Gem::Package#add_checksums

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/package.rb, line 282
def add_checksums(tar)
  Gem.load_yaml

  checksums_by_algorithm = Hash.new {|h, algorithm| h[algorithm] = {} }

  @checksums.each do |name, digests|
    digests.each do |algorithm, digest|
      checksums_by_algorithm[algorithm][name] = digest.hexdigest
    end
  end

  tar.add_file_signed "checksums.yaml.gz", 0o444, @signer do |io|
    gzip_to io do |gz_io|
      if Gem.use_psych?
        Psych.dump checksums_by_algorithm, gz_io
      else
        gz_io.write Gem::YAMLSerializer.dump(checksums_by_algorithm)
      end
    end
  end
end