require('notp');
token = token.replace(/\W+/g, '');
// window is +/- 1 period of 30 seconds
return notp.totp.verify(token, bin, { window: 1, time: 30 });
}
module.exports.generateKey = generateGoogleAuthKey;
module.exports.generateToken = generateGoogleAuthToken;
module.exports.verifyToken = verifyGoogleAuthToken;
module.exports.generateTotpUri = function (secret, accountName, issuer, algo, digits, period) {
// Full OTPAUTH URI spec as explained at
// https://github.com/google/google-authenticator/wiki/Key-Uri-Format
return 'otpauth://totp/'
+ encodeURI(issuer || '') + ':' + encodeURI(accountName || '')
+ '?secret=' + secret.replace(/[\s\.\_\-]+/g, '').toUpperCase()
+ '&issuer=' + encodeURIComponent(issuer || '')
+ '&algorithm=' + (algo || 'SHA1')
+ '&digits=' + (digits || 6)
+ '&period=' + (period || 30)
;
};