class JSON::JWS

def verify!(public_key_or_secret, algorithms = nil)
  if alg&.to_sym == :none
    raise UnexpectedAlgorithm if public_key_or_secret
    signature == '' or raise VerificationFailed
  elsif algorithms.blank? || Array(algorithms).include?(alg&.to_sym)
    public_key_or_secret && valid?(public_key_or_secret) or
    raise VerificationFailed
  else
    raise UnexpectedAlgorithm.new('Unexpected alg header')
  end
end