class Gem::Commands::CertCommand

def sign cert_file
  cert = File.read cert_file
  cert = OpenSSL::X509::Certificate.new cert
  permissions = File.stat(cert_file).mode & 0777
  issuer_cert = options[:issuer_cert]
  issuer_key = options[:key]
  cert = Gem::Security.sign cert, issuer_key, issuer_cert
  Gem::Security.write cert, cert_file, permissions
end