JWK set settings for an Authlete service

Preface

This article explains how to register a JWK set for an Authlete service.
Preparing a JWK set

First, this article assumes that you have prepared a JWK set in some way. The following example illustrates usage of mkjwk.org service to generate an ES256 key pair, and parameters specified for it.

• Key Type: EC (Elliptic Curve)
• Curve: P-256
• Key Use: Signing
• Algorithm: ES256
• Key ID: 1

Registering the JWK set via Service Owner Console

Copy the generated content in the “Public and Private Keypair Set” section, paste it to the service’s “JWK Set Content” section in “JWK Set” tab and click “Update” button.

Now the JWK set has been registered in the service.

Registering the JWK set via Authlete API

You can use Authlete’s service management APIs to register the JWK set instead of using the Web console described above. The following example illustrates how to make a request to /service/update API to specify the JWK set as a value of “jwks” key.

1. Get configuration data about the target service

Use /service/get API to retrieve the configuration data of the service.

curl -s {Authlete API}/service/get/{Service API Key} \
   -u {Service Owner API Key}:{Service Owner API Secret} \
   -H 'Content-type: application/json' \
   > service.json

2. Add a new JWK set to the data

Add the following key/value as a JWK set to the JSON formatted configuration data retrieved above and save as updated-service.json.

{
  "jwks": {
    "keys": [
      {
        "kty": "EC",
        "d": "eb4BggIO87SUjzP1M56MeXj0NQajWBwpwiDq8yoL5n4",
        "use": "sig",
        "crv": "P-256",
        "kid": "2019-07-25_02",
        "x": "f8a6jovcRTNLDWi3_c62YcW_3ZN-GH1RkiVOZgSgIYI",
        "y": "EB3R8W12a3tgZfNer1RP0DizT3qpRybGw_krfsE0JzY",
        "alg": "ES256"
      }
    ]
  }
}

If you would like to register multiple JWKs, specify which one of the JWKs for signing. For example, add the following key/value if a JWK identified by key ID “kid”:“2019-07-25_02” is to be used for signing ID tokens. (see Authlete API Reference for details on idTokenSignatureKeyId)

"idTokenSignatureKeyId": "2019-07-25_02"

3. Update the service with the new configuration data

Use /service/update API to put the new configuration data that includes the JWK set.

cat updated-service.json | \
    curl -s -X PUT {Authlete API}/service/update/{Service API Key} \
    -u {Service Owner API Key}:{Service Owner API Secret} \
    -H 'Content-type: application/json' \
    -d @-

The new “jwks” should be included in the output as follows.

[...]
"jwks": "{\"keys\":[
    {
        \"kty\":\"EC\",
        \"d\":\"eb4BggIO87SUjzP1M56MeXj0NQajWBwpwiDq8yoL5n4\",
        \"use\":\"sig\",
        \"crv\":\"P-256\",
        \"kid\":\"2019-07-25_02\",
        \"x\":\"f8a6jovcRTNLDWi3_c62YcW_3ZN-GH1RkiVOZgSgIYI\",
        \"y\":\"EB3R8W12a3tgZfNer1RP0DizT3qpRybGw_krfsE0JzY\",
        \"alg\":\"ES256\"
    }
]}"
[...]