tests/keys/oct_key_512.json

{
  "keys": [
    {
      "kty": "oct",
      "alg": "HS512",
      "k": "vPnfAG10Y09YGh+DQQwQ-n1lye8hfaO1PYdh8qr5oOI5gxKaX1GNBgwtSWsFyt7txFpuMs4kf_3wPWIefC2rQg"
    }
  ]
}