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

def verify(to_verify)
  algorithm, public_key, signing_input, signature = to_verify.values
  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
  raise DecodeError, "key given is a #{public_key.class} but has to be a RbNaCl::Signatures::Ed25519::VerifyKey" if public_key.class != RbNaCl::Signatures::Ed25519::VerifyKey
  public_key.verify(signature, signing_input)
rescue RbNaCl::CryptoError
  false
end