OTPAuth

One Time Password (HOTP/TOTP) library for Node.js and browser.

Installation

Install the module via npm.

npm install otpauth

Usage

Node.js

const OTPAuth = require('otpauth');

let totp = new OTPAuth.TOTP({
    issuer: 'ACME',
    label: 'AzureDiamond',
    algorithm: 'SHA1',
    digits: 6,
    period: 30,
    secret: OTPAuth.Secret.fromB32('NB2W45DFOIZA')
});

// Generate TOTP token.
let token = totp.generate();

// Validate TOTP token.
let delta = totp.validate({
    token: token,
    window: 10
});

// Convert to Google Authenticator key URI:
//   otpauth://totp/ACME:AzureDiamond?issuer=ACME&secret=NB2W45DFOIZA&algorithm=SHA1&digits=6&period=30
let uri = totp.toString();

Browser

<script src="otpauth.min.js"></script>
<script>
    // Same as above...
</script>

Supported hashing algorithms

In Node.js, the same algorithms as Crypto.createHmac function are supported, since it is used internally. In browsers, the SHA1, SHA256 and SHA512 algorithms are supported by using the Stanford Javascript Crypto Library.

Documentation

See the documentation page.