module Net::SSH::Authentication::ED25519Loader

def self.dependenciesRequiredForED25519
  result = "net-ssh requires the following gems for ed25519 support:\n"
  result << " * ed25519 (>= 1.2, < 2.0)\n"
  result << " * bcrypt_pbkdf (>= 1.0, < 2.0)\n" unless RUBY_PLATFORM == "java"
  result << "See https://github.com/net-ssh/net-ssh/issues/565 for more information\n"
end

def self.raiseUnlessLoaded(message)
  description = ERROR.is_a?(LoadError) ? dependenciesRequiredForED25519 : ''
  description << "#{ERROR.class} : \"#{ERROR.message}\"\n" if ERROR
  raise NotImplementedError, "#{message}\n#{description}" unless LOADED
end