class JWT::Decode

def set_key
  @key = find_key(&@keyfinder) if @keyfinder
  @key = ::JWT::JWK::KeyFinder.new(jwks: @options[:jwks]).key_for(header['kid']) if @options[:jwks]
  if (x5c_options = @options[:x5c])
    @key = X5cKeyFinder.new(x5c_options[:root_certificates], x5c_options[:crls]).from(header['x5c'])
  end
end