jwks-ec

A library to retrieve EC signing keys from a JWKS (JSON Web Key Set) endpoint.

npm install --save jwks-ec

Usage

You'll provide the client with the JWKS endpoint which exposes your signing keys. Using the getSigningKey you can then get the signing key that matches a specific kid.

const jwksClient = require('jwks-ec');

const client = jwksClient({
  strictSsl: true, // Default value
  jwksUri: 'https://sandrino.auth0.com/.well-known/jwks.json',
  requestHeaders: {}, // Optional
  requestAgentOptions: {} // Optional
});

const kid = 'RkI5MjI5OUY5ODc1N0Q4QzM0OUYzNkVGMTJDOUEzQkFCOTU3NjE2Rg';
client.getSigningKey(kid, (err, key) => {
  const signingKey = key.publicKey || key.privateKey;

  // Now I can use this to configure my Express or Hapi middleware
});

Caching

In order to prevent a call to be made each time a signing key needs to be retrieved you can also configure a cache as follows. If a signing key matching the kid is found, this will be cached and the next time this kid is requested the signing key will be served from the cache instead of calling back to the JWKS endpoint.

const jwksClient = require('jwks-ec');

const client = jwksClient({
  cache: true,
  cacheMaxEntries: 5, // Default value
  cacheMaxAge: ms('10h'), // Default value
  jwksUri: 'https://sandrino.auth0.com/.well-known/jwks.json'
});

const kid = 'RkI5MjI5OUY5ODc1N0Q4QzM0OUYzNkVGMTJDOUEzQkFCOTU3NjE2Rg';
client.getSigningKey(kid, (err, key) => {
  const signingKey = key.publicKey || key.privateKey;

  // Now I can use this to configure my Express or Hapi middleware
});

Using AgentOptions for TLS/SSL Configuration

The requestAgentOptions property can be used to configure SSL/TLS options. An example use case is providing a trusted private (i.e. enterprise/corporate) root certificate authority to establish TLS communication with the jwks_uri.

const jwksClient = require("jwks-ec");
const client = jwksClient({
  strictSsl: true, // Default value
  jwksUri: 'https://my-enterprise-id-provider/.well-known/jwks.json',
  requestHeaders: {}, // Optional
  requestAgentOptions: {
    ca: fs.readFileSync(caFile)
  }
});

For more information, see the NodeJS request library agentOptions documentation.

Running Tests

npm run test

Showing Trace Logs

To show trace logs you can set the following environment variable:

DEBUG=jwks

Output:

jwks Retrieving keys from http://my-authz-server/.well-known/jwks.json +5ms
jwks Keys: +8ms [ { alg: 'ES256',
  kty: 'RSA',
  use: 'sig',
  x5c: [ 'pk1' ],
  kid: 'ABC' },
{ alg: 'RS256', kty: 'RSA', use: 'sig', x5c: [], kid: '123' } ]

License

This project is licensed under the MIT license. See the LICENSE file for more info.