module Gem::Security

def self.get_public_key(key)
  # Ruby 3.0 (Ruby/OpenSSL 2.2) or later
  return OpenSSL::PKey.read(key.public_to_der) if key.respond_to?(:public_to_der)
  return key.public_key unless key.is_a?(OpenSSL::PKey::EC)
  ec_key = OpenSSL::PKey::EC.new(key.group.curve_name)
  ec_key.public_key = key.public_key
  ec_key
end