module Aws::CloudFront::Signer

def private_key(options)
  if options[:private_key]
    options[:private_key]
  elsif options[:private_key_path]
    File.open(options[:private_key_path], 'rb') { |f| f.read }
  else
    msg = ":private_key or :private_key_path should be provided"
    raise ArgumentError, msg
  end
end