class JSON::JWK

def initialize(params = {}, ex_params = {})
  case params
  when OpenSSL::PKey::RSA, OpenSSL::PKey::EC
    super params.to_jwk(ex_params)
  when OpenSSL::PKey::PKey
    raise UnknownAlgorithm.new('Unknown Key Type')
  when String
    super(
      k: params,
      kty: :oct
    )
    merge! ex_params
  else
    super params
    merge! ex_params
  end
  calculate_default_kid if self[:kid].blank?
end