@aegisjsproject/otp

An OTP library written using the crypto API

---

• Code of Conduct
• Contributing

Features

• Implements RFC 6238 for TOTP generation and verification.
• Uses the standard Web Crypto API for secure HMAC operations.
• Supports SHA-1, SHA-256, and SHA-512 algorithms.
• Provides Base32 encoding/decoding (RFC 4648 compatible).
• Generates and parses otpauth://totp/ URIs for easy provisioning with authenticator apps.
• Cryptographically secure secret generation.
• Configurable token length, time period, and time skew tolerance.
• Pure ES Module, no external runtime dependencies for core crypto.

Installation

Using npm (for Node.js, Bundlers)

Install the package using your preferred package manager:

# Using npm
npm install @aegisjsproject/otp

# Using yarn
yarn add @aegisjsproject/otp

# Using pnpm
pnpm add @aegisjsproject/otp

# Using Git submodules
git submodule add https://github.com/Aegisjsproject/otp.git path/to/destination

Using a CDN with Importmap

<script type="importmap">
  {
    "imports": {
      "@aegisjsproject/otp": "https://unpkg.com/@aegisjsproject/otp[@vx.y.z]/otp.min.js",
      "@aegisjsproject/otp/": "https://unpkg.com/@aegisjsproject/otp[@vx.y.z]/"
    }
  }
</script>

Usage Example

import {
    generateSecret,
    secretToKey,
    createOTPAuthURI,
    generateTOTP,
    verifyTOTP,
    parseOTPAuthURI,
    // other exports if needed...
} from '@aegisjsproject/otp';

// Generate the random bytes
const secret = generateSecret();

// Create a secret key from those random bytes
const key = await secretToKey(secret);

// Generate an `otpauth:` URI to QR encode (QR encoding not provided)
const uri = createOTPAuthURI({ label: 'Acme:[email protected]', issuer: 'Acme', secret });

// Verify a user-provided TOTP code
const valid = await verifyTOTP(totpCode, key);