express-pbkdf2-api-key-auth

Express middleware for PBKDF2 (Password-Based Key Derivation Function 2) API key authentication. Zero external dependencies (uses Node.js crypto). Compatible with MooseStack token format.

Installation

npm install @514labs/express-pbkdf2-api-key-auth

Generating API Keys

Use the CLI to generate an API key pair:

npx generate-api-key

Output:

API Key Hash (store server-side):
1ee1xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxf64b

Bearer Token (client sends in header; Authorization: Bearer ...):
3cb3xxxxxxxxxxxxxxxxxxxxxxxx0dad.1f67xxxxxxxxxxxxxxxxxxxxxxxx6f33

Or programmatically:

import { generateApiKey } from "@514labs/express-pbkdf2-api-key-auth";

const { bearerToken, apiKeyHash } = generateApiKey();

Usage

import express from "express";
import { createAuthMiddleware } from "@514labs/express-pbkdf2-api-key-auth";

const authMiddleware = createAuthMiddleware((req) => {
  return process.env.API_KEY_HASH;
});

const app = express();
app.use(authMiddleware);

app.get("/api/protected", (req, res) => {
  res.json({ message: "Authenticated!" });
});

app.listen(3000);

Clients authenticate with:

Authorization: Bearer {token_hex}.{salt_hex}

Token Format

The token format is compatible with MooseStack's moose generate hash-token command, and can be used in any Express project:

• Token: 16 random bytes (32-char hex string)
• Salt: 16 random bytes (32-char hex string)
• Hash: PBKDF2-HMAC-SHA256, 1000 iterations, 20-byte output
• Constant-time comparison (timing-attack safe)

API

createAuthMiddleware(getExpectedHash)

Creates an Express middleware for authentication.

Parameters:

• getExpectedHash(req) - Function that returns the expected hash for the request, or null if no key is configured

Returns: Express middleware function

Responses:

• 401 - Missing/invalid Authorization header, no API key configured, or invalid token
• Calls next() on successful authentication

generateApiKey()

Generates a new API key pair.

Returns: { bearerToken: string, apiKeyHash: string }

Made by

The team at Fiveonefour labs, the maintainers of MooseStack.