setup_signer

# File lib/rubygems/package.rb, line 542
  def setup_signer(signer_options: {})
    passphrase = ENV['GEM_PRIVATE_KEY_PASSPHRASE']
    if @spec.signing_key
      @signer =
        Gem::Security::Signer.new(
          @spec.signing_key,
          @spec.cert_chain,
          passphrase,
          signer_options
        )

      @spec.signing_key = nil
      @spec.cert_chain = @signer.cert_chain.map { |cert| cert.to_s }
    else
      @signer = Gem::Security::Signer.new nil, nil, passphrase
      @spec.cert_chain = @signer.cert_chain.map { |cert| cert.to_pem } if
        @signer.cert_chain
    end
  end