class JWT::Decode

def set_key
  @key = find_key(&@keyfinder) if @keyfinder
  if @options[:jwks]
    @key = ::JWT::JWK::KeyFinder.new(
      jwks: @options[:jwks],
      allow_nil_kid: @options[:allow_nil_kid],
      key_fields: @options[:key_fields]
    ).call(token)
  end
  return unless (x5c_options = @options[:x5c])
  @key = X5cKeyFinder.new(x5c_options[:root_certificates], x5c_options[:crls]).from(token.header['x5c'])
end