module JWT::Algos::Eddsa

def sign(to_sign)
  algorithm, msg, key = to_sign.values
  if key.class != RbNaCl::Signatures::Ed25519::SigningKey
    raise EncodeError, "Key given is a #{key.class} but has to be an RbNaCl::Signatures::Ed25519::SigningKey"
  end
  unless SUPPORTED.map(&:downcase).map(&:to_sym).include?(algorithm.downcase.to_sym)
    raise IncorrectAlgorithm, "payload algorithm is #{algorithm} but #{key.primitive} signing key was provided"
  end
  key.sign(msg)
end