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